Use https instead of ssh for schemastore authentication

## Summary

This PR fixes the bug where the generated fix for `EM*` rules would
replace a
triple-quoted (f-)string with a single-quoted (f-)string. This changes
the
semantic of the string in case it contains a single-quoted string
literal. This
is especially evident with f-strings where the expression could contain
another
string within it. For example,

```python
f"""normal {"another"} normal"""
```

## Test Plan

Add test case for triple-quoted string and update the snapshots.

fixes: #6988
fixes: #7736

.cargo/config.toml

@@ -1,2 +1,37 @@
 [alias]
 dev = "run --package ruff_dev --bin ruff_dev"
+benchmark = "bench -p ruff_benchmark --bench linter --bench formatter --"
+
+[target.'cfg(all())']
+rustflags = [
+  # CLIPPY LINT SETTINGS
+  # This is a workaround to configure lints for the entire workspace, pending the ability to configure this via TOML.
+  # See: `https://github.com/rust-lang/cargo/issues/5034`
+  #      `https://github.com/EmbarkStudios/rust-ecosystem/issues/22#issuecomment-947011395`
+  "-Dunsafe_code",
+  "-Wclippy::pedantic",
+  # Allowed pedantic lints
+  "-Wclippy::char_lit_as_u8",
+  "-Aclippy::collapsible_else_if",
+  "-Aclippy::collapsible_if",
+  "-Aclippy::implicit_hasher",
+  "-Aclippy::match_same_arms",
+  "-Aclippy::missing_errors_doc",
+  "-Aclippy::missing_panics_doc",
+  "-Aclippy::module_name_repetitions",
+  "-Aclippy::must_use_candidate",
+  "-Aclippy::similar_names",
+  "-Aclippy::too_many_lines",
+  # Disallowed restriction lints
+  "-Wclippy::print_stdout",
+  "-Wclippy::print_stderr",
+  "-Wclippy::dbg_macro",
+  "-Wclippy::empty_drop",
+  "-Wclippy::empty_structs_with_brackets",
+  "-Wclippy::exit",
+  "-Wclippy::get_unwrap",
+  "-Wclippy::rc_buffer",
+  "-Wclippy::rc_mutex",
+  "-Wclippy::rest_pat_in_fully_bound_structs",
+  "-Wunreachable_pub"
+]

.devcontainer/devcontainer.json

@@ -0,0 +1,46 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/rust
+{
+	"name": "Ruff",
+	"image": "mcr.microsoft.com/devcontainers/rust:0-1-bullseye",
+	"mounts": [
+		{
+			"source": "devcontainer-cargo-cache-${devcontainerId}",
+			"target": "/usr/local/cargo",
+			"type": "volume"
+		}
+	],
+	"customizations": {
+		"codespaces": {
+			"openFiles": [
+				"CONTRIBUTING.md"
+			]
+		},
+		"vscode": {
+			"extensions": [
+				"ms-python.python",
+				"rust-lang.rust-analyzer",
+				"serayuzgur.crates",
+				"tamasfe.even-better-toml",
+				"Swellaby.vscode-rust-test-adapter",
+				"charliermarsh.ruff"
+			],
+			"settings": {
+				"rust-analyzer.updates.askBeforeDownload": false
+			}
+		}
+	},
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers/features/python": {
+			"installTools": false
+		}
+	},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	"postCreateCommand": ".devcontainer/post-create.sh"
+	// Configure tool-specific properties.
+	// "customizations": {},
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.devcontainer/post-create.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+rustup default < rust-toolchain
+rustup component add clippy rustfmt
+cargo install cargo-insta
+cargo fetch
+
+pip install maturin pre-commit

.editorconfig

@@ -10,5 +10,11 @@ indent_style = space
 insert_final_newline = true
 indent_size = 2
 
-[*.{rs,py}]
+[*.{rs,py,pyi}]
 indent_size = 4
+
+[*.snap]
+trim_trailing_whitespace = false
+
+[*.md]
+max_line_length = 100

.gitattributes

@@ -0,0 +1,7 @@
+* text=auto eol=lf
+
+crates/ruff_linter/resources/test/fixtures/isort/line_ending_crlf.py text eol=crlf
+crates/ruff_linter/resources/test/fixtures/pycodestyle/W605_1.py text eol=crlf
+
+ruff.schema.json linguist-generated=true text=auto eol=lf
+*.md.snap linguist-language=Markdown

.github/CODEOWNERS

@@ -0,0 +1,9 @@
+# GitHub code owners file. For more info: https://help.github.com/articles/about-codeowners/
+#
+# - Comment lines begin with `#` character.
+# - Each line is a file pattern followed by one or more owners.
+# - The '*' pattern is global owners.
+# - Order is important. The last matching pattern has the most precedence.
+
+# Jupyter
+/crates/ruff_linter/src/jupyter/ @dhruvmanila

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,10 @@
+<!--
+Thank you for taking the time to report an issue! We're glad to have you involved with Ruff.
+
+If you're filing a bug report, please consider including the following information:
+
+* A minimal code snippet that reproduces the bug.
+* The command you invoked (e.g., `ruff /path/to/file.py --fix`), ideally including the `--isolated` flag.
+* The current Ruff settings (any relevant sections from your `pyproject.toml`).
+* The current Ruff version (`ruff --version`).
+-->

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+<!--
+Thank you for contributing to Ruff! To help us out with reviewing, please consider the following:
+
+- Does this pull request include a summary of the change? (See below.)
+- Does this pull request include a descriptive title?
+- Does this pull request include references to any relevant issues?
+-->
+
+## Summary
+
+<!-- What's the purpose of the change? What does it do, and why? -->
+
+## Test Plan
+
+<!-- How was it tested? -->

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels: ["internal"]
+
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels: ["internal"]

.github/workflows/ci.yaml

@@ -4,134 +4,474 @@ on:
   push:
     branches: [main]
   pull_request:
-    branches: [main]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
 
 env:
   CARGO_INCREMENTAL: 0
   CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
   RUSTUP_MAX_RETRIES: 10
+  PACKAGE_NAME: ruff
+  PYTHON_VERSION: "3.11"
 
 jobs:
-  cargo_build:
-    name: "cargo build"
+  determine_changes:
+    name: "Determine changes"
     runs-on: ubuntu-latest
+    outputs:
+      linter: ${{ steps.changed.outputs.linter_any_changed }}
+      formatter: ${{ steps.changed.outputs.formatter_any_changed }}
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
+      - uses: actions/checkout@v4
         with:
-          profile: minimal
-      - uses: actions/cache@v3
-        env:
-          cache-name: cache-cargo
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-      - run: cargo build --all --release
+          fetch-depth: 0
 
-  cargo_fmt:
+      - uses: tj-actions/changed-files@v40
+        id: changed
+        with:
+          files_yaml: |
+            linter:
+              - Cargo.toml
+              - Cargo.lock
+              - crates/**
+              - "!crates/ruff_python_formatter/**"
+              - "!crates/ruff_formatter/**"
+              - "!crates/ruff_dev/**"
+              - "!crates/ruff_shrinking/**"
+              - scripts/*
+              - .github/workflows/ci.yaml
+
+            formatter:
+              - Cargo.toml
+              - Cargo.lock
+              - crates/ruff_python_formatter/**
+              - crates/ruff_formatter/**
+              - crates/ruff_python_trivia/**
+              - crates/ruff_python_ast/**
+              - crates/ruff_source_file/**
+              - crates/ruff_python_index/**
+              - crates/ruff_text_size/**
+              - crates/ruff_python_parser/**
+              - crates/ruff_dev/**
+              - scripts/*
+              - .github/workflows/ci.yaml
+
+  cargo-fmt:
     name: "cargo fmt"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2022-11-01
-          override: true
-          components: rustfmt
-      - uses: actions/cache@v3
-        env:
-          cache-name: cache-cargo
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup component add rustfmt
       - run: cargo fmt --all --check
 
-  cargo_clippy:
+  cargo-clippy:
     name: "cargo clippy"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2022-11-01
-          override: true
-          components: clippy
-      - uses: actions/cache@v3
-        env:
-          cache-name: cache-cargo
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-      - run: cargo clippy --workspace --all-targets --all-features -- -D warnings -W clippy::pedantic
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: |
+          rustup component add clippy
+          rustup target add wasm32-unknown-unknown
+      - uses: Swatinem/rust-cache@v2
+      - name: "Clippy"
+        run: cargo clippy --workspace --all-targets --all-features -- -D warnings
+      - name: "Clippy (wasm)"
+        run: cargo clippy -p ruff_wasm --target wasm32-unknown-unknown --all-features -- -D warnings
 
-  cargo_test:
-    name: "cargo test"
+  cargo-test-linux:
+    runs-on: ubuntu-latest
+    name: "cargo test (linux)"
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - name: "Install cargo insta"
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-insta
+      - uses: Swatinem/rust-cache@v2
+      - name: "Run tests"
+        run: cargo insta test --all --all-features --unreferenced reject
+      # Check for broken links in the documentation.
+      - run: cargo doc --all --no-deps
+        env:
+          # Setting RUSTDOCFLAGS because `cargo doc --check` isn't yet implemented (https://github.com/rust-lang/cargo/issues/10025).
+          RUSTDOCFLAGS: "-D warnings"
+      - uses: actions/upload-artifact@v3
+        with:
+          name: ruff
+          path: target/debug/ruff
+
+  cargo-test-windows:
+    runs-on: windows-latest
+    name: "cargo test (windows)"
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - name: "Install cargo insta"
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-insta
+      - uses: Swatinem/rust-cache@v2
+      - name: "Run tests"
+        shell: bash
+        # We can't reject unreferenced snapshots on windows because flake8_executable can't run on windows
+        run: cargo insta test --all --all-features
+
+  cargo-test-wasm:
+    runs-on: ubuntu-latest
+    name: "cargo test (wasm)"
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup target add wasm32-unknown-unknown
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: "npm"
+          cache-dependency-path: playground/package-lock.json
+      - uses: jetli/wasm-pack-action@v0.4.0
+      - uses: Swatinem/rust-cache@v2
+      - name: "Run wasm-pack"
+        run: |
+          cd crates/ruff_wasm
+          wasm-pack test --node
+
+  cargo-fuzz:
+    runs-on: ubuntu-latest
+    name: "cargo fuzz"
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "fuzz -> target"
+      - name: "Install cargo-fuzz"
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-fuzz@0.11
+      - run: cargo fuzz build -s none
+
+  scripts:
+    name: "test scripts"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2022-11-01
-          override: true
-      - uses: actions/cache@v3
-        env:
-          cache-name: cache-cargo
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-      - run: cargo test --all
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup component add rustfmt
+      - uses: Swatinem/rust-cache@v2
+      - run: ./scripts/add_rule.py --name DoTheThing --prefix PL --code C0999 --linter pylint
+      - run: cargo check
+      - run: cargo fmt --all --check
+      - run: |
+          ./scripts/add_plugin.py test --url https://pypi.org/project/-test/0.1.0/ --prefix TST
+          ./scripts/add_rule.py --name FirstRule --prefix TST --code 001 --linter test
+      - run: cargo check
+      - run: cargo fmt --all --check
 
-  maturin_build:
-    name: "maturin build"
+  ecosystem:
+    name: "ecosystem"
     runs-on: ubuntu-latest
+    needs:
+      - cargo-test-linux
+      - determine_changes
+    # Only runs on pull requests, since that is the only we way we can find the base version for comparison.
+    # Ecosystem check needs linter and/or formatter changes.
+    if: github.event_name == 'pull_request' && ${{
+      needs.determine_changes.outputs.linter == 'true' ||
+      needs.determine_changes.outputs.formatter == 'true'
+      }}
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: nightly-2022-11-01
-          override: true
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
-      - run: pip install maturin
-      - uses: actions/cache@v3
-        env:
-          cache-name: cache-cargo
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - uses: actions/download-artifact@v3
+        name: Download comparison Ruff binary
+        id: ruff-target
         with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-      - run: maturin build -b bin
+          name: ruff
+          path: target/debug
+
+      - uses: dawidd6/action-download-artifact@v2
+        name: Download baseline Ruff binary
+        with:
+          name: ruff
+          branch: ${{ github.event.pull_request.base.ref }}
+          check_artifacts: true
+
+      - name: Install ruff-ecosystem
+        run: |
+          pip install ./python/ruff-ecosystem
+
+      - name: Run `ruff check` stable ecosystem check
+        if: ${{ needs.determine_changes.outputs.linter == 'true' }}
+        run: |
+          # Make executable, since artifact download doesn't preserve this
+          chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff
+
+          # Set pipefail to avoid hiding errors with tee
+          set -eo pipefail
+
+          ruff-ecosystem check ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown | tee ecosystem-result-check-stable
+
+          cat ecosystem-result-check-stable > $GITHUB_STEP_SUMMARY
+          echo "### Linter (stable)"  > ecosystem-result
+          cat ecosystem-result-check-stable >> ecosystem-result
+          echo "" >> ecosystem-result
+
+      - name: Run `ruff check` preview ecosystem check
+        if: ${{ needs.determine_changes.outputs.linter == 'true' }}
+        run: |
+          # Make executable, since artifact download doesn't preserve this
+          chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff
+
+          # Set pipefail to avoid hiding errors with tee
+          set -eo pipefail
+
+          ruff-ecosystem check ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown --force-preview | tee ecosystem-result-check-preview
+
+          cat ecosystem-result-check-preview > $GITHUB_STEP_SUMMARY
+          echo "### Linter (preview)" >> ecosystem-result
+          cat ecosystem-result-check-preview >> ecosystem-result
+          echo "" >> ecosystem-result
+
+      - name: Run `ruff format` stable ecosystem check
+        if: ${{ needs.determine_changes.outputs.formatter == 'true' }}
+        run: |
+          # Make executable, since artifact download doesn't preserve this
+          chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff
+
+          # Set pipefail to avoid hiding errors with tee
+          set -eo pipefail
+
+          ruff-ecosystem format ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown | tee ecosystem-result-format-stable
+
+          cat ecosystem-result-format-stable > $GITHUB_STEP_SUMMARY
+          echo "### Formatter (stable)" >> ecosystem-result
+          cat ecosystem-result-format-stable >> ecosystem-result
+          echo "" >> ecosystem-result
+
+      - name: Run `ruff format` preview ecosystem check
+        if: ${{ needs.determine_changes.outputs.formatter == 'true' }}
+        run: |
+          # Make executable, since artifact download doesn't preserve this
+          chmod +x ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff
+
+          # Set pipefail to avoid hiding errors with tee
+          set -eo pipefail
+
+          ruff-ecosystem format ./ruff ${{ steps.ruff-target.outputs.download-path }}/ruff --cache ./checkouts --output-format markdown --force-preview | tee ecosystem-result-format-preview
+
+          cat ecosystem-result-format-preview > $GITHUB_STEP_SUMMARY
+          echo "### Formatter (preview)" >> ecosystem-result
+          cat ecosystem-result-format-preview >> ecosystem-result
+          echo "" >> ecosystem-result
+
+      - name: Export pull request number
+        run: |
+          echo ${{ github.event.number }} > pr-number
+
+      - uses: actions/upload-artifact@v3
+        name: Upload PR Number
+        with:
+          name: pr-number
+          path: pr-number
+
+      - uses: actions/upload-artifact@v3
+        name: Upload Results
+        with:
+          name: ecosystem-result
+          path: ecosystem-result
+
+  cargo-udeps:
+    name: "cargo udeps"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install nightly Rust toolchain"
+        # Only pinned to make caching work, update freely
+        run: rustup toolchain install nightly-2023-10-15
+      - uses: Swatinem/rust-cache@v2
+      - name: "Install cargo-udeps"
+        uses: taiki-e/install-action@cargo-udeps
+      - name: "Run cargo-udeps"
+        run: cargo +nightly-2023-10-15 udeps
+
+  python-package:
+    name: "python package"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - uses: Swatinem/rust-cache@v2
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
+        with:
+          args: --out dist
+      - name: "Test wheel"
+        run: |
+          pip install --force-reinstall --find-links dist ${{ env.PACKAGE_NAME }}
+          ruff --help
+          python -m ruff --help
+      - name: "Remove wheels from cache"
+        run: rm -rf target/wheels
+
+  pre-commit:
+    name: "pre-commit"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - uses: Swatinem/rust-cache@v2
+      - name: "Install pre-commit"
+        run: pip install pre-commit
+      - name: "Cache pre-commit"
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}
+      - name: "Run pre-commit"
+        run: |
+          echo '```console' > $GITHUB_STEP_SUMMARY
+          # Enable color output for pre-commit and remove it for the summary
+          SKIP=cargo-fmt,clippy,dev-generate-all pre-commit run --all-files --show-diff-on-failure --color=always | \
+            tee >(sed -E 's/\x1B\[([0-9]{1,2}(;[0-9]{1,2})*)?[mGK]//g' >> $GITHUB_STEP_SUMMARY) >&1
+          exit_code=${PIPESTATUS[0]}
+          echo '```' >> $GITHUB_STEP_SUMMARY
+          exit $exit_code
+
+  docs:
+    name: "mkdocs"
+    runs-on: ubuntu-latest
+    env:
+      MKDOCS_INSIDERS_SSH_KEY_EXISTS: ${{ secrets.MKDOCS_INSIDERS_SSH_KEY != '' }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+      - name: "Add SSH key"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
+        uses: webfactory/ssh-agent@v0.8.0
+        with:
+          ssh-private-key: ${{ secrets.MKDOCS_INSIDERS_SSH_KEY }}
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - uses: Swatinem/rust-cache@v2
+      - name: "Install Insiders dependencies"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
+        run: pip install -r docs/requirements-insiders.txt
+      - name: "Install dependencies"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS != 'true' }}
+        run: pip install -r docs/requirements.txt
+      - name: "Update README File"
+        run: python scripts/transform_readme.py --target mkdocs
+      - name: "Generate docs"
+        run: python scripts/generate_mkdocs.py
+      - name: "Check docs formatting"
+        run: python scripts/check_docs_formatted.py
+      - name: "Build Insiders docs"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
+        run: mkdocs build --strict -f mkdocs.insiders.yml
+      - name: "Build docs"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS != 'true' }}
+        run: mkdocs build --strict -f mkdocs.generated.yml
+
+  check-formatter-instability-and-black-similarity:
+    name: "formatter instabilities and black similarity"
+    runs-on: ubuntu-latest
+    needs: determine_changes
+    if: needs.determine_changes.outputs.formatter == 'true' || github.ref == 'refs/heads/main'
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - name: "Cache rust"
+        uses: Swatinem/rust-cache@v2
+      - name: "Formatter progress"
+        run: scripts/formatter_ecosystem_checks.sh
+      - name: "Github step summary"
+        run: cat target/progress_projects_stats.txt > $GITHUB_STEP_SUMMARY
+      - name: "Remove checkouts from cache"
+        run: rm -r target/progress_projects
+
+  check-ruff-lsp:
+    name: "test ruff-lsp"
+    runs-on: ubuntu-latest
+    needs: cargo-test-linux
+    steps:
+      - uses: extractions/setup-just@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions/checkout@v4
+        name: "Download ruff-lsp source"
+        with:
+          repository: "astral-sh/ruff-lsp"
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - uses: actions/download-artifact@v3
+        name: Download development ruff binary
+        id: ruff-target
+        with:
+          name: ruff
+          path: target/debug
+
+      - name: Install ruff-lsp dependencies
+        run: |
+          just install
+
+      - name: Run ruff-lsp tests
+        run: |
+          # Setup development binary
+          pip uninstall --yes ruff
+          chmod +x ${{ steps.ruff-target.outputs.download-path }}/ruff
+          export PATH=${{ steps.ruff-target.outputs.download-path }}:$PATH
+          ruff version
+
+          just test
+
+  benchmarks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout Branch"
+        uses: actions/checkout@v4
+
+      - name: "Install Rust toolchain"
+        run: rustup show
+
+      - name: "Install codspeed"
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-codspeed
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: "Build benchmarks"
+        run: cargo codspeed build --features codspeed -p ruff_benchmark
+
+      - name: "Run benchmarks"
+        uses: CodSpeedHQ/action@v1
+        with:
+          run: cargo codspeed run
+          token: ${{ secrets.CODSPEED_TOKEN }}

.github/workflows/docs.yaml

@@ -0,0 +1,55 @@
+name: mkdocs
+
+on:
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: "The commit SHA, tag, or branch to publish. Uses the default branch if not specified."
+        default: ""
+        type: string
+  release:
+    types: [published]
+
+jobs:
+  mkdocs:
+    runs-on: ubuntu-latest
+    env:
+      CF_API_TOKEN_EXISTS: ${{ secrets.CF_API_TOKEN != '' }}
+      MKDOCS_INSIDERS_SSH_KEY_EXISTS: ${{ secrets.MKDOCS_INSIDERS_SSH_KEY != '' }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.ref }}
+      - uses: actions/setup-python@v4
+      - name: "Add SSH key"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
+        uses: webfactory/ssh-agent@v0.8.0
+        with:
+          ssh-private-key: ${{ secrets.MKDOCS_INSIDERS_SSH_KEY }}
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - uses: Swatinem/rust-cache@v2
+      - name: "Install Insiders dependencies"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
+        run: pip install -r docs/requirements-insiders.txt
+      - name: "Install dependencies"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS != 'true' }}
+        run: pip install -r docs/requirements.txt
+      - name: "Copy README File"
+        run: |
+          python scripts/transform_readme.py --target mkdocs
+          python scripts/generate_mkdocs.py
+      - name: "Build Insiders docs"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS == 'true' }}
+        run: mkdocs build --strict -f mkdocs.insiders.yml
+      - name: "Build docs"
+        if: ${{ env.MKDOCS_INSIDERS_SSH_KEY_EXISTS != 'true' }}
+        run: mkdocs build --strict -f mkdocs.generated.yml
+      - name: "Deploy to Cloudflare Pages"
+        if: ${{ env.CF_API_TOKEN_EXISTS == 'true' }}
+        uses: cloudflare/wrangler-action@v3.3.2
+        with:
+          apiToken: ${{ secrets.CF_API_TOKEN }}
+          accountId: ${{ secrets.CF_ACCOUNT_ID }}
+          # `github.head_ref` is only set during pull requests and for manual runs or tags we use `main` to deploy to production
+          command: pages deploy site --project-name=astral-docs --branch ${{ github.head_ref || 'main' }} --commit-hash ${GITHUB_SHA}

.github/workflows/flake8-to-ruff.yaml

@@ -9,62 +9,55 @@ concurrency:
 env:
   PACKAGE_NAME: flake8-to-ruff
   CRATE_NAME: flake8_to_ruff
-  PYTHON_VERSION: "3.7" # to build abi3 wheels
+  PYTHON_VERSION: "3.11"
   CARGO_INCREMENTAL: 0
   CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
   RUSTUP_MAX_RETRIES: 10
 
 jobs:
   macos-x86_64:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           architecture: x64
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          default: true
-      - name: Build wheels - x86_64
-        uses: messense/maturin-action@v1
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - name: "Build wheels - x86_64"
+        uses: PyO3/maturin-action@v1
         with:
           target: x86_64
           args: --release --out dist --sdist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - name: Install built wheel - x86_64
+      - name: "Install built wheel - x86_64"
         run: |
           pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
   macos-universal:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           architecture: x64
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - name: "Build wheels - universal2"
+        uses: PyO3/maturin-action@v1
         with:
-          toolchain: stable
-          profile: minimal
-          default: true
-      - name: Build wheels - universal2
-        uses: messense/maturin-action@v1
-        with:
-          args: --release --universal2 --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - name: Install built wheel - universal2
+          args: --release --target universal2-apple-darwin --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+      - name: "Install built wheel - universal2"
         run: |
           pip install dist/${{ env.CRATE_NAME }}-*universal2.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -75,28 +68,24 @@ jobs:
       matrix:
         target: [x64, x86]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           architecture: ${{ matrix.target }}
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          default: true
-      - name: Build wheels
-        uses: messense/maturin-action@v1
+      - name: "Install Rust toolchain"
+        run: rustup show
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.target }}
           args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - name: Install built wheel
+      - name: "Install built wheel"
         shell: bash
         run: |
           python -m pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -107,23 +96,23 @@ jobs:
       matrix:
         target: [x86_64, i686]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           architecture: x64
-      - name: Build wheels
-        uses: messense/maturin-action@v1
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.target }}
           manylinux: auto
           args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - name: Install built wheel
+      - name: "Install built wheel"
         if: matrix.target == 'x86_64'
         run: |
           pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -134,17 +123,17 @@ jobs:
       matrix:
         target: [aarch64, armv7, s390x, ppc64le, ppc64]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-      - name: Build wheels
-        uses: messense/maturin-action@v1
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.target }}
           manylinux: auto
           args: --no-default-features --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - uses: uraimo/run-on-arch-action@v2.0.5
+      - uses: uraimo/run-on-arch-action@v2
         if: matrix.target != 'ppc64'
         name: Install built wheel
         with:
@@ -157,8 +146,8 @@ jobs:
             pip3 install -U pip
           run: |
             pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -171,18 +160,18 @@ jobs:
           - x86_64-unknown-linux-musl
           - i686-unknown-linux-musl
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           architecture: x64
-      - name: Build wheels
-        uses: messense/maturin-action@v1
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.target }}
           manylinux: musllinux_1_2
           args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - name: Install built wheel
+      - name: "Install built wheel"
         if: matrix.target == 'x86_64-unknown-linux-musl'
         uses: addnab/docker-run-action@v3
         with:
@@ -191,8 +180,8 @@ jobs:
           run: |
             apk add py3-pip
             pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links /io/dist/ --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -207,17 +196,17 @@ jobs:
           - target: armv7-unknown-linux-musleabihf
             arch: armv7
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-      - name: Build wheels
-        uses: messense/maturin-action@v1
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.platform.target }}
           manylinux: musllinux_1_2
           args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - uses: uraimo/run-on-arch-action@master
+      - uses: uraimo/run-on-arch-action@v2
         name: Install built wheel
         with:
           arch: ${{ matrix.platform.arch }}
@@ -227,42 +216,8 @@ jobs:
             apk add py3-pip
           run: |
             pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  pypy:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-        target: [x86_64, aarch64]
-        python-version:
-          - "3.7"
-          - "3.8"
-          - "3.9"
-        exclude:
-          - os: macos-latest
-            target: aarch64
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: pypy${{ matrix.python-version }}
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.target }}
-          manylinux: auto
-          args: --release --out dist -i pypy${{ matrix.python-version }} -m ./${{ env.CRATE_NAME }}/Cargo.toml
-      - name: Install built wheel
-        if: matrix.target == 'x86_64'
-        run: |
-          pip install dist/${{ env.CRATE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
         with:
           name: wheels
           path: dist
@@ -278,13 +233,12 @@ jobs:
       - linux-cross
       - musllinux
       - musllinux-cross
-      - pypy
     steps:
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         with:
           name: wheels
       - uses: actions/setup-python@v4
-      - name: Publish to PyPi
+      - name: "Publish to PyPi"
         env:
           TWINE_USERNAME: __token__
           TWINE_PASSWORD: ${{ secrets.FLAKE8_TO_RUFF_TOKEN }}

.github/workflows/playground.yaml

@@ -0,0 +1,48 @@
+name: "[Playground] Release"
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
+  RUSTUP_MAX_RETRIES: 10
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    env:
+      CF_API_TOKEN_EXISTS: ${{ secrets.CF_API_TOKEN != '' }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: "Install Rust toolchain"
+        run: rustup target add wasm32-unknown-unknown
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: "npm"
+          cache-dependency-path: playground/package-lock.json
+      - uses: jetli/wasm-pack-action@v0.4.0
+      - uses: jetli/wasm-bindgen-action@v0.2.0
+      - name: "Run wasm-pack"
+        run: wasm-pack build --target web --out-dir ../../playground/src/pkg crates/ruff_wasm
+      - name: "Install Node dependencies"
+        run: npm ci
+        working-directory: playground
+      - name: "Run TypeScript checks"
+        run: npm run check
+        working-directory: playground
+      - name: "Build JavaScript bundle"
+        run: npm run build
+        working-directory: playground
+      - name: "Deploy to Cloudflare Pages"
+        if: ${{ env.CF_API_TOKEN_EXISTS == 'true' }}
+        uses: cloudflare/wrangler-action@v3.3.2
+        with:
+          apiToken: ${{ secrets.CF_API_TOKEN }}
+          accountId: ${{ secrets.CF_ACCOUNT_ID }}
+          # `github.head_ref` is only set during pull requests and for manual runs or tags we use `main` to deploy to production
+          command: pages deploy playground/dist --project-name=ruff-playground --branch ${{ github.head_ref || 'main' }} --commit-hash ${GITHUB_SHA}

.github/workflows/pr-comment.yaml

@@ -0,0 +1,79 @@
+name: Ecosystem check comment
+
+on:
+  workflow_run:
+    workflows: [CI]
+    types: [completed]
+  workflow_dispatch:
+    inputs:
+      workflow_run_id:
+        description: The ecosystem workflow that triggers the workflow run
+        required: true
+
+permissions:
+  pull-requests: write
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dawidd6/action-download-artifact@v2
+        name: Download pull request number
+        with:
+          name: pr-number
+          run_id: ${{ github.event.workflow_run.id ||  github.event.inputs.workflow_run_id }}
+          if_no_artifact_found: ignore
+
+      - name: Parse pull request number
+        id: pr-number
+        run: |
+          if [[ -f pr-number ]]
+          then
+            echo "pr-number=$(<pr-number)" >> $GITHUB_OUTPUT
+          fi
+
+      - uses: dawidd6/action-download-artifact@v2
+        name: "Download ecosystem results"
+        id: download-ecosystem-result
+        if: steps.pr-number.outputs.pr-number
+        with:
+          name: ecosystem-result
+          workflow: ci.yaml
+          pr: ${{ steps.pr-number.outputs.pr-number }}
+          path: pr/ecosystem
+          workflow_conclusion: completed
+          if_no_artifact_found: ignore
+
+      - name: Generate comment content
+        id: generate-comment
+        if: steps.download-ecosystem-result.outputs.found_artifact == 'true'
+        run: |
+          # Note this identifier is used to find the comment to update on
+          # subsequent runs
+          echo '<!-- generated-comment ecosystem -->' >> comment.txt
+
+          echo '## `ruff-ecosystem` results' >> comment.txt
+          cat pr/ecosystem/ecosystem-result >> comment.txt
+          echo "" >> comment.txt
+
+          echo 'comment<<EOF' >> $GITHUB_OUTPUT
+          cat comment.txt >> $GITHUB_OUTPUT
+          echo 'EOF' >> $GITHUB_OUTPUT
+
+      - name: Find existing comment
+        uses: peter-evans/find-comment@v2
+        if: steps.generate-comment.outcome == 'success'
+        id: find-comment
+        with:
+          issue-number: ${{ steps.pr-number.outputs.pr-number }}
+          comment-author: "github-actions[bot]"
+          body-includes: "<!-- generated-comment ecosystem -->"
+
+      - name: Create or update comment
+        if: steps.find-comment.outcome == 'success'
+        uses: peter-evans/create-or-update-comment@v3
+        with:
+          comment-id: ${{ steps.find-comment.outputs.comment-id }}
+          issue-number: ${{ steps.pr-number.outputs.pr-number }}
+          body-path: comment.txt
+          edit-mode: replace

.github/workflows/release.yaml

@@ -0,0 +1,536 @@
+name: "[ruff] Release"
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "The version to tag, without the leading 'v'. If omitted, will initiate a dry run (no uploads)."
+        type: string
+      sha:
+        description: "The full sha of the commit to be released. If omitted, the latest commit on the default branch will be used."
+        default: ""
+        type: string
+  pull_request:
+    paths:
+      # When we change pyproject.toml, we want to ensure that the maturin builds still work
+      - pyproject.toml
+      # And when we change this workflow itself...
+      - .github/workflows/release.yaml
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  PACKAGE_NAME: ruff
+  PYTHON_VERSION: "3.11"
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
+  RUSTUP_MAX_RETRIES: 10
+
+jobs:
+  sdist:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build sdist"
+        uses: PyO3/maturin-action@v1
+        with:
+          command: sdist
+          args: --out dist
+      - name: "Test sdist"
+        run: |
+          pip install dist/${{ env.PACKAGE_NAME }}-*.tar.gz --force-reinstall
+          ruff --help
+          python -m ruff --help
+      - name: "Upload sdist"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+
+  macos-x86_64:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels - x86_64"
+        uses: PyO3/maturin-action@v1
+        with:
+          target: x86_64
+          args: --release --out dist
+      - name: "Test wheel - x86_64"
+        run: |
+          pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
+          ruff --help
+          python -m ruff --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        run: |
+          ARCHIVE_FILE=ruff-x86_64-apple-darwin.tar.gz
+          tar czvf $ARCHIVE_FILE -C target/x86_64-apple-darwin/release ruff
+          shasum -a 256 $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.tar.gz
+            *.sha256
+
+  macos-universal:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels - universal2"
+        uses: PyO3/maturin-action@v1
+        with:
+          args: --release --target universal2-apple-darwin --out dist
+      - name: "Test wheel - universal2"
+        run: |
+          pip install dist/${{ env.PACKAGE_NAME }}-*universal2.whl --force-reinstall
+          ruff --help
+          python -m ruff --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        run: |
+          ARCHIVE_FILE=ruff-aarch64-apple-darwin.tar.gz
+          tar czvf $ARCHIVE_FILE -C target/aarch64-apple-darwin/release ruff
+          shasum -a 256 $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.tar.gz
+            *.sha256
+
+  windows:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        platform:
+          - target: x86_64-pc-windows-msvc
+            arch: x64
+          - target: i686-pc-windows-msvc
+            arch: x86
+          - target: aarch64-pc-windows-msvc
+            arch: x64
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: ${{ matrix.platform.arch }}
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
+        with:
+          target: ${{ matrix.platform.target }}
+          args: --release --out dist
+      - name: "Test wheel"
+        if: ${{ !startsWith(matrix.platform.target, 'aarch64') }}
+        shell: bash
+        run: |
+          python -m pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
+          ruff --help
+          python -m ruff --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        shell: bash
+        run: |
+          ARCHIVE_FILE=ruff-${{ matrix.platform.target }}.zip
+          7z a $ARCHIVE_FILE ./target/${{ matrix.platform.target }}/release/ruff.exe
+          sha256sum $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.zip
+            *.sha256
+
+  linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target:
+          - x86_64-unknown-linux-gnu
+          - i686-unknown-linux-gnu
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          manylinux: auto
+          args: --release --out dist
+      - name: "Test wheel"
+        if: ${{ startsWith(matrix.target, 'x86_64') }}
+        run: |
+          pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
+          ruff --help
+          python -m ruff --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        run: |
+          ARCHIVE_FILE=ruff-${{ matrix.target }}.tar.gz
+          tar czvf $ARCHIVE_FILE -C target/${{ matrix.target }}/release ruff
+          shasum -a 256 $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.tar.gz
+            *.sha256
+
+  linux-cross:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform:
+          - target: aarch64-unknown-linux-gnu
+            arch: aarch64
+            # see https://github.com/astral-sh/ruff/issues/3791
+            # and https://github.com/gnzlbg/jemallocator/issues/170#issuecomment-1503228963
+            maturin_docker_options: -e JEMALLOC_SYS_WITH_LG_PAGE=16
+          - target: armv7-unknown-linux-gnueabihf
+            arch: armv7
+          - target: s390x-unknown-linux-gnu
+            arch: s390x
+          - target: powerpc64le-unknown-linux-gnu
+            arch: ppc64le
+          - target: powerpc64-unknown-linux-gnu
+            arch: ppc64
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
+        with:
+          target: ${{ matrix.platform.target }}
+          manylinux: auto
+          docker-options: ${{ matrix.platform.maturin_docker_options }}
+          args: --release --out dist
+      - uses: uraimo/run-on-arch-action@v2
+        if: matrix.platform.arch != 'ppc64'
+        name: Test wheel
+        with:
+          arch: ${{ matrix.platform.arch }}
+          distro: ubuntu20.04
+          githubToken: ${{ github.token }}
+          install: |
+            apt-get update
+            apt-get install -y --no-install-recommends python3 python3-pip
+            pip3 install -U pip
+          run: |
+            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
+            ruff --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        run: |
+          ARCHIVE_FILE=ruff-${{ matrix.platform.target }}.tar.gz
+          tar czvf $ARCHIVE_FILE -C target/${{ matrix.platform.target }}/release ruff
+          shasum -a 256 $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.tar.gz
+            *.sha256
+
+  musllinux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target:
+          - x86_64-unknown-linux-musl
+          - i686-unknown-linux-musl
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          manylinux: musllinux_1_2
+          args: --release --out dist
+      - name: "Test wheel"
+        if: matrix.target == 'x86_64-unknown-linux-musl'
+        uses: addnab/docker-run-action@v3
+        with:
+          image: alpine:latest
+          options: -v ${{ github.workspace }}:/io -w /io
+          run: |
+            apk add py3-pip
+            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links /io/dist/ --force-reinstall
+            ruff --help
+            python -m ruff --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        run: |
+          ARCHIVE_FILE=ruff-${{ matrix.target }}.tar.gz
+          tar czvf $ARCHIVE_FILE -C target/${{ matrix.target }}/release ruff
+          shasum -a 256 $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.tar.gz
+            *.sha256
+
+  musllinux-cross:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        platform:
+          - target: aarch64-unknown-linux-musl
+            arch: aarch64
+            maturin_docker_options: -e JEMALLOC_SYS_WITH_LG_PAGE=16
+          - target: armv7-unknown-linux-musleabihf
+            arch: armv7
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - name: "Prep README.md"
+        run: python scripts/transform_readme.py --target pypi
+      - name: "Build wheels"
+        uses: PyO3/maturin-action@v1
+        with:
+          target: ${{ matrix.platform.target }}
+          manylinux: musllinux_1_2
+          args: --release --out dist
+          docker-options: ${{ matrix.platform.maturin_docker_options }}
+      - uses: uraimo/run-on-arch-action@v2
+        name: Test wheel
+        with:
+          arch: ${{ matrix.platform.arch }}
+          distro: alpine_latest
+          githubToken: ${{ github.token }}
+          install: |
+            apk add py3-pip
+          run: |
+            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
+            ruff check --help
+      - name: "Upload wheels"
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels
+          path: dist
+      - name: "Archive binary"
+        run: |
+          ARCHIVE_FILE=ruff-${{ matrix.platform.target }}.tar.gz
+          tar czvf $ARCHIVE_FILE -C target/${{ matrix.platform.target }}/release ruff
+          shasum -a 256 $ARCHIVE_FILE > $ARCHIVE_FILE.sha256
+      - name: "Upload binary"
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: |
+            *.tar.gz
+            *.sha256
+
+  validate-tag:
+    name: Validate tag
+    runs-on: ubuntu-latest
+    # If you don't set an input tag, it's a dry run (no uploads).
+    if: ${{ inputs.tag }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main # We checkout the main branch to check for the commit
+      - name: Check main branch
+        if: ${{ inputs.sha }}
+        run: |
+          # Fetch the main branch since a shallow checkout is used by default
+          git fetch origin main --unshallow
+          if ! git branch --contains ${{ inputs.sha }} | grep -E '(^|\s)main$'; then
+            echo "The specified sha is not on the main branch" >&2
+            exit 1
+          fi
+      - name: Check tag consistency
+        run: |
+          # Switch to the commit we want to release
+          git checkout ${{ inputs.sha }}
+          version=$(grep "version = " pyproject.toml | sed -e 's/version = "\(.*\)"/\1/g')
+          if [ "${{ inputs.tag }}" != "${version}" ]; then
+            echo "The input tag does not match the version from pyproject.toml:" >&2
+            echo "${{ inputs.tag }}" >&2
+            echo "${version}" >&2
+            exit 1
+          else
+            echo "Releasing ${version}"
+          fi
+
+  upload-release:
+    name: Upload to PyPI
+    runs-on: ubuntu-latest
+    needs:
+      - macos-universal
+      - macos-x86_64
+      - windows
+      - linux
+      - linux-cross
+      - musllinux
+      - musllinux-cross
+      - validate-tag
+    # If you don't set an input tag, it's a dry run (no uploads).
+    if: ${{ inputs.tag }}
+    environment:
+      name: release
+    permissions:
+      # For pypi trusted publishing
+      id-token: write
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          name: wheels
+          path: wheels
+      - name: Publish to PyPi
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          skip-existing: true
+          packages-dir: wheels
+          verbose: true
+
+  tag-release:
+    name: Tag release
+    runs-on: ubuntu-latest
+    needs: upload-release
+    # If you don't set an input tag, it's a dry run (no uploads).
+    if: ${{ inputs.tag }}
+    permissions:
+      # For git tag
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.sha }}
+      - name: git tag
+        run: |
+          git config user.email "hey@astral.sh"
+          git config user.name "Ruff Release CI"
+          git tag -m "v${{ inputs.tag }}" "v${{ inputs.tag }}"
+          # If there is duplicate tag, this will fail. The publish to pypi action will have been a noop (due to skip
+          # existing), so we make a non-destructive exit here
+          git push --tags
+
+  publish-release:
+    name: Publish to GitHub
+    runs-on: ubuntu-latest
+    needs: tag-release
+    # If you don't set an input tag, it's a dry run (no uploads).
+    if: ${{ inputs.tag }}
+    permissions:
+      # For GitHub release publishing
+      contents: write
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          name: binaries
+          path: binaries
+      - name: "Publish to GitHub"
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          files: binaries/*
+          tag_name: v${{ inputs.tag }}
+
+  # After the release has been published, we update downstream repositories
+  # This is separate because if this fails the release is still fine, we just need to do some manual workflow triggers
+  update-dependents:
+    name: Update dependents
+    runs-on: ubuntu-latest
+    needs: publish-release
+    steps:
+      - name: "Update pre-commit mirror"
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.RUFF_PRE_COMMIT_PAT }}
+          script: |
+            github.rest.actions.createWorkflowDispatch({
+              owner: 'astral-sh',
+              repo: 'ruff-pre-commit',
+              workflow_id: 'main.yml',
+              ref: 'main',
+            })

.github/workflows/ruff.yaml

@@ -1,296 +0,0 @@
-name: "[ruff] Release"
-
-on:
-  create:
-    tags:
-      - v*
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-env:
-  PACKAGE_NAME: ruff
-  PYTHON_VERSION: "3.7" # to build abi3 wheels
-  CARGO_INCREMENTAL: 0
-  CARGO_NET_RETRY: 10
-  RUSTUP_MAX_RETRIES: 10
-
-jobs:
-  macos-x86_64:
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-          architecture: x64
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          default: true
-      - name: Build wheels - x86_64
-        uses: messense/maturin-action@v1
-        with:
-          target: x86_64
-          args: --release --out dist --sdist
-      - name: Install built wheel - x86_64
-        run: |
-          pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-  macos-universal:
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-          architecture: x64
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          default: true
-      - name: Build wheels - universal2
-        uses: messense/maturin-action@v1
-        with:
-          args: --release --universal2 --out dist
-      - name: Install built wheel - universal2
-        run: |
-          pip install dist/${{ env.PACKAGE_NAME }}-*universal2.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  windows:
-    runs-on: windows-latest
-    strategy:
-      matrix:
-        target: [x64, x86]
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-          architecture: ${{ matrix.target }}
-      - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          default: true
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.target }}
-          args: --release --out dist
-      - name: Install built wheel
-        shell: bash
-        run: |
-          python -m pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  linux:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        target: [x86_64, i686]
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-          architecture: x64
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.target }}
-          manylinux: auto
-          args: --release --out dist
-      - name: Install built wheel
-        if: matrix.target == 'x86_64'
-        run: |
-          pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  linux-cross:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        target: [aarch64, armv7, s390x, ppc64le, ppc64]
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.target }}
-          manylinux: auto
-          args: --no-default-features --release --out dist
-      - uses: uraimo/run-on-arch-action@v2.0.5
-        if: matrix.target != 'ppc64'
-        name: Install built wheel
-        with:
-          arch: ${{ matrix.target }}
-          distro: ubuntu20.04
-          githubToken: ${{ github.token }}
-          install: |
-            apt-get update
-            apt-get install -y --no-install-recommends python3 python3-pip
-            pip3 install -U pip
-          run: |
-            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  musllinux:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        target:
-          - x86_64-unknown-linux-musl
-          - i686-unknown-linux-musl
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-          architecture: x64
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.target }}
-          manylinux: musllinux_1_2
-          args: --release --out dist
-      - name: Install built wheel
-        if: matrix.target == 'x86_64-unknown-linux-musl'
-        uses: addnab/docker-run-action@v3
-        with:
-          image: alpine:latest
-          options: -v ${{ github.workspace }}:/io -w /io
-          run: |
-            apk add py3-pip
-            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links /io/dist/ --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  musllinux-cross:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        platform:
-          - target: aarch64-unknown-linux-musl
-            arch: aarch64
-          - target: armv7-unknown-linux-musleabihf
-            arch: armv7
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ env.PYTHON_VERSION }}
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.platform.target }}
-          manylinux: musllinux_1_2
-          args: --release --out dist
-      - uses: uraimo/run-on-arch-action@master
-        name: Install built wheel
-        with:
-          arch: ${{ matrix.platform.arch }}
-          distro: alpine_latest
-          githubToken: ${{ github.token }}
-          install: |
-            apk add py3-pip
-          run: |
-            pip3 install ${{ env.PACKAGE_NAME }} --no-index --find-links dist/ --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  pypy:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-        target: [x86_64, aarch64]
-        python-version:
-          - "3.7"
-          - "3.8"
-          - "3.9"
-        exclude:
-          - os: macos-latest
-            target: aarch64
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: pypy${{ matrix.python-version }}
-      - name: Build wheels
-        uses: messense/maturin-action@v1
-        with:
-          target: ${{ matrix.target }}
-          manylinux: auto
-          args: --release --out dist -i pypy${{ matrix.python-version }}
-      - name: Install built wheel
-        if: matrix.target == 'x86_64'
-        run: |
-          pip install dist/${{ env.PACKAGE_NAME }}-*.whl --force-reinstall
-      - name: Upload wheels
-        uses: actions/upload-artifact@v2
-        with:
-          name: wheels
-          path: dist
-
-  release:
-    name: Release
-    runs-on: ubuntu-latest
-    needs:
-      - macos-universal
-      - macos-x86_64
-      - windows
-      - linux
-      - linux-cross
-      - musllinux
-      - musllinux-cross
-      - pypy
-    if: "startsWith(github.ref, 'refs/tags/')"
-    steps:
-      - uses: actions/download-artifact@v2
-        with:
-          name: wheels
-      - uses: actions/setup-python@v4
-      - name: Publish to PyPi
-        env:
-          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.RUFF_TOKEN }}
-        run: |
-          pip install --upgrade twine
-          twine upload --skip-existing *

.gitignore

@@ -1,6 +1,25 @@
-# Local cache
-.ruff_cache
-resources/test/cpython
+# Benchmarking cpython (CONTRIBUTING.md)
+crates/ruff_linter/resources/test/cpython
+# generate_mkdocs.py
+mkdocs.generated.yml
+# check_ecosystem.py
+ruff-old
+github_search*.jsonl
+# update_schemastore.py
+schemastore
+# `maturin develop` and ecosystem_all_check.sh
+.venv*
+# Formatter debugging (crates/ruff_python_formatter/README.md)
+scratch.*
+# Created by `perf` (CONTRIBUTING.md)
+perf.data
+perf.data.old
+# Created by `flamegraph` (CONTRIBUTING.md)
+flamegraph.svg
+# Additional target directories that don't invalidate the main compile cache when changing linker settings,
+# e.g. `CARGO_TARGET_DIR=target-maturin maturin build --release --strip` or
+# `CARGO_TARGET_DIR=target-llvm-lines RUSTFLAGS="-Csymbol-mangling-version=v0" cargo llvm-lines -p ruff --lib`
+/target*
 
 ###
 # Rust.gitignore
@@ -181,3 +200,17 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 .idea/
+.vimspector.json
+
+# Visual Studio Code
+.vscode/
+
+# VIM
+.*.sw?
+.sw?
+
+# Custom re-inclusions for the resolver test cases
+!crates/ruff_python_resolver/resources/test/airflow/venv/
+!crates/ruff_python_resolver/resources/test/airflow/venv/lib
+!crates/ruff_python_resolver/resources/test/airflow/venv/lib/python3.11/site-packages/_watchdog_fsevents.cpython-311-darwin.so
+!crates/ruff_python_resolver/resources/test/airflow/venv/lib/python3.11/site-packages/orjson/orjson.cpython-311-darwin.so

.markdownlint.yaml

@@ -0,0 +1,20 @@
+# default to true for all rules
+default: true
+
+# MD007/unordered-list-indent
+MD007:
+  indent: 4
+
+# MD033/no-inline-html
+MD033: false
+
+# MD041/first-line-h1
+MD041: false
+
+# MD013/line-length
+MD013: false
+
+# MD024/no-duplicate-heading
+MD024:
+  # Allow when nested under different parents e.g. CHANGELOG.md
+  allow_different_nesting: true

.pre-commit-config.yaml

@@ -1,10 +1,79 @@
-repos:
-  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.160
-    hooks:
-      - id: ruff
+fail_fast: true
 
+exclude: |
+  (?x)^(
+    crates/ruff_linter/resources/.*|
+    crates/ruff_linter/src/rules/.*/snapshots/.*|
+    crates/ruff_cli/resources/.*|
+    crates/ruff_python_formatter/resources/.*|
+    crates/ruff_python_formatter/tests/snapshots/.*|
+    crates/ruff_python_resolver/resources/.*|
+    crates/ruff_python_resolver/tests/snapshots/.*
+  )$
+
+repos:
   - repo: https://github.com/abravalheri/validate-pyproject
-    rev: v0.10.1
+    rev: v0.15
     hooks:
       - id: validate-pyproject
+
+  - repo: https://github.com/executablebooks/mdformat
+    rev: 0.7.17
+    hooks:
+      - id: mdformat
+        additional_dependencies:
+          - mdformat-mkdocs
+          - mdformat-admon
+        exclude: |
+          (?x)^(
+            docs/formatter/black\.md
+            | docs/\w+\.md
+          )$
+
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.37.0
+    hooks:
+      - id: markdownlint-fix
+        exclude: |
+          (?x)^(
+            docs/formatter/black\.md
+            | docs/\w+\.md
+          )$
+
+  - repo: https://github.com/crate-ci/typos
+    rev: v1.16.22
+    hooks:
+      - id: typos
+
+  - repo: local
+    hooks:
+      - id: cargo-fmt
+        name: cargo fmt
+        entry: cargo fmt --
+        language: system
+        types: [rust]
+        pass_filenames: false # This makes it a lot faster
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.1.4
+    hooks:
+      - id: ruff-format
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+        types_or: [python, pyi]
+        require_serial: true
+        exclude: |
+          (?x)^(
+            crates/ruff_linter/resources/.*|
+            crates/ruff_python_formatter/resources/.*
+          )$
+
+  # Prettier
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v3.0.3
+    hooks:
+      - id: prettier
+        types: [yaml]
+
+ci:
+  skip: [cargo-fmt, dev-generate-all]

BREAKING_CHANGES.md

@@ -0,0 +1,332 @@
+# Breaking Changes
+
+## 0.1.0
+
+### The deprecated `format` setting has been removed
+
+Ruff previously used the `format` setting, `--format` CLI option, and `RUFF_FORMAT` environment variable to
+configure the output format of the CLI. This usage was deprecated in `v0.0.291` — the `format` setting is now used
+to control Ruff's code formatting. As of this release:
+
+- The `format` setting cannot be used to configure the output format, use `output-format` instead
+- The `RUFF_FORMAT` environment variable is ignored, use `RUFF_OUTPUT_FORMAT` instead
+- The `--format` option has been removed from `ruff check`, use `--output-format` instead
+
+### Unsafe fixes are not applied by default ([#7769](https://github.com/astral-sh/ruff/pull/7769))
+
+Ruff labels fixes as "safe" and "unsafe". The meaning and intent of your code will be retained when applying safe
+fixes, but the meaning could be changed when applying unsafe fixes. Previously, unsafe fixes were always displayed
+and applied when fixing was enabled. Now, unsafe fixes are hidden by default and not applied. The `--unsafe-fixes`
+flag or `unsafe-fixes` configuration option can be used to enable unsafe fixes.
+
+See the [docs](https://docs.astral.sh/ruff/configuration/#fix-safety) for details.
+
+### Remove formatter-conflicting rules from the default rule set  ([#7900](https://github.com/astral-sh/ruff/pull/7900))
+
+Previously, Ruff enabled all implemented rules in Pycodestyle (`E`) by default. Ruff now only includes the
+Pycodestyle prefixes `E4`, `E7`, and `E9` to exclude rules that conflict with automatic formatters. Consequently,
+the stable rule set no longer includes `line-too-long` (`E501`) and `mixed-spaces-and-tabs` (`E101`). Other
+excluded Pycodestyle rules include whitespace enforcement in `E1` and `E2`; these rules are currently in preview, and are already omitted by default.
+
+This change only affects those using Ruff under its default rule set. Users that include `E` in their `select` will experience no change in behavior.
+
+## 0.0.288
+
+### Remove support for emoji identifiers ([#7212](https://github.com/astral-sh/ruff/pull/7212))
+
+Previously, Ruff supported the non-standard compliant emoji identifiers e.g. `📦 = 1`.
+We decided to remove this non-standard language extension, and Ruff now reports syntax errors for emoji identifiers in your code, the same as CPython.
+
+### Improved GitLab fingerprints ([#7203](https://github.com/astral-sh/ruff/pull/7203))
+
+GitLab uses fingerprints to identify new, existing, or fixed violations. Previously, Ruff included the violation's position in the fingerprint. Using the location has the downside that changing any code before the violation causes the fingerprint to change, resulting in GitLab reporting one fixed and one new violation even though it is a pre-existing violation.
+
+Ruff now uses a more stable location-agnostic fingerprint to minimize that existing violations incorrectly get marked as fixed and re-reported as new violations.
+
+Expect GitLab to report each pre-existing violation in your project as fixed and a new violation in your Ruff upgrade PR.
+
+## 0.0.283 / 0.284
+
+### The target Python version now defaults to 3.8 instead of 3.10 ([#6397](https://github.com/astral-sh/ruff/pull/6397))
+
+Previously, when a target Python version was not specified, Ruff would use a default of Python 3.10. However, it is safer to default to an _older_ Python version to avoid assuming the availability of new features. We now default to the oldest supported Python version which is currently Python 3.8.
+
+(We still support Python 3.7 but since [it has reached EOL](https://devguide.python.org/versions/#unsupported-versions) we've decided not to make it the default here.)
+
+Note this change was announced in 0.0.283 but not active until 0.0.284.
+
+## 0.0.277
+
+### `.ipynb_checkpoints`, `.pyenv`, `.pytest_cache`, and `.vscode` are now excluded by default ([#5513](https://github.com/astral-sh/ruff/pull/5513))
+
+Ruff maintains a list of default exclusions, which now consists of the following patterns:
+
+- `.bzr`
+- `.direnv`
+- `.eggs`
+- `.git`
+- `.git-rewrite`
+- `.hg`
+- `.ipynb_checkpoints`
+- `.mypy_cache`
+- `.nox`
+- `.pants.d`
+- `.pyenv`
+- `.pytest_cache`
+- `.pytype`
+- `.ruff_cache`
+- `.svn`
+- `.tox`
+- `.venv`
+- `.vscode`
+- `__pypackages__`
+- `_build`
+- `buck-out`
+- `build`
+- `dist`
+- `node_modules`
+- `venv`
+
+Previously, the `.ipynb_checkpoints`, `.pyenv`, `.pytest_cache`, and `.vscode` directories were not
+excluded by default. This change brings Ruff's default exclusions in line with other tools like
+Black.
+
+## 0.0.276
+
+### The `keep-runtime-typing` setting has been reinstated ([#5470](https://github.com/astral-sh/ruff/pull/5470))
+
+The `keep-runtime-typing` setting has been reinstated with revised semantics. This setting was
+removed in [#4427](https://github.com/astral-sh/ruff/pull/4427), as it was equivalent to ignoring
+the `UP006` and `UP007` rules via Ruff's standard `ignore` mechanism.
+
+Taking `UP006` (rewrite `List[int]` to `list[int]`) as an example, the setting now behaves as
+follows:
+
+- On Python 3.7 and Python 3.8, setting `keep-runtime-typing = true` will cause Ruff to ignore
+    `UP006` violations, even if `from __future__ import annotations` is present in the file.
+    While such annotations are valid in Python 3.7 and Python 3.8 when combined with
+    `from __future__ import annotations`, they aren't supported by libraries like Pydantic and
+    FastAPI, which rely on runtime type checking.
+- On Python 3.9 and above, the setting has no effect, as `list[int]` is a valid type annotation,
+    and libraries like Pydantic and FastAPI support it without issue.
+
+In short: `keep-runtime-typing` can be used to ensure that Ruff doesn't introduce type annotations
+that are not supported at runtime by the current Python version, which are unsupported by libraries
+like Pydantic and FastAPI.
+
+Note that this is not a breaking change, but is included here to complement the previous removal
+of `keep-runtime-typing`.
+
+## 0.0.268
+
+### The `keep-runtime-typing` setting has been removed ([#4427](https://github.com/astral-sh/ruff/pull/4427))
+
+Enabling the `keep-runtime-typing` option, located under the `pyupgrade` section, is equivalent
+to ignoring the `UP006` and `UP007` rules via Ruff's standard `ignore` mechanism. As there's no
+need for a dedicated setting to disable these rules, the `keep-runtime-typing` option has been
+removed.
+
+## 0.0.267
+
+### `update-check` is no longer a valid configuration option ([#4313](https://github.com/astral-sh/ruff/pull/4313))
+
+The `update-check` functionality was deprecated in [#2530](https://github.com/astral-sh/ruff/pull/2530),
+in that the behavior itself was removed, and Ruff was changed to warn when that option was enabled.
+
+Now, Ruff will throw an error when `update-check` is provided via a configuration file (e.g.,
+`update-check = false`) or through the command-line, since it has no effect. Users should remove
+this option from their configuration.
+
+## 0.0.265
+
+### `--fix-only` now exits with a zero exit code, unless `--exit-non-zero-on-fix` is specified ([#4146](https://github.com/astral-sh/ruff/pull/4146))
+
+Previously, `--fix-only` would exit with a non-zero exit code if any fixes were applied. This
+behavior was inconsistent with `--fix`, and further, meant that `--exit-non-zero-on-fix` was
+effectively ignored when `--fix-only` was specified.
+
+Now, `--fix-only` will exit with a zero exit code, unless `--exit-non-zero-on-fix` is specified,
+in which case it will exit with a non-zero exit code if any fixes were applied.
+
+## 0.0.260
+
+### Fixes are now represented as a list of edits ([#3709](https://github.com/astral-sh/ruff/pull/3709))
+
+Previously, Ruff represented each fix as a single edit, which prohibited Ruff from automatically
+fixing violations that required multiple edits across a file. As such, Ruff now represents each
+fix as a list of edits.
+
+This primarily affects the JSON API. Ruff's JSON representation used to represent the `fix` field as
+a single edit, like so:
+
+```json
+{
+    "message": "Remove unused import: `sys`",
+    "content": "",
+    "location": {"row": 1, "column": 0},
+    "end_location": {"row": 2, "column": 0}
+}
+```
+
+The updated representation instead includes a list of edits:
+
+```json
+{
+    "message": "Remove unused import: `sys`",
+    "edits": [
+        {
+            "content": "",
+            "location": {"row": 1, "column": 0},
+            "end_location": {"row": 2, "column": 0},
+        }
+    ]
+}
+```
+
+## 0.0.246
+
+### `multiple-statements-on-one-line-def` (`E704`) was removed ([#2773](https://github.com/astral-sh/ruff/pull/2773))
+
+This rule was introduced in v0.0.245. However, it turns out that pycodestyle and Flake8 ignore this
+rule by default, as it is not part of PEP 8. As such, we've removed it from Ruff.
+
+## 0.0.245
+
+### Ruff's public `check` method was removed ([#2709](https://github.com/astral-sh/ruff/pull/2709))
+
+Previously, Ruff exposed a `check` method as a public Rust API. This method was used by few,
+if any clients, and was not well documented or supported. As such, it has been removed, with
+the intention of adding a stable public API in the future.
+
+## 0.0.238
+
+### `select`, `extend-select`, `ignore`, and `extend-ignore` have new semantics ([#2312](https://github.com/astral-sh/ruff/pull/2312))
+
+Previously, the interplay between `select` and its related options could lead to unexpected
+behavior. For example, `ruff --select E501 --ignore ALL` and `ruff --select E501 --extend-ignore ALL`
+behaved differently. (See [#2312](https://github.com/astral-sh/ruff/pull/2312) for more
+examples.)
+
+When Ruff determines the enabled rule set, it has to reconcile `select` and `ignore` from a variety
+of sources, including the current `pyproject.toml`, any inherited `pyproject.toml` files, and the
+CLI.
+
+The new semantics are such that Ruff uses the "highest-priority" `select` as the basis for the rule
+set, and then applies any `extend-select`, `ignore`, and `extend-ignore` adjustments. CLI options
+are given higher priority than `pyproject.toml` options, and the current `pyproject.toml` file is
+given higher priority than any inherited `pyproject.toml` files.
+
+`extend-select` and `extend-ignore` are no longer given "top priority"; instead, they merely append
+to the `select` and `ignore` lists, as in Flake8.
+
+This change is largely backwards compatible -- most users should experience no change in behavior.
+However, as an example of a breaking change, consider the following:
+
+```toml
+[tool.ruff]
+ignore = ["F401"]
+```
+
+Running `ruff --select F` would previously have enabled all `F` rules, apart from `F401`. Now, it
+will enable all `F` rules, including `F401`, as the command line's `--select` resets the resolution.
+
+### `remove-six-compat` (`UP016`) has been removed ([#2332](https://github.com/astral-sh/ruff/pull/2332))
+
+The `remove-six-compat` rule has been removed. This rule was only useful for one-time Python 2-to-3
+upgrades.
+
+## 0.0.237
+
+### `--explain`, `--clean`, and `--generate-shell-completion` are now subcommands ([#2190](https://github.com/astral-sh/ruff/pull/2190))
+
+`--explain`, `--clean`, and `--generate-shell-completion` are now implemented as subcommands:
+
+```console
+ruff .         # Still works! And will always work.
+ruff check .   # New! Also works.
+
+ruff --explain E402   # Still works.
+ruff rule E402        # New! Also works. (And preferred.)
+
+# Oops! The command has to come first.
+ruff --format json --explain E402   # No longer works.
+ruff --explain E402 --format json   # Still works!
+ruff rule E402   --format json      # Works! (And preferred.)
+```
+
+This change is largely backwards compatible -- most users should experience
+no change in behavior. However, please note the following exceptions:
+
+- Subcommands will now fail when invoked with unsupported arguments, instead
+    of silently ignoring them. For example, the following will now fail:
+
+    ```console
+    ruff --clean --respect-gitignore
+    ```
+
+    (the `clean` command doesn't support `--respect-gitignore`.)
+
+- The semantics of `ruff <arg>` have changed slightly when `<arg>` is a valid subcommand.
+    For example, prior to this release, running `ruff rule` would run `ruff` over a file or
+    directory called `rule`. Now, `ruff rule` would invoke the `rule` subcommand. This should
+    only impact projects with files or directories named `rule`, `check`, `explain`, `clean`,
+    or `generate-shell-completion`.
+
+- Scripts that invoke ruff should supply `--` before any positional arguments.
+    (The semantics of `ruff -- <arg>` have not changed.)
+
+- `--explain` previously treated `--format grouped` as a synonym for `--format text`.
+    This is no longer supported; instead, use `--format text`.
+
+## 0.0.226
+
+### `misplaced-comparison-constant` (`PLC2201`) was deprecated in favor of `SIM300` ([#1980](https://github.com/astral-sh/ruff/pull/1980))
+
+These two rules contain (nearly) identical logic. To deduplicate the rule set, we've upgraded
+`SIM300` to handle a few more cases, and deprecated `PLC2201` in favor of `SIM300`.
+
+## 0.0.225
+
+### `@functools.cache` rewrites have been moved to a standalone rule (`UP033`) ([#1938](https://github.com/astral-sh/ruff/pull/1938))
+
+Previously, `UP011` handled both `@functools.lru_cache()`-to-`@functools.lru_cache` conversions,
+_and_ `@functools.lru_cache(maxsize=None)`-to-`@functools.cache` conversions. The latter has been
+moved out to its own rule (`UP033`). As such, some `# noqa: UP011` comments may need to be updated
+to reflect the change in rule code.
+
+## 0.0.222
+
+### `--max-complexity` has been removed from the CLI ([#1877](https://github.com/astral-sh/ruff/pull/1877))
+
+The McCabe plugin's `--max-complexity` setting has been removed from the CLI, for consistency with
+the treatment of other, similar settings.
+
+To set the maximum complexity, use the `max-complexity` property in your `pyproject.toml` file,
+like so:
+
+```toml
+[tool.ruff.mccabe]
+max-complexity = 10
+```
+
+## 0.0.181
+
+### Files excluded by `.gitignore` are now ignored ([#1234](https://github.com/astral-sh/ruff/pull/1234))
+
+Ruff will now avoid checking files that are excluded by `.ignore`, `.gitignore`,
+`.git/info/exclude`, and global `gitignore` files. This behavior is powered by the [`ignore`](https://docs.rs/ignore/latest/ignore/struct.WalkBuilder.html#ignore-rules)
+crate, and is applied in addition to Ruff's built-in `exclude` system.
+
+To disable this behavior, set `respect-gitignore = false` in your `pyproject.toml` file.
+
+Note that hidden files (i.e., files and directories prefixed with a `.`) are _not_ ignored by
+default.
+
+## 0.0.178
+
+### Configuration files are now resolved hierarchically ([#1190](https://github.com/astral-sh/ruff/pull/1190))
+
+`pyproject.toml` files are now resolved hierarchically, such that for each Python file, we find
+the first `pyproject.toml` file in its path, and use that to determine its lint settings.
+
+See the [documentation](https://docs.astral.sh/ruff/configuration/#python-file-discovery) for more.

CHANGELOG.md

@@ -0,0 +1,384 @@
+# Changelog
+
+## 0.1.5
+
+### Preview features
+
+- \[`flake8-bandit`\] Implement `mako-templates` (`S702`) ([#8533](https://github.com/astral-sh/ruff/pull/8533))
+- \[`flake8-trio`\] Implement `TRIO105` ([#8490](https://github.com/astral-sh/ruff/pull/8490))
+- \[`flake8-trio`\] Implement `TRIO109` ([#8534](https://github.com/astral-sh/ruff/pull/8534))
+- \[`flake8-trio`\] Implement `TRIO110` ([#8537](https://github.com/astral-sh/ruff/pull/8537))
+- \[`flake8-trio`\] Implement `TRIO115` ([#8486](https://github.com/astral-sh/ruff/pull/8486))
+- \[`refurb`\] Implement `type-none-comparison` (`FURB169`) ([#8487](https://github.com/astral-sh/ruff/pull/8487))
+- Flag all comparisons against builtin types in `E721` ([#8491](https://github.com/astral-sh/ruff/pull/8491))
+- Make `SIM118` fix as safe when the expression is a known dictionary  ([#8525](https://github.com/astral-sh/ruff/pull/8525))
+
+### Formatter
+
+- Fix multiline lambda expression statement formatting ([#8466](https://github.com/astral-sh/ruff/pull/8466))
+
+### CLI
+
+- Add hidden `--extension` to override inference of source type from file extension ([#8373](https://github.com/astral-sh/ruff/pull/8373))
+
+### Configuration
+
+- Account for selector specificity when merging `extend_unsafe_fixes` and `override extend_safe_fixes` ([#8444](https://github.com/astral-sh/ruff/pull/8444))
+- Add support for disabling cache with `RUFF_NO_CACHE` environment variable ([#8538](https://github.com/astral-sh/ruff/pull/8538))
+
+### Bug fixes
+
+- \[`E721`\] Flag comparisons to `memoryview` ([#8485](https://github.com/astral-sh/ruff/pull/8485))
+- Allow collapsed-ellipsis bodies in other statements ([#8499](https://github.com/astral-sh/ruff/pull/8499))
+- Avoid `D301` autofix for `u` prefixed strings ([#8495](https://github.com/astral-sh/ruff/pull/8495))
+- Only flag `flake8-trio` rules when `trio` import is present ([#8550](https://github.com/astral-sh/ruff/pull/8550))
+- Reject more syntactically invalid Python programs ([#8524](https://github.com/astral-sh/ruff/pull/8524))
+- Avoid raising `TRIO115` violations for `trio.sleep(...)` calls with non-number values ([#8532](https://github.com/astral-sh/ruff/pull/8532))
+- Fix `F841` false negative on assignment to multiple variables ([#8489](https://github.com/astral-sh/ruff/pull/8489))
+
+### Documentation
+
+- Fix link to isort `known-first-party` ([#8562](https://github.com/astral-sh/ruff/pull/8562))
+- Add notes on fix safety to a few rules ([#8500](https://github.com/astral-sh/ruff/pull/8500))
+- Add missing toml config tabs ([#8512](https://github.com/astral-sh/ruff/pull/8512))
+- Add instructions for configuration of Emacs ([#8488](https://github.com/astral-sh/ruff/pull/8488))
+- Improve detail link contrast in dark mode ([#8548](https://github.com/astral-sh/ruff/pull/8548))
+- Fix typo in example ([#8506](https://github.com/astral-sh/ruff/pull/8506))
+- Added tabs for configuration files in the documentation ([#8480](https://github.com/astral-sh/ruff/pull/8480))
+- Recommend `project.requires-python` over `target-version` ([#8513](https://github.com/astral-sh/ruff/pull/8513))
+- Add singleton escape hatch to `B008` documentation ([#8501](https://github.com/astral-sh/ruff/pull/8501))
+- Fix tab configuration docs ([#8502](https://github.com/astral-sh/ruff/pull/8502))
+
+## 0.1.4
+
+### Preview features
+
+- \[`flake8-trio`\] Implement `timeout-without-await` (`TRIO001`) ([#8439](https://github.com/astral-sh/ruff/pull/8439))
+- \[`numpy`\] Implement NumPy 2.0 migration rule (`NPY200`) ([#7702](https://github.com/astral-sh/ruff/pull/7702))
+- \[`pylint`\] Implement `bad-open-mode` (`W1501`) ([#8294](https://github.com/astral-sh/ruff/pull/8294))
+- \[`pylint`\] Implement `import-outside-toplevel` (`C0415`) rule ([#5180](https://github.com/astral-sh/ruff/pull/5180))
+- \[`pylint`\] Implement `useless-with-lock` (`W2101`) ([#8321](https://github.com/astral-sh/ruff/pull/8321))
+- \[`pyupgrade`\] Implement `timeout-error-alias` (`UP041`) ([#8476](https://github.com/astral-sh/ruff/pull/8476))
+- \[`refurb`\] Implement `isinstance-type-none` (`FURB168`) ([#8308](https://github.com/astral-sh/ruff/pull/8308))
+- Detect confusable Unicode-to-Unicode units in `RUF001`, `RUF002`, and `RUF003` ([#4430](https://github.com/astral-sh/ruff/pull/4430))
+- Add newline after module docstrings in preview style ([#8283](https://github.com/astral-sh/ruff/pull/8283))
+
+### Formatter
+
+- Add a note on line-too-long to the formatter docs ([#8314](https://github.com/astral-sh/ruff/pull/8314))
+- Preserve trailing statement semicolons when using `fmt: skip` ([#8273](https://github.com/astral-sh/ruff/pull/8273))
+- Preserve trailing semicolons when using `fmt: off` ([#8275](https://github.com/astral-sh/ruff/pull/8275))
+- Avoid duplicating linter-formatter compatibility warnings ([#8292](https://github.com/astral-sh/ruff/pull/8292))
+- Avoid inserting a newline after function docstrings ([#8375](https://github.com/astral-sh/ruff/pull/8375))
+- Insert newline between docstring and following own line comment ([#8216](https://github.com/astral-sh/ruff/pull/8216))
+- Split tuples in return positions by comma first ([#8280](https://github.com/astral-sh/ruff/pull/8280))
+- Avoid treating byte strings as docstrings ([#8350](https://github.com/astral-sh/ruff/pull/8350))
+- Add `--line-length` option to `format` command ([#8363](https://github.com/astral-sh/ruff/pull/8363))
+- Avoid parenthesizing unsplittable because of comments ([#8431](https://github.com/astral-sh/ruff/pull/8431))
+
+### CLI
+
+- Add `--output-format` to `ruff rule` and `ruff linter` ([#8203](https://github.com/astral-sh/ruff/pull/8203))
+
+### Bug fixes
+
+- Respect `--force-exclude` in `lint.exclude` and `format.exclude` ([#8393](https://github.com/astral-sh/ruff/pull/8393))
+- Respect `--extend-per-file-ignores` on the CLI ([#8329](https://github.com/astral-sh/ruff/pull/8329))
+- Extend `bad-dunder-method-name` to permit `__index__` ([#8300](https://github.com/astral-sh/ruff/pull/8300))
+- Fix panic with 8 in octal escape ([#8356](https://github.com/astral-sh/ruff/pull/8356))
+- Avoid raising `D300` when both triple quote styles are present ([#8462](https://github.com/astral-sh/ruff/pull/8462))
+- Consider unterminated f-strings in `FStringRanges` ([#8154](https://github.com/astral-sh/ruff/pull/8154))
+- Avoid including literal `shell=True` for truthy, non-`True` diagnostics ([#8359](https://github.com/astral-sh/ruff/pull/8359))
+- Avoid triggering single-element test for starred expressions ([#8433](https://github.com/astral-sh/ruff/pull/8433))
+- Detect and ignore Jupyter automagics ([#8398](https://github.com/astral-sh/ruff/pull/8398))
+- Fix invalid E231 error with f-strings ([#8369](https://github.com/astral-sh/ruff/pull/8369))
+- Avoid triggering `NamedTuple` rewrite with starred annotation ([#8434](https://github.com/astral-sh/ruff/pull/8434))
+- Avoid un-setting bracket flag in logical lines ([#8380](https://github.com/astral-sh/ruff/pull/8380))
+- Place 'r' prefix before 'f' for raw format strings ([#8464](https://github.com/astral-sh/ruff/pull/8464))
+- Remove trailing periods from NumPy 2.0 code actions ([#8475](https://github.com/astral-sh/ruff/pull/8475))
+- Fix bug where `PLE1307` was raised when formatting `%c` with characters ([#8407](https://github.com/astral-sh/ruff/pull/8407))
+- Remove unicode flag from comparable ([#8440](https://github.com/astral-sh/ruff/pull/8440))
+- Improve B015 message ([#8295](https://github.com/astral-sh/ruff/pull/8295))
+- Use `fixedOverflowWidgets` for playground popover ([#8458](https://github.com/astral-sh/ruff/pull/8458))
+- Mark `byte_bounds` as a non-backwards-compatible NumPy 2.0 change ([#8474](https://github.com/astral-sh/ruff/pull/8474))
+
+### Internals
+
+- Add a dedicated cache directory per Ruff version ([#8333](https://github.com/astral-sh/ruff/pull/8333))
+- Allow selective caching for `--fix` and `--diff` ([#8316](https://github.com/astral-sh/ruff/pull/8316))
+- Improve performance of comment parsing ([#8193](https://github.com/astral-sh/ruff/pull/8193))
+- Improve performance of string parsing ([#8227](https://github.com/astral-sh/ruff/pull/8227))
+- Use a dedicated sort key for isort import sorting ([#7963](https://github.com/astral-sh/ruff/pull/7963))
+
+## 0.1.3
+
+This release includes a variety of improvements to the Ruff formatter, removing several known and
+unintentional deviations from Black.
+
+### Formatter
+
+- Avoid space around pow for `None`, `True` and `False` ([#8189](https://github.com/astral-sh/ruff/pull/8189))
+- Avoid sorting all paths in the format command ([#8181](https://github.com/astral-sh/ruff/pull/8181))
+- Insert necessary blank line between class and leading comments ([#8224](https://github.com/astral-sh/ruff/pull/8224))
+- Avoid introducing new parentheses in annotated assignments ([#8233](https://github.com/astral-sh/ruff/pull/8233))
+- Refine the warnings about incompatible linter options ([#8196](https://github.com/astral-sh/ruff/pull/8196))
+- Add test and basic implementation for formatter preview mode ([#8044](https://github.com/astral-sh/ruff/pull/8044))
+- Refine warning about incompatible `isort` settings ([#8192](https://github.com/astral-sh/ruff/pull/8192))
+- Only omit optional parentheses for starting or ending with parentheses ([#8238](https://github.com/astral-sh/ruff/pull/8238))
+- Use source type to determine parser mode for formatting ([#8205](https://github.com/astral-sh/ruff/pull/8205))
+- Don't warn about magic trailing comma when `isort.force-single-line` is true ([#8244](https://github.com/astral-sh/ruff/pull/8244))
+- Use `SourceKind::diff` for formatter ([#8240](https://github.com/astral-sh/ruff/pull/8240))
+- Fix `fmt:off` with trailing child comment ([#8234](https://github.com/astral-sh/ruff/pull/8234))
+- Formatter parentheses support for `IpyEscapeCommand` ([#8207](https://github.com/astral-sh/ruff/pull/8207))
+
+### Linter
+
+- \[`pylint`\] Add buffer methods to `bad-dunder-method-name` (`PLW3201`) exclusions ([#8190](https://github.com/astral-sh/ruff/pull/8190))
+- Match rule prefixes from `external` codes setting in `unused-noqa` ([#8177](https://github.com/astral-sh/ruff/pull/8177))
+- Use `line-length` setting for isort in lieu of `pycodestyle.max-line-length` ([#8235](https://github.com/astral-sh/ruff/pull/8235))
+- Update fix for `unnecessary-paren-on-raise-exception` to unsafe for unknown types ([#8231](https://github.com/astral-sh/ruff/pull/8231))
+- Correct quick fix message for `W605` ([#8255](https://github.com/astral-sh/ruff/pull/8255))
+
+### Documentation
+
+- Fix typo in max-doc-length documentation ([#8201](https://github.com/astral-sh/ruff/pull/8201))
+- Improve documentation around linter-formatter conflicts ([#8257](https://github.com/astral-sh/ruff/pull/8257))
+- Fix link to error suppression documentation in `unused-noqa` ([#8172](https://github.com/astral-sh/ruff/pull/8172))
+- Add `external` option to `unused-noqa` documentation ([#8171](https://github.com/astral-sh/ruff/pull/8171))
+- Add title attribute to icons ([#8060](https://github.com/astral-sh/ruff/pull/8060))
+- Clarify unsafe case in RSE102 ([#8256](https://github.com/astral-sh/ruff/pull/8256))
+- Fix skipping formatting examples ([#8210](https://github.com/astral-sh/ruff/pull/8210))
+- docs: fix name of `magic-trailing-comma` option in README ([#8200](https://github.com/astral-sh/ruff/pull/8200))
+- Add note about scope of rule changing in versioning policy ([#8169](https://github.com/astral-sh/ruff/pull/8169))
+- Document: Fix default lint rules ([#8218](https://github.com/astral-sh/ruff/pull/8218))
+- Fix a wrong setting in configuration.md ([#8186](https://github.com/astral-sh/ruff/pull/8186))
+- Fix misspelled TOML headers in the tutorial ([#8209](https://github.com/astral-sh/ruff/pull/8209))
+
+## 0.1.2
+
+This release includes the Beta version of the Ruff formatter — an extremely fast, Black-compatible Python formatter.
+Try it today with `ruff format`! [Check out the blog post](https://astral.sh/blog/the-ruff-formatter) and [read the docs](https://docs.astral.sh/ruff/formatter/).
+
+### Preview features
+
+- \[`pylint`\] Implement `non-ascii-module-import` (`C2403`) ([#8056](https://github.com/astral-sh/ruff/pull/8056))
+- \[`pylint`\] implement `non-ascii-name` (`C2401`) ([#8038](https://github.com/astral-sh/ruff/pull/8038))
+- \[`pylint`\] Implement unnecessary-lambda (W0108) ([#7953](https://github.com/astral-sh/ruff/pull/7953))
+- \[`refurb`\] Implement `read-whole-file` (`FURB101`) ([#7682](https://github.com/astral-sh/ruff/pull/7682))
+- Add fix for `E223`, `E224`, and `E242` ([#8143](https://github.com/astral-sh/ruff/pull/8143))
+- Add fix for `E225`, `E226`, `E227`, and `E228` ([#8136](https://github.com/astral-sh/ruff/pull/8136))
+- Add fix for `E252` ([#8142](https://github.com/astral-sh/ruff/pull/8142))
+- Add fix for `E261` ([#8114](https://github.com/astral-sh/ruff/pull/8114))
+- Add fix for `E273` and `E274` ([#8144](https://github.com/astral-sh/ruff/pull/8144))
+- Add fix for `E275` ([#8133](https://github.com/astral-sh/ruff/pull/8133))
+- Update `SIM401` to catch ternary operations ([#7415](https://github.com/astral-sh/ruff/pull/7415))
+- Update `E721` to allow `is` and `is` not for direct type comparisons ([#7905](https://github.com/astral-sh/ruff/pull/7905))
+
+### Rule changes
+
+- Add `backports.strenum` to `deprecated-imports` ([#8113](https://github.com/astral-sh/ruff/pull/8113))
+- Update `SIM112` to ignore `https_proxy`, `http_proxy`, and `no_proxy` ([#8140](https://github.com/astral-sh/ruff/pull/8140))
+- Update fix for `literal-membership` (`PLR6201`) to be unsafe ([#8097](https://github.com/astral-sh/ruff/pull/8097))
+- Update fix for  `mutable-argument-defaults` (`B006`) to be unsafe ([#8108](https://github.com/astral-sh/ruff/pull/8108))
+
+### Formatter
+
+- Change `line-ending` default to `auto` ([#8057](https://github.com/astral-sh/ruff/pull/8057))
+- Respect parenthesized generators in `has_own_parentheses` ([#8100](https://github.com/astral-sh/ruff/pull/8100))
+- Add caching to formatter ([#8089](https://github.com/astral-sh/ruff/pull/8089))
+- Remove `--line-length` option from `format` command ([#8131](https://github.com/astral-sh/ruff/pull/8131))
+- Add formatter to `line-length` documentation ([#8150](https://github.com/astral-sh/ruff/pull/8150))
+- Warn about incompatible formatter options ([#8088](https://github.com/astral-sh/ruff/pull/8088))
+- Fix range of unparenthesized tuple subject in match statement ([#8101](https://github.com/astral-sh/ruff/pull/8101))
+- Remove experimental formatter warning ([#8148](https://github.com/astral-sh/ruff/pull/8148))
+- Don't move type param opening parenthesis comment ([#8163](https://github.com/astral-sh/ruff/pull/8163))
+- Update versions in format benchmark script ([#8110](https://github.com/astral-sh/ruff/pull/8110))
+- Avoid loading files for cached format results ([#8134](https://github.com/astral-sh/ruff/pull/8134))
+
+### CLI
+
+- Show the `ruff format` command in help menus ([#8167](https://github.com/astral-sh/ruff/pull/8167))
+- Add `ruff version` command with long version display ([#8034](https://github.com/astral-sh/ruff/pull/8034))
+
+### Configuration
+
+- New `pycodestyle.max-line-length` option ([#8039](https://github.com/astral-sh/ruff/pull/8039))
+
+### Bug fixes
+
+- Detect `sys.version_info` slices in `outdated-version-block` ([#8112](https://github.com/astral-sh/ruff/pull/8112))
+- Avoid if-else simplification for `TYPE_CHECKING` blocks ([#8072](https://github.com/astral-sh/ruff/pull/8072))
+- Avoid false-positive print separator diagnostic with starred argument ([#8079](https://github.com/astral-sh/ruff/pull/8079))
+
+### Documentation
+
+- Fix message for `too-many-arguments` lint ([#8092](https://github.com/astral-sh/ruff/pull/8092))
+- Fix `extend-unsafe-fixes` and `extend-safe-fixes` example ([#8139](https://github.com/astral-sh/ruff/pull/8139))
+- Add links to `flake8-import-conventions` options ([#8115](https://github.com/astral-sh/ruff/pull/8115))
+- Rework the documentation to incorporate the Ruff formatter ([#7732](https://github.com/astral-sh/ruff/pull/7732))
+- Fix `Options` JSON schema description ([#8081](https://github.com/astral-sh/ruff/pull/8081))
+- Fix typo (`pytext` -> `pytest`) ([#8117](https://github.com/astral-sh/ruff/pull/8117))
+- Improve `magic-value-comparison` example in docs ([#8111](https://github.com/astral-sh/ruff/pull/8111))
+
+## 0.1.1
+
+### Rule changes
+
+- Add unsafe fix for `escape-sequence-in-docstring` (`D301`) ([#7970](https://github.com/astral-sh/ruff/pull/7970))
+
+### Configuration
+
+- Respect `#(deprecated)` attribute in configuration options ([#8035](https://github.com/astral-sh/ruff/pull/8035))
+- Add `[format|lint].exclude` options ([#8000](https://github.com/astral-sh/ruff/pull/8000))
+- Respect `tab-size` setting in formatter ([#8006](https://github.com/astral-sh/ruff/pull/8006))
+- Add `lint.preview` ([#8002](https://github.com/astral-sh/ruff/pull/8002))
+
+### Preview features
+
+- \[`pylint`\] Implement `literal-membership` (`PLR6201`) ([#7973](https://github.com/astral-sh/ruff/pull/7973))
+- \[`pylint`\] Implement `too-many-boolean-expressions` (`PLR0916`) ([#7975](https://github.com/astral-sh/ruff/pull/7975))
+- \[`pylint`\] Implement `misplaced-bare-raise` (`E0704`) ([#7961](https://github.com/astral-sh/ruff/pull/7961))
+- \[`pylint`\] Implement `global-at-module-level` (`W0604`) ([#8058](https://github.com/astral-sh/ruff/pull/8058))
+- \[`pylint`\] Implement `unspecified-encoding` (`PLW1514`) ([#7939](https://github.com/astral-sh/ruff/pull/7939))
+- Add fix for `triple-single-quotes` (`D300`) ([#7967](https://github.com/astral-sh/ruff/pull/7967))
+
+### Formatter
+
+- New code style badge for `ruff format` ([#7878](https://github.com/astral-sh/ruff/pull/7878))
+- Fix comments outside expression parentheses ([#7873](https://github.com/astral-sh/ruff/pull/7873))
+- Add `--target-version` to `ruff format` ([#8055](https://github.com/astral-sh/ruff/pull/8055))
+- Skip over parentheses when detecting `in` keyword ([#8054](https://github.com/astral-sh/ruff/pull/8054))
+- Add `--diff` option to `ruff format` ([#7937](https://github.com/astral-sh/ruff/pull/7937))
+- Insert newline after nested function or class statements ([#7946](https://github.com/astral-sh/ruff/pull/7946))
+- Use `pass` over ellipsis in non-function/class contexts ([#8049](https://github.com/astral-sh/ruff/pull/8049))
+
+### Bug fixes
+
+- Lazily evaluate all PEP 695 type alias values ([#8033](https://github.com/astral-sh/ruff/pull/8033))
+- Avoid failed assertion when showing fixes from stdin ([#8029](https://github.com/astral-sh/ruff/pull/8029))
+- Avoid flagging HTTP and HTTPS literals in urllib-open ([#8046](https://github.com/astral-sh/ruff/pull/8046))
+- Avoid flagging `bad-dunder-method-name` for `_` ([#8015](https://github.com/astral-sh/ruff/pull/8015))
+- Remove Python 2-only methods from `URLOpen` audit ([#8047](https://github.com/astral-sh/ruff/pull/8047))
+- Use set bracket replacement for `iteration-over-set` to preserve whitespace and comments ([#8001](https://github.com/astral-sh/ruff/pull/8001))
+
+### Documentation
+
+- Update tutorial to match revised Ruff defaults ([#8066](https://github.com/astral-sh/ruff/pull/8066))
+- Update rule `B005` docs ([#8028](https://github.com/astral-sh/ruff/pull/8028))
+- Update GitHub actions example in docs to use `--output-format` ([#8014](https://github.com/astral-sh/ruff/pull/8014))
+- Document `lint.preview` and `format.preview` ([#8032](https://github.com/astral-sh/ruff/pull/8032))
+- Clarify that new rules should be added to `RuleGroup::Preview`. ([#7989](https://github.com/astral-sh/ruff/pull/7989))
+
+## 0.1.0
+
+This is the first release which uses the `CHANGELOG` file. See [GitHub Releases](https://github.com/astral-sh/ruff/releases) for prior changelog entries.
+
+Read Ruff's new [versioning policy](https://docs.astral.sh/ruff/versioning/).
+
+### Breaking changes
+
+- Unsafe fixes are no longer displayed or applied without opt-in ([#7769](https://github.com/astral-sh/ruff/pull/7769))
+- Drop formatting specific rules from the default set ([#7900](https://github.com/astral-sh/ruff/pull/7900))
+- The deprecated `format` setting has been removed ([#7984](https://github.com/astral-sh/ruff/pull/7984))
+    - The `format` setting cannot be used to configure the output format, use `output-format` instead
+    - The `RUFF_FORMAT` environment variable is ignored, use `RUFF_OUTPUT_FORMAT` instead
+    - The `--format` option has been removed from `ruff check`, use `--output-format` instead
+
+### Rule changes
+
+- Extend `reimplemented-starmap` (`FURB140`) to catch calls with a single and starred argument ([#7768](https://github.com/astral-sh/ruff/pull/7768))
+- Improve cases covered by `RUF015` ([#7848](https://github.com/astral-sh/ruff/pull/7848))
+- Update `SIM15` to allow `open` followed by `close` ([#7916](https://github.com/astral-sh/ruff/pull/7916))
+- Respect `msgspec.Struct` default-copy semantics in `RUF012` ([#7786](https://github.com/astral-sh/ruff/pull/7786))
+- Add `sqlalchemy` methods to \`flake8-boolean-trap\`\` exclusion list ([#7874](https://github.com/astral-sh/ruff/pull/7874))
+- Add fix for `PLR1714` ([#7910](https://github.com/astral-sh/ruff/pull/7910))
+- Add fix for `PIE804` ([#7884](https://github.com/astral-sh/ruff/pull/7884))
+- Add fix for `PLC0208` ([#7887](https://github.com/astral-sh/ruff/pull/7887))
+- Add fix for `PYI055` ([#7886](https://github.com/astral-sh/ruff/pull/7886))
+- Update `non-pep695-type-alias` to require `--unsafe-fixes` outside of stub files ([#7836](https://github.com/astral-sh/ruff/pull/7836))
+- Improve fix message for `UP018` ([#7913](https://github.com/astral-sh/ruff/pull/7913))
+- Update `PLW3201` to support `Enum` [sunder names](https://docs.python.org/3/library/enum.html#supported-sunder-names) ([#7987](https://github.com/astral-sh/ruff/pull/7987))
+
+### Preview features
+
+- Only show warnings for empty preview selectors when enabling rules ([#7842](https://github.com/astral-sh/ruff/pull/7842))
+- Add `unnecessary-key-check` to simplify `key in dct and dct[key]` to `dct.get(key)` ([#7895](https://github.com/astral-sh/ruff/pull/7895))
+- Add `assignment-in-assert` to prevent walrus expressions in assert statements ([#7856](https://github.com/astral-sh/ruff/pull/7856))
+- \[`refurb`\] Add `single-item-membership-test` (`FURB171`) ([#7815](https://github.com/astral-sh/ruff/pull/7815))
+- \[`pylint`\] Add `and-or-ternary` (`R1706`) ([#7811](https://github.com/astral-sh/ruff/pull/7811))
+
+_New rules are added in [preview](https://docs.astral.sh/ruff/preview/)._
+
+### Configuration
+
+- Add `unsafe-fixes` setting ([#7769](https://github.com/astral-sh/ruff/pull/7769))
+- Add `extend-safe-fixes` and `extend-unsafe-fixes` for promoting and demoting fixes ([#7841](https://github.com/astral-sh/ruff/pull/7841))
+
+### CLI
+
+- Added `--unsafe-fixes` option for opt-in to display and apply unsafe fixes ([#7769](https://github.com/astral-sh/ruff/pull/7769))
+- Fix use of deprecated `--format` option in warning ([#7837](https://github.com/astral-sh/ruff/pull/7837))
+- Show changed files when running under `--check` ([#7788](https://github.com/astral-sh/ruff/pull/7788))
+- Write summary messages to stderr when fixing via stdin instead of omitting them ([#7838](https://github.com/astral-sh/ruff/pull/7838))
+- Update fix summary message in `check --diff` to include unsafe fix hints ([#7790](https://github.com/astral-sh/ruff/pull/7790))
+- Add notebook `cell` field to JSON output format ([#7664](https://github.com/astral-sh/ruff/pull/7664))
+- Rename applicability levels to `Safe`, `Unsafe`, and `Display` ([#7843](https://github.com/astral-sh/ruff/pull/7843))
+
+### Bug fixes
+
+- Fix bug where f-strings were allowed in match pattern literal ([#7857](https://github.com/astral-sh/ruff/pull/7857))
+- Fix `SIM110` with a yield in the condition ([#7801](https://github.com/astral-sh/ruff/pull/7801))
+- Preserve trailing comments in `C414` fixes ([#7775](https://github.com/astral-sh/ruff/pull/7775))
+- Check sequence type before triggering `unnecessary-enumerate` `len` suggestion ([#7781](https://github.com/astral-sh/ruff/pull/7781))
+- Use correct start location for class/function clause header ([#7802](https://github.com/astral-sh/ruff/pull/7802))
+- Fix incorrect fixes for `SIM101` ([#7798](https://github.com/astral-sh/ruff/pull/7798))
+- Format comment before parameter default correctly ([#7870](https://github.com/astral-sh/ruff/pull/7870))
+- Fix `E251` false positive inside f-strings ([#7894](https://github.com/astral-sh/ruff/pull/7894))
+- Allow bindings to be created and referenced within annotations ([#7885](https://github.com/astral-sh/ruff/pull/7885))
+- Show per-cell diffs when analyzing notebooks over `stdin` ([#7789](https://github.com/astral-sh/ruff/pull/7789))
+- Avoid curly brace escape in f-string format spec ([#7780](https://github.com/astral-sh/ruff/pull/7780))
+- Fix lexing single-quoted f-string with multi-line format spec ([#7787](https://github.com/astral-sh/ruff/pull/7787))
+- Consider nursery rules to be in-preview for `ruff rule` ([#7812](https://github.com/astral-sh/ruff/pull/7812))
+- Report precise location for invalid conversion flag ([#7809](https://github.com/astral-sh/ruff/pull/7809))
+- Visit pattern match guard as a boolean test ([#7911](https://github.com/astral-sh/ruff/pull/7911))
+- Respect `--unfixable` in `ISC` rules ([#7917](https://github.com/astral-sh/ruff/pull/7917))
+- Fix edge case with `PIE804` ([#7922](https://github.com/astral-sh/ruff/pull/7922))
+- Show custom message in `PTH118` for `Path.joinpath` with starred arguments ([#7852](https://github.com/astral-sh/ruff/pull/7852))
+- Fix false negative in `outdated-version-block` when using greater than comparisons ([#7920](https://github.com/astral-sh/ruff/pull/7920))
+- Avoid converting f-strings within Django `gettext` calls ([#7898](https://github.com/astral-sh/ruff/pull/7898))
+- Fix false positive in `PLR6301` ([#7933](https://github.com/astral-sh/ruff/pull/7933))
+- Treat type aliases as typing-only expressions e.g. resolves false positive in `TCH004` ([#7968](https://github.com/astral-sh/ruff/pull/7968))
+- Resolve `cache-dir` relative to project root ([#7962](https://github.com/astral-sh/ruff/pull/7962))
+- Respect subscripted base classes in type-checking rules e.g. resolves false positive in `TCH003` ([#7954](https://github.com/astral-sh/ruff/pull/7954))
+- Fix JSON schema limit for `line-length` ([#7883](https://github.com/astral-sh/ruff/pull/7883))
+- Fix commented-out `coalesce` keyword ([#7876](https://github.com/astral-sh/ruff/pull/7876))
+
+### Documentation
+
+- Document `reimplemented-starmap` performance effects ([#7846](https://github.com/astral-sh/ruff/pull/7846))
+- Default to following the system dark/light mode ([#7888](https://github.com/astral-sh/ruff/pull/7888))
+- Add documentation for fixes ([#7901](https://github.com/astral-sh/ruff/pull/7901))
+- Fix typo in docs of `PLR6301` ([#7831](https://github.com/astral-sh/ruff/pull/7831))
+- Update `UP038` docs to note that it results in slower code ([#7872](https://github.com/astral-sh/ruff/pull/7872))
+- crlf -> cr-lf ([#7766](https://github.com/astral-sh/ruff/pull/7766))
+- Add an example of an unsafe fix ([#7924](https://github.com/astral-sh/ruff/pull/7924))
+- Fix documented examples for `unnecessary-subscript-reversal` ([#7774](https://github.com/astral-sh/ruff/pull/7774))
+- Correct error in tuple example in ruff formatter docs ([#7822](https://github.com/astral-sh/ruff/pull/7822))
+- Add versioning policy to documentation ([#7923](https://github.com/astral-sh/ruff/pull/7923))
+- Fix invalid code in `FURB177` example ([#7832](https://github.com/astral-sh/ruff/pull/7832))
+
+### Formatter
+
+- Less scary `ruff format` message ([#7867](https://github.com/astral-sh/ruff/pull/7867))
+- Remove spaces from import statements ([#7859](https://github.com/astral-sh/ruff/pull/7859))
+- Formatter quoting for f-strings with triple quotes ([#7826](https://github.com/astral-sh/ruff/pull/7826))
+- Update `ruff_python_formatter` generate.py comment ([#7850](https://github.com/astral-sh/ruff/pull/7850))
+- Document one-call chaining deviation ([#7767](https://github.com/astral-sh/ruff/pull/7767))
+- Allow f-string modifications in line-shrinking cases ([#7818](https://github.com/astral-sh/ruff/pull/7818))
+- Add trailing comment deviation to README ([#7827](https://github.com/astral-sh/ruff/pull/7827))
+- Add trailing zero between dot and exponential ([#7956](https://github.com/astral-sh/ruff/pull/7956))
+- Force parentheses for power operations in unary expressions ([#7955](https://github.com/astral-sh/ruff/pull/7955))
+
+### Playground
+
+- Fix playground `Quick Fix` action ([#7824](https://github.com/astral-sh/ruff/pull/7824))

CODE_OF_CONDUCT.md

@@ -1,5 +1,17 @@
 # Contributor Covenant Code of Conduct
 
+- [Our Pledge](#our-pledge)
+- [Our Standards](#our-standards)
+- [Enforcement Responsibilities](#enforcement-responsibilities)
+- [Scope](#scope)
+- [Enforcement](#enforcement)
+- [Enforcement Guidelines](#enforcement-guidelines)
+    - [1. Correction](#1-correction)
+    - [2. Warning](#2-warning)
+    - [3. Temporary Ban](#3-temporary-ban)
+    - [4. Permanent Ban](#4-permanent-ban)
+- [Attribution](#attribution)
+
 ## Our Pledge
 
 We as members, contributors, and leaders pledge to make participation in our
@@ -17,24 +29,24 @@ diverse, inclusive, and healthy community.
 Examples of behavior that contributes to a positive environment for our
 community include:
 
-* Demonstrating empathy and kindness toward other people
-* Being respectful of differing opinions, viewpoints, and experiences
-* Giving and gracefully accepting constructive feedback
-* Accepting responsibility and apologizing to those affected by our mistakes,
-  and learning from the experience
-* Focusing on what is best not just for us as individuals, but for the
-  overall community
+- Demonstrating empathy and kindness toward other people
+- Being respectful of differing opinions, viewpoints, and experiences
+- Giving and gracefully accepting constructive feedback
+- Accepting responsibility and apologizing to those affected by our mistakes,
+    and learning from the experience
+- Focusing on what is best not just for us as individuals, but for the
+    overall community
 
 Examples of unacceptable behavior include:
 
-* The use of sexualized language or imagery, and sexual attention or
-  advances of any kind
-* Trolling, insulting or derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or email
-  address, without their explicit permission
-* Other conduct which could reasonably be considered inappropriate in a
-  professional setting
+- The use of sexualized language or imagery, and sexual attention or
+    advances of any kind
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or email
+    address, without their explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+    professional setting
 
 ## Enforcement Responsibilities
 
@@ -60,7 +72,7 @@ representative at an online or offline event.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
 reported to the community leaders responsible for enforcement at
-charlie.r.marsh@gmail.com.
+<charlie.r.marsh@gmail.com>.
 All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the
@@ -106,7 +118,7 @@ Violating these terms may lead to a permanent ban.
 ### 4. Permanent Ban
 
 **Community Impact**: Demonstrating a pattern of violation of community
-standards, including sustained inappropriate behavior,  harassment of an
+standards, including sustained inappropriate behavior, harassment of an
 individual, or aggression toward or disparagement of classes of individuals.
 
 **Consequence**: A permanent ban from any sort of public interaction within
@@ -115,14 +127,12 @@ the community.
 ## Attribution
 
 This Code of Conduct is adapted from the [Contributor Covenant][homepage],
-version 2.0, available at
-https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+version 2.0, available [here](https://www.contributor-covenant.org/version/2/0/code_of_conduct.html).
 
 Community Impact Guidelines were inspired by [Mozilla's code of conduct
 enforcement ladder](https://github.com/mozilla/diversity).
 
-[homepage]: https://www.contributor-covenant.org
+For answers to common questions about this code of conduct, see the [FAQ](https://www.contributor-covenant.org/faq).
+Translations are available [here](https://www.contributor-covenant.org/translations).
 
-For answers to common questions about this code of conduct, see the FAQ at
-https://www.contributor-covenant.org/faq. Translations are available at
-https://www.contributor-covenant.org/translations.
+[homepage]: https://www.contributor-covenant.org

CONTRIBUTING.md

@@ -2,12 +2,55 @@
 
 Welcome! We're happy to have you here. Thank you in advance for your contribution to Ruff.
 
-## The basics
+- [The Basics](#the-basics)
+    - [Prerequisites](#prerequisites)
+    - [Development](#development)
+    - [Project Structure](#project-structure)
+    - [Example: Adding a new lint rule](#example-adding-a-new-lint-rule)
+        - [Rule naming convention](#rule-naming-convention)
+        - [Rule testing: fixtures and snapshots](#rule-testing-fixtures-and-snapshots)
+    - [Example: Adding a new configuration option](#example-adding-a-new-configuration-option)
+- [MkDocs](#mkdocs)
+- [Release Process](#release-process)
+    - [Creating a new release](#creating-a-new-release)
+- [Ecosystem CI](#ecosystem-ci)
+- [Benchmarking and Profiling](#benchmarking-and-profiling)
+    - [CPython Benchmark](#cpython-benchmark)
+    - [Microbenchmarks](#microbenchmarks)
+        - [Benchmark-driven Development](#benchmark-driven-development)
+        - [PR Summary](#pr-summary)
+        - [Tips](#tips)
+    - [Profiling Projects](#profiling-projects)
+        - [Linux](#linux)
+        - [Mac](#mac)
+- [`cargo dev`](#cargo-dev)
+- [Subsystems](#subsystems)
+    - [Compilation Pipeline](#compilation-pipeline)
 
-Ruff welcomes contributions in the form of Pull Requests. For small changes (e.g., bug fixes), feel
-free to submit a PR. For larger changes (e.g., new lint rules, new functionality, new configuration
-options), consider submitting an [Issue](https://github.com/charliermarsh/ruff/issues) outlining
-your proposed change.
+## The Basics
+
+Ruff welcomes contributions in the form of Pull Requests.
+
+For small changes (e.g., bug fixes), feel free to submit a PR.
+
+For larger changes (e.g., new lint rules, new functionality, new configuration options), consider
+creating an [**issue**](https://github.com/astral-sh/ruff/issues) outlining your proposed change.
+You can also join us on [**Discord**](https://discord.gg/c9MhzV8aU5) to discuss your idea with the
+community. We've labeled [beginner-friendly tasks](https://github.com/astral-sh/ruff/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
+in the issue tracker, along with [bugs](https://github.com/astral-sh/ruff/issues?q=is%3Aissue+is%3Aopen+label%3Abug)
+and [improvements](https://github.com/astral-sh/ruff/issues?q=is%3Aissue+is%3Aopen+label%3Aaccepted)
+that are ready for contributions.
+
+If you're looking for a place to start, we recommend implementing a new lint rule (see:
+[_Adding a new lint rule_](#example-adding-a-new-lint-rule), which will allow you to learn from and
+pattern-match against the examples in the existing codebase. Many lint rules are inspired by
+existing Python plugins, which can be used as a reference implementation.
+
+As a concrete example: consider taking on one of the rules from the [`flake8-pyi`](https://github.com/astral-sh/ruff/issues/848)
+plugin, and looking to the originating [Python source](https://github.com/PyCQA/flake8-pyi) for
+guidance.
+
+If you have suggestions on how we might improve the contributing documentation, [let us know](https://github.com/astral-sh/ruff/discussions/5693)!
 
 ### Prerequisites
 
@@ -20,92 +63,248 @@ You'll also need [Insta](https://insta.rs/docs/) to update snapshot tests:
 cargo install cargo-insta
 ```
 
-### Development
-
-After cloning the repository, run Ruff locally with:
+and pre-commit to run some validation checks:
 
 ```shell
-cargo run resources/test/fixtures --no-cache
+pipx install pre-commit  # or `pip install pre-commit` if you have a virtualenv
 ```
 
-Prior to opening a pull request, ensure that your code has been auto-formatted, and that it passes
-both the lint and test validation checks:
+You can optionally install pre-commit hooks to automatically run the validation checks
+when making a commit:
 
 ```shell
-cargo +nightly fmt --all     # Auto-formatting...
-cargo +nightly clippy --all  # Linting...
-cargo +nightly test --all    # Testing...
+pre-commit install
+```
+
+### Development
+
+After cloning the repository, run Ruff locally from the repository root with:
+
+```shell
+cargo run -p ruff_cli -- check /path/to/file.py --no-cache
+```
+
+Prior to opening a pull request, ensure that your code has been auto-formatted,
+and that it passes both the lint and test validation checks:
+
+```shell
+cargo clippy --workspace --all-targets --all-features -- -D warnings  # Rust linting
+RUFF_UPDATE_SCHEMA=1 cargo test  # Rust testing and updating ruff.schema.json
+pre-commit run --all-files --show-diff-on-failure  # Rust and Python formatting, Markdown and Python linting, etc.
 ```
 
 These checks will run on GitHub Actions when you open your Pull Request, but running them locally
 will save you time and expedite the merge process.
 
+Note that many code changes also require updating the snapshot tests, which is done interactively
+after running `cargo test` like so:
+
+```shell
+cargo insta review
+```
+
 Your Pull Request will be reviewed by a maintainer, which may involve a few rounds of iteration
 prior to merging.
 
+### Project Structure
+
+Ruff is structured as a monorepo with a [flat crate structure](https://matklad.github.io/2021/08/22/large-rust-workspaces.html),
+such that all crates are contained in a flat `crates` directory.
+
+The vast majority of the code, including all lint rules, lives in the `ruff` crate (located at
+`crates/ruff_linter`). As a contributor, that's the crate that'll be most relevant to you.
+
+At the time of writing, the repository includes the following crates:
+
+- `crates/ruff_linter`: library crate containing all lint rules and the core logic for running them.
+    If you're working on a rule, this is the crate for you.
+- `crates/ruff_benchmark`: binary crate for running micro-benchmarks.
+- `crates/ruff_cache`: library crate for caching lint results.
+- `crates/ruff_cli`: binary crate containing Ruff's command-line interface.
+- `crates/ruff_dev`: binary crate containing utilities used in the development of Ruff itself (e.g.,
+    `cargo dev generate-all`), see the [`cargo dev`](#cargo-dev) section below.
+- `crates/ruff_diagnostics`: library crate for the rule-independent abstractions in the lint
+    diagnostics APIs.
+- `crates/ruff_formatter`: library crate for language agnostic code formatting logic based on an
+    intermediate representation. The backend for `ruff_python_formatter`.
+- `crates/ruff_index`: library crate inspired by `rustc_index`.
+- `crates/ruff_macros`: proc macro crate containing macros used by Ruff.
+- `crates/ruff_notebook`: library crate for parsing and manipulating Jupyter notebooks.
+- `crates/ruff_python_ast`: library crate containing Python-specific AST types and utilities.
+- `crates/ruff_python_codegen`: library crate containing utilities for generating Python source code.
+- `crates/ruff_python_formatter`: library crate implementing the Python formatter. Emits an
+    intermediate representation for each node, which `ruff_formatter` prints based on the configured
+    line length.
+- `crates/ruff_python_semantic`: library crate containing Python-specific semantic analysis logic,
+    including Ruff's semantic model. Used to resolve queries like "What import does this variable
+    refer to?"
+- `crates/ruff_python_stdlib`: library crate containing Python-specific standard library data, e.g.
+    the names of all built-in exceptions and which standard library types are immutable.
+- `crates/ruff_python_trivia`: library crate containing Python-specific trivia utilities (e.g.,
+    for analyzing indentation, newlines, etc.).
+- `crates/ruff_python_parser`: library crate containing the Python parser.
+- `crates/ruff_wasm`: library crate for exposing Ruff as a WebAssembly module. Powers the
+    [Ruff Playground](https://play.ruff.rs/).
+
 ### Example: Adding a new lint rule
 
-There are four phases to adding a new lint rule:
+At a high level, the steps involved in adding a new lint rule are as follows:
 
-1. Define the rule in `src/checks.rs`.
-2. Define the _logic_ for triggering the rule in `src/check_ast.rs` (for AST-based checks),
-   `src/check_tokens.rs` (for token-based checks), or `src/check_lines.rs` (for text-based checks).
-3. Add a test fixture.
-4. Update the generated files (documentation and generated code).
+1. Determine a name for the new rule as per our [rule naming convention](#rule-naming-convention)
+    (e.g., `AssertFalse`, as in, "allow `assert False`").
 
-To define the rule, open up `src/checks.rs`. You'll need to define both a `CheckCode` and
-`CheckKind`. As an example, you can grep for `E402` and `ModuleImportNotAtTopOfFile`, and follow the
-pattern implemented therein.
+1. Create a file for your rule (e.g., `crates/ruff_linter/src/rules/flake8_bugbear/rules/assert_false.rs`).
 
-To trigger the rule, you'll likely want to augment the logic in `src/check_ast.rs`, which defines
-the Python AST visitor, responsible for iterating over the abstract syntax tree and collecting
-lint-rule violations as it goes. If you need to inspect the AST, you can run `cargo dev print-ast`
-with a Python file. Grep for the `Check::new` invocations to understand how other, similar rules
-are implemented.
+1. In that file, define a violation struct (e.g., `pub struct AssertFalse`). You can grep for
+    `#[violation]` to see examples.
 
-To add a test fixture, create a file under `resources/test/fixtures`, named to match the `CheckCode`
-you defined earlier (e.g., `E402.py`). This file should contain a variety of violations and
-non-violations designed to evaluate and demonstrate the behavior of your lint rule. Run Ruff locally
-with (e.g.) `cargo run resources/test/fixtures/E402.py --no-cache`. Once you're satisfied with the
-output, codify the behavior as a snapshot test by adding a new `testcase` macro to the `mod tests`
-section of `src/linter.rs`, like so:
+1. In that file, define a function that adds the violation to the diagnostic list as appropriate
+    (e.g., `pub(crate) fn assert_false`) based on whatever inputs are required for the rule (e.g.,
+    an `ast::StmtAssert` node).
 
-```rust
-#[test_case(CheckCode::A001, Path::new("A001.py"); "A001")]
-...
-```
+1. Define the logic for invoking the diagnostic in `crates/ruff_linter/src/checkers/ast/analyze` (for
+    AST-based rules), `crates/ruff_linter/src/checkers/tokens.rs` (for token-based rules),
+    `crates/ruff_linter/src/checkers/physical_lines.rs` (for text-based rules),
+    `crates/ruff_linter/src/checkers/filesystem.rs` (for filesystem-based rules), etc. For AST-based rules,
+    you'll likely want to modify `analyze/statement.rs` (if your rule is based on analyzing
+    statements, like imports) or `analyze/expression.rs` (if your rule is based on analyzing
+    expressions, like function calls).
 
-Then, run `cargo test`. Your test will fail, but you'll be prompted to follow-up with
-`cargo insta review`. Accept the generated snapshot, then commit the snapshot file alongside the
-rest of your changes.
+1. Map the violation struct to a rule code in `crates/ruff_linter/src/codes.rs` (e.g., `B011`). New rules
+    should be added in `RuleGroup::Preview`.
 
-Finally, to update the documentation, run `cargo dev generate-rules-table` from the repo root. To
-update the generated prefix map, run `cargo dev generate-check-code-prefix`. Both of these commands
-should be run whenever a new check is added to the codebase.
+1. Add proper [testing](#rule-testing-fixtures-and-snapshots) for your rule.
+
+1. Update the generated files (documentation and generated code).
+
+To trigger the violation, you'll likely want to augment the logic in `crates/ruff_linter/src/checkers/ast.rs`
+to call your new function at the appropriate time and with the appropriate inputs. The `Checker`
+defined therein is a Python AST visitor, which iterates over the AST, building up a semantic model,
+and calling out to lint rule analyzer functions as it goes.
+
+If you need to inspect the AST, you can run `cargo dev print-ast` with a Python file. Grep
+for the `Diagnostic::new` invocations to understand how other, similar rules are implemented.
+
+Once you're satisfied with your code, add tests for your rule. See [rule testing](#rule-testing-fixtures-and-snapshots)
+for more details.
+
+Finally, regenerate the documentation and other generated assets (like our JSON Schema) with:
+`cargo dev generate-all`.
+
+#### Rule naming convention
+
+Like Clippy, Ruff's rule names should make grammatical and logical sense when read as "allow
+${rule}" or "allow ${rule} items", as in the context of suppression comments.
+
+For example, `AssertFalse` fits this convention: it flags `assert False` statements, and so a
+suppression comment would be framed as "allow `assert False`".
+
+As such, rule names should...
+
+- Highlight the pattern that is being linted against, rather than the preferred alternative.
+    For example, `AssertFalse` guards against `assert False` statements.
+
+- _Not_ contain instructions on how to fix the violation, which instead belong in the rule
+    documentation and the `fix_title`.
+
+- _Not_ contain a redundant prefix, like `Disallow` or `Banned`, which are already implied by the
+    convention.
+
+When re-implementing rules from other linters, we prioritize adhering to this convention over
+preserving the original rule name.
+
+#### Rule testing: fixtures and snapshots
+
+To test rules, Ruff uses snapshots of Ruff's output for a given file (fixture). Generally, there
+will be one file per rule (e.g., `E402.py`), and each file will contain all necessary examples of
+both violations and non-violations. `cargo insta review` will generate a snapshot file containing
+Ruff's output for each fixture, which you can then commit alongside your changes.
+
+Once you've completed the code for the rule itself, you can define tests with the following steps:
+
+1. Add a Python file to `crates/ruff_linter/resources/test/fixtures/[linter]` that contains the code you
+    want to test. The file name should match the rule name (e.g., `E402.py`), and it should include
+    examples of both violations and non-violations.
+
+1. Run Ruff locally against your file and verify the output is as expected. Once you're satisfied
+    with the output (you see the violations you expect, and no others), proceed to the next step.
+    For example, if you're adding a new rule named `E402`, you would run:
+
+    ```shell
+    cargo run -p ruff_cli -- check crates/ruff_linter/resources/test/fixtures/pycodestyle/E402.py --no-cache --select E402
+    ```
+
+    **Note:** Only a subset of rules are enabled by default. When testing a new rule, ensure that
+    you activate it by adding `--select ${rule_code}` to the command.
+
+1. Add the test to the relevant `crates/ruff_linter/src/rules/[linter]/mod.rs` file. If you're contributing
+    a rule to a pre-existing set, you should be able to find a similar example to pattern-match
+    against. If you're adding a new linter, you'll need to create a new `mod.rs` file (see,
+    e.g., `crates/ruff_linter/src/rules/flake8_bugbear/mod.rs`)
+
+1. Run `cargo test`. Your test will fail, but you'll be prompted to follow-up
+    with `cargo insta review`. Run `cargo insta review`, review and accept the generated snapshot,
+    then commit the snapshot file alongside the rest of your changes.
+
+1. Run `cargo test` again to ensure that your test passes.
 
 ### Example: Adding a new configuration option
 
-Ruff's user-facing settings live in two places: first, the command-line options defined with
-[clap](https://docs.rs/clap/latest/clap/) via the `Cli` struct in `src/main.rs`; and second, the
-`Config` struct defined `src/pyproject.rs`, which is responsible for extracting user-defined
-settings from a `pyproject.toml` file.
+Ruff's user-facing settings live in a few different places.
 
-Ultimately, these two sources of configuration are merged into the `Settings` struct defined
-in `src/settings.rs`, which is then threaded through the codebase.
+First, the command-line options are defined via the `Args` struct in `crates/ruff_cli/src/args.rs`.
 
-To add a new configuration option, you'll likely want to _both_ add a CLI option to `src/main.rs`
-_and_ a `pyproject.toml` parameter to `src/pyproject.rs`. If you want to pattern-match against an
-existing example, grep for `dummy_variable_rgx`, which defines a regular expression to match against
-acceptable unused variables (e.g., `_`).
+Second, the `pyproject.toml` options are defined in `crates/ruff_workspace/src/options.rs` (via the
+`Options` struct), `crates/ruff_workspace/src/configuration.rs` (via the `Configuration` struct),
+and `crates/ruff_workspace/src/settings.rs` (via the `Settings` struct), which then includes
+the `LinterSettings` struct as a field.
 
-If the new plugin's configuration should be cached between runs, you'll need to add it to the
-`Hash` implementation for `Settings` in `src/settings/mod.rs`.
+These represent, respectively: the schema used to parse the `pyproject.toml` file; an internal,
+intermediate representation; and the final, internal representation used to power Ruff.
 
-You may also want to add the new configuration option to the `flake8-to-ruff` tool, which is
-responsible for converting `flake8` configuration files to Ruff's TOML format. This logic
-lives in `flake8_to_ruff/src/converter.rs`.
+To add a new configuration option, you'll likely want to modify these latter few files (along with
+`arg.rs`, if appropriate). If you want to pattern-match against an existing example, grep for
+`dummy_variable_rgx`, which defines a regular expression to match against acceptable unused
+variables (e.g., `_`).
 
-## Release process
+Note that plugin-specific configuration options are defined in their own modules (e.g.,
+`Settings` in `crates/ruff_linter/src/flake8_unused_arguments/settings.rs` coupled with
+`Flake8UnusedArgumentsOptions` in `crates/ruff_workspace/src/options.rs`).
+
+Finally, regenerate the documentation and generated code with `cargo dev generate-all`.
+
+## MkDocs
+
+To preview any changes to the documentation locally:
+
+1. Install the [Rust toolchain](https://www.rust-lang.org/tools/install).
+
+1. Install MkDocs and Material for MkDocs with:
+
+    ```shell
+    pip install -r docs/requirements.txt
+    ```
+
+1. Generate the MkDocs site with:
+
+    ```shell
+    python scripts/generate_mkdocs.py
+    ```
+
+1. Run the development server with:
+
+    ```shell
+    # For contributors.
+    mkdocs serve -f mkdocs.generated.yml
+
+    # For members of the Astral org, which has access to MkDocs Insiders via sponsorship.
+    mkdocs serve -f mkdocs.insiders.yml
+    ```
+
+The documentation should then be available locally at
+[http://127.0.0.1:8000/docs/](http://127.0.0.1:8000/docs/).
+
+## Release Process
 
 As of now, Ruff has an ad hoc release process: releases are cut with high frequency via GitHub
 Actions, which automatically generates the appropriate wheels across architectures and publishes
@@ -113,3 +312,582 @@ them to [PyPI](https://pypi.org/project/ruff/).
 
 Ruff follows the [semver](https://semver.org/) versioning standard. However, as pre-1.0 software,
 even patch releases may contain [non-backwards-compatible changes](https://semver.org/#spec-item-4).
+
+### Creating a new release
+
+We use an experimental in-house tool for managing releases.
+
+1. Install `rooster`: `pip install git+https://github.com/zanieb/rooster@main`
+1. Run `rooster release`; this command will:
+    - Generate a changelog entry in `CHANGELOG.md`
+    - Update versions in `pyproject.toml` and `Cargo.toml`
+    - Update references to versions in the `README.md` and documentation
+1. The changelog should then be editorialized for consistency
+    - Often labels will be missing from pull requests they will need to be manually organized into the proper section
+    - Changes should be edited to be user-facing descriptions, avoiding internal details
+1. Highlight any breaking changes in `BREAKING_CHANGES.md`
+1. Create a pull request with the changelog and version updates
+1. Merge the PR
+1. Run the release workflow with the version number (without starting `v`) as input. Make sure
+    main has your merged PR as last commit
+1. The release workflow will do the following:
+    1. Build all the assets. If this fails (even though we tested in step 4), we haven't tagged or
+        uploaded anything, you can restart after pushing a fix.
+    1. Upload to PyPI.
+    1. Create and push the Git tag (as extracted from `pyproject.toml`). We create the Git tag only
+        after building the wheels and uploading to PyPI, since we can't delete or modify the tag ([#4468](https://github.com/charliermarsh/ruff/issues/4468)).
+    1. Attach artifacts to draft GitHub release
+    1. Trigger downstream repositories. This can fail non-catastrophically, as we can run any
+        downstream jobs manually if needed.
+1. Publish the GitHub release
+    1. Open the draft release in the GitHub release section
+    1. Copy the changelog for the release into the GitHub release
+        - See previous releases for formatting of section headers
+    1. Generate the contributor list with `rooster contributors` and add to the release notes
+1. If needed, [update the schemastore](https://github.com/charliermarsh/ruff/blob/main/scripts/update_schemastore.py)
+1. If needed, update the `ruff-lsp` and `ruff-vscode` repositories.
+
+## Ecosystem CI
+
+GitHub Actions will run your changes against a number of real-world projects from GitHub and
+report on any linter or formatter differences. You can also run those checks locally via:
+
+```shell
+pip install -e ./python/ruff-ecosystem
+ruff-ecosystem check ruff "./target/debug/ruff"
+ruff-ecosystem format ruff "./target/debug/ruff"
+```
+
+See the [ruff-ecosystem package](https://github.com/astral-sh/ruff/tree/main/python/ruff-ecosystem) for more details.
+
+## Benchmarking and Profiling
+
+We have several ways of benchmarking and profiling Ruff:
+
+- Our main performance benchmark comparing Ruff with other tools on the CPython codebase
+- Microbenchmarks which the linter or the formatter on individual files. There run on pull requests.
+- Profiling the linter on either the microbenchmarks or entire projects
+
+### CPython Benchmark
+
+First, clone [CPython](https://github.com/python/cpython). It's a large and diverse Python codebase,
+which makes it a good target for benchmarking.
+
+```shell
+git clone --branch 3.10 https://github.com/python/cpython.git crates/ruff_linter/resources/test/cpython
+```
+
+To benchmark the release build:
+
+```shell
+cargo build --release && hyperfine --warmup 10 \
+  "./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache -e" \
+  "./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ -e"
+
+Benchmark 1: ./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache
+  Time (mean ± σ):     293.8 ms ±   3.2 ms    [User: 2384.6 ms, System: 90.3 ms]
+  Range (min … max):   289.9 ms … 301.6 ms    10 runs
+
+Benchmark 2: ./target/release/ruff ./crates/ruff_linter/resources/test/cpython/
+  Time (mean ± σ):      48.0 ms ±   3.1 ms    [User: 65.2 ms, System: 124.7 ms]
+  Range (min … max):    45.0 ms …  66.7 ms    62 runs
+
+Summary
+  './target/release/ruff ./crates/ruff_linter/resources/test/cpython/' ran
+    6.12 ± 0.41 times faster than './target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache'
+```
+
+To benchmark against the ecosystem's existing tools:
+
+```shell
+hyperfine --ignore-failure --warmup 5 \
+  "./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache" \
+  "pyflakes crates/ruff_linter/resources/test/cpython" \
+  "autoflake --recursive --expand-star-imports --remove-all-unused-imports --remove-unused-variables --remove-duplicate-keys resources/test/cpython" \
+  "pycodestyle crates/ruff_linter/resources/test/cpython" \
+  "flake8 crates/ruff_linter/resources/test/cpython"
+
+Benchmark 1: ./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache
+  Time (mean ± σ):     294.3 ms ±   3.3 ms    [User: 2467.5 ms, System: 89.6 ms]
+  Range (min … max):   291.1 ms … 302.8 ms    10 runs
+
+  Warning: Ignoring non-zero exit code.
+
+Benchmark 2: pyflakes crates/ruff_linter/resources/test/cpython
+  Time (mean ± σ):     15.786 s ±  0.143 s    [User: 15.560 s, System: 0.214 s]
+  Range (min … max):   15.640 s … 16.157 s    10 runs
+
+  Warning: Ignoring non-zero exit code.
+
+Benchmark 3: autoflake --recursive --expand-star-imports --remove-all-unused-imports --remove-unused-variables --remove-duplicate-keys resources/test/cpython
+  Time (mean ± σ):      6.175 s ±  0.169 s    [User: 54.102 s, System: 1.057 s]
+  Range (min … max):    5.950 s …  6.391 s    10 runs
+
+Benchmark 4: pycodestyle crates/ruff_linter/resources/test/cpython
+  Time (mean ± σ):     46.921 s ±  0.508 s    [User: 46.699 s, System: 0.202 s]
+  Range (min … max):   46.171 s … 47.863 s    10 runs
+
+  Warning: Ignoring non-zero exit code.
+
+Benchmark 5: flake8 crates/ruff_linter/resources/test/cpython
+  Time (mean ± σ):     12.260 s ±  0.321 s    [User: 102.934 s, System: 1.230 s]
+  Range (min … max):   11.848 s … 12.933 s    10 runs
+
+  Warning: Ignoring non-zero exit code.
+
+Summary
+  './target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache' ran
+   20.98 ± 0.62 times faster than 'autoflake --recursive --expand-star-imports --remove-all-unused-imports --remove-unused-variables --remove-duplicate-keys resources/test/cpython'
+   41.66 ± 1.18 times faster than 'flake8 crates/ruff_linter/resources/test/cpython'
+   53.64 ± 0.77 times faster than 'pyflakes crates/ruff_linter/resources/test/cpython'
+  159.43 ± 2.48 times faster than 'pycodestyle crates/ruff_linter/resources/test/cpython'
+```
+
+To benchmark a subset of rules, e.g. `LineTooLong` and `DocLineTooLong`:
+
+```shell
+cargo build --release && hyperfine --warmup 10 \
+  "./target/release/ruff ./crates/ruff_linter/resources/test/cpython/ --no-cache -e --select W505,E501"
+```
+
+You can run `poetry install` from `./scripts/benchmarks` to create a working environment for the
+above. All reported benchmarks were computed using the versions specified by
+`./scripts/benchmarks/pyproject.toml` on Python 3.11.
+
+To benchmark Pylint, remove the following files from the CPython repository:
+
+```shell
+rm Lib/test/bad_coding.py \
+  Lib/test/bad_coding2.py \
+  Lib/test/bad_getattr.py \
+  Lib/test/bad_getattr2.py \
+  Lib/test/bad_getattr3.py \
+  Lib/test/badcert.pem \
+  Lib/test/badkey.pem \
+  Lib/test/badsyntax_3131.py \
+  Lib/test/badsyntax_future10.py \
+  Lib/test/badsyntax_future3.py \
+  Lib/test/badsyntax_future4.py \
+  Lib/test/badsyntax_future5.py \
+  Lib/test/badsyntax_future6.py \
+  Lib/test/badsyntax_future7.py \
+  Lib/test/badsyntax_future8.py \
+  Lib/test/badsyntax_future9.py \
+  Lib/test/badsyntax_pep3120.py \
+  Lib/test/test_asyncio/test_runners.py \
+  Lib/test/test_copy.py \
+  Lib/test/test_inspect.py \
+  Lib/test/test_typing.py
+```
+
+Then, from `crates/ruff_linter/resources/test/cpython`, run: `time pylint -j 0 -E $(git ls-files '*.py')`. This
+will execute Pylint with maximum parallelism and only report errors.
+
+To benchmark Pyupgrade, run the following from `crates/ruff_linter/resources/test/cpython`:
+
+```shell
+hyperfine --ignore-failure --warmup 5 --prepare "git reset --hard HEAD" \
+  "find . -type f -name \"*.py\" | xargs -P 0 pyupgrade --py311-plus"
+
+Benchmark 1: find . -type f -name "*.py" | xargs -P 0 pyupgrade --py311-plus
+  Time (mean ± σ):     30.119 s ±  0.195 s    [User: 28.638 s, System: 0.390 s]
+  Range (min … max):   29.813 s … 30.356 s    10 runs
+```
+
+### Microbenchmarks
+
+The `ruff_benchmark` crate benchmarks the linter and the formatter on individual files.
+
+You can run the benchmarks with
+
+```shell
+cargo benchmark
+```
+
+#### Benchmark-driven Development
+
+Ruff uses [Criterion.rs](https://bheisler.github.io/criterion.rs/book/) for benchmarks. You can use
+`--save-baseline=<name>` to store an initial baseline benchmark (e.g. on `main`) and then use
+`--benchmark=<name>` to compare against that benchmark. Criterion will print a message telling you
+if the benchmark improved/regressed compared to that baseline.
+
+```shell
+# Run once on your "baseline" code
+cargo benchmark --save-baseline=main
+
+# Then iterate with
+cargo benchmark --baseline=main
+```
+
+#### PR Summary
+
+You can use `--save-baseline` and `critcmp` to get a pretty comparison between two recordings.
+This is useful to illustrate the improvements of a PR.
+
+```shell
+# On main
+cargo benchmark --save-baseline=main
+
+# After applying your changes
+cargo benchmark --save-baseline=pr
+
+critcmp main pr
+```
+
+You must install [`critcmp`](https://github.com/BurntSushi/critcmp) for the comparison.
+
+```bash
+cargo install critcmp
+```
+
+#### Tips
+
+- Use `cargo benchmark <filter>` to only run specific benchmarks. For example: `cargo benchmark linter/pydantic`
+    to only run the pydantic tests.
+- Use `cargo benchmark --quiet` for a more cleaned up output (without statistical relevance)
+- Use `cargo benchmark --quick` to get faster results (more prone to noise)
+
+### Profiling Projects
+
+You can either use the microbenchmarks from above or a project directory for benchmarking. There
+are a lot of profiling tools out there,
+[The Rust Performance Book](https://nnethercote.github.io/perf-book/profiling.html) lists some
+examples.
+
+#### Linux
+
+Install `perf` and build `ruff_benchmark` with the `release-debug` profile and then run it with perf
+
+```shell
+cargo bench -p ruff_benchmark --no-run --profile=release-debug && perf record --call-graph dwarf -F 9999 cargo bench -p ruff_benchmark --profile=release-debug -- --profile-time=1
+```
+
+You can also use the `ruff_dev` launcher to run `ruff check` multiple times on a repository to
+gather enough samples for a good flamegraph (change the 999, the sample rate, and the 30, the number
+of checks, to your liking)
+
+```shell
+cargo build --bin ruff_dev --profile=release-debug
+perf record -g -F 999 target/release-debug/ruff_dev repeat --repeat 30 --exit-zero --no-cache path/to/cpython > /dev/null
+```
+
+Then convert the recorded profile
+
+```shell
+perf script -F +pid > /tmp/test.perf
+```
+
+You can now view the converted file with [firefox profiler](https://profiler.firefox.com/), with a
+more in-depth guide [here](https://profiler.firefox.com/docs/#/./guide-perf-profiling)
+
+An alternative is to convert the perf data to `flamegraph.svg` using
+[flamegraph](https://github.com/flamegraph-rs/flamegraph) (`cargo install flamegraph`):
+
+```shell
+flamegraph --perfdata perf.data --no-inline
+```
+
+#### Mac
+
+Install [`cargo-instruments`](https://crates.io/crates/cargo-instruments):
+
+```shell
+cargo install cargo-instruments
+```
+
+Then run the profiler with
+
+```shell
+cargo instruments -t time --bench linter --profile release-debug -p ruff_benchmark -- --profile-time=1
+```
+
+- `-t`: Specifies what to profile. Useful options are `time` to profile the wall time and `alloc`
+    for profiling the allocations.
+- You may want to pass an additional filter to run a single test file
+
+Otherwise, follow the instructions from the linux section.
+
+## `cargo dev`
+
+`cargo dev` is a shortcut for `cargo run --package ruff_dev --bin ruff_dev`. You can run some useful
+utils with it:
+
+- `cargo dev print-ast <file>`: Print the AST of a python file using the
+    [RustPython parser](https://github.com/astral-sh/RustPython-Parser/tree/main/parser) that is
+    mainly used in Ruff. For `if True: pass # comment`, you can see the syntax tree, the byte offsets
+    for start and stop of each node and also how the `:` token, the comment and whitespace are not
+    represented anymore:
+
+```text
+[
+    If(
+        StmtIf {
+            range: 0..13,
+            test: Constant(
+                ExprConstant {
+                    range: 3..7,
+                    value: Bool(
+                        true,
+                    ),
+                    kind: None,
+                },
+            ),
+            body: [
+                Pass(
+                    StmtPass {
+                        range: 9..13,
+                    },
+                ),
+            ],
+            orelse: [],
+        },
+    ),
+]
+```
+
+- `cargo dev print-tokens <file>`: Print the tokens that the AST is built upon. Again for
+    `if True: pass # comment`:
+
+```text
+0 If 2
+3 True 7
+7 Colon 8
+9 Pass 13
+14 Comment(
+    "# comment",
+) 23
+23 Newline 24
+```
+
+- `cargo dev print-cst <file>`: Print the CST of a python file using
+    [LibCST](https://github.com/Instagram/LibCST), which is used in addition to the RustPython parser
+    in Ruff. E.g. for `if True: pass # comment` everything including the whitespace is represented:
+
+```text
+Module {
+    body: [
+        Compound(
+            If(
+                If {
+                    test: Name(
+                        Name {
+                            value: "True",
+                            lpar: [],
+                            rpar: [],
+                        },
+                    ),
+                    body: SimpleStatementSuite(
+                        SimpleStatementSuite {
+                            body: [
+                                Pass(
+                                    Pass {
+                                        semicolon: None,
+                                    },
+                                ),
+                            ],
+                            leading_whitespace: SimpleWhitespace(
+                                " ",
+                            ),
+                            trailing_whitespace: TrailingWhitespace {
+                                whitespace: SimpleWhitespace(
+                                    " ",
+                                ),
+                                comment: Some(
+                                    Comment(
+                                        "# comment",
+                                    ),
+                                ),
+                                newline: Newline(
+                                    None,
+                                    Real,
+                                ),
+                            },
+                        },
+                    ),
+                    orelse: None,
+                    leading_lines: [],
+                    whitespace_before_test: SimpleWhitespace(
+                        " ",
+                    ),
+                    whitespace_after_test: SimpleWhitespace(
+                        "",
+                    ),
+                    is_elif: false,
+                },
+            ),
+        ),
+    ],
+    header: [],
+    footer: [],
+    default_indent: "    ",
+    default_newline: "\n",
+    has_trailing_newline: true,
+    encoding: "utf-8",
+}
+```
+
+- `cargo dev generate-all`: Update `ruff.schema.json`, `docs/configuration.md` and `docs/rules`.
+    You can also set `RUFF_UPDATE_SCHEMA=1` to update `ruff.schema.json` during `cargo test`.
+- `cargo dev generate-cli-help`, `cargo dev generate-docs` and `cargo dev generate-json-schema`:
+    Update just `docs/configuration.md`, `docs/rules` and `ruff.schema.json` respectively.
+- `cargo dev generate-options`: Generate a markdown-compatible table of all `pyproject.toml`
+    options. Used for <https://docs.astral.sh/ruff/settings/>.
+- `cargo dev generate-rules-table`: Generate a markdown-compatible table of all rules. Used for <https://docs.astral.sh/ruff/rules/>.
+- `cargo dev round-trip <python file or jupyter notebook>`: Read a Python file or Jupyter Notebook,
+    parse it, serialize the parsed representation and write it back. Used to check how good our
+    representation is so that fixes don't rewrite irrelevant parts of a file.
+- `cargo dev format_dev`: See ruff_python_formatter README.md
+
+## Subsystems
+
+### Compilation Pipeline
+
+If we view Ruff as a compiler, in which the inputs are paths to Python files and the outputs are
+diagnostics, then our current compilation pipeline proceeds as follows:
+
+1. **File discovery**: Given paths like `foo/`, locate all Python files in any specified subdirectories, taking into account our hierarchical settings system and any `exclude` options.
+
+1. **Package resolution**: Determine the "package root" for every file by traversing over its parent directories and looking for `__init__.py` files.
+
+1. **Cache initialization**: For every "package root", initialize an empty cache.
+
+1. **Analysis**: For every file, in parallel:
+
+    1. **Cache read**: If the file is cached (i.e., its modification timestamp hasn't changed since it was last analyzed), short-circuit, and return the cached diagnostics.
+
+    1. **Tokenization**: Run the lexer over the file to generate a token stream.
+
+    1. **Indexing**: Extract metadata from the token stream, such as: comment ranges, `# noqa` locations, `# isort: off` locations, "doc lines", etc.
+
+    1. **Token-based rule evaluation**: Run any lint rules that are based on the contents of the token stream (e.g., commented-out code).
+
+    1. **Filesystem-based rule evaluation**: Run any lint rules that are based on the contents of the filesystem (e.g., lack of `__init__.py` file in a package).
+
+    1. **Logical line-based rule evaluation**: Run any lint rules that are based on logical lines (e.g., stylistic rules).
+
+    1. **Parsing**: Run the parser over the token stream to produce an AST. (This consumes the token stream, so anything that relies on the token stream needs to happen before parsing.)
+
+    1. **AST-based rule evaluation**: Run any lint rules that are based on the AST. This includes the vast majority of lint rules. As part of this step, we also build the semantic model for the current file as we traverse over the AST. Some lint rules are evaluated eagerly, as we iterate over the AST, while others are evaluated in a deferred manner (e.g., unused imports, since we can't determine whether an import is unused until we've finished analyzing the entire file), after we've finished the initial traversal.
+
+    1. **Import-based rule evaluation**: Run any lint rules that are based on the module's imports (e.g., import sorting). These could, in theory, be included in the AST-based rule evaluation phase — they're just separated for simplicity.
+
+    1. **Physical line-based rule evaluation**: Run any lint rules that are based on physical lines (e.g., line-length).
+
+    1. **Suppression enforcement**: Remove any violations that are suppressed via `# noqa` directives or `per-file-ignores`.
+
+    1. **Cache write**: Write the generated diagnostics to the package cache using the file as a key.
+
+1. **Reporting**: Print diagnostics in the specified format (text, JSON, etc.), to the specified output channel (stdout, a file, etc.).
+
+### Import Categorization
+
+To understand Ruff's import categorization system, we first need to define two concepts:
+
+- "Project root": The directory containing the `pyproject.toml`, `ruff.toml`, or `.ruff.toml` file,
+    discovered by identifying the "closest" such directory for each Python file. (If you're running
+    via `ruff --config /path/to/pyproject.toml`, then the current working directory is used as the
+    "project root".)
+- "Package root": The top-most directory defining the Python package that includes a given Python
+    file. To find the package root for a given Python file, traverse up its parent directories until
+    you reach a parent directory that doesn't contain an `__init__.py` file (and isn't marked as
+    a [namespace package](https://docs.astral.sh/ruff/settings/#namespace-packages)); take the directory
+    just before that, i.e., the first directory in the package.
+
+For example, given:
+
+```text
+my_project
+├── pyproject.toml
+└── src
+    └── foo
+        ├── __init__.py
+        └── bar
+            ├── __init__.py
+            └── baz.py
+```
+
+Then when analyzing `baz.py`, the project root would be the top-level directory (`./my_project`),
+and the package root would be `./my_project/src/foo`.
+
+#### Project root
+
+The project root does not have a significant impact beyond that all relative paths within the loaded
+configuration file are resolved relative to the project root.
+
+For example, to indicate that `bar` above is a namespace package (it isn't, but let's run with it),
+the `pyproject.toml` would list `namespace-packages = ["./src/bar"]`, which would resolve
+to `my_project/src/bar`.
+
+The same logic applies when providing a configuration file via `--config`. In that case, the
+_current working directory_ is used as the project root, and so all paths in that configuration file
+are resolved relative to the current working directory. (As a general rule, we want to avoid relying
+on the current working directory as much as possible, to ensure that Ruff exhibits the same behavior
+regardless of where and how you invoke it — but that's hard to avoid in this case.)
+
+Additionally, if a `pyproject.toml` file _extends_ another configuration file, Ruff will still use
+the directory containing that `pyproject.toml` file as the project root. For example, if
+`./my_project/pyproject.toml` contains:
+
+```toml
+[tool.ruff]
+extend = "/path/to/pyproject.toml"
+```
+
+Then Ruff will use `./my_project` as the project root, even though the configuration file extends
+`/path/to/pyproject.toml`. As such, if the configuration file at `/path/to/pyproject.toml` contains
+any relative paths, they will be resolved relative to `./my_project`.
+
+If a project uses nested configuration files, then Ruff would detect multiple project roots, one for
+each configuration file.
+
+#### Package root
+
+The package root is used to determine a file's "module path". Consider, again, `baz.py`. In that
+case, `./my_project/src/foo` was identified as the package root, so the module path for `baz.py`
+would resolve to  `foo.bar.baz` — as computed by taking the relative path from the package root
+(inclusive of the root itself). The module path can be thought of as "the path you would use to
+import the module" (e.g., `import foo.bar.baz`).
+
+The package root and module path are used to, e.g., convert relative to absolute imports, and for
+import categorization, as described below.
+
+#### Import categorization
+
+When sorting and formatting import blocks, Ruff categorizes every import into one of five
+categories:
+
+1. **"Future"**: the import is a `__future__` import. That's easy: just look at the name of the
+    imported module!
+1. **"Standard library"**: the import comes from the Python standard library (e.g., `import os`).
+    This is easy too: we include a list of all known standard library modules in Ruff itself, so it's
+    a simple lookup.
+1. **"Local folder"**: the import is a relative import (e.g., `from .foo import bar`). This is easy
+    too: just check if the import includes a `level` (i.e., a dot-prefix).
+1. **"First party"**: the import is part of the current project. (More on this below.)
+1. **"Third party"**: everything else.
+
+The real challenge lies in determining whether an import is first-party — everything else is either
+trivial, or (as in the case of third-party) merely defined as "not first-party".
+
+There are three ways in which an import can be categorized as "first-party":
+
+1. **Explicit settings**: the import is marked as such via the `known-first-party` setting. (This
+    should generally be seen as an escape hatch.)
+1. **Same-package**: the imported module is in the same package as the current file. This gets back
+    to the importance of the "package root" and the file's "module path". Imagine that we're
+    analyzing `baz.py` above. If `baz.py` contains any imports that appear to come from the `foo`
+    package (e.g., `from foo import bar` or `import foo.bar`), they'll be classified as first-party
+    automatically. This check is as simple as comparing the first segment of the current file's
+    module path to the first segment of the import.
+1. **Source roots**: Ruff supports a `[src](https://docs.astral.sh/ruff/settings/#src)` setting, which
+    sets the directories to scan when identifying first-party imports. The algorithm is
+    straightforward: given an import, like `import foo`, iterate over the directories enumerated in
+    the `src` setting and, for each directory, check for the existence of a subdirectory `foo` or a
+    file `foo.py`.
+
+By default, `src` is set to the project root. In the above example, we'd want to set
+`src = ["./src"]` to ensure that we locate `./my_project/src/foo` and thus categorize `import foo`
+as first-party in `baz.py`. In practice, for this limited example, setting `src = ["./src"]` is
+unnecessary, as all imports within `./my_project/src/foo` would be categorized as first-party via
+the same-package heuristic; but if your project contains multiple packages, you'll want to set `src`
+explicitly.

Cargo.toml

@@ -1,83 +1,63 @@
 [workspace]
-members = [
-  "flake8_to_ruff",
-  "ruff_dev",
-]
+members = ["crates/*"]
+resolver = "2"
 
-[package]
-name = "ruff"
-version = "0.0.160"
+[workspace.package]
 edition = "2021"
-rust-version = "1.65.0"
+rust-version = "1.71"
+homepage = "https://docs.astral.sh/ruff"
+documentation = "https://docs.astral.sh/ruff"
+repository = "https://github.com/astral-sh/ruff"
+authors = ["Charlie Marsh <charlie.r.marsh@gmail.com>"]
+license = "MIT"
 
-[lib]
-name = "ruff"
-
-[dependencies]
-annotate-snippets = { version = "0.9.1", features = ["color"] }
-anyhow = { version = "1.0.66" }
-atty = { version = "0.2.14" }
-bincode = { version = "1.3.3" }
-bitflags = { version = "1.3.2" }
-cachedir = { version = "0.3.0" }
-chrono = { version = "0.4.21", default-features = false, features = ["clock"] }
-clap = { version = "4.0.1", features = ["derive"] }
-clap_complete_command = "0.4.0"
+[workspace.dependencies]
+anyhow = { version = "1.0.69" }
+bitflags = { version = "2.4.1" }
+chrono = { version = "0.4.31", default-features = false, features = ["clock"] }
+clap = { version = "4.4.7", features = ["derive"] }
 colored = { version = "2.0.0" }
-common-path = { version = "1.0.0" }
-dirs = { version = "4.0.0" }
-fern = { version = "0.6.1" }
-filetime = { version = "0.2.17" }
-globset = { version = "0.4.9" }
-itertools = { version = "0.10.5" }
-libcst = { git = "https://github.com/charliermarsh/LibCST", rev = "f2f0b7a487a8725d161fe8b3ed73a6758b21e177" }
+filetime = { version = "0.2.20" }
+glob = { version = "0.3.1" }
+globset = { version = "0.4.10" }
+ignore = { version = "0.4.20" }
+insta = { version = "1.34.0", feature = ["filters", "glob"] }
+is-macro = { version = "0.3.0" }
+itertools = { version = "0.11.0" }
+libcst = { version = "1.1.0", default-features = false }
 log = { version = "0.4.17" }
-nohash-hasher = { version = "0.2.0" }
-notify = { version = "5.0.0" }
-num-bigint = { version = "0.4.3" }
-once_cell = { version = "1.16.0" }
-path-absolutize = { version = "3.0.14", features = ["once_cell_cache", "use_unix_paths_on_wasm"] }
-quick-junit = { version = "0.3.2" }
-rayon = { version = "1.5.3" }
-regex = { version = "1.6.0" }
-ropey = { version = "1.5.0", features = ["cr_lines", "simd"], default-features = false }
+memchr = { version = "2.6.4" }
+once_cell = { version = "1.17.1" }
+path-absolutize = { version = "3.1.1" }
+proc-macro2 = { version = "1.0.69" }
+quote = { version = "1.0.23" }
+regex = { version = "1.10.2" }
 rustc-hash = { version = "1.1.0" }
-rustpython-ast = { features = ["unparse"], git = "https://github.com/RustPython/RustPython.git", rev = "28f9f65ccc625f00835d84bbb5fba274dce5aa89" }
-rustpython-common = { git = "https://github.com/RustPython/RustPython.git", rev = "28f9f65ccc625f00835d84bbb5fba274dce5aa89" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/RustPython/RustPython.git", rev = "28f9f65ccc625f00835d84bbb5fba274dce5aa89" }
-serde = { version = "1.0.147", features = ["derive"] }
-serde_json = { version = "1.0.87" }
-strum = { version = "0.24.1", features = ["strum_macros"] }
-strum_macros = { version = "0.24.3" }
-textwrap = { version = "0.16.0" }
-titlecase = { version = "2.2.1" }
-toml = { version = "0.5.9" }
-update-informer = { version = "0.5.0", default-features = false, features = ["pypi"], optional = true }
-walkdir = { version = "2.3.2" }
-
-[target.'cfg(not(target_family = "wasm"))'.dependencies]
-clearscreen = { version = "1.0.10" } # uses which
-
-# https://docs.rs/getrandom/0.2.7/getrandom/#webassembly-support
-# For (future) wasm-pack support
-[target.'cfg(all(target_family = "wasm", target_os = "unknown"))'.dependencies]
-getrandom = { version = "0.2.7", features = ["js"] }
-
-[dev-dependencies]
-assert_cmd = { version = "2.0.4" }
-criterion = { version = "0.4.0" }
-insta = { version = "1.19.1", features = ["yaml"] }
-test-case = { version = "2.2.2" }
-
-[features]
-default = ["update-informer"]
-update-informer = ["dep:update-informer"]
+schemars = { version = "0.8.15" }
+serde = { version = "1.0.190", features = ["derive"] }
+serde_json = { version = "1.0.108" }
+shellexpand = { version = "3.0.0" }
+similar = { version = "2.3.0", features = ["inline"] }
+smallvec = { version = "1.11.1" }
+static_assertions = "1.1.0"
+strum = { version = "0.25.0", features = ["strum_macros"] }
+strum_macros = { version = "0.25.3" }
+syn = { version = "2.0.39" }
+test-case = { version = "3.2.1" }
+thiserror = { version = "1.0.50" }
+toml = { version = "0.7.8" }
+tracing = { version = "0.1.40" }
+tracing-indicatif = { version = "0.3.4" }
+tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
+unicode-ident = { version = "1.0.12" }
+unicode_names2 = { version = "1.2.0" }
+unicode-width = { version = "0.1.11" }
+uuid = { version = "1.5.0", features = ["v4", "fast-rng", "macro-diagnostics", "js"] }
+wsl = { version = "0.1.0" }
 
 [profile.release]
-panic = "abort"
-lto = "thin"
+lto = "fat"
 codegen-units = 1
-opt-level = 3
 
 [profile.dev.package.insta]
 opt-level = 3
@@ -85,6 +65,13 @@ opt-level = 3
 [profile.dev.package.similar]
 opt-level = 3
 
-[[bench]]
-name = "source_code_locator"
-harness = false
+# Reduce complexity of a parser function that would trigger a locals limit in a wasm tool.
+# https://github.com/bytecodealliance/wasm-tools/blob/b5c3d98e40590512a3b12470ef358d5c7b983b15/crates/wasmparser/src/limits.rs#L29
+[profile.dev.package.ruff_python_parser]
+opt-level = 1
+
+# Use the `--profile release-debug` flag to show symbols in release mode.
+# e.g. `cargo build --profile release-debug`
+[profile.release-debug]
+inherits = "release"
+debug = 1

_typos.toml

@@ -0,0 +1,11 @@
+[files]
+# https://github.com/crate-ci/typos/issues/868
+extend-exclude = ["**/resources/**/*", "**/snapshots/**/*"]
+
+[default.extend-words]
+hel = "hel"
+whos = "whos"
+spawnve = "spawnve"
+ned = "ned"
+poit = "poit"
+BA = "BA" # acronym for "Bad Allowed", used in testing.

assets/badge/format.json

@@ -0,0 +1,8 @@
+{
+  "label": "code style",
+  "message": "Ruff",
+  "logoSvg": "<svg width=\"510\" height=\"622\" viewBox=\"0 0 510 622\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M206.701 0C200.964 0 196.314 4.64131 196.314 10.3667V41.4667C196.314 47.192 191.663 51.8333 185.927 51.8333H156.843C151.107 51.8333 146.456 56.4746 146.456 62.2V145.133C146.456 150.859 141.806 155.5 136.069 155.5H106.986C101.249 155.5 96.5988 160.141 96.5988 165.867V222.883C96.5988 228.609 91.9484 233.25 86.2118 233.25H57.1283C51.3917 233.25 46.7413 237.891 46.7413 243.617V300.633C46.7413 306.359 42.0909 311 36.3544 311H10.387C4.6504 311 0 315.641 0 321.367V352.467C0 358.192 4.6504 362.833 10.387 362.833H145.418C151.154 362.833 155.804 367.475 155.804 373.2V430.217C155.804 435.942 151.154 440.583 145.418 440.583H116.334C110.597 440.583 105.947 445.225 105.947 450.95V507.967C105.947 513.692 101.297 518.333 95.5601 518.333H66.4766C60.74 518.333 56.0896 522.975 56.0896 528.7V611.633C56.0896 617.359 60.74 622 66.4766 622H149.572C155.309 622 159.959 617.359 159.959 611.633V570.167H201.507C207.244 570.167 211.894 565.525 211.894 559.8V528.7C211.894 522.975 216.544 518.333 222.281 518.333H251.365C257.101 518.333 261.752 513.692 261.752 507.967V476.867C261.752 471.141 266.402 466.5 272.138 466.5H301.222C306.959 466.5 311.609 461.859 311.609 456.133V425.033C311.609 419.308 316.259 414.667 321.996 414.667H351.079C356.816 414.667 361.466 410.025 361.466 404.3V373.2C361.466 367.475 366.117 362.833 371.853 362.833H400.937C406.673 362.833 411.324 358.192 411.324 352.467V321.367C411.324 315.641 415.974 311 421.711 311H450.794C456.531 311 461.181 306.359 461.181 300.633V217.7C461.181 211.975 456.531 207.333 450.794 207.333H420.672C414.936 207.333 410.285 202.692 410.285 196.967V165.867C410.285 160.141 414.936 155.5 420.672 155.5H449.756C455.492 155.5 460.143 150.859 460.143 145.133V114.033C460.143 108.308 464.793 103.667 470.53 103.667H499.613C505.35 103.667 510 99.0253 510 93.3V10.3667C510 4.64132 505.35 0 499.613 0H206.701ZM168.269 440.583C162.532 440.583 157.882 445.225 157.882 450.95V507.967C157.882 513.692 153.231 518.333 147.495 518.333H118.411C112.675 518.333 108.024 522.975 108.024 528.7V559.8C108.024 565.525 112.675 570.167 118.411 570.167H159.959V528.7C159.959 522.975 164.61 518.333 170.346 518.333H199.43C205.166 518.333 209.817 513.692 209.817 507.967V476.867C209.817 471.141 214.467 466.5 220.204 466.5H249.287C255.024 466.5 259.674 461.859 259.674 456.133V425.033C259.674 419.308 264.325 414.667 270.061 414.667H299.145C304.881 414.667 309.532 410.025 309.532 404.3V373.2C309.532 367.475 314.182 362.833 319.919 362.833H349.002C354.739 362.833 359.389 358.192 359.389 352.467V321.367C359.389 315.641 364.039 311 369.776 311H398.859C404.596 311 409.246 306.359 409.246 300.633V269.533C409.246 263.808 404.596 259.167 398.859 259.167H318.88C313.143 259.167 308.493 254.525 308.493 248.8V217.7C308.493 211.975 313.143 207.333 318.88 207.333H347.963C353.7 207.333 358.35 202.692 358.35 196.967V165.867C358.35 160.141 363.001 155.5 368.737 155.5H397.821C403.557 155.5 408.208 150.859 408.208 145.133V114.033C408.208 108.308 412.858 103.667 418.595 103.667H447.678C453.415 103.667 458.065 99.0253 458.065 93.3V62.2C458.065 56.4746 453.415 51.8333 447.678 51.8333H208.778C203.041 51.8333 198.391 56.4746 198.391 62.2V145.133C198.391 150.859 193.741 155.5 188.004 155.5H158.921C153.184 155.5 148.534 160.141 148.534 165.867V222.883C148.534 228.609 143.883 233.25 138.147 233.25H109.063C103.327 233.25 98.6762 237.891 98.6762 243.617V300.633C98.6762 306.359 103.327 311 109.063 311H197.352C203.089 311 207.739 315.641 207.739 321.367V430.217C207.739 435.942 203.089 440.583 197.352 440.583H168.269Z\" fill=\"#D7FF64\"/></svg>",
+  "logoWidth": 10,
+  "labelColor": "grey",
+  "color": "#261230"
+}

assets/badge/v0.json

@@ -0,0 +1,8 @@
+{
+  "label": "",
+  "message": "Ruff",
+  "logoSvg": "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"128\" height=\"128\"><path d=\"M115.36 61.84 70.22 50.49 114.45 2.4a1.222 1.222 0 0 0-1.54-1.87L12.3 61.98c-.41.25-.64.72-.57 1.2.06.48.4.87.87 1.01l45.07 13.25-44.29 48.16c-.42.46-.44 1.15-.04 1.61.24.29.58.44.94.44.22 0 .45-.06.65-.19l100.78-63.41c.42-.26.64-.75.56-1.22-.08-.49-.43-.88-.91-.99z\" style=\"fill:#fcc21b\"/></svg>",
+  "logoWidth": 10,
+  "labelColor": "grey",
+  "color": "#E15759"
+}

assets/badge/v1.json

@@ -0,0 +1,8 @@
+{
+  "label": "",
+  "message": "Ruff",
+  "logoSvg": "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"109\" height=\"132\" fill=\"none\"><g filter=\"url(#a)\"><path fill=\"#FCC21B\" d=\"m103.642 61.492-45.14-11.35 44.23-48.09a1.222 1.222 0 0 0-1.54-1.87L.582 61.632c-.41.25-.64.72-.57 1.2.06.48.4.87.87 1.01l45.07 13.25-44.29 48.16c-.42.46-.44 1.15-.04 1.61.24.29.58.44.94.44.22 0 .45-.06.65-.19l100.78-63.41c.42-.26.64-.75.56-1.22-.08-.49-.43-.88-.91-.99Z\"/></g><defs><filter id=\"a\" width=\"108.569\" height=\"131.302\" x=\"0\" y=\"0\" color-interpolation-filters=\"sRGB\" filterUnits=\"userSpaceOnUse\"><feFlood flood-opacity=\"0\" result=\"BackgroundImageFix\"/><feColorMatrix in=\"SourceAlpha\" result=\"hardAlpha\" values=\"0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 127 0\"/><feOffset dx=\"4\" dy=\"4\"/><feComposite in2=\"hardAlpha\" operator=\"out\"/><feColorMatrix values=\"0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0\"/><feBlend in2=\"BackgroundImageFix\" result=\"effect1_dropShadow_7_4\"/><feBlend in=\"SourceGraphic\" in2=\"effect1_dropShadow_7_4\" result=\"shape\"/></filter></defs></svg>",
+  "logoWidth": 10,
+  "labelColor": "grey",
+  "color": "#E15759"
+}

assets/badge/v2.json

@@ -0,0 +1,8 @@
+{
+  "label": "",
+  "message": "Ruff",
+  "logoSvg": "<svg width=\"510\" height=\"622\" viewBox=\"0 0 510 622\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M206.701 0C200.964 0 196.314 4.64131 196.314 10.3667V41.4667C196.314 47.192 191.663 51.8333 185.927 51.8333H156.843C151.107 51.8333 146.456 56.4746 146.456 62.2V145.133C146.456 150.859 141.806 155.5 136.069 155.5H106.986C101.249 155.5 96.5988 160.141 96.5988 165.867V222.883C96.5988 228.609 91.9484 233.25 86.2118 233.25H57.1283C51.3917 233.25 46.7413 237.891 46.7413 243.617V300.633C46.7413 306.359 42.0909 311 36.3544 311H10.387C4.6504 311 0 315.641 0 321.367V352.467C0 358.192 4.6504 362.833 10.387 362.833H145.418C151.154 362.833 155.804 367.475 155.804 373.2V430.217C155.804 435.942 151.154 440.583 145.418 440.583H116.334C110.597 440.583 105.947 445.225 105.947 450.95V507.967C105.947 513.692 101.297 518.333 95.5601 518.333H66.4766C60.74 518.333 56.0896 522.975 56.0896 528.7V611.633C56.0896 617.359 60.74 622 66.4766 622H149.572C155.309 622 159.959 617.359 159.959 611.633V570.167H201.507C207.244 570.167 211.894 565.525 211.894 559.8V528.7C211.894 522.975 216.544 518.333 222.281 518.333H251.365C257.101 518.333 261.752 513.692 261.752 507.967V476.867C261.752 471.141 266.402 466.5 272.138 466.5H301.222C306.959 466.5 311.609 461.859 311.609 456.133V425.033C311.609 419.308 316.259 414.667 321.996 414.667H351.079C356.816 414.667 361.466 410.025 361.466 404.3V373.2C361.466 367.475 366.117 362.833 371.853 362.833H400.937C406.673 362.833 411.324 358.192 411.324 352.467V321.367C411.324 315.641 415.974 311 421.711 311H450.794C456.531 311 461.181 306.359 461.181 300.633V217.7C461.181 211.975 456.531 207.333 450.794 207.333H420.672C414.936 207.333 410.285 202.692 410.285 196.967V165.867C410.285 160.141 414.936 155.5 420.672 155.5H449.756C455.492 155.5 460.143 150.859 460.143 145.133V114.033C460.143 108.308 464.793 103.667 470.53 103.667H499.613C505.35 103.667 510 99.0253 510 93.3V10.3667C510 4.64132 505.35 0 499.613 0H206.701ZM168.269 440.583C162.532 440.583 157.882 445.225 157.882 450.95V507.967C157.882 513.692 153.231 518.333 147.495 518.333H118.411C112.675 518.333 108.024 522.975 108.024 528.7V559.8C108.024 565.525 112.675 570.167 118.411 570.167H159.959V528.7C159.959 522.975 164.61 518.333 170.346 518.333H199.43C205.166 518.333 209.817 513.692 209.817 507.967V476.867C209.817 471.141 214.467 466.5 220.204 466.5H249.287C255.024 466.5 259.674 461.859 259.674 456.133V425.033C259.674 419.308 264.325 414.667 270.061 414.667H299.145C304.881 414.667 309.532 410.025 309.532 404.3V373.2C309.532 367.475 314.182 362.833 319.919 362.833H349.002C354.739 362.833 359.389 358.192 359.389 352.467V321.367C359.389 315.641 364.039 311 369.776 311H398.859C404.596 311 409.246 306.359 409.246 300.633V269.533C409.246 263.808 404.596 259.167 398.859 259.167H318.88C313.143 259.167 308.493 254.525 308.493 248.8V217.7C308.493 211.975 313.143 207.333 318.88 207.333H347.963C353.7 207.333 358.35 202.692 358.35 196.967V165.867C358.35 160.141 363.001 155.5 368.737 155.5H397.821C403.557 155.5 408.208 150.859 408.208 145.133V114.033C408.208 108.308 412.858 103.667 418.595 103.667H447.678C453.415 103.667 458.065 99.0253 458.065 93.3V62.2C458.065 56.4746 453.415 51.8333 447.678 51.8333H208.778C203.041 51.8333 198.391 56.4746 198.391 62.2V145.133C198.391 150.859 193.741 155.5 188.004 155.5H158.921C153.184 155.5 148.534 160.141 148.534 165.867V222.883C148.534 228.609 143.883 233.25 138.147 233.25H109.063C103.327 233.25 98.6762 237.891 98.6762 243.617V300.633C98.6762 306.359 103.327 311 109.063 311H197.352C203.089 311 207.739 315.641 207.739 321.367V430.217C207.739 435.942 203.089 440.583 197.352 440.583H168.269Z\" fill=\"#D7FF64\"/></svg>",
+  "logoWidth": 10,
+  "labelColor": "grey",
+  "color": "#261230"
+}

assets/svg/Astral.svg

@@ -0,0 +1,24 @@
+<svg width="139" height="24" viewBox="0 0 139 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <rect width="138.764" height="24" rx="2.18182" fill="#261230"/>
+  <path
+    d="M8.72798 15.2726H9.91316V11.8697L9.6887 10.4062L9.8952 10.3343L12.1309 15.1649L14.3486 10.3343L14.5461 10.4062L14.3486 11.8607V15.2726H15.5248V8.72714H13.9535L12.2117 12.7137H12.0142L10.2723 8.72714H8.72798V15.2726Z"
+    fill="#D7FF64"/>
+  <path
+    d="M22.3432 15.2726H23.6631L21.3017 8.72714H19.7574L17.4589 15.2726H18.7069L19.1558 13.9797H21.9033L22.3432 15.2726ZM19.497 13.0279L19.901 11.8607L20.4308 10.0021H20.6463L21.176 11.8607L21.5711 13.0279H19.497Z"
+    fill="#D7FF64"/>
+  <path
+    d="M25.4209 15.2726H28.1234C30.1077 15.2726 30.9876 14.1413 30.9876 12.0044C30.9876 9.92131 30.1706 8.72714 28.1234 8.72714H25.4209V15.2726ZM26.624 14.2131V9.77765H28.0965C29.147 9.77765 29.7306 10.1907 29.7306 11.4477V12.5521C29.7306 13.6923 29.2817 14.2131 28.0965 14.2131H26.624Z"
+    fill="#D7FF64"/>
+  <path
+    d="M33.079 15.2726H37.6491V14.2131H34.2822V12.3815H37.2002V11.3938H34.2822V9.77765H37.6491V8.72714H33.079V15.2726Z"
+    fill="#D7FF64"/>
+  <path
+    d="M42.923 15.2726H46.2451C47.4572 15.2726 48.2025 14.5812 48.2025 13.5487C48.2025 12.7675 47.8343 12.175 47.0532 11.9954V11.7799C47.6637 11.5734 48.0319 11.0436 48.0319 10.3433C48.0319 9.38259 47.4572 8.72714 46.281 8.72714H42.923V15.2726ZM44.0992 11.4746V9.65195H45.9578C46.4875 9.65195 46.7928 9.92131 46.7928 10.3523V10.7653C46.7928 11.1873 46.4965 11.4746 45.9758 11.4746H44.0992ZM44.0992 14.3388V12.3904H46.0296C46.5863 12.3904 46.9365 12.6418 46.9365 13.1806V13.5666C46.9365 14.0425 46.5684 14.3388 45.9309 14.3388H44.0992Z"
+    fill="#D7FF64"/>
+  <path
+    d="M49.6959 8.72714L52.174 12.579V14.1952H50.1898V15.2726H53.3772V12.579L55.8553 8.72714H54.4456L53.5119 10.2535L52.8744 11.3759H52.6679L52.0483 10.2715L51.1056 8.72714H49.6959Z"
+    fill="#D7FF64"/>
+  <path fill-rule="evenodd" clip-rule="evenodd"
+    d="M74.1824 7.63626C74.1824 7.03377 74.6708 6.54535 75.2733 6.54535H84.0006C84.6031 6.54535 85.0915 7.03377 85.0915 7.63626V9.81808H80.0733V8.94535H79.2006V10.6908H84.0006C84.6031 10.6908 85.0915 11.1792 85.0915 11.7817V16.3635C85.0915 16.966 84.6031 17.4544 84.0006 17.4544H75.2733C74.6708 17.4544 74.1824 16.966 74.1824 16.3635V14.1817L79.2006 14.1817V15.0544H80.0733V13.309L75.2733 13.309C74.6708 13.309 74.1824 12.8206 74.1824 12.2181V7.63626ZM63.4912 6.54545C62.8887 6.54545 62.4003 7.03387 62.4003 7.63636V17.4545H67.4185V14.1818H68.2912V17.4545H73.3094V7.63636C73.3094 7.03387 72.821 6.54545 72.2185 6.54545H63.4912ZM69.164 10.6909V11.5636H66.5458V10.6909H69.164ZM110.619 6.54545C110.016 6.54545 109.528 7.03387 109.528 7.63636V17.4545H114.546V14.1818H115.419V17.4545H120.437V7.63636C120.437 7.03387 119.948 6.54545 119.346 6.54545H110.619ZM116.291 10.6909V11.5636H113.673V10.6909H116.291ZM91.8549 8.29091H96.8731V11.3455C96.8731 11.9479 96.3847 12.4364 95.7822 12.4364H91.8549V13.3091H96.8731V17.4545H87.9276C87.3251 17.4545 86.8367 16.9661 86.8367 16.3636V12.4364H85.964V8.29091H86.8367V6.54545H91.8549V8.29091ZM108.655 7.63636C108.655 7.03387 108.166 6.54545 107.564 6.54545H97.7458V17.4545H102.764V14.1818H103.637V17.4545H108.655V13.3091H106.473V12.4364H107.564C108.166 12.4364 108.655 11.9479 108.655 11.3455V7.63636ZM104.509 10.6909V11.5636H101.891V10.6909H104.509ZM132.218 13.3091L126.327 13.3091V6.54547L121.309 6.54547V17.4546H132.218V13.3091Z"
+    fill="#D7FF64"/>
+</svg>

benches/source_code_locator.rs

@@ -1,18 +0,0 @@
-use std::fs;
-use std::path::Path;
-
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
-use ropey::Rope;
-
-fn criterion_benchmark(c: &mut Criterion) {
-    let contents = fs::read_to_string(Path::new("resources/test/fixtures/D.py")).unwrap();
-    c.bench_function("rope", |b| {
-        b.iter(|| {
-            let rope = Rope::from_str(black_box(&contents));
-            rope.line_to_char(black_box(4));
-        });
-    });
-}
-
-criterion_group!(benches, criterion_benchmark);
-criterion_main!(benches);

clippy.toml

@@ -0,0 +1,7 @@
+doc-valid-idents = [
+  "StackOverflow",
+  "CodeQL",
+  "IPython",
+  "NumPy",
+  "..",
+]

crates/flake8_to_ruff/Cargo.toml

@@ -0,0 +1,36 @@
+[package]
+name = "flake8-to-ruff"
+version = "0.1.5"
+description = """
+Convert Flake8 configuration files to Ruff configuration files.
+"""
+authors = { workspace = true }
+edition = { workspace = true }
+rust-version = { workspace = true }
+homepage = { workspace = true }
+documentation = { workspace = true }
+repository = { workspace = true }
+license = { workspace = true }
+
+[dependencies]
+ruff_linter = { path = "../ruff_linter", default-features = false }
+ruff_workspace = { path = "../ruff_workspace" }
+
+anyhow = { workspace = true }
+clap = { workspace = true }
+colored = { workspace = true }
+configparser = { version = "3.0.2" }
+itertools = { workspace = true }
+log = { workspace = true }
+once_cell = { workspace = true }
+pep440_rs = { version = "0.3.12", features = ["serde"] }
+regex = { workspace = true }
+rustc-hash = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+strum = { workspace = true }
+strum_macros = { workspace = true }
+toml = { workspace = true }
+
+[dev-dependencies]
+pretty_assertions = "1.3.0"

crates/flake8_to_ruff/README.md

@@ -0,0 +1,99 @@
+# flake8-to-ruff
+
+Convert existing Flake8 configuration files (`setup.cfg`, `tox.ini`, or `.flake8`) for use with
+[Ruff](https://github.com/astral-sh/ruff).
+
+Generates a Ruff-compatible `pyproject.toml` section.
+
+## Installation and Usage
+
+### Installation
+
+Available as [`flake8-to-ruff`](https://pypi.org/project/flake8-to-ruff/) on PyPI:
+
+```shell
+pip install flake8-to-ruff
+```
+
+### Usage
+
+To run `flake8-to-ruff`:
+
+```shell
+flake8-to-ruff path/to/setup.cfg
+flake8-to-ruff path/to/tox.ini
+flake8-to-ruff path/to/.flake8
+```
+
+`flake8-to-ruff` will print the relevant `pyproject.toml` sections to standard output, like so:
+
+```toml
+[tool.ruff]
+exclude = [
+    '.svn',
+    'CVS',
+    '.bzr',
+    '.hg',
+    '.git',
+    '__pycache__',
+    '.tox',
+    '.idea',
+    '.mypy_cache',
+    '.venv',
+    'node_modules',
+    '_state_machine.py',
+    'test_fstring.py',
+    'bad_coding2.py',
+    'badsyntax_*.py',
+]
+select = [
+    'A',
+    'E',
+    'F',
+    'Q',
+]
+ignore = []
+
+[tool.ruff.flake8-quotes]
+inline-quotes = 'single'
+
+[tool.ruff.pep8-naming]
+ignore-names = [
+    'foo',
+    'bar',
+]
+```
+
+### Plugins
+
+`flake8-to-ruff` will attempt to infer any activated plugins based on the settings provided in your
+configuration file.
+
+For example, if your `.flake8` file includes a `docstring-convention` property, `flake8-to-ruff`
+will enable the appropriate [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
+checks.
+
+Alternatively, you can manually specify plugins on the command-line:
+
+```shell
+flake8-to-ruff path/to/.flake8 --plugin flake8-builtins --plugin flake8-quotes
+```
+
+## Limitations
+
+1. Ruff only supports a subset of the Flake configuration options. `flake8-to-ruff` will warn on and
+    ignore unsupported options in the `.flake8` file (or equivalent). (Similarly, Ruff has a few
+    configuration options that don't exist in Flake8.)
+1. Ruff will omit any rule codes that are unimplemented or unsupported by Ruff, including rule
+    codes from unsupported plugins. (See the
+    [documentation](https://docs.astral.sh/ruff/faq/#how-does-ruff-compare-to-flake8) for the complete
+    list of supported plugins.)
+
+## License
+
+MIT
+
+## Contributing
+
+Contributions are welcome and hugely appreciated. To get started, check out the
+[contributing guidelines](https://github.com/astral-sh/ruff/blob/main/CONTRIBUTING.md).

crates/flake8_to_ruff/examples/cryptography/pyproject.toml

@@ -0,0 +1,65 @@
+[build-system]
+requires = [
+    # The minimum setuptools version is specific to the PEP 517 backend,
+    # and may be stricter than the version required in `setup.cfg`
+    "setuptools>=40.6.0,!=60.9.0",
+    "wheel",
+    # Must be kept in sync with the `install_requirements` in `setup.cfg`
+    "cffi>=1.12; platform_python_implementation != 'PyPy'",
+    "setuptools-rust>=0.11.4",
+]
+build-backend = "setuptools.build_meta"
+
+[tool.black]
+line-length = 79
+target-version = ["py36"]
+
+[tool.pytest.ini_options]
+addopts = "-r s --capture=no --strict-markers --benchmark-disable"
+markers = [
+    "skip_fips: this test is not executed in FIPS mode",
+    "supported: parametrized test requiring only_if and skip_message",
+]
+
+[tool.mypy]
+show_error_codes = true
+check_untyped_defs = true
+no_implicit_reexport = true
+warn_redundant_casts = true
+warn_unused_ignores = true
+warn_unused_configs = true
+strict_equality = true
+
+[[tool.mypy.overrides]]
+module = [
+    "pretend"
+]
+ignore_missing_imports = true
+
+[tool.coverage.run]
+branch = true
+relative_files = true
+source = [
+    "cryptography",
+    "tests/",
+]
+
+[tool.coverage.paths]
+source = [
+   "src/cryptography",
+   "*.tox/*/lib*/python*/site-packages/cryptography",
+   "*.tox\\*\\Lib\\site-packages\\cryptography",
+   "*.tox/pypy/site-packages/cryptography",
+]
+tests =[
+   "tests/",
+   "*tests\\",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "@abc.abstractmethod",
+    "@abc.abstractproperty",
+    "@typing.overload",
+    "if typing.TYPE_CHECKING",
+]

crates/flake8_to_ruff/examples/cryptography/setup.cfg

@@ -0,0 +1,91 @@
+[metadata]
+name = cryptography
+version = attr: cryptography.__version__
+description = cryptography is a package which provides cryptographic recipes and primitives to Python developers.
+long_description = file: README.rst
+long_description_content_type = text/x-rst
+license = BSD-3-Clause OR Apache-2.0
+url = https://github.com/pyca/cryptography
+author = The Python Cryptographic Authority and individual contributors
+author_email = cryptography-dev@python.org
+project_urls =
+    Documentation=https://cryptography.io/
+    Source=https://github.com/pyca/cryptography/
+    Issues=https://github.com/pyca/cryptography/issues
+    Changelog=https://cryptography.io/en/latest/changelog/
+classifiers =
+    Development Status :: 5 - Production/Stable
+    Intended Audience :: Developers
+    License :: OSI Approved :: Apache Software License
+    License :: OSI Approved :: BSD License
+    Natural Language :: English
+    Operating System :: MacOS :: MacOS X
+    Operating System :: POSIX
+    Operating System :: POSIX :: BSD
+    Operating System :: POSIX :: Linux
+    Operating System :: Microsoft :: Windows
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
+    Programming Language :: Python :: Implementation :: CPython
+    Programming Language :: Python :: Implementation :: PyPy
+    Topic :: Security :: Cryptography
+
+[options]
+python_requires = >=3.6
+include_package_data = True
+zip_safe = False
+package_dir =
+    =src
+packages = find:
+# `install_requires` must be kept in sync with `pyproject.toml`
+install_requires =
+    cffi >=1.12
+
+[options.packages.find]
+where = src
+exclude =
+    _cffi_src
+    _cffi_src.*
+
+[options.extras_require]
+test =
+    pytest>=6.2.0
+    pytest-benchmark
+    pytest-cov
+    pytest-subtests
+    pytest-xdist
+    pretend
+    iso8601
+    pytz
+    hypothesis>=1.11.4,!=3.79.2
+docs =
+    sphinx >= 1.6.5,!=1.8.0,!=3.1.0,!=3.1.1,!=5.2.0,!=5.2.0.post0
+    sphinx_rtd_theme
+docstest =
+    pyenchant >= 1.6.11
+    twine >= 1.12.0
+    sphinxcontrib-spelling >= 4.0.1
+sdist =
+    setuptools_rust >= 0.11.4
+pep8test =
+    black
+    flake8
+    flake8-import-order
+    pep8-naming
+# This extra is for OpenSSH private keys that use bcrypt KDF
+# Versions: v3.1.3 - ignore_few_rounds, v3.1.5 - abi3
+ssh =
+    bcrypt >= 3.1.5
+
+[flake8]
+ignore = E203,E211,W503,W504,N818
+exclude = .tox,*.egg,.git,_build,.hypothesis
+select = E,W,F,N,I
+application-import-names = cryptography,cryptography_vectors,tests

crates/flake8_to_ruff/examples/jupyterhub.ini

@@ -0,0 +1,19 @@
+[flake8]
+# Ignore style and complexity
+# E: style errors
+# W: style warnings
+# C: complexity
+# D: docstring warnings (unused pydocstyle extension)
+# F841: local variable assigned but never used
+ignore = E, C, W, D, F841
+builtins = c, get_config
+exclude =
+    .cache,
+    .github,
+    docs,
+    jupyterhub/alembic*,
+    onbuild,
+    scripts,
+    share,
+    tools,
+    setup.py

crates/flake8_to_ruff/examples/manim.ini

@@ -0,0 +1,43 @@
+[flake8]
+# Exclude the grpc generated code
+exclude = ./manim/grpc/gen/*
+max-complexity = 15
+max-line-length = 88
+statistics = True
+# Prevents some flake8-rst-docstrings errors
+rst-roles = attr,class,func,meth,mod,obj,ref,doc,exc
+rst-directives = manim, SEEALSO, seealso
+docstring-convention=numpy
+
+select = A,A00,B,B9,C4,C90,D,E,F,F,PT,RST,SIM,W
+
+                # General Compatibility
+extend-ignore = E203, W503, D202, D212, D213, D404
+
+                # Misc
+                F401, F403, F405, F841, E501, E731, E402, F811, F821,
+
+                # Plug-in: flake8-builtins
+                A001, A002, A003,
+
+                # Plug-in: flake8-bugbear
+                B006, B007, B008, B009, B010, B903, B950,
+
+                # Plug-in: flake8-simplify
+                SIM105, SIM106, SIM119,
+
+                # Plug-in: flake8-comprehensions
+                C901
+
+                # Plug-in: flake8-pytest-style
+                PT001, PT004, PT006, PT011, PT018, PT022, PT023,
+
+                # Plug-in: flake8-docstrings
+                D100, D101, D102, D103, D104, D105, D106, D107,
+                D200, D202, D204, D205, D209,
+                D301,
+                D400, D401, D402, D403, D405, D406, D407, D409, D411, D412, D414,
+
+                # Plug-in: flake8-rst-docstrings
+                RST201, RST203, RST210, RST212, RST213, RST215,
+                RST301, RST303,

crates/flake8_to_ruff/pyproject.toml

@@ -0,0 +1,34 @@
+[project]
+name = "flake8-to-ruff"
+keywords = ["automation", "flake8", "pycodestyle", "pyflakes", "pylint", "clippy"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3 :: Only",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Software Development :: Quality Assurance",
+]
+author = "Charlie Marsh"
+author_email = "charlie.r.marsh@gmail.com"
+description = "Convert existing Flake8 configuration to Ruff."
+requires-python = ">=3.7"
+
+[project.urls]
+repository = "https://github.com/astral-sh/ruff#subdirectory=crates/flake8_to_ruff"
+
+[build-system]
+requires = ["maturin>=1.0,<2.0"]
+build-backend = "maturin"
+
+[tool.maturin]
+bindings = "bin"
+strip = true

crates/flake8_to_ruff/src/black.rs

@@ -0,0 +1,13 @@
+//! Extract Black configuration settings from a pyproject.toml.
+
+use ruff_linter::line_width::LineLength;
+use ruff_linter::settings::types::PythonVersion;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub(crate) struct Black {
+    #[serde(alias = "line-length", alias = "line_length")]
+    pub(crate) line_length: Option<LineLength>,
+    #[serde(alias = "target-version", alias = "target_version")]
+    pub(crate) target_version: Option<Vec<PythonVersion>>,
+}

crates/flake8_to_ruff/src/converter.rs

@@ -0,0 +1,687 @@
+use std::collections::{HashMap, HashSet};
+use std::str::FromStr;
+
+use itertools::Itertools;
+
+use ruff_linter::line_width::LineLength;
+use ruff_linter::registry::Linter;
+use ruff_linter::rule_selector::RuleSelector;
+use ruff_linter::rules::flake8_pytest_style::types::{
+    ParametrizeNameType, ParametrizeValuesRowType, ParametrizeValuesType,
+};
+use ruff_linter::rules::flake8_quotes::settings::Quote;
+use ruff_linter::rules::flake8_tidy_imports::settings::Strictness;
+use ruff_linter::rules::pydocstyle::settings::Convention;
+use ruff_linter::settings::types::PythonVersion;
+use ruff_linter::settings::DEFAULT_SELECTORS;
+use ruff_linter::warn_user;
+use ruff_workspace::options::{
+    Flake8AnnotationsOptions, Flake8BugbearOptions, Flake8BuiltinsOptions, Flake8ErrMsgOptions,
+    Flake8PytestStyleOptions, Flake8QuotesOptions, Flake8TidyImportsOptions, LintCommonOptions,
+    LintOptions, McCabeOptions, Options, Pep8NamingOptions, PydocstyleOptions,
+};
+use ruff_workspace::pyproject::Pyproject;
+
+use super::external_config::ExternalConfig;
+use super::plugin::Plugin;
+use super::{parser, plugin};
+
+pub(crate) fn convert(
+    config: &HashMap<String, HashMap<String, Option<String>>>,
+    external_config: &ExternalConfig,
+    plugins: Option<Vec<Plugin>>,
+) -> Pyproject {
+    // Extract the Flake8 section.
+    let flake8 = config
+        .get("flake8")
+        .expect("Unable to find flake8 section in INI file");
+
+    // Extract all referenced rule code prefixes, to power plugin inference.
+    let mut referenced_codes: HashSet<RuleSelector> = HashSet::default();
+    for (key, value) in flake8 {
+        if let Some(value) = value {
+            match key.as_str() {
+                "select" | "ignore" | "extend-select" | "extend_select" | "extend-ignore"
+                | "extend_ignore" => {
+                    referenced_codes.extend(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "per-file-ignores" | "per_file_ignores" => {
+                    if let Ok(per_file_ignores) =
+                        parser::parse_files_to_codes_mapping(value.as_ref())
+                    {
+                        for (_, codes) in parser::collect_per_file_ignores(per_file_ignores) {
+                            referenced_codes.extend(codes);
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+    }
+
+    // Infer plugins, if not provided.
+    let plugins = plugins.unwrap_or_else(|| {
+        let from_options = plugin::infer_plugins_from_options(flake8);
+        if !from_options.is_empty() {
+            #[allow(clippy::print_stderr)]
+            {
+                eprintln!("Inferred plugins from settings: {from_options:#?}");
+            }
+        }
+        let from_codes = plugin::infer_plugins_from_codes(&referenced_codes);
+        if !from_codes.is_empty() {
+            #[allow(clippy::print_stderr)]
+            {
+                eprintln!("Inferred plugins from referenced codes: {from_codes:#?}");
+            }
+        }
+        from_options.into_iter().chain(from_codes).collect()
+    });
+
+    // Check if the user has specified a `select`. If not, we'll add our own
+    // default `select`, and populate it based on user plugins.
+    let mut select = flake8
+        .get("select")
+        .and_then(|value| {
+            value
+                .as_ref()
+                .map(|value| HashSet::from_iter(parser::parse_prefix_codes(value)))
+        })
+        .unwrap_or_else(|| resolve_select(&plugins));
+    let mut ignore: HashSet<RuleSelector> = flake8
+        .get("ignore")
+        .and_then(|value| {
+            value
+                .as_ref()
+                .map(|value| HashSet::from_iter(parser::parse_prefix_codes(value)))
+        })
+        .unwrap_or_default();
+
+    // Parse each supported option.
+    let mut options = Options::default();
+    let mut lint_options = LintCommonOptions::default();
+    let mut flake8_annotations = Flake8AnnotationsOptions::default();
+    let mut flake8_bugbear = Flake8BugbearOptions::default();
+    let mut flake8_builtins = Flake8BuiltinsOptions::default();
+    let mut flake8_errmsg = Flake8ErrMsgOptions::default();
+    let mut flake8_pytest_style = Flake8PytestStyleOptions::default();
+    let mut flake8_quotes = Flake8QuotesOptions::default();
+    let mut flake8_tidy_imports = Flake8TidyImportsOptions::default();
+    let mut mccabe = McCabeOptions::default();
+    let mut pep8_naming = Pep8NamingOptions::default();
+    let mut pydocstyle = PydocstyleOptions::default();
+    for (key, value) in flake8 {
+        if let Some(value) = value {
+            match key.as_str() {
+                // flake8
+                "builtins" => {
+                    options.builtins = Some(parser::parse_strings(value.as_ref()));
+                }
+                "max-line-length" | "max_line_length" => match LineLength::from_str(value) {
+                    Ok(line_length) => options.line_length = Some(line_length),
+                    Err(e) => {
+                        warn_user!("Unable to parse '{key}' property: {e}");
+                    }
+                },
+                "select" => {
+                    // No-op (handled above).
+                    select.extend(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "ignore" => {
+                    // No-op (handled above).
+                }
+                "extend-select" | "extend_select" => {
+                    // Unlike Flake8, use a single explicit `select`.
+                    select.extend(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "extend-ignore" | "extend_ignore" => {
+                    // Unlike Flake8, use a single explicit `ignore`.
+                    ignore.extend(parser::parse_prefix_codes(value.as_ref()));
+                }
+                "exclude" => {
+                    options.exclude = Some(parser::parse_strings(value.as_ref()));
+                }
+                "extend-exclude" | "extend_exclude" => {
+                    options.extend_exclude = Some(parser::parse_strings(value.as_ref()));
+                }
+                "per-file-ignores" | "per_file_ignores" => {
+                    match parser::parse_files_to_codes_mapping(value.as_ref()) {
+                        Ok(per_file_ignores) => {
+                            lint_options.per_file_ignores =
+                                Some(parser::collect_per_file_ignores(per_file_ignores));
+                        }
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                // flake8-bugbear
+                "extend-immutable-calls" | "extend_immutable_calls" => {
+                    flake8_bugbear.extend_immutable_calls =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                // flake8-builtins
+                "builtins-ignorelist" | "builtins_ignorelist" => {
+                    flake8_builtins.builtins_ignorelist =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                // flake8-annotations
+                "suppress-none-returning" | "suppress_none_returning" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.suppress_none_returning = Some(bool),
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                "suppress-dummy-args" | "suppress_dummy_args" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.suppress_dummy_args = Some(bool),
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                "mypy-init-return" | "mypy_init_return" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.mypy_init_return = Some(bool),
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                "allow-star-arg-any" | "allow_star_arg_any" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_annotations.allow_star_arg_any = Some(bool),
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                // flake8-quotes
+                "quotes" | "inline-quotes" | "inline_quotes" => match value.trim() {
+                    "'" | "single" => flake8_quotes.inline_quotes = Some(Quote::Single),
+                    "\"" | "double" => flake8_quotes.inline_quotes = Some(Quote::Double),
+                    _ => {
+                        warn_user!("Unexpected '{key}' value: {value}");
+                    }
+                },
+                "multiline-quotes" | "multiline_quotes" => match value.trim() {
+                    "'" | "single" => flake8_quotes.multiline_quotes = Some(Quote::Single),
+                    "\"" | "double" => flake8_quotes.multiline_quotes = Some(Quote::Double),
+                    _ => {
+                        warn_user!("Unexpected '{key}' value: {value}");
+                    }
+                },
+                "docstring-quotes" | "docstring_quotes" => match value.trim() {
+                    "'" | "single" => flake8_quotes.docstring_quotes = Some(Quote::Single),
+                    "\"" | "double" => flake8_quotes.docstring_quotes = Some(Quote::Double),
+                    _ => {
+                        warn_user!("Unexpected '{key}' value: {value}");
+                    }
+                },
+                "avoid-escape" | "avoid_escape" => match parser::parse_bool(value.as_ref()) {
+                    Ok(bool) => flake8_quotes.avoid_escape = Some(bool),
+                    Err(e) => {
+                        warn_user!("Unable to parse '{key}' property: {e}");
+                    }
+                },
+                // pep8-naming
+                "ignore-names" | "ignore_names" => {
+                    pep8_naming.ignore_names = Some(parser::parse_strings(value.as_ref()));
+                }
+                "classmethod-decorators" | "classmethod_decorators" => {
+                    pep8_naming.classmethod_decorators =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                "staticmethod-decorators" | "staticmethod_decorators" => {
+                    pep8_naming.staticmethod_decorators =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                // flake8-tidy-imports
+                "ban-relative-imports" | "ban_relative_imports" => match value.trim() {
+                    "true" => flake8_tidy_imports.ban_relative_imports = Some(Strictness::All),
+                    "parents" => {
+                        flake8_tidy_imports.ban_relative_imports = Some(Strictness::Parents);
+                    }
+                    _ => {
+                        warn_user!("Unexpected '{key}' value: {value}");
+                    }
+                },
+                // flake8-docstrings
+                "docstring-convention" => match value.trim() {
+                    "google" => pydocstyle.convention = Some(Convention::Google),
+                    "numpy" => pydocstyle.convention = Some(Convention::Numpy),
+                    "pep257" => pydocstyle.convention = Some(Convention::Pep257),
+                    "all" => pydocstyle.convention = None,
+                    _ => {
+                        warn_user!("Unexpected '{key}' value: {value}");
+                    }
+                },
+                // mccabe
+                "max-complexity" | "max_complexity" => match value.parse::<usize>() {
+                    Ok(max_complexity) => mccabe.max_complexity = Some(max_complexity),
+                    Err(e) => {
+                        warn_user!("Unable to parse '{key}' property: {e}");
+                    }
+                },
+                // flake8-errmsg
+                "errmsg-max-string-length" | "errmsg_max_string_length" => {
+                    match value.parse::<usize>() {
+                        Ok(max_string_length) => {
+                            flake8_errmsg.max_string_length = Some(max_string_length);
+                        }
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                // flake8-pytest-style
+                "pytest-fixture-no-parentheses" | "pytest_fixture_no_parentheses " => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_pytest_style.fixture_parentheses = Some(!bool),
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                "pytest-parametrize-names-type" | "pytest_parametrize_names_type" => {
+                    match value.trim() {
+                        "csv" => {
+                            flake8_pytest_style.parametrize_names_type =
+                                Some(ParametrizeNameType::Csv);
+                        }
+                        "tuple" => {
+                            flake8_pytest_style.parametrize_names_type =
+                                Some(ParametrizeNameType::Tuple);
+                        }
+                        "list" => {
+                            flake8_pytest_style.parametrize_names_type =
+                                Some(ParametrizeNameType::List);
+                        }
+                        _ => {
+                            warn_user!("Unexpected '{key}' value: {value}");
+                        }
+                    }
+                }
+                "pytest-parametrize-values-type" | "pytest_parametrize_values_type" => {
+                    match value.trim() {
+                        "tuple" => {
+                            flake8_pytest_style.parametrize_values_type =
+                                Some(ParametrizeValuesType::Tuple);
+                        }
+                        "list" => {
+                            flake8_pytest_style.parametrize_values_type =
+                                Some(ParametrizeValuesType::List);
+                        }
+                        _ => {
+                            warn_user!("Unexpected '{key}' value: {value}");
+                        }
+                    }
+                }
+                "pytest-parametrize-values-row-type" | "pytest_parametrize_values_row_type" => {
+                    match value.trim() {
+                        "tuple" => {
+                            flake8_pytest_style.parametrize_values_row_type =
+                                Some(ParametrizeValuesRowType::Tuple);
+                        }
+                        "list" => {
+                            flake8_pytest_style.parametrize_values_row_type =
+                                Some(ParametrizeValuesRowType::List);
+                        }
+                        _ => {
+                            warn_user!("Unexpected '{key}' value: {value}");
+                        }
+                    }
+                }
+                "pytest-raises-require-match-for" | "pytest_raises_require_match_for" => {
+                    flake8_pytest_style.raises_require_match_for =
+                        Some(parser::parse_strings(value.as_ref()));
+                }
+                "pytest-mark-no-parentheses" | "pytest_mark_no_parentheses" => {
+                    match parser::parse_bool(value.as_ref()) {
+                        Ok(bool) => flake8_pytest_style.mark_parentheses = Some(!bool),
+                        Err(e) => {
+                            warn_user!("Unable to parse '{key}' property: {e}");
+                        }
+                    }
+                }
+                // Unknown
+                _ => {
+                    warn_user!("Skipping unsupported property: {}", key);
+                }
+            }
+        }
+    }
+
+    // Deduplicate and sort.
+    lint_options.select = Some(
+        select
+            .into_iter()
+            .sorted_by_key(RuleSelector::prefix_and_code)
+            .collect(),
+    );
+    lint_options.ignore = Some(
+        ignore
+            .into_iter()
+            .sorted_by_key(RuleSelector::prefix_and_code)
+            .collect(),
+    );
+    if flake8_annotations != Flake8AnnotationsOptions::default() {
+        lint_options.flake8_annotations = Some(flake8_annotations);
+    }
+    if flake8_bugbear != Flake8BugbearOptions::default() {
+        lint_options.flake8_bugbear = Some(flake8_bugbear);
+    }
+    if flake8_builtins != Flake8BuiltinsOptions::default() {
+        lint_options.flake8_builtins = Some(flake8_builtins);
+    }
+    if flake8_errmsg != Flake8ErrMsgOptions::default() {
+        lint_options.flake8_errmsg = Some(flake8_errmsg);
+    }
+    if flake8_pytest_style != Flake8PytestStyleOptions::default() {
+        lint_options.flake8_pytest_style = Some(flake8_pytest_style);
+    }
+    if flake8_quotes != Flake8QuotesOptions::default() {
+        lint_options.flake8_quotes = Some(flake8_quotes);
+    }
+    if flake8_tidy_imports != Flake8TidyImportsOptions::default() {
+        lint_options.flake8_tidy_imports = Some(flake8_tidy_imports);
+    }
+    if mccabe != McCabeOptions::default() {
+        lint_options.mccabe = Some(mccabe);
+    }
+    if pep8_naming != Pep8NamingOptions::default() {
+        lint_options.pep8_naming = Some(pep8_naming);
+    }
+    if pydocstyle != PydocstyleOptions::default() {
+        lint_options.pydocstyle = Some(pydocstyle);
+    }
+
+    // Extract any settings from the existing `pyproject.toml`.
+    if let Some(black) = &external_config.black {
+        if let Some(line_length) = &black.line_length {
+            options.line_length = Some(*line_length);
+        }
+
+        if let Some(target_version) = &black.target_version {
+            if let Some(target_version) = target_version.iter().min() {
+                options.target_version = Some(*target_version);
+            }
+        }
+    }
+
+    if let Some(isort) = &external_config.isort {
+        if let Some(src_paths) = &isort.src_paths {
+            match options.src.as_mut() {
+                Some(src) => {
+                    src.extend_from_slice(src_paths);
+                }
+                None => {
+                    options.src = Some(src_paths.clone());
+                }
+            }
+        }
+    }
+
+    if let Some(project) = &external_config.project {
+        if let Some(requires_python) = &project.requires_python {
+            if options.target_version.is_none() {
+                options.target_version =
+                    PythonVersion::get_minimum_supported_version(requires_python);
+            }
+        }
+    }
+
+    if lint_options != LintCommonOptions::default() {
+        options.lint = Some(LintOptions {
+            common: lint_options,
+            ..LintOptions::default()
+        });
+    }
+
+    // Create the pyproject.toml.
+    Pyproject::new(options)
+}
+
+/// Resolve the set of enabled `RuleSelector` values for the given
+/// plugins.
+fn resolve_select(plugins: &[Plugin]) -> HashSet<RuleSelector> {
+    let mut select: HashSet<_> = DEFAULT_SELECTORS.iter().cloned().collect();
+    select.extend(plugins.iter().map(|p| Linter::from(p).into()));
+    select
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+    use std::str::FromStr;
+
+    use anyhow::Result;
+    use itertools::Itertools;
+    use pep440_rs::VersionSpecifiers;
+
+    use pretty_assertions::assert_eq;
+    use ruff_linter::line_width::LineLength;
+    use ruff_linter::registry::Linter;
+    use ruff_linter::rule_selector::RuleSelector;
+    use ruff_linter::rules::flake8_quotes;
+    use ruff_linter::rules::pydocstyle::settings::Convention;
+    use ruff_linter::settings::types::PythonVersion;
+    use ruff_workspace::options::{
+        Flake8QuotesOptions, LintCommonOptions, LintOptions, Options, PydocstyleOptions,
+    };
+    use ruff_workspace::pyproject::Pyproject;
+
+    use crate::converter::DEFAULT_SELECTORS;
+    use crate::pep621::Project;
+    use crate::ExternalConfig;
+
+    use super::super::plugin::Plugin;
+    use super::convert;
+
+    fn lint_default_options(plugins: impl IntoIterator<Item = RuleSelector>) -> LintCommonOptions {
+        LintCommonOptions {
+            ignore: Some(vec![]),
+            select: Some(
+                DEFAULT_SELECTORS
+                    .iter()
+                    .cloned()
+                    .chain(plugins)
+                    .sorted_by_key(RuleSelector::prefix_and_code)
+                    .collect(),
+            ),
+            ..LintCommonOptions::default()
+        }
+    }
+
+    #[test]
+    fn it_converts_empty() {
+        let actual = convert(
+            &HashMap::from([("flake8".to_string(), HashMap::default())]),
+            &ExternalConfig::default(),
+            None,
+        );
+        let expected = Pyproject::new(Options {
+            lint: Some(LintOptions {
+                common: lint_default_options([]),
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_converts_dashes() {
+        let actual = convert(
+            &HashMap::from([(
+                "flake8".to_string(),
+                HashMap::from([("max-line-length".to_string(), Some("100".to_string()))]),
+            )]),
+            &ExternalConfig::default(),
+            Some(vec![]),
+        );
+        let expected = Pyproject::new(Options {
+            line_length: Some(LineLength::try_from(100).unwrap()),
+            lint: Some(LintOptions {
+                common: lint_default_options([]),
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_converts_underscores() {
+        let actual = convert(
+            &HashMap::from([(
+                "flake8".to_string(),
+                HashMap::from([("max_line_length".to_string(), Some("100".to_string()))]),
+            )]),
+            &ExternalConfig::default(),
+            Some(vec![]),
+        );
+        let expected = Pyproject::new(Options {
+            line_length: Some(LineLength::try_from(100).unwrap()),
+            lint: Some(LintOptions {
+                common: lint_default_options([]),
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_ignores_parse_errors() {
+        let actual = convert(
+            &HashMap::from([(
+                "flake8".to_string(),
+                HashMap::from([("max_line_length".to_string(), Some("abc".to_string()))]),
+            )]),
+            &ExternalConfig::default(),
+            Some(vec![]),
+        );
+        let expected = Pyproject::new(Options {
+            lint: Some(LintOptions {
+                common: lint_default_options([]),
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_converts_plugin_options() {
+        let actual = convert(
+            &HashMap::from([(
+                "flake8".to_string(),
+                HashMap::from([("inline-quotes".to_string(), Some("single".to_string()))]),
+            )]),
+            &ExternalConfig::default(),
+            Some(vec![]),
+        );
+        let expected = Pyproject::new(Options {
+            lint: Some(LintOptions {
+                common: LintCommonOptions {
+                    flake8_quotes: Some(Flake8QuotesOptions {
+                        inline_quotes: Some(flake8_quotes::settings::Quote::Single),
+                        multiline_quotes: None,
+                        docstring_quotes: None,
+                        avoid_escape: None,
+                    }),
+                    ..lint_default_options([])
+                },
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_converts_docstring_conventions() {
+        let actual = convert(
+            &HashMap::from([(
+                "flake8".to_string(),
+                HashMap::from([(
+                    "docstring-convention".to_string(),
+                    Some("numpy".to_string()),
+                )]),
+            )]),
+            &ExternalConfig::default(),
+            Some(vec![Plugin::Flake8Docstrings]),
+        );
+        let expected = Pyproject::new(Options {
+            lint: Some(LintOptions {
+                common: LintCommonOptions {
+                    pydocstyle: Some(PydocstyleOptions {
+                        convention: Some(Convention::Numpy),
+                        ignore_decorators: None,
+                        property_decorators: None,
+                    }),
+                    ..lint_default_options([Linter::Pydocstyle.into()])
+                },
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_infers_plugins_if_omitted() {
+        let actual = convert(
+            &HashMap::from([(
+                "flake8".to_string(),
+                HashMap::from([("inline-quotes".to_string(), Some("single".to_string()))]),
+            )]),
+            &ExternalConfig::default(),
+            None,
+        );
+        let expected = Pyproject::new(Options {
+            lint: Some(LintOptions {
+                common: LintCommonOptions {
+                    flake8_quotes: Some(Flake8QuotesOptions {
+                        inline_quotes: Some(flake8_quotes::settings::Quote::Single),
+                        multiline_quotes: None,
+                        docstring_quotes: None,
+                        avoid_escape: None,
+                    }),
+                    ..lint_default_options([Linter::Flake8Quotes.into()])
+                },
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_converts_project_requires_python() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([("flake8".to_string(), HashMap::default())]),
+            &ExternalConfig {
+                project: Some(&Project {
+                    requires_python: Some(VersionSpecifiers::from_str(">=3.8.16, <3.11")?),
+                }),
+                ..ExternalConfig::default()
+            },
+            Some(vec![]),
+        );
+        let expected = Pyproject::new(Options {
+            target_version: Some(PythonVersion::Py38),
+            lint: Some(LintOptions {
+                common: lint_default_options([]),
+                ..LintOptions::default()
+            }),
+            ..Options::default()
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}

crates/flake8_to_ruff/src/external_config.rs

@@ -0,0 +1,10 @@
+use super::black::Black;
+use super::isort::Isort;
+use super::pep621::Project;
+
+#[derive(Default)]
+pub(crate) struct ExternalConfig<'a> {
+    pub(crate) black: Option<&'a Black>,
+    pub(crate) isort: Option<&'a Isort>,
+    pub(crate) project: Option<&'a Project>,
+}

crates/flake8_to_ruff/src/isort.rs

@@ -0,0 +1,10 @@
+//! Extract isort configuration settings from a pyproject.toml.
+
+use serde::{Deserialize, Serialize};
+
+/// The [isort configuration](https://pycqa.github.io/isort/docs/configuration/config_files.html).
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub(crate) struct Isort {
+    #[serde(alias = "src-paths", alias = "src_paths")]
+    pub(crate) src_paths: Option<Vec<String>>,
+}

crates/flake8_to_ruff/src/main.rs

@@ -0,0 +1,80 @@
+//! Utility to generate Ruff's `pyproject.toml` section from a Flake8 INI file.
+
+mod black;
+mod converter;
+mod external_config;
+mod isort;
+mod parser;
+mod pep621;
+mod plugin;
+mod pyproject;
+
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::Parser;
+use configparser::ini::Ini;
+
+use crate::converter::convert;
+use crate::external_config::ExternalConfig;
+use crate::plugin::Plugin;
+use crate::pyproject::parse;
+use ruff_linter::logging::{set_up_logging, LogLevel};
+
+#[derive(Parser)]
+#[command(
+    about = "Convert existing Flake8 configuration to Ruff.",
+    long_about = None
+)]
+struct Args {
+    /// Path to the Flake8 configuration file (e.g., `setup.cfg`, `tox.ini`, or
+    /// `.flake8`).
+    #[arg(required = true)]
+    file: PathBuf,
+    /// Optional path to a `pyproject.toml` file, used to ensure compatibility
+    /// with Black.
+    #[arg(long)]
+    pyproject: Option<PathBuf>,
+    /// List of plugins to enable.
+    #[arg(long, value_delimiter = ',')]
+    plugin: Option<Vec<Plugin>>,
+}
+
+fn main() -> Result<()> {
+    set_up_logging(&LogLevel::Default)?;
+
+    let args = Args::parse();
+
+    // Read the INI file.
+    let mut ini = Ini::new_cs();
+    ini.set_multiline(true);
+    let config = ini.load(args.file).map_err(|msg| anyhow::anyhow!(msg))?;
+
+    // Read the pyproject.toml file.
+    let pyproject = args.pyproject.map(parse).transpose()?;
+    let external_config = pyproject
+        .as_ref()
+        .and_then(|pyproject| pyproject.tool.as_ref())
+        .map(|tool| ExternalConfig {
+            black: tool.black.as_ref(),
+            isort: tool.isort.as_ref(),
+            ..Default::default()
+        })
+        .unwrap_or_default();
+    let external_config = ExternalConfig {
+        project: pyproject
+            .as_ref()
+            .and_then(|pyproject| pyproject.project.as_ref()),
+        ..external_config
+    };
+
+    // Create Ruff's pyproject.toml section.
+    let pyproject = convert(&config, &external_config, args.plugin);
+
+    #[allow(clippy::print_stdout)]
+    {
+        println!("{}", toml::to_string_pretty(&pyproject)?);
+    }
+
+    Ok(())
+}

crates/flake8_to_ruff/src/parser.rs

@@ -0,0 +1,391 @@
+use std::str::FromStr;
+
+use anyhow::{bail, Result};
+use once_cell::sync::Lazy;
+use regex::Regex;
+use rustc_hash::FxHashMap;
+
+use ruff_linter::settings::types::PatternPrefixPair;
+use ruff_linter::{warn_user, RuleSelector};
+
+static COMMA_SEPARATED_LIST_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").unwrap());
+
+/// Parse a comma-separated list of `RuleSelector` values (e.g.,
+/// "F401,E501").
+pub(crate) fn parse_prefix_codes(value: &str) -> Vec<RuleSelector> {
+    let mut codes: Vec<RuleSelector> = vec![];
+    for code in COMMA_SEPARATED_LIST_RE.split(value) {
+        let code = code.trim();
+        if code.is_empty() {
+            continue;
+        }
+        if let Ok(code) = RuleSelector::from_str(code) {
+            codes.push(code);
+        } else {
+            warn_user!("Unsupported prefix code: {code}");
+        }
+    }
+    codes
+}
+
+/// Parse a comma-separated list of strings (e.g., "__init__.py,__main__.py").
+pub(crate) fn parse_strings(value: &str) -> Vec<String> {
+    COMMA_SEPARATED_LIST_RE
+        .split(value)
+        .map(str::trim)
+        .filter(|part| !part.is_empty())
+        .map(String::from)
+        .collect()
+}
+
+/// Parse a boolean.
+pub(crate) fn parse_bool(value: &str) -> Result<bool> {
+    match value.trim() {
+        "true" => Ok(true),
+        "false" => Ok(false),
+        _ => bail!("Unexpected boolean value: {value}"),
+    }
+}
+
+#[derive(Debug)]
+struct Token {
+    token_name: TokenType,
+    src: String,
+}
+
+#[derive(Debug, Copy, Clone)]
+enum TokenType {
+    Code,
+    File,
+    Colon,
+    Comma,
+    Ws,
+    Eof,
+}
+
+struct State {
+    seen_sep: bool,
+    seen_colon: bool,
+    filenames: Vec<String>,
+    codes: Vec<String>,
+}
+
+impl State {
+    const fn new() -> Self {
+        Self {
+            seen_sep: true,
+            seen_colon: false,
+            filenames: vec![],
+            codes: vec![],
+        }
+    }
+
+    /// Generate the list of `StrRuleCodePair` pairs for the current
+    /// state.
+    fn parse(&self) -> Vec<PatternPrefixPair> {
+        let mut codes: Vec<PatternPrefixPair> = vec![];
+        for code in &self.codes {
+            if let Ok(code) = RuleSelector::from_str(code) {
+                for filename in &self.filenames {
+                    codes.push(PatternPrefixPair {
+                        pattern: filename.clone(),
+                        prefix: code.clone(),
+                    });
+                }
+            } else {
+                warn_user!("Unsupported prefix code: {code}");
+            }
+        }
+        codes
+    }
+}
+
+/// Tokenize the raw 'files-to-codes' mapping.
+fn tokenize_files_to_codes_mapping(value: &str) -> Vec<Token> {
+    let mut tokens = vec![];
+    let mut i = 0;
+    while i < value.len() {
+        for (token_re, token_name) in [
+            (
+                Regex::new(r"([A-Z]+[0-9]*)(?:$|\s|,)").unwrap(),
+                TokenType::Code,
+            ),
+            (Regex::new(r"([^\s:,]+)").unwrap(), TokenType::File),
+            (Regex::new(r"(\s*:\s*)").unwrap(), TokenType::Colon),
+            (Regex::new(r"(\s*,\s*)").unwrap(), TokenType::Comma),
+            (Regex::new(r"(\s+)").unwrap(), TokenType::Ws),
+        ] {
+            if let Some(cap) = token_re.captures(&value[i..]) {
+                let mat = cap.get(1).unwrap();
+                if mat.start() == 0 {
+                    tokens.push(Token {
+                        token_name,
+                        src: mat.as_str().trim().to_string(),
+                    });
+                    i += mat.end();
+                    break;
+                }
+            }
+        }
+    }
+    tokens.push(Token {
+        token_name: TokenType::Eof,
+        src: String::new(),
+    });
+    tokens
+}
+
+/// Parse a 'files-to-codes' mapping, mimicking Flake8's internal logic.
+/// See: <https://github.com/PyCQA/flake8/blob/7dfe99616fc2f07c0017df2ba5fa884158f3ea8a/src/flake8/utils.py#L45>
+pub(crate) fn parse_files_to_codes_mapping(value: &str) -> Result<Vec<PatternPrefixPair>> {
+    if value.trim().is_empty() {
+        return Ok(vec![]);
+    }
+    let mut codes: Vec<PatternPrefixPair> = vec![];
+    let mut state = State::new();
+    for token in tokenize_files_to_codes_mapping(value) {
+        if matches!(token.token_name, TokenType::Comma | TokenType::Ws) {
+            state.seen_sep = true;
+        } else if !state.seen_colon {
+            if matches!(token.token_name, TokenType::Colon) {
+                state.seen_colon = true;
+                state.seen_sep = true;
+            } else if state.seen_sep && matches!(token.token_name, TokenType::File) {
+                state.filenames.push(token.src);
+                state.seen_sep = false;
+            } else {
+                bail!("Unexpected token: {:?}", token.token_name);
+            }
+        } else {
+            if matches!(token.token_name, TokenType::Eof) {
+                codes.extend(state.parse());
+                state = State::new();
+            } else if state.seen_sep && matches!(token.token_name, TokenType::Code) {
+                state.codes.push(token.src);
+                state.seen_sep = false;
+            } else if state.seen_sep && matches!(token.token_name, TokenType::File) {
+                codes.extend(state.parse());
+                state = State::new();
+                state.filenames.push(token.src);
+                state.seen_sep = false;
+            } else {
+                bail!("Unexpected token: {:?}", token.token_name);
+            }
+        }
+    }
+    Ok(codes)
+}
+
+/// Collect a list of `PatternPrefixPair` structs as a `BTreeMap`.
+pub(crate) fn collect_per_file_ignores(
+    pairs: Vec<PatternPrefixPair>,
+) -> FxHashMap<String, Vec<RuleSelector>> {
+    let mut per_file_ignores: FxHashMap<String, Vec<RuleSelector>> = FxHashMap::default();
+    for pair in pairs {
+        per_file_ignores
+            .entry(pair.pattern)
+            .or_default()
+            .push(pair.prefix);
+    }
+    per_file_ignores
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+
+    use ruff_linter::codes;
+    use ruff_linter::registry::Linter;
+    use ruff_linter::settings::types::PatternPrefixPair;
+    use ruff_linter::RuleSelector;
+
+    use super::{parse_files_to_codes_mapping, parse_prefix_codes, parse_strings};
+
+    #[test]
+    fn it_parses_prefix_codes() {
+        let actual = parse_prefix_codes("");
+        let expected: Vec<RuleSelector> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes(" ");
+        let expected: Vec<RuleSelector> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401");
+        let expected = vec![codes::Pyflakes::_401.into()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401,");
+        let expected = vec![codes::Pyflakes::_401.into()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401,E501");
+        let expected = vec![
+            codes::Pyflakes::_401.into(),
+            codes::Pycodestyle::E501.into(),
+        ];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401, E501");
+        let expected = vec![
+            codes::Pyflakes::_401.into(),
+            codes::Pycodestyle::E501.into(),
+        ];
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_parses_strings() {
+        let actual = parse_strings("");
+        let expected: Vec<String> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings(" ");
+        let expected: Vec<String> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py");
+        let expected = vec!["__init__.py".to_string()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py,");
+        let expected = vec!["__init__.py".to_string()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py,__main__.py");
+        let expected = vec!["__init__.py".to_string(), "__main__.py".to_string()];
+        assert_eq!(actual, expected);
+
+        let actual = parse_strings("__init__.py, __main__.py");
+        let expected = vec!["__init__.py".to_string(), "__main__.py".to_string()];
+        assert_eq!(actual, expected);
+    }
+
+    #[test]
+    fn it_parse_files_to_codes_mapping() -> Result<()> {
+        let actual = parse_files_to_codes_mapping("")?;
+        let expected: Vec<PatternPrefixPair> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_files_to_codes_mapping(" ")?;
+        let expected: Vec<PatternPrefixPair> = vec![];
+        assert_eq!(actual, expected);
+
+        // Ex) locust
+        let actual = parse_files_to_codes_mapping(
+            "per-file-ignores =
+    locust/test/*: F841
+    examples/*: F841
+    *.pyi: E302,E704"
+                .strip_prefix("per-file-ignores =")
+                .unwrap(),
+        )?;
+        let expected: Vec<PatternPrefixPair> = vec![
+            PatternPrefixPair {
+                pattern: "locust/test/*".to_string(),
+                prefix: codes::Pyflakes::_841.into(),
+            },
+            PatternPrefixPair {
+                pattern: "examples/*".to_string(),
+                prefix: codes::Pyflakes::_841.into(),
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        // Ex) celery
+        let actual = parse_files_to_codes_mapping(
+            "per-file-ignores =
+   t/*,setup.py,examples/*,docs/*,extra/*:
+       D,"
+            .strip_prefix("per-file-ignores =")
+            .unwrap(),
+        )?;
+        let expected: Vec<PatternPrefixPair> = vec![
+            PatternPrefixPair {
+                pattern: "t/*".to_string(),
+                prefix: Linter::Pydocstyle.into(),
+            },
+            PatternPrefixPair {
+                pattern: "setup.py".to_string(),
+                prefix: Linter::Pydocstyle.into(),
+            },
+            PatternPrefixPair {
+                pattern: "examples/*".to_string(),
+                prefix: Linter::Pydocstyle.into(),
+            },
+            PatternPrefixPair {
+                pattern: "docs/*".to_string(),
+                prefix: Linter::Pydocstyle.into(),
+            },
+            PatternPrefixPair {
+                pattern: "extra/*".to_string(),
+                prefix: Linter::Pydocstyle.into(),
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        // Ex) scrapy
+        let actual = parse_files_to_codes_mapping(
+            "per-file-ignores =
+    scrapy/__init__.py:E402
+    scrapy/core/downloader/handlers/http.py:F401
+    scrapy/http/__init__.py:F401
+    scrapy/linkextractors/__init__.py:E402,F401
+    scrapy/selector/__init__.py:F401
+    scrapy/spiders/__init__.py:E402,F401
+    scrapy/utils/url.py:F403,F405
+    tests/test_loader.py:E741"
+                .strip_prefix("per-file-ignores =")
+                .unwrap(),
+        )?;
+        let expected: Vec<PatternPrefixPair> = vec![
+            PatternPrefixPair {
+                pattern: "scrapy/__init__.py".to_string(),
+                prefix: codes::Pycodestyle::E402.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/core/downloader/handlers/http.py".to_string(),
+                prefix: codes::Pyflakes::_401.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/http/__init__.py".to_string(),
+                prefix: codes::Pyflakes::_401.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/linkextractors/__init__.py".to_string(),
+                prefix: codes::Pycodestyle::E402.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/linkextractors/__init__.py".to_string(),
+                prefix: codes::Pyflakes::_401.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/selector/__init__.py".to_string(),
+                prefix: codes::Pyflakes::_401.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/spiders/__init__.py".to_string(),
+                prefix: codes::Pycodestyle::E402.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/spiders/__init__.py".to_string(),
+                prefix: codes::Pyflakes::_401.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/utils/url.py".to_string(),
+                prefix: codes::Pyflakes::_403.into(),
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/utils/url.py".to_string(),
+                prefix: codes::Pyflakes::_405.into(),
+            },
+            PatternPrefixPair {
+                pattern: "tests/test_loader.py".to_string(),
+                prefix: codes::Pycodestyle::E741.into(),
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}

crates/flake8_to_ruff/src/pep621.rs

@@ -0,0 +1,10 @@
+//! Extract PEP 621 configuration settings from a pyproject.toml.
+
+use pep440_rs::VersionSpecifiers;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub(crate) struct Project {
+    #[serde(alias = "requires-python", alias = "requires_python")]
+    pub(crate) requires_python: Option<VersionSpecifiers>,
+}

crates/flake8_to_ruff/src/plugin.rs

@@ -0,0 +1,368 @@
+use std::collections::{BTreeSet, HashMap, HashSet};
+use std::fmt;
+use std::str::FromStr;
+
+use anyhow::anyhow;
+use ruff_linter::registry::Linter;
+use ruff_linter::rule_selector::PreviewOptions;
+use ruff_linter::RuleSelector;
+
+#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
+pub enum Plugin {
+    Flake82020,
+    Flake8Annotations,
+    Flake8Bandit,
+    Flake8BlindExcept,
+    Flake8BooleanTrap,
+    Flake8Bugbear,
+    Flake8Builtins,
+    Flake8Commas,
+    Flake8Comprehensions,
+    Flake8Datetimez,
+    Flake8Debugger,
+    Flake8Docstrings,
+    Flake8Eradicate,
+    Flake8ErrMsg,
+    Flake8Executable,
+    Flake8ImplicitStrConcat,
+    Flake8ImportConventions,
+    Flake8NoPep420,
+    Flake8Pie,
+    Flake8Print,
+    Flake8PytestStyle,
+    Flake8Quotes,
+    Flake8Return,
+    Flake8Simplify,
+    Flake8TidyImports,
+    Flake8TypeChecking,
+    Flake8UnusedArguments,
+    Flake8UsePathlib,
+    McCabe,
+    PEP8Naming,
+    PandasVet,
+    Pyupgrade,
+    Tryceratops,
+}
+
+impl FromStr for Plugin {
+    type Err = anyhow::Error;
+
+    fn from_str(string: &str) -> Result<Self, Self::Err> {
+        match string {
+            "flake8-2020" => Ok(Plugin::Flake82020),
+            "flake8-annotations" => Ok(Plugin::Flake8Annotations),
+            "flake8-bandit" => Ok(Plugin::Flake8Bandit),
+            "flake8-blind-except" => Ok(Plugin::Flake8BlindExcept),
+            "flake8-boolean-trap" => Ok(Plugin::Flake8BooleanTrap),
+            "flake8-bugbear" => Ok(Plugin::Flake8Bugbear),
+            "flake8-builtins" => Ok(Plugin::Flake8Builtins),
+            "flake8-commas" => Ok(Plugin::Flake8Commas),
+            "flake8-comprehensions" => Ok(Plugin::Flake8Comprehensions),
+            "flake8-datetimez" => Ok(Plugin::Flake8Datetimez),
+            "flake8-debugger" => Ok(Plugin::Flake8Debugger),
+            "flake8-docstrings" => Ok(Plugin::Flake8Docstrings),
+            "flake8-eradicate" => Ok(Plugin::Flake8Eradicate),
+            "flake8-errmsg" => Ok(Plugin::Flake8ErrMsg),
+            "flake8-executable" => Ok(Plugin::Flake8Executable),
+            "flake8-implicit-str-concat" => Ok(Plugin::Flake8ImplicitStrConcat),
+            "flake8-import-conventions" => Ok(Plugin::Flake8ImportConventions),
+            "flake8-no-pep420" => Ok(Plugin::Flake8NoPep420),
+            "flake8-pie" => Ok(Plugin::Flake8Pie),
+            "flake8-print" => Ok(Plugin::Flake8Print),
+            "flake8-pytest-style" => Ok(Plugin::Flake8PytestStyle),
+            "flake8-quotes" => Ok(Plugin::Flake8Quotes),
+            "flake8-return" => Ok(Plugin::Flake8Return),
+            "flake8-simplify" => Ok(Plugin::Flake8Simplify),
+            "flake8-tidy-imports" => Ok(Plugin::Flake8TidyImports),
+            "flake8-type-checking" => Ok(Plugin::Flake8TypeChecking),
+            "flake8-unused-arguments" => Ok(Plugin::Flake8UnusedArguments),
+            "flake8-use-pathlib" => Ok(Plugin::Flake8UsePathlib),
+            "mccabe" => Ok(Plugin::McCabe),
+            "pep8-naming" => Ok(Plugin::PEP8Naming),
+            "pandas-vet" => Ok(Plugin::PandasVet),
+            "pyupgrade" => Ok(Plugin::Pyupgrade),
+            "tryceratops" => Ok(Plugin::Tryceratops),
+            _ => Err(anyhow!("Unknown plugin: {string}")),
+        }
+    }
+}
+
+impl fmt::Debug for Plugin {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Plugin::Flake82020 => "flake8-2020",
+                Plugin::Flake8Annotations => "flake8-annotations",
+                Plugin::Flake8Bandit => "flake8-bandit",
+                Plugin::Flake8BlindExcept => "flake8-blind-except",
+                Plugin::Flake8BooleanTrap => "flake8-boolean-trap",
+                Plugin::Flake8Bugbear => "flake8-bugbear",
+                Plugin::Flake8Builtins => "flake8-builtins",
+                Plugin::Flake8Commas => "flake8-commas",
+                Plugin::Flake8Comprehensions => "flake8-comprehensions",
+                Plugin::Flake8Datetimez => "flake8-datetimez",
+                Plugin::Flake8Debugger => "flake8-debugger",
+                Plugin::Flake8Docstrings => "flake8-docstrings",
+                Plugin::Flake8Eradicate => "flake8-eradicate",
+                Plugin::Flake8ErrMsg => "flake8-errmsg",
+                Plugin::Flake8Executable => "flake8-executable",
+                Plugin::Flake8ImplicitStrConcat => "flake8-implicit-str-concat",
+                Plugin::Flake8ImportConventions => "flake8-import-conventions",
+                Plugin::Flake8NoPep420 => "flake8-no-pep420",
+                Plugin::Flake8Pie => "flake8-pie",
+                Plugin::Flake8Print => "flake8-print",
+                Plugin::Flake8PytestStyle => "flake8-pytest-style",
+                Plugin::Flake8Quotes => "flake8-quotes",
+                Plugin::Flake8Return => "flake8-return",
+                Plugin::Flake8Simplify => "flake8-simplify",
+                Plugin::Flake8TidyImports => "flake8-tidy-imports",
+                Plugin::Flake8TypeChecking => "flake8-type-checking",
+                Plugin::Flake8UnusedArguments => "flake8-unused-arguments",
+                Plugin::Flake8UsePathlib => "flake8-use-pathlib",
+                Plugin::McCabe => "mccabe",
+                Plugin::PEP8Naming => "pep8-naming",
+                Plugin::PandasVet => "pandas-vet",
+                Plugin::Pyupgrade => "pyupgrade",
+                Plugin::Tryceratops => "tryceratops",
+            }
+        )
+    }
+}
+
+impl From<&Plugin> for Linter {
+    fn from(plugin: &Plugin) -> Self {
+        match plugin {
+            Plugin::Flake82020 => Linter::Flake82020,
+            Plugin::Flake8Annotations => Linter::Flake8Annotations,
+            Plugin::Flake8Bandit => Linter::Flake8Bandit,
+            Plugin::Flake8BlindExcept => Linter::Flake8BlindExcept,
+            Plugin::Flake8BooleanTrap => Linter::Flake8BooleanTrap,
+            Plugin::Flake8Bugbear => Linter::Flake8Bugbear,
+            Plugin::Flake8Builtins => Linter::Flake8Builtins,
+            Plugin::Flake8Commas => Linter::Flake8Commas,
+            Plugin::Flake8Comprehensions => Linter::Flake8Comprehensions,
+            Plugin::Flake8Datetimez => Linter::Flake8Datetimez,
+            Plugin::Flake8Debugger => Linter::Flake8Debugger,
+            Plugin::Flake8Docstrings => Linter::Pydocstyle,
+            Plugin::Flake8Eradicate => Linter::Eradicate,
+            Plugin::Flake8ErrMsg => Linter::Flake8ErrMsg,
+            Plugin::Flake8Executable => Linter::Flake8Executable,
+            Plugin::Flake8ImplicitStrConcat => Linter::Flake8ImplicitStrConcat,
+            Plugin::Flake8ImportConventions => Linter::Flake8ImportConventions,
+            Plugin::Flake8NoPep420 => Linter::Flake8NoPep420,
+            Plugin::Flake8Pie => Linter::Flake8Pie,
+            Plugin::Flake8Print => Linter::Flake8Print,
+            Plugin::Flake8PytestStyle => Linter::Flake8PytestStyle,
+            Plugin::Flake8Quotes => Linter::Flake8Quotes,
+            Plugin::Flake8Return => Linter::Flake8Return,
+            Plugin::Flake8Simplify => Linter::Flake8Simplify,
+            Plugin::Flake8TidyImports => Linter::Flake8TidyImports,
+            Plugin::Flake8TypeChecking => Linter::Flake8TypeChecking,
+            Plugin::Flake8UnusedArguments => Linter::Flake8UnusedArguments,
+            Plugin::Flake8UsePathlib => Linter::Flake8UsePathlib,
+            Plugin::McCabe => Linter::McCabe,
+            Plugin::PEP8Naming => Linter::PEP8Naming,
+            Plugin::PandasVet => Linter::PandasVet,
+            Plugin::Pyupgrade => Linter::Pyupgrade,
+            Plugin::Tryceratops => Linter::Tryceratops,
+        }
+    }
+}
+
+/// Infer the enabled plugins based on user-provided options.
+///
+/// For example, if the user specified a `mypy-init-return` setting, we should
+/// infer that `flake8-annotations` is active.
+pub(crate) fn infer_plugins_from_options(flake8: &HashMap<String, Option<String>>) -> Vec<Plugin> {
+    let mut plugins = BTreeSet::new();
+    for key in flake8.keys() {
+        match key.as_str() {
+            // flake8-annotations
+            "suppress-none-returning" | "suppress_none_returning" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "suppress-dummy-args" | "suppress_dummy_args" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "allow-untyped-defs" | "allow_untyped_defs" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "allow-untyped-nested" | "allow_untyped_nested" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "mypy-init-return" | "mypy_init_return" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "dispatch-decorators" | "dispatch_decorators" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "overload-decorators" | "overload_decorators" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            "allow-star-arg-any" | "allow_star_arg_any" => {
+                plugins.insert(Plugin::Flake8Annotations);
+            }
+            // flake8-bugbear
+            "extend-immutable-calls" | "extend_immutable_calls" => {
+                plugins.insert(Plugin::Flake8Bugbear);
+            }
+            // flake8-builtins
+            "builtins-ignorelist" | "builtins_ignorelist" => {
+                plugins.insert(Plugin::Flake8Builtins);
+            }
+            // flake8-docstrings
+            "docstring-convention" | "docstring_convention" => {
+                plugins.insert(Plugin::Flake8Docstrings);
+            }
+            // flake8-eradicate
+            "eradicate-aggressive" | "eradicate_aggressive" => {
+                plugins.insert(Plugin::Flake8Eradicate);
+            }
+            "eradicate-whitelist" | "eradicate_whitelist" => {
+                plugins.insert(Plugin::Flake8Eradicate);
+            }
+            "eradicate-whitelist-extend" | "eradicate_whitelist_extend" => {
+                plugins.insert(Plugin::Flake8Eradicate);
+            }
+            // flake8-pytest-style
+            "pytest-fixture-no-parentheses" | "pytest_fixture_no_parentheses " => {
+                plugins.insert(Plugin::Flake8PytestStyle);
+            }
+            "pytest-parametrize-names-type" | "pytest_parametrize_names_type" => {
+                plugins.insert(Plugin::Flake8PytestStyle);
+            }
+            "pytest-parametrize-values-type" | "pytest_parametrize_values_type" => {
+                plugins.insert(Plugin::Flake8PytestStyle);
+            }
+            "pytest-parametrize-values-row-type" | "pytest_parametrize_values_row_type" => {
+                plugins.insert(Plugin::Flake8PytestStyle);
+            }
+            "pytest-raises-require-match-for" | "pytest_raises_require_match_for" => {
+                plugins.insert(Plugin::Flake8PytestStyle);
+            }
+            "pytest-mark-no-parentheses" | "pytest_mark_no_parentheses" => {
+                plugins.insert(Plugin::Flake8PytestStyle);
+            }
+            // flake8-quotes
+            "quotes" | "inline-quotes" | "inline_quotes" => {
+                plugins.insert(Plugin::Flake8Quotes);
+            }
+            "multiline-quotes" | "multiline_quotes" => {
+                plugins.insert(Plugin::Flake8Quotes);
+            }
+            "docstring-quotes" | "docstring_quotes" => {
+                plugins.insert(Plugin::Flake8Quotes);
+            }
+            "avoid-escape" | "avoid_escape" => {
+                plugins.insert(Plugin::Flake8Quotes);
+            }
+            // flake8-tidy-imports
+            "ban-relative-imports" | "ban_relative_imports" => {
+                plugins.insert(Plugin::Flake8TidyImports);
+            }
+            "banned-modules" | "banned_modules" => {
+                plugins.insert(Plugin::Flake8TidyImports);
+            }
+            // mccabe
+            "max-complexity" | "max_complexity" => {
+                plugins.insert(Plugin::McCabe);
+            }
+            // pep8-naming
+            "ignore-names" | "ignore_names" => {
+                plugins.insert(Plugin::PEP8Naming);
+            }
+            "classmethod-decorators" | "classmethod_decorators" => {
+                plugins.insert(Plugin::PEP8Naming);
+            }
+            "staticmethod-decorators" | "staticmethod_decorators" => {
+                plugins.insert(Plugin::PEP8Naming);
+            }
+            "max-string-length" | "max_string_length" => {
+                plugins.insert(Plugin::Flake8ErrMsg);
+            }
+            _ => {}
+        }
+    }
+    Vec::from_iter(plugins)
+}
+
+/// Infer the enabled plugins based on the referenced prefixes.
+///
+/// For example, if the user ignores `ANN101`, we should infer that
+/// `flake8-annotations` is active.
+pub(crate) fn infer_plugins_from_codes(selectors: &HashSet<RuleSelector>) -> Vec<Plugin> {
+    // Ignore cases in which we've knowingly changed rule prefixes.
+    [
+        Plugin::Flake82020,
+        Plugin::Flake8Annotations,
+        Plugin::Flake8Bandit,
+        // Plugin::Flake8BlindExcept,
+        Plugin::Flake8BooleanTrap,
+        Plugin::Flake8Bugbear,
+        Plugin::Flake8Builtins,
+        // Plugin::Flake8Commas,
+        Plugin::Flake8Comprehensions,
+        Plugin::Flake8Datetimez,
+        Plugin::Flake8Debugger,
+        Plugin::Flake8Docstrings,
+        // Plugin::Flake8Eradicate,
+        Plugin::Flake8ErrMsg,
+        Plugin::Flake8Executable,
+        Plugin::Flake8ImplicitStrConcat,
+        // Plugin::Flake8ImportConventions,
+        Plugin::Flake8NoPep420,
+        Plugin::Flake8Pie,
+        Plugin::Flake8Print,
+        Plugin::Flake8PytestStyle,
+        Plugin::Flake8Quotes,
+        Plugin::Flake8Return,
+        Plugin::Flake8Simplify,
+        // Plugin::Flake8TidyImports,
+        // Plugin::Flake8TypeChecking,
+        Plugin::Flake8UnusedArguments,
+        // Plugin::Flake8UsePathlib,
+        Plugin::McCabe,
+        Plugin::PEP8Naming,
+        Plugin::PandasVet,
+        Plugin::Tryceratops,
+    ]
+    .into_iter()
+    .filter(|plugin| {
+        for selector in selectors {
+            if selector
+                .rules(&PreviewOptions::default())
+                .any(|rule| Linter::from(plugin).rules().any(|r| r == rule))
+            {
+                return true;
+            }
+        }
+        false
+    })
+    .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+
+    use super::{infer_plugins_from_options, Plugin};
+
+    #[test]
+    fn it_infers_plugins() {
+        let actual = infer_plugins_from_options(&HashMap::from([(
+            "inline-quotes".to_string(),
+            Some("single".to_string()),
+        )]));
+        let expected = vec![Plugin::Flake8Quotes];
+        assert_eq!(actual, expected);
+
+        let actual = infer_plugins_from_options(&HashMap::from([(
+            "staticmethod-decorators".to_string(),
+            Some("[]".to_string()),
+        )]));
+        let expected = vec![Plugin::PEP8Naming];
+        assert_eq!(actual, expected);
+    }
+}

crates/flake8_to_ruff/src/pyproject.rs

@@ -0,0 +1,26 @@
+use std::path::Path;
+
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+
+use super::black::Black;
+use super::isort::Isort;
+use super::pep621::Project;
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub(crate) struct Tools {
+    pub(crate) black: Option<Black>,
+    pub(crate) isort: Option<Isort>,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub(crate) struct Pyproject {
+    pub(crate) tool: Option<Tools>,
+    pub(crate) project: Option<Project>,
+}
+
+pub(crate) fn parse<P: AsRef<Path>>(path: P) -> Result<Pyproject> {
+    let contents = std::fs::read_to_string(path)?;
+    let pyproject = toml::from_str::<Pyproject>(&contents)?;
+    Ok(pyproject)
+}

crates/ruff_benchmark/Cargo.toml

@@ -0,0 +1,56 @@
+[package]
+name = "ruff_benchmark"
+version = "0.0.0"
+description = "Ruff Micro-benchmarks"
+publish = false
+authors = { workspace = true }
+edition = { workspace = true }
+rust-version = { workspace = true }
+homepage = { workspace = true }
+documentation = { workspace = true }
+repository = { workspace = true }
+license = { workspace = true }
+
+[lib]
+bench = false
+
+[[bench]]
+name = "linter"
+harness = false
+
+[[bench]]
+name = "lexer"
+harness = false
+
+[[bench]]
+name = "parser"
+harness = false
+
+[[bench]]
+name = "formatter"
+harness = false
+
+[dependencies]
+once_cell.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+url = "2.3.1"
+ureq = "2.8.0"
+criterion = { version = "0.5.1", default-features = false }
+codspeed-criterion-compat = { version="2.3.1", default-features = false, optional = true}
+
+[dev-dependencies]
+ruff_linter.path = "../ruff_linter"
+ruff_python_ast.path = "../ruff_python_ast"
+ruff_python_formatter = { path = "../ruff_python_formatter" }
+ruff_python_index = { path = "../ruff_python_index" }
+ruff_python_parser = { path = "../ruff_python_parser" }
+
+[features]
+codspeed = ["codspeed-criterion-compat"]
+
+[target.'cfg(target_os = "windows")'.dev-dependencies]
+mimalloc = "0.1.39"
+
+[target.'cfg(all(not(target_os = "windows"), not(target_os = "openbsd"), any(target_arch = "x86_64", target_arch = "aarch64", target_arch = "powerpc64")))'.dev-dependencies]
+tikv-jemallocator = "0.5.0"

crates/ruff_benchmark/README.md

@@ -0,0 +1,5 @@
+# Ruff Benchmarks
+
+The `ruff_benchmark` crate benchmarks the linter and the formatter on individual files.
+
+See [CONTRIBUTING.md](../../CONTRIBUTING.md) on how to use these benchmarks.

crates/ruff_benchmark/benches/formatter.rs

@@ -0,0 +1,87 @@
+use std::path::Path;
+
+use ruff_benchmark::criterion::{
+    criterion_group, criterion_main, BenchmarkId, Criterion, Throughput,
+};
+use ruff_benchmark::{TestCase, TestFile, TestFileDownloadError};
+use ruff_python_formatter::{format_module_ast, PyFormatOptions};
+use ruff_python_index::CommentRangesBuilder;
+use ruff_python_parser::lexer::lex;
+use ruff_python_parser::{parse_tokens, Mode};
+
+#[cfg(target_os = "windows")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
+#[cfg(all(
+    not(target_os = "windows"),
+    not(target_os = "openbsd"),
+    any(
+        target_arch = "x86_64",
+        target_arch = "aarch64",
+        target_arch = "powerpc64"
+    )
+))]
+#[global_allocator]
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
+fn create_test_cases() -> Result<Vec<TestCase>, TestFileDownloadError> {
+    Ok(vec![
+        TestCase::fast(TestFile::try_download("numpy/globals.py", "https://raw.githubusercontent.com/numpy/numpy/89d64415e349ca75a25250f22b874aa16e5c0973/numpy/_globals.py")?),
+        TestCase::fast(TestFile::try_download("unicode/pypinyin.py", "https://raw.githubusercontent.com/mozillazg/python-pinyin/9521e47d96e3583a5477f5e43a2e82d513f27a3f/pypinyin/standard.py")?),
+        TestCase::normal(TestFile::try_download(
+            "pydantic/types.py",
+            "https://raw.githubusercontent.com/pydantic/pydantic/83b3c49e99ceb4599d9286a3d793cea44ac36d4b/pydantic/types.py",
+        )?),
+        TestCase::normal(TestFile::try_download("numpy/ctypeslib.py", "https://raw.githubusercontent.com/numpy/numpy/e42c9503a14d66adfd41356ef5640c6975c45218/numpy/ctypeslib.py")?),
+        TestCase::slow(TestFile::try_download(
+            "large/dataset.py",
+            "https://raw.githubusercontent.com/DHI/mikeio/b7d26418f4db2909b0aa965253dbe83194d7bb5b/tests/test_dataset.py",
+        )?),
+    ])
+}
+
+fn benchmark_formatter(criterion: &mut Criterion) {
+    let mut group = criterion.benchmark_group("formatter");
+    let test_cases = create_test_cases().unwrap();
+
+    for case in test_cases {
+        group.throughput(Throughput::Bytes(case.code().len() as u64));
+
+        group.bench_with_input(
+            BenchmarkId::from_parameter(case.name()),
+            &case,
+            |b, case| {
+                let mut tokens = Vec::new();
+                let mut comment_ranges = CommentRangesBuilder::default();
+
+                for result in lex(case.code(), Mode::Module) {
+                    let (token, range) = result.expect("Input to be a valid python program.");
+
+                    comment_ranges.visit_token(&token, range);
+                    tokens.push(Ok((token, range)));
+                }
+
+                let comment_ranges = comment_ranges.finish();
+
+                // Parse the AST.
+                let module = parse_tokens(tokens, case.code(), Mode::Module, "<filename>")
+                    .expect("Input to be a valid python program");
+
+                b.iter(|| {
+                    let options = PyFormatOptions::from_extension(Path::new(case.name()));
+                    let formatted =
+                        format_module_ast(&module, &comment_ranges, case.code(), options)
+                            .expect("Formatting to succeed");
+
+                    formatted.print().expect("Printing to succeed")
+                });
+            },
+        );
+    }
+
+    group.finish();
+}
+
+criterion_group!(formatter, benchmark_formatter);
+criterion_main!(formatter);

crates/ruff_benchmark/benches/lexer.rs

@@ -0,0 +1,62 @@
+use ruff_benchmark::criterion::{
+    criterion_group, criterion_main, measurement::WallTime, BenchmarkId, Criterion, Throughput,
+};
+use ruff_benchmark::{TestCase, TestFile, TestFileDownloadError};
+use ruff_python_parser::{lexer, Mode};
+
+#[cfg(target_os = "windows")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
+#[cfg(all(
+    not(target_os = "windows"),
+    not(target_os = "openbsd"),
+    any(
+        target_arch = "x86_64",
+        target_arch = "aarch64",
+        target_arch = "powerpc64"
+    )
+))]
+#[global_allocator]
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
+fn create_test_cases() -> Result<Vec<TestCase>, TestFileDownloadError> {
+    Ok(vec![
+        TestCase::fast(TestFile::try_download("numpy/globals.py", "https://raw.githubusercontent.com/numpy/numpy/89d64415e349ca75a25250f22b874aa16e5c0973/numpy/_globals.py")?),
+        TestCase::fast(TestFile::try_download("unicode/pypinyin.py", "https://raw.githubusercontent.com/mozillazg/python-pinyin/9521e47d96e3583a5477f5e43a2e82d513f27a3f/pypinyin/standard.py")?),
+        TestCase::normal(TestFile::try_download(
+            "pydantic/types.py",
+            "https://raw.githubusercontent.com/pydantic/pydantic/83b3c49e99ceb4599d9286a3d793cea44ac36d4b/pydantic/types.py",
+        )?),
+        TestCase::normal(TestFile::try_download("numpy/ctypeslib.py", "https://raw.githubusercontent.com/numpy/numpy/e42c9503a14d66adfd41356ef5640c6975c45218/numpy/ctypeslib.py")?),
+        TestCase::slow(TestFile::try_download(
+            "large/dataset.py",
+            "https://raw.githubusercontent.com/DHI/mikeio/b7d26418f4db2909b0aa965253dbe83194d7bb5b/tests/test_dataset.py",
+        )?),
+    ])
+}
+
+fn benchmark_lexer(criterion: &mut Criterion<WallTime>) {
+    let test_cases = create_test_cases().unwrap();
+    let mut group = criterion.benchmark_group("lexer");
+
+    for case in test_cases {
+        group.throughput(Throughput::Bytes(case.code().len() as u64));
+        group.bench_with_input(
+            BenchmarkId::from_parameter(case.name()),
+            &case,
+            |b, case| {
+                b.iter(|| {
+                    let result =
+                        lexer::lex(case.code(), Mode::Module).find(std::result::Result::is_err);
+                    assert_eq!(result, None, "Input to be a valid Python program");
+                });
+            },
+        );
+    }
+
+    group.finish();
+}
+
+criterion_group!(lexer, benchmark_lexer);
+criterion_main!(lexer);

crates/ruff_benchmark/benches/linter.rs

@@ -0,0 +1,99 @@
+use ruff_benchmark::criterion::{
+    criterion_group, criterion_main, BenchmarkGroup, BenchmarkId, Criterion, Throughput,
+};
+use ruff_benchmark::{TestCase, TestFile, TestFileDownloadError};
+use ruff_linter::linter::lint_only;
+use ruff_linter::settings::rule_table::RuleTable;
+use ruff_linter::settings::{flags, LinterSettings};
+use ruff_linter::source_kind::SourceKind;
+use ruff_linter::{registry::Rule, RuleSelector};
+use ruff_python_ast::PySourceType;
+
+#[cfg(target_os = "windows")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
+#[cfg(all(
+    not(target_os = "windows"),
+    not(target_os = "openbsd"),
+    any(
+        target_arch = "x86_64",
+        target_arch = "aarch64",
+        target_arch = "powerpc64"
+    )
+))]
+#[global_allocator]
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
+fn create_test_cases() -> Result<Vec<TestCase>, TestFileDownloadError> {
+    Ok(vec![
+        TestCase::fast(TestFile::try_download("numpy/globals.py", "https://raw.githubusercontent.com/numpy/numpy/89d64415e349ca75a25250f22b874aa16e5c0973/numpy/_globals.py")?),
+        TestCase::fast(TestFile::try_download("unicode/pypinyin.py", "https://raw.githubusercontent.com/mozillazg/python-pinyin/9521e47d96e3583a5477f5e43a2e82d513f27a3f/pypinyin/standard.py")?),
+        TestCase::normal(TestFile::try_download(
+            "pydantic/types.py",
+            "https://raw.githubusercontent.com/pydantic/pydantic/83b3c49e99ceb4599d9286a3d793cea44ac36d4b/pydantic/types.py",
+        )?),
+        TestCase::normal(TestFile::try_download("numpy/ctypeslib.py", "https://raw.githubusercontent.com/numpy/numpy/e42c9503a14d66adfd41356ef5640c6975c45218/numpy/ctypeslib.py")?),
+        TestCase::slow(TestFile::try_download(
+            "large/dataset.py",
+            "https://raw.githubusercontent.com/DHI/mikeio/b7d26418f4db2909b0aa965253dbe83194d7bb5b/tests/test_dataset.py",
+        )?),
+    ])
+}
+
+fn benchmark_linter(mut group: BenchmarkGroup, settings: &LinterSettings) {
+    let test_cases = create_test_cases().unwrap();
+
+    for case in test_cases {
+        group.throughput(Throughput::Bytes(case.code().len() as u64));
+
+        group.bench_with_input(
+            BenchmarkId::from_parameter(case.name()),
+            &case,
+            |b, case| {
+                let kind = SourceKind::Python(case.code().to_string());
+                b.iter(|| {
+                    let path = case.path();
+                    let result = lint_only(
+                        &path,
+                        None,
+                        settings,
+                        flags::Noqa::Enabled,
+                        &kind,
+                        PySourceType::from(path.as_path()),
+                    );
+
+                    // Assert that file contains no parse errors
+                    assert_eq!(result.error, None);
+                });
+            },
+        );
+    }
+
+    group.finish();
+}
+
+fn benchmark_default_rules(criterion: &mut Criterion) {
+    let group = criterion.benchmark_group("linter/default-rules");
+    benchmark_linter(group, &LinterSettings::default());
+}
+
+fn benchmark_all_rules(criterion: &mut Criterion) {
+    let mut rules: RuleTable = RuleSelector::All.all_rules().collect();
+
+    // Disable IO based rules because it is a source of flakiness
+    rules.disable(Rule::ShebangMissingExecutableFile);
+    rules.disable(Rule::ShebangNotExecutable);
+
+    let settings = LinterSettings {
+        rules,
+        ..LinterSettings::default()
+    };
+
+    let group = criterion.benchmark_group("linter/all-rules");
+    benchmark_linter(group, &settings);
+}
+
+criterion_group!(default_rules, benchmark_default_rules);
+criterion_group!(all_rules, benchmark_all_rules);
+criterion_main!(default_rules, all_rules);

crates/ruff_benchmark/benches/parser.rs

@@ -0,0 +1,77 @@
+use ruff_benchmark::criterion::{
+    criterion_group, criterion_main, measurement::WallTime, BenchmarkId, Criterion, Throughput,
+};
+use ruff_benchmark::{TestCase, TestFile, TestFileDownloadError};
+use ruff_python_ast::statement_visitor::{walk_stmt, StatementVisitor};
+use ruff_python_ast::Stmt;
+use ruff_python_parser::parse_suite;
+
+#[cfg(target_os = "windows")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
+#[cfg(all(
+    not(target_os = "windows"),
+    not(target_os = "openbsd"),
+    any(
+        target_arch = "x86_64",
+        target_arch = "aarch64",
+        target_arch = "powerpc64"
+    )
+))]
+#[global_allocator]
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
+fn create_test_cases() -> Result<Vec<TestCase>, TestFileDownloadError> {
+    Ok(vec![
+        TestCase::fast(TestFile::try_download("numpy/globals.py", "https://raw.githubusercontent.com/numpy/numpy/89d64415e349ca75a25250f22b874aa16e5c0973/numpy/_globals.py")?),
+        TestCase::fast(TestFile::try_download("unicode/pypinyin.py", "https://raw.githubusercontent.com/mozillazg/python-pinyin/9521e47d96e3583a5477f5e43a2e82d513f27a3f/pypinyin/standard.py")?),
+        TestCase::normal(TestFile::try_download(
+            "pydantic/types.py",
+            "https://raw.githubusercontent.com/pydantic/pydantic/83b3c49e99ceb4599d9286a3d793cea44ac36d4b/pydantic/types.py",
+        )?),
+        TestCase::normal(TestFile::try_download("numpy/ctypeslib.py", "https://raw.githubusercontent.com/numpy/numpy/e42c9503a14d66adfd41356ef5640c6975c45218/numpy/ctypeslib.py")?),
+        TestCase::slow(TestFile::try_download(
+            "large/dataset.py",
+            "https://raw.githubusercontent.com/DHI/mikeio/b7d26418f4db2909b0aa965253dbe83194d7bb5b/tests/test_dataset.py",
+        )?),
+    ])
+}
+
+struct CountVisitor {
+    count: usize,
+}
+
+impl<'a> StatementVisitor<'a> for CountVisitor {
+    fn visit_stmt(&mut self, stmt: &'a Stmt) {
+        walk_stmt(self, stmt);
+        self.count += 1;
+    }
+}
+
+fn benchmark_parser(criterion: &mut Criterion<WallTime>) {
+    let test_cases = create_test_cases().unwrap();
+    let mut group = criterion.benchmark_group("parser");
+
+    for case in test_cases {
+        group.throughput(Throughput::Bytes(case.code().len() as u64));
+        group.bench_with_input(
+            BenchmarkId::from_parameter(case.name()),
+            &case,
+            |b, case| {
+                b.iter(|| {
+                    let parsed = parse_suite(case.code(), case.name()).unwrap();
+
+                    let mut visitor = CountVisitor { count: 0 };
+                    visitor.visit_body(&parsed);
+                    visitor.count
+                });
+            },
+        );
+    }
+
+    group.finish();
+}
+
+criterion_group!(parser, benchmark_parser);
+criterion_main!(parser);

crates/ruff_benchmark/src/criterion.rs

@@ -0,0 +1,11 @@
+//! This module re-exports the criterion API but picks the right backend depending on whether
+//! the benchmarks are built to run locally or with codspeed
+
+#[cfg(not(codspeed))]
+pub use criterion::*;
+
+#[cfg(not(codspeed))]
+pub type BenchmarkGroup<'a> = criterion::BenchmarkGroup<'a, measurement::WallTime>;
+
+#[cfg(codspeed)]
+pub use codspeed_criterion_compat::*;

crates/ruff_benchmark/src/lib.rs

@@ -0,0 +1,170 @@
+pub mod criterion;
+
+use std::fmt::{Display, Formatter};
+use std::path::PathBuf;
+use std::process::Command;
+
+use url::Url;
+
+/// Relative size of a test case. Benchmarks can use it to configure the time for how long a benchmark should run to get stable results.
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
+pub enum TestCaseSpeed {
+    /// A test case that is fast to run
+    Fast,
+
+    /// A normal test case
+    Normal,
+
+    /// A slow test case
+    Slow,
+}
+
+#[derive(Debug, Clone)]
+pub struct TestCase {
+    file: TestFile,
+    speed: TestCaseSpeed,
+}
+
+impl TestCase {
+    pub fn fast(file: TestFile) -> Self {
+        Self {
+            file,
+            speed: TestCaseSpeed::Fast,
+        }
+    }
+
+    pub fn normal(file: TestFile) -> Self {
+        Self {
+            file,
+            speed: TestCaseSpeed::Normal,
+        }
+    }
+
+    pub fn slow(file: TestFile) -> Self {
+        Self {
+            file,
+            speed: TestCaseSpeed::Slow,
+        }
+    }
+}
+
+impl TestCase {
+    pub fn code(&self) -> &str {
+        &self.file.code
+    }
+
+    pub fn name(&self) -> &str {
+        &self.file.name
+    }
+
+    pub fn speed(&self) -> TestCaseSpeed {
+        self.speed
+    }
+
+    pub fn path(&self) -> PathBuf {
+        TARGET_DIR.join(self.name())
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct TestFile {
+    name: String,
+    code: String,
+}
+
+static TARGET_DIR: once_cell::sync::Lazy<PathBuf> = once_cell::sync::Lazy::new(|| {
+    cargo_target_directory().unwrap_or_else(|| PathBuf::from("target"))
+});
+
+fn cargo_target_directory() -> Option<PathBuf> {
+    #[derive(serde::Deserialize)]
+    struct Metadata {
+        target_directory: PathBuf,
+    }
+
+    std::env::var_os("CARGO_TARGET_DIR")
+        .map(PathBuf::from)
+        .or_else(|| {
+            let output = Command::new(std::env::var_os("CARGO")?)
+                .args(["metadata", "--format-version", "1"])
+                .output()
+                .ok()?;
+            let metadata: Metadata = serde_json::from_slice(&output.stdout).ok()?;
+            Some(metadata.target_directory)
+        })
+}
+
+impl TestFile {
+    pub fn new(name: String, code: String) -> Self {
+        Self { name, code }
+    }
+
+    #[allow(clippy::print_stderr)]
+    pub fn try_download(name: &str, url: &str) -> Result<TestFile, TestFileDownloadError> {
+        let url = Url::parse(url)?;
+
+        let cached_filename = TARGET_DIR.join(name);
+
+        if let Ok(content) = std::fs::read_to_string(&cached_filename) {
+            Ok(TestFile::new(name.to_string(), content))
+        } else {
+            // File not yet cached, download and cache it in the target directory
+            let response = ureq::get(url.as_str()).call()?;
+
+            let content = response.into_string()?;
+
+            // SAFETY: There's always the `target` directory
+            let parent = cached_filename.parent().unwrap();
+            if let Err(error) = std::fs::create_dir_all(parent) {
+                eprintln!("Failed to crate the directory for the test case {name}: {error}");
+            } else if let Err(error) = std::fs::write(cached_filename, &content) {
+                eprintln!("Failed to cache test case file downloaded from {url}: {error}");
+            }
+
+            Ok(TestFile::new(name.to_string(), content))
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum TestFileDownloadError {
+    UrlParse(url::ParseError),
+    Request(Box<ureq::Error>),
+    Download(std::io::Error),
+}
+
+impl From<url::ParseError> for TestFileDownloadError {
+    fn from(value: url::ParseError) -> Self {
+        Self::UrlParse(value)
+    }
+}
+
+impl From<ureq::Error> for TestFileDownloadError {
+    fn from(value: ureq::Error) -> Self {
+        Self::Request(Box::new(value))
+    }
+}
+
+impl From<std::io::Error> for TestFileDownloadError {
+    fn from(value: std::io::Error) -> Self {
+        Self::Download(value)
+    }
+}
+
+impl Display for TestFileDownloadError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            TestFileDownloadError::UrlParse(inner) => {
+                write!(f, "Failed to parse url: {inner}")
+            }
+            TestFileDownloadError::Request(inner) => {
+                write!(f, "Failed to download file: {inner}")
+            }
+            TestFileDownloadError::Download(inner) => {
+                write!(f, "Failed to download file: {inner}")
+            }
+        }
+    }
+}
+
+impl std::error::Error for TestFileDownloadError {}

crates/ruff_cache/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "ruff_cache"
+version = "0.0.0"
+publish = false
+authors = { workspace = true }
+edition = { workspace = true }
+rust-version = { workspace = true }
+homepage = { workspace = true }
+documentation = { workspace = true }
+repository = { workspace = true }
+license = { workspace = true }
+
+[dependencies]
+itertools = { workspace = true }
+glob = { workspace = true }
+globset = { workspace = true }
+regex = { workspace = true }
+filetime = { workspace = true }
+seahash = "4.1.0"
+
+[dev-dependencies]
+ruff_macros = { path = "../ruff_macros" }

crates/ruff_cache/src/cache_key.rs

@@ -0,0 +1,468 @@
+use std::borrow::Cow;
+use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
+use std::hash::{Hash, Hasher};
+use std::num::{
+    NonZeroI128, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI8, NonZeroU128, NonZeroU16,
+    NonZeroU32, NonZeroU64, NonZeroU8,
+};
+use std::path::{Path, PathBuf};
+
+use glob::Pattern;
+use itertools::Itertools;
+use regex::Regex;
+use seahash::SeaHasher;
+
+/// A type that be used as part of a cache key.
+///
+/// A cache looks up artefacts by a cache key. Many cache keys are composed of sub-keys. For example,
+/// caching the lint results of a file depend at least on the file content, the user settings, and linter version.
+/// Types implementing the [`CacheKey`] trait can be used as part of a cache key by which artefacts are queried.
+///
+/// ## Implementing `CacheKey`
+///
+/// You can derive [`CacheKey`] with `#[derive(CacheKey)]` if all fields implement [`CacheKey`]. The resulting
+/// cache key will be the combination of the values from calling `cache_key` on each field.
+///
+/// ```
+/// # use ruff_macros::CacheKey;
+///
+/// #[derive(CacheKey)]
+/// struct Test {
+///     name: String,
+///     version: u32,
+/// }
+/// ```
+///
+/// If you need more control over computing the cache key, you can of course implement the [`CacheKey]` yourself:
+///
+/// ```
+///  use ruff_cache::{CacheKey, CacheKeyHasher};
+///
+/// struct Test {
+///     name: String,
+///     version: u32,
+///     other: String
+/// }
+///
+/// impl CacheKey for Test {
+///     fn cache_key(&self, state: &mut CacheKeyHasher) {
+///         self.name.cache_key(state);
+///         self.version.cache_key(state);
+///     }
+/// }
+/// ```
+///
+/// ## Portability
+///
+/// Ideally, the cache key is portable across platforms but this is not yet a strict requirement.
+///
+/// ## Using [`Hash`]
+///
+/// You can defer to the [`Hash`] implementation for non-composite types.
+/// Be aware, that the [`Hash`] implementation may not be portable.
+///
+/// ## Why a new trait rather than reusing [`Hash`]?
+/// The main reason is that hashes and cache keys have different constraints:
+///
+/// * Cache keys are less performance sensitive: Hashes must be super fast to compute for performant hashed-collections. That's
+///   why some standard types don't implement [`Hash`] where it would be safe to to implement [`CacheKey`], e.g. `HashSet`
+/// * Cache keys must be deterministic where hash keys do not have this constraint. That's why pointers don't implement [`CacheKey`] but they implement [`Hash`].
+/// * Ideally, cache keys are portable
+///
+/// [`Hash`](Hash)
+pub trait CacheKey {
+    fn cache_key(&self, state: &mut CacheKeyHasher);
+
+    fn cache_key_slice(data: &[Self], state: &mut CacheKeyHasher)
+    where
+        Self: Sized,
+    {
+        for piece in data {
+            piece.cache_key(state);
+        }
+    }
+}
+
+impl CacheKey for bool {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u8(u8::from(*self));
+    }
+}
+
+impl CacheKey for char {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u32(*self as u32);
+    }
+}
+
+impl CacheKey for usize {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(*self);
+    }
+}
+
+impl CacheKey for u128 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u128(*self);
+    }
+}
+
+impl CacheKey for u64 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u64(*self);
+    }
+}
+
+impl CacheKey for u32 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u32(*self);
+    }
+}
+
+impl CacheKey for u16 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u16(*self);
+    }
+}
+
+impl CacheKey for u8 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_u8(*self);
+    }
+}
+
+impl CacheKey for isize {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_isize(*self);
+    }
+}
+
+impl CacheKey for i128 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_i128(*self);
+    }
+}
+
+impl CacheKey for i64 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_i64(*self);
+    }
+}
+
+impl CacheKey for i32 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_i32(*self);
+    }
+}
+
+impl CacheKey for i16 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_i16(*self);
+    }
+}
+
+impl CacheKey for i8 {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_i8(*self);
+    }
+}
+macro_rules! impl_cache_key_non_zero {
+    ($name:ident) => {
+        impl CacheKey for $name {
+            #[inline]
+            fn cache_key(&self, state: &mut CacheKeyHasher) {
+                self.get().cache_key(state)
+            }
+        }
+    };
+}
+
+impl_cache_key_non_zero!(NonZeroU8);
+impl_cache_key_non_zero!(NonZeroU16);
+impl_cache_key_non_zero!(NonZeroU32);
+impl_cache_key_non_zero!(NonZeroU64);
+impl_cache_key_non_zero!(NonZeroU128);
+
+impl_cache_key_non_zero!(NonZeroI8);
+impl_cache_key_non_zero!(NonZeroI16);
+impl_cache_key_non_zero!(NonZeroI32);
+impl_cache_key_non_zero!(NonZeroI64);
+impl_cache_key_non_zero!(NonZeroI128);
+
+macro_rules! impl_cache_key_tuple {
+    () => (
+        impl CacheKey for () {
+            #[inline]
+            fn cache_key(&self, _state: &mut CacheKeyHasher) {}
+        }
+    );
+
+    ( $($name:ident)+) => (
+        impl<$($name: CacheKey),+> CacheKey for ($($name,)+) where last_type!($($name,)+): ?Sized {
+            #[allow(non_snake_case)]
+            #[inline]
+            fn cache_key(&self, state: &mut CacheKeyHasher) {
+                let ($(ref $name,)+) = *self;
+                $($name.cache_key(state);)+
+            }
+        }
+    );
+}
+
+macro_rules! last_type {
+    ($a:ident,) => { $a };
+    ($a:ident, $($rest_a:ident,)+) => { last_type!($($rest_a,)+) };
+}
+
+impl_cache_key_tuple! {}
+impl_cache_key_tuple! { T }
+impl_cache_key_tuple! { T B }
+impl_cache_key_tuple! { T B C }
+impl_cache_key_tuple! { T B C D }
+impl_cache_key_tuple! { T B C D E }
+impl_cache_key_tuple! { T B C D E F }
+impl_cache_key_tuple! { T B C D E F G }
+impl_cache_key_tuple! { T B C D E F G H }
+impl_cache_key_tuple! { T B C D E F G H I }
+impl_cache_key_tuple! { T B C D E F G H I J }
+impl_cache_key_tuple! { T B C D E F G H I J K }
+impl_cache_key_tuple! { T B C D E F G H I J K L }
+
+impl CacheKey for str {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.hash(&mut *state);
+    }
+}
+
+impl CacheKey for String {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.hash(&mut *state);
+    }
+}
+
+impl<T: CacheKey> CacheKey for Option<T> {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        match self {
+            None => state.write_usize(0),
+            Some(value) => {
+                state.write_usize(1);
+                value.cache_key(state);
+            }
+        }
+    }
+}
+
+impl<T: CacheKey> CacheKey for [T] {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(self.len());
+        CacheKey::cache_key_slice(self, state);
+    }
+}
+
+impl<T: ?Sized + CacheKey> CacheKey for &T {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        (**self).cache_key(state);
+    }
+}
+
+impl<T: ?Sized + CacheKey> CacheKey for &mut T {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        (**self).cache_key(state);
+    }
+}
+
+impl<T> CacheKey for Vec<T>
+where
+    T: CacheKey,
+{
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(self.len());
+        CacheKey::cache_key_slice(self, state);
+    }
+}
+
+impl<K, V, S> CacheKey for HashMap<K, V, S>
+where
+    K: CacheKey + Ord,
+    V: CacheKey,
+{
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(self.len());
+        for (key, value) in self
+            .iter()
+            .sorted_by(|(left, _), (right, _)| left.cmp(right))
+        {
+            key.cache_key(state);
+            value.cache_key(state);
+        }
+    }
+}
+
+impl<V: CacheKey + Ord, S> CacheKey for HashSet<V, S> {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(self.len());
+        for value in self.iter().sorted() {
+            value.cache_key(state);
+        }
+    }
+}
+
+impl<V: CacheKey> CacheKey for BTreeSet<V> {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(self.len());
+        for item in self {
+            item.cache_key(state);
+        }
+    }
+}
+
+impl<K: CacheKey + Ord, V: CacheKey> CacheKey for BTreeMap<K, V> {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        state.write_usize(self.len());
+
+        for (key, value) in self {
+            key.cache_key(state);
+            value.cache_key(state);
+        }
+    }
+}
+
+impl CacheKey for Path {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.hash(&mut *state);
+    }
+}
+
+impl CacheKey for PathBuf {
+    #[inline]
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.as_path().cache_key(state);
+    }
+}
+
+impl<V: ?Sized> CacheKey for Cow<'_, V>
+where
+    V: CacheKey + ToOwned,
+{
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        (**self).cache_key(state);
+    }
+}
+
+impl CacheKey for Regex {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.as_str().cache_key(state);
+    }
+}
+
+impl CacheKey for Pattern {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.as_str().cache_key(state);
+    }
+}
+
+#[derive(Clone, Default)]
+pub struct CacheKeyHasher {
+    inner: SeaHasher,
+}
+
+impl CacheKeyHasher {
+    pub fn new() -> Self {
+        Self {
+            inner: SeaHasher::new(),
+        }
+    }
+}
+
+impl Hasher for CacheKeyHasher {
+    #[inline]
+    fn finish(&self) -> u64 {
+        self.inner.finish()
+    }
+
+    #[inline]
+    fn write(&mut self, bytes: &[u8]) {
+        self.inner.write(bytes);
+    }
+
+    #[inline]
+    fn write_u8(&mut self, i: u8) {
+        self.inner.write_u8(i);
+    }
+
+    #[inline]
+    fn write_u16(&mut self, i: u16) {
+        self.inner.write_u16(i);
+    }
+
+    #[inline]
+    fn write_u32(&mut self, i: u32) {
+        self.inner.write_u32(i);
+    }
+
+    #[inline]
+    fn write_u64(&mut self, i: u64) {
+        self.inner.write_u64(i);
+    }
+
+    #[inline]
+    fn write_u128(&mut self, i: u128) {
+        self.inner.write_u128(i);
+    }
+
+    #[inline]
+    fn write_usize(&mut self, i: usize) {
+        self.inner.write_usize(i);
+    }
+
+    #[inline]
+    fn write_i8(&mut self, i: i8) {
+        self.inner.write_i8(i);
+    }
+
+    #[inline]
+    fn write_i16(&mut self, i: i16) {
+        self.inner.write_i16(i);
+    }
+
+    #[inline]
+    fn write_i32(&mut self, i: i32) {
+        self.inner.write_i32(i);
+    }
+
+    #[inline]
+    fn write_i64(&mut self, i: i64) {
+        self.inner.write_i64(i);
+    }
+
+    #[inline]
+    fn write_i128(&mut self, i: i128) {
+        self.inner.write_i128(i);
+    }
+
+    #[inline]
+    fn write_isize(&mut self, i: isize) {
+        self.inner.write_isize(i);
+    }
+}

crates/ruff_cache/src/filetime.rs

@@ -0,0 +1,11 @@
+use std::hash::Hash;
+
+use filetime::FileTime;
+
+use crate::{CacheKey, CacheKeyHasher};
+
+impl CacheKey for FileTime {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.hash(&mut *state);
+    }
+}

crates/ruff_cache/src/globset.rs

@@ -0,0 +1,15 @@
+use globset::{Glob, GlobMatcher};
+
+use crate::{CacheKey, CacheKeyHasher};
+
+impl CacheKey for GlobMatcher {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.glob().cache_key(state);
+    }
+}
+
+impl CacheKey for Glob {
+    fn cache_key(&self, state: &mut CacheKeyHasher) {
+        self.glob().cache_key(state);
+    }
+}

crates/ruff_cache/src/lib.rs

@@ -0,0 +1,14 @@
+use std::path::{Path, PathBuf};
+
+pub use cache_key::{CacheKey, CacheKeyHasher};
+
+mod cache_key;
+pub mod filetime;
+pub mod globset;
+
+pub const CACHE_DIR_NAME: &str = ".ruff_cache";
+
+/// Return the cache directory for a given project root.
+pub fn cache_dir(project_root: &Path) -> PathBuf {
+    project_root.join(CACHE_DIR_NAME)
+}

crates/ruff_cache/tests/cache_key.rs

@@ -0,0 +1,139 @@
+use std::hash::{Hash, Hasher};
+
+use ruff_cache::{CacheKey, CacheKeyHasher};
+use ruff_macros::CacheKey;
+
+#[test]
+fn unit_struct_cache_key() {
+    #[derive(CacheKey, Hash)]
+    struct UnitStruct;
+
+    let mut key = CacheKeyHasher::new();
+
+    UnitStruct.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    UnitStruct.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}
+
+#[test]
+fn named_field_struct() {
+    #[derive(CacheKey, Hash)]
+    struct NamedFieldsStruct {
+        a: String,
+        b: String,
+    }
+
+    let mut key = CacheKeyHasher::new();
+
+    let named_fields = NamedFieldsStruct {
+        a: "Hello".into(),
+        b: "World".into(),
+    };
+
+    named_fields.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    named_fields.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}
+
+#[test]
+fn struct_ignored_fields() {
+    #[derive(CacheKey)]
+    struct NamedFieldsStruct {
+        a: String,
+        #[cache_key(ignore)]
+        #[allow(unused)]
+        b: String,
+    }
+
+    impl Hash for NamedFieldsStruct {
+        fn hash<H: Hasher>(&self, state: &mut H) {
+            self.a.hash(state);
+        }
+    }
+
+    let mut key = CacheKeyHasher::new();
+
+    let named_fields = NamedFieldsStruct {
+        a: "Hello".into(),
+        b: "World".into(),
+    };
+
+    named_fields.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    named_fields.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}
+
+#[test]
+fn unnamed_field_struct() {
+    #[derive(CacheKey, Hash)]
+    struct UnnamedFieldsStruct(String, String);
+
+    let mut key = CacheKeyHasher::new();
+
+    let unnamed_fields = UnnamedFieldsStruct("Hello".into(), "World".into());
+
+    unnamed_fields.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    unnamed_fields.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}
+
+#[derive(CacheKey, Hash)]
+enum Enum {
+    Unit,
+    UnnamedFields(String, String),
+    NamedFields { a: String, b: String },
+}
+
+#[test]
+fn enum_unit_variant() {
+    let mut key = CacheKeyHasher::new();
+
+    let variant = Enum::Unit;
+    variant.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    variant.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}
+
+#[test]
+fn enum_named_fields_variant() {
+    let mut key = CacheKeyHasher::new();
+
+    let variant = Enum::NamedFields {
+        a: "Hello".to_string(),
+        b: "World".to_string(),
+    };
+    variant.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    variant.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}
+
+#[test]
+fn enum_unnamed_fields_variant() {
+    let mut key = CacheKeyHasher::new();
+
+    let variant = Enum::UnnamedFields("Hello".to_string(), "World".to_string());
+    variant.cache_key(&mut key);
+
+    let mut hash = CacheKeyHasher::new();
+    variant.hash(&mut hash);
+
+    assert_eq!(hash.finish(), key.finish());
+}

crates/ruff_cli/Cargo.toml

@@ -0,0 +1,78 @@
+[package]
+name = "ruff_cli"
+version = "0.1.5"
+publish = false
+authors = { workspace = true }
+edition = { workspace = true }
+rust-version = { workspace = true }
+homepage = { workspace = true }
+documentation = { workspace = true }
+repository = { workspace = true }
+license = { workspace = true }
+readme = "../../README.md"
+
+[[bin]]
+name = "ruff"
+
+[dependencies]
+ruff_linter = { path = "../ruff_linter", features = ["clap"] }
+ruff_cache = { path = "../ruff_cache" }
+ruff_diagnostics = { path = "../ruff_diagnostics" }
+ruff_formatter = { path = "../ruff_formatter" }
+ruff_notebook = { path = "../ruff_notebook" }
+ruff_macros = { path = "../ruff_macros" }
+ruff_python_ast = { path = "../ruff_python_ast" }
+ruff_python_formatter = { path = "../ruff_python_formatter" }
+ruff_source_file = { path = "../ruff_source_file" }
+ruff_python_trivia = { path = "../ruff_python_trivia" }
+ruff_workspace = { path = "../ruff_workspace" }
+ruff_text_size = { path = "../ruff_text_size" }
+
+annotate-snippets = { version = "0.9.1", features = ["color"] }
+anyhow = { workspace = true }
+argfile = { version = "0.1.6" }
+bincode = { version = "1.3.3" }
+bitflags = { workspace = true }
+cachedir = { version = "0.3.0" }
+chrono = { workspace = true }
+clap = { workspace = true, features = ["derive", "env"] }
+clap_complete_command = { version = "0.5.1" }
+clearscreen = { version = "2.0.0" }
+colored = { workspace = true }
+filetime = { workspace = true }
+glob = { workspace = true }
+ignore = { workspace = true }
+is-macro = { workspace = true }
+itertools = { workspace = true }
+log = { workspace = true }
+notify = { version = "6.1.1" }
+path-absolutize = { workspace = true, features = ["once_cell_cache"] }
+rayon = { version = "1.8.0" }
+regex = { workspace = true }
+ruff_python_stdlib = { path = "../ruff_python_stdlib" }
+rustc-hash = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+shellexpand = { workspace = true }
+similar = { workspace = true }
+strum = { workspace = true, features = [] }
+thiserror = { workspace = true }
+tracing = { workspace = true, features = ["log"] }
+walkdir = { version = "2.3.2" }
+wild = { version = "2" }
+
+[dev-dependencies]
+assert_cmd = { version = "2.0.8" }
+# Avoid writing colored snapshots when running tests from the terminal
+colored = { workspace = true, features = ["no-color"]}
+insta = { workspace = true, features = ["filters", "json"] }
+insta-cmd = { version = "0.4.0" }
+tempfile = "3.8.1"
+test-case = { workspace = true }
+ureq = { version = "2.8.0", features = [] }
+
+[target.'cfg(target_os = "windows")'.dependencies]
+mimalloc = "0.1.39"
+
+[target.'cfg(all(not(target_os = "windows"), not(target_os = "openbsd"), any(target_arch = "x86_64", target_arch = "aarch64", target_arch = "powerpc64")))'.dependencies]
+tikv-jemallocator = "0.5.0"

crates/ruff_cli/build.rs

@@ -0,0 +1,80 @@
+use std::{fs, path::Path, process::Command};
+
+fn main() {
+    // The workspace root directory is not available without walking up the tree
+    // https://github.com/rust-lang/cargo/issues/3946
+    let workspace_root = Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap())
+        .join("..")
+        .join("..");
+
+    commit_info(&workspace_root);
+
+    #[allow(clippy::disallowed_methods)]
+    let target = std::env::var("TARGET").unwrap();
+    println!("cargo:rustc-env=RUST_HOST_TARGET={target}");
+}
+
+fn commit_info(workspace_root: &Path) {
+    // If not in a git repository, do not attempt to retrieve commit information
+    let git_dir = workspace_root.join(".git");
+    if !git_dir.exists() {
+        return;
+    }
+
+    let git_head_path = git_dir.join("HEAD");
+    println!(
+        "cargo:rerun-if-changed={}",
+        git_head_path.as_path().display()
+    );
+
+    let git_head_contents = fs::read_to_string(git_head_path);
+    if let Ok(git_head_contents) = git_head_contents {
+        // The contents are either a commit or a reference in the following formats
+        // - "<commit>" when the head is detached
+        // - "ref <ref>" when working on a branch
+        // If a commit, checking if the HEAD file has changed is sufficient
+        // If a ref, we need to add the head file for that ref to rebuild on commit
+        let mut git_ref_parts = git_head_contents.split_whitespace();
+        git_ref_parts.next();
+        if let Some(git_ref) = git_ref_parts.next() {
+            let git_ref_path = git_dir.join(git_ref);
+            println!(
+                "cargo:rerun-if-changed={}",
+                git_ref_path.as_path().display()
+            );
+        }
+    }
+
+    let output = match Command::new("git")
+        .arg("log")
+        .arg("-1")
+        .arg("--date=short")
+        .arg("--abbrev=9")
+        .arg("--format=%H %h %cd %(describe)")
+        .output()
+    {
+        Ok(output) if output.status.success() => output,
+        _ => return,
+    };
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let mut parts = stdout.split_whitespace();
+    let mut next = || parts.next().unwrap();
+    println!("cargo:rustc-env=RUFF_COMMIT_HASH={}", next());
+    println!("cargo:rustc-env=RUFF_COMMIT_SHORT_HASH={}", next());
+    println!("cargo:rustc-env=RUFF_COMMIT_DATE={}", next());
+
+    // Describe can fail for some commits
+    // https://git-scm.com/docs/pretty-formats#Documentation/pretty-formats.txt-emdescribeoptionsem
+    if let Some(describe) = parts.next() {
+        let mut describe_parts = describe.split('-');
+        println!(
+            "cargo:rustc-env=RUFF_LAST_TAG={}",
+            describe_parts.next().unwrap()
+        );
+        // If this is the tagged commit, this component will be missing
+        println!(
+            "cargo:rustc-env=RUFF_LAST_TAG_DISTANCE={}",
+            describe_parts.next().unwrap_or("0")
+        );
+    }
+}

crates/ruff_cli/resources/test/fixtures/cache_mutable/.gitignore

@@ -0,0 +1,2 @@
+# Modified by the cache tests.
+source.py

crates/ruff_cli/resources/test/fixtures/cache_remove_old_files/source.py

@@ -0,0 +1,4 @@
+# NOTE: sync with cache::invalidation test
+a = 1
+
+__all__ = list(["a", "b"])

crates/ruff_cli/resources/test/fixtures/formatted.py

@@ -0,0 +1 @@
+print("All formatted!")

crates/ruff_cli/resources/test/fixtures/unformatted.ipynb

@@ -0,0 +1,72 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "98e1dd71-14a2-454d-9be0-061dde560b07",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy\n",
+    "maths = (numpy.arange(100)**2).sum()\n",
+    "stats= numpy.asarray([1,2,3,4]).median()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "83a0b1b8",
+   "metadata": {},
+   "source": [
+    "A markdown cell"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ae12f012",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# A cell with IPython escape command\n",
+    "def some_function(foo, bar):\n",
+    "    pass\n",
+    "%matplotlib inline"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "10f3bbf9",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "foo = %pwd\n",
+    "def some_function(foo,bar,):\n",
+    "    # Another cell with IPython escape command\n",
+    "    foo = %pwd\n",
+    "    print(foo)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.12"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

crates/ruff_cli/resources/test/fixtures/unformatted.py

@@ -0,0 +1,3 @@
+x = 1
+y=2
+z = 3

crates/ruff_cli/src/args.rs

@@ -0,0 +1,760 @@
+use std::path::PathBuf;
+
+use clap::{command, Parser};
+use regex::Regex;
+use rustc_hash::FxHashMap;
+
+use ruff_linter::line_width::LineLength;
+use ruff_linter::logging::LogLevel;
+use ruff_linter::registry::Rule;
+use ruff_linter::settings::types::{
+    ExtensionPair, FilePattern, PatternPrefixPair, PerFileIgnore, PreviewMode, PythonVersion,
+    SerializationFormat, UnsafeFixes,
+};
+use ruff_linter::{RuleParser, RuleSelector, RuleSelectorParser};
+use ruff_workspace::configuration::{Configuration, RuleSelection};
+use ruff_workspace::options::PycodestyleOptions;
+use ruff_workspace::resolver::ConfigurationTransformer;
+
+#[derive(Debug, Parser)]
+#[command(
+    author,
+    name = "ruff",
+    about = "Ruff: An extremely fast Python linter.",
+    after_help = "For help with a specific command, see: `ruff help <command>`."
+)]
+#[command(version)]
+pub struct Args {
+    #[command(subcommand)]
+    pub command: Command,
+    #[clap(flatten)]
+    pub log_level_args: LogLevelArgs,
+}
+
+#[allow(clippy::large_enum_variant)]
+#[derive(Debug, clap::Subcommand)]
+pub enum Command {
+    /// Run Ruff on the given files or directories (default).
+    Check(CheckCommand),
+    /// Explain a rule (or all rules).
+    #[clap(alias = "--explain")]
+    #[command(group = clap::ArgGroup::new("selector").multiple(false).required(true))]
+    Rule {
+        /// Rule to explain
+        #[arg(value_parser=RuleParser, group = "selector", hide_possible_values = true)]
+        rule: Option<Rule>,
+
+        /// Explain all rules
+        #[arg(long, conflicts_with = "rule", group = "selector")]
+        all: bool,
+
+        /// Output format
+        #[arg(long, value_enum, default_value = "text")]
+        output_format: HelpFormat,
+
+        /// Output format (Deprecated: Use `--output-format` instead).
+        #[arg(long, value_enum, conflicts_with = "output_format", hide = true)]
+        format: Option<HelpFormat>,
+    },
+    /// List or describe the available configuration options.
+    Config { option: Option<String> },
+    /// List all supported upstream linters.
+    Linter {
+        /// Output format
+        #[arg(long, value_enum, default_value = "text")]
+        output_format: HelpFormat,
+
+        /// Output format (Deprecated: Use `--output-format` instead).
+        #[arg(long, value_enum, conflicts_with = "output_format", hide = true)]
+        format: Option<HelpFormat>,
+    },
+    /// Clear any caches in the current directory and any subdirectories.
+    #[clap(alias = "--clean")]
+    Clean,
+    /// Generate shell completion.
+    #[clap(alias = "--generate-shell-completion", hide = true)]
+    GenerateShellCompletion { shell: clap_complete_command::Shell },
+    /// Run the Ruff formatter on the given files or directories.
+    Format(FormatCommand),
+    /// Display Ruff's version
+    Version {
+        #[arg(long, value_enum, default_value = "text")]
+        output_format: HelpFormat,
+    },
+}
+
+// The `Parser` derive is for ruff_dev, for ruff_cli `Args` would be sufficient
+#[derive(Clone, Debug, clap::Parser)]
+#[allow(clippy::struct_excessive_bools)]
+pub struct CheckCommand {
+    /// List of files or directories to check.
+    pub files: Vec<PathBuf>,
+    /// Apply fixes to resolve lint violations.
+    /// Use `--no-fix` to disable or `--unsafe-fixes` to include unsafe fixes.
+    #[arg(long, overrides_with("no_fix"))]
+    fix: bool,
+    #[clap(long, overrides_with("fix"), hide = true)]
+    no_fix: bool,
+    /// Include fixes that may not retain the original intent of the code.
+    /// Use `--no-unsafe-fixes` to disable.
+    #[arg(long, overrides_with("no_unsafe_fixes"))]
+    unsafe_fixes: bool,
+    #[arg(long, overrides_with("unsafe_fixes"), hide = true)]
+    no_unsafe_fixes: bool,
+    /// Show violations with source code.
+    /// Use `--no-show-source` to disable.
+    #[arg(long, overrides_with("no_show_source"))]
+    show_source: bool,
+    #[clap(long, overrides_with("show_source"), hide = true)]
+    no_show_source: bool,
+    /// Show an enumeration of all fixed lint violations.
+    /// Use `--no-show-fixes` to disable.
+    #[arg(long, overrides_with("no_show_fixes"))]
+    show_fixes: bool,
+    #[clap(long, overrides_with("show_fixes"), hide = true)]
+    no_show_fixes: bool,
+    /// Avoid writing any fixed files back; instead, output a diff for each changed file to stdout. Implies `--fix-only`.
+    #[arg(long, conflicts_with = "show_fixes")]
+    pub diff: bool,
+    /// Run in watch mode by re-running whenever files change.
+    #[arg(short, long)]
+    pub watch: bool,
+    /// Apply fixes to resolve lint violations, but don't report on leftover violations. Implies `--fix`.
+    /// Use `--no-fix-only` to disable or `--unsafe-fixes` to include unsafe fixes.
+    #[arg(long, overrides_with("no_fix_only"))]
+    fix_only: bool,
+    #[clap(long, overrides_with("fix_only"), hide = true)]
+    no_fix_only: bool,
+    /// Ignore any `# noqa` comments.
+    #[arg(long)]
+    ignore_noqa: bool,
+
+    /// Output serialization format for violations.
+    #[arg(long, value_enum, env = "RUFF_OUTPUT_FORMAT")]
+    pub output_format: Option<SerializationFormat>,
+
+    /// Specify file to write the linter output to (default: stdout).
+    #[arg(short, long)]
+    pub output_file: Option<PathBuf>,
+    /// The minimum Python version that should be supported.
+    #[arg(long, value_enum)]
+    pub target_version: Option<PythonVersion>,
+    /// Enable preview mode; checks will include unstable rules and fixes.
+    /// Use `--no-preview` to disable.
+    #[arg(long, overrides_with("no_preview"))]
+    preview: bool,
+    #[clap(long, overrides_with("preview"), hide = true)]
+    no_preview: bool,
+    /// Path to the `pyproject.toml` or `ruff.toml` file to use for
+    /// configuration.
+    #[arg(long, conflicts_with = "isolated")]
+    pub config: Option<PathBuf>,
+    /// Comma-separated list of rule codes to enable (or ALL, to enable all rules).
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide_possible_values = true
+    )]
+    pub select: Option<Vec<RuleSelector>>,
+    /// Comma-separated list of rule codes to disable.
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide_possible_values = true
+    )]
+    pub ignore: Option<Vec<RuleSelector>>,
+    /// Like --select, but adds additional rule codes on top of those already specified.
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide_possible_values = true
+    )]
+    pub extend_select: Option<Vec<RuleSelector>>,
+    /// Like --ignore. (Deprecated: You can just use --ignore instead.)
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide = true
+    )]
+    pub extend_ignore: Option<Vec<RuleSelector>>,
+    /// List of mappings from file pattern to code to exclude.
+    #[arg(long, value_delimiter = ',', help_heading = "Rule selection")]
+    pub per_file_ignores: Option<Vec<PatternPrefixPair>>,
+    /// Like `--per-file-ignores`, but adds additional ignores on top of those already specified.
+    #[arg(long, value_delimiter = ',', help_heading = "Rule selection")]
+    pub extend_per_file_ignores: Option<Vec<PatternPrefixPair>>,
+    /// List of paths, used to omit files and/or directories from analysis.
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "FILE_PATTERN",
+        help_heading = "File selection"
+    )]
+    pub exclude: Option<Vec<FilePattern>>,
+    /// Like --exclude, but adds additional files and directories on top of those already excluded.
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "FILE_PATTERN",
+        help_heading = "File selection"
+    )]
+    pub extend_exclude: Option<Vec<FilePattern>>,
+    /// List of rule codes to treat as eligible for fix. Only applicable when fix itself is enabled (e.g., via `--fix`).
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide_possible_values = true
+    )]
+    pub fixable: Option<Vec<RuleSelector>>,
+    /// List of rule codes to treat as ineligible for fix. Only applicable when fix itself is enabled (e.g., via `--fix`).
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide_possible_values = true
+    )]
+    pub unfixable: Option<Vec<RuleSelector>>,
+    /// Like --fixable, but adds additional rule codes on top of those already specified.
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide_possible_values = true
+    )]
+    pub extend_fixable: Option<Vec<RuleSelector>>,
+    /// Like --unfixable. (Deprecated: You can just use --unfixable instead.)
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "RULE_CODE",
+        value_parser = RuleSelectorParser,
+        help_heading = "Rule selection",
+        hide = true
+    )]
+    pub extend_unfixable: Option<Vec<RuleSelector>>,
+    /// Respect file exclusions via `.gitignore` and other standard ignore files.
+    /// Use `--no-respect-gitignore` to disable.
+    #[arg(
+        long,
+        overrides_with("no_respect_gitignore"),
+        help_heading = "File selection"
+    )]
+    respect_gitignore: bool,
+    #[clap(long, overrides_with("respect_gitignore"), hide = true)]
+    no_respect_gitignore: bool,
+    /// Enforce exclusions, even for paths passed to Ruff directly on the command-line.
+    /// Use `--no-force-exclude` to disable.
+    #[arg(
+        long,
+        overrides_with("no_force_exclude"),
+        help_heading = "File selection"
+    )]
+    force_exclude: bool,
+    #[clap(long, overrides_with("force_exclude"), hide = true)]
+    no_force_exclude: bool,
+    /// Set the line-length for length-associated rules and automatic formatting.
+    #[arg(long, help_heading = "Rule configuration", hide = true)]
+    pub line_length: Option<LineLength>,
+    /// Regular expression matching the name of dummy variables.
+    #[arg(long, help_heading = "Rule configuration", hide = true)]
+    pub dummy_variable_rgx: Option<Regex>,
+    /// Disable cache reads.
+    #[arg(short, long, env = "RUFF_NO_CACHE", help_heading = "Miscellaneous")]
+    pub no_cache: bool,
+    /// Ignore all configuration files.
+    #[arg(long, conflicts_with = "config", help_heading = "Miscellaneous")]
+    pub isolated: bool,
+    /// Path to the cache directory.
+    #[arg(long, env = "RUFF_CACHE_DIR", help_heading = "Miscellaneous")]
+    pub cache_dir: Option<PathBuf>,
+    /// The name of the file when passing it through stdin.
+    #[arg(long, help_heading = "Miscellaneous")]
+    pub stdin_filename: Option<PathBuf>,
+    /// Exit with status code "0", even upon detecting lint violations.
+    #[arg(
+        short,
+        long,
+        help_heading = "Miscellaneous",
+        conflicts_with = "exit_non_zero_on_fix"
+    )]
+    pub exit_zero: bool,
+    /// Exit with a non-zero status code if any files were modified via fix, even if no lint violations remain.
+    #[arg(long, help_heading = "Miscellaneous", conflicts_with = "exit_zero")]
+    pub exit_non_zero_on_fix: bool,
+    /// Show counts for every rule with at least one violation.
+    #[arg(
+        long,
+        // Unsupported default-command arguments.
+        conflicts_with = "diff",
+        conflicts_with = "show_source",
+        conflicts_with = "watch",
+    )]
+    pub statistics: bool,
+    /// Enable automatic additions of `noqa` directives to failing lines.
+    #[arg(
+        long,
+        // conflicts_with = "add_noqa",
+        conflicts_with = "show_files",
+        conflicts_with = "show_settings",
+        // Unsupported default-command arguments.
+        conflicts_with = "ignore_noqa",
+        conflicts_with = "statistics",
+        conflicts_with = "stdin_filename",
+        conflicts_with = "watch",
+        conflicts_with = "fix",
+    )]
+    pub add_noqa: bool,
+    /// See the files Ruff will be run against with the current settings.
+    #[arg(
+        long,
+        // Fake subcommands.
+        conflicts_with = "add_noqa",
+        // conflicts_with = "show_files",
+        conflicts_with = "show_settings",
+        // Unsupported default-command arguments.
+        conflicts_with = "ignore_noqa",
+        conflicts_with = "statistics",
+        conflicts_with = "stdin_filename",
+        conflicts_with = "watch",
+    )]
+    pub show_files: bool,
+    /// See the settings Ruff will use to lint a given Python file.
+    #[arg(
+        long,
+        // Fake subcommands.
+        conflicts_with = "add_noqa",
+        conflicts_with = "show_files",
+        // conflicts_with = "show_settings",
+        // Unsupported default-command arguments.
+        conflicts_with = "ignore_noqa",
+        conflicts_with = "statistics",
+        conflicts_with = "stdin_filename",
+        conflicts_with = "watch",
+    )]
+    pub show_settings: bool,
+    /// List of mappings from file extension to language (one of ["python", "ipynb", "pyi"]).
+    #[arg(long, value_delimiter = ',', hide = true)]
+    pub extension: Option<Vec<ExtensionPair>>,
+    /// Dev-only argument to show fixes
+    #[arg(long, hide = true)]
+    pub ecosystem_ci: bool,
+}
+
+#[derive(Clone, Debug, clap::Parser)]
+#[allow(clippy::struct_excessive_bools)]
+pub struct FormatCommand {
+    /// List of files or directories to format.
+    pub files: Vec<PathBuf>,
+    /// Avoid writing any formatted files back; instead, exit with a non-zero status code if any
+    /// files would have been modified, and zero otherwise.
+    #[arg(long)]
+    pub check: bool,
+    /// Avoid writing any formatted files back; instead, exit with a non-zero status code and the
+    /// difference between the current file and how the formatted file would look like.
+    #[arg(long)]
+    pub diff: bool,
+    /// Path to the `pyproject.toml` or `ruff.toml` file to use for configuration.
+    #[arg(long, conflicts_with = "isolated")]
+    pub config: Option<PathBuf>,
+
+    /// Disable cache reads.
+    #[arg(short, long, env = "RUFF_NO_CACHE", help_heading = "Miscellaneous")]
+    pub no_cache: bool,
+    /// Path to the cache directory.
+    #[arg(long, env = "RUFF_CACHE_DIR", help_heading = "Miscellaneous")]
+    pub cache_dir: Option<PathBuf>,
+
+    /// Respect file exclusions via `.gitignore` and other standard ignore files.
+    /// Use `--no-respect-gitignore` to disable.
+    #[arg(
+        long,
+        overrides_with("no_respect_gitignore"),
+        help_heading = "File selection"
+    )]
+    respect_gitignore: bool,
+    #[clap(long, overrides_with("respect_gitignore"), hide = true)]
+    no_respect_gitignore: bool,
+    /// List of paths, used to omit files and/or directories from analysis.
+    #[arg(
+        long,
+        value_delimiter = ',',
+        value_name = "FILE_PATTERN",
+        help_heading = "File selection"
+    )]
+    pub exclude: Option<Vec<FilePattern>>,
+
+    /// Enforce exclusions, even for paths passed to Ruff directly on the command-line.
+    /// Use `--no-force-exclude` to disable.
+    #[arg(
+        long,
+        overrides_with("no_force_exclude"),
+        help_heading = "File selection"
+    )]
+    force_exclude: bool,
+    #[clap(long, overrides_with("force_exclude"), hide = true)]
+    no_force_exclude: bool,
+    /// Set the line-length.
+    #[arg(long, help_heading = "Format configuration")]
+    pub line_length: Option<LineLength>,
+    /// Ignore all configuration files.
+    #[arg(long, conflicts_with = "config", help_heading = "Miscellaneous")]
+    pub isolated: bool,
+    /// The name of the file when passing it through stdin.
+    #[arg(long, help_heading = "Miscellaneous")]
+    pub stdin_filename: Option<PathBuf>,
+    /// The minimum Python version that should be supported.
+    #[arg(long, value_enum)]
+    pub target_version: Option<PythonVersion>,
+    /// Enable preview mode; enables unstable formatting.
+    /// Use `--no-preview` to disable.
+    #[arg(long, overrides_with("no_preview"))]
+    preview: bool,
+    #[clap(long, overrides_with("preview"), hide = true)]
+    no_preview: bool,
+}
+
+#[derive(Debug, Clone, Copy, clap::ValueEnum)]
+pub enum HelpFormat {
+    Text,
+    Json,
+}
+
+#[allow(clippy::module_name_repetitions)]
+#[derive(Debug, clap::Args)]
+pub struct LogLevelArgs {
+    /// Enable verbose logging.
+    #[arg(
+        short,
+        long,
+        global = true,
+        group = "verbosity",
+        help_heading = "Log levels"
+    )]
+    pub verbose: bool,
+    /// Print diagnostics, but nothing else.
+    #[arg(
+        short,
+        long,
+        global = true,
+        group = "verbosity",
+        help_heading = "Log levels"
+    )]
+    pub quiet: bool,
+    /// Disable all logging (but still exit with status code "1" upon detecting diagnostics).
+    #[arg(
+        short,
+        long,
+        global = true,
+        group = "verbosity",
+        help_heading = "Log levels"
+    )]
+    pub silent: bool,
+}
+
+impl From<&LogLevelArgs> for LogLevel {
+    fn from(args: &LogLevelArgs) -> Self {
+        if args.silent {
+            Self::Silent
+        } else if args.quiet {
+            Self::Quiet
+        } else if args.verbose {
+            Self::Verbose
+        } else {
+            Self::Default
+        }
+    }
+}
+
+impl CheckCommand {
+    /// Partition the CLI into command-line arguments and configuration
+    /// overrides.
+    pub fn partition(self) -> (CheckArguments, CliOverrides) {
+        (
+            CheckArguments {
+                add_noqa: self.add_noqa,
+                config: self.config,
+                diff: self.diff,
+                ecosystem_ci: self.ecosystem_ci,
+                exit_non_zero_on_fix: self.exit_non_zero_on_fix,
+                exit_zero: self.exit_zero,
+                files: self.files,
+                ignore_noqa: self.ignore_noqa,
+                isolated: self.isolated,
+                no_cache: self.no_cache,
+                output_file: self.output_file,
+                show_files: self.show_files,
+                show_settings: self.show_settings,
+                statistics: self.statistics,
+                stdin_filename: self.stdin_filename,
+                watch: self.watch,
+            },
+            CliOverrides {
+                dummy_variable_rgx: self.dummy_variable_rgx,
+                exclude: self.exclude,
+                extend_exclude: self.extend_exclude,
+                extend_fixable: self.extend_fixable,
+                extend_ignore: self.extend_ignore,
+                extend_per_file_ignores: self.extend_per_file_ignores,
+                extend_select: self.extend_select,
+                extend_unfixable: self.extend_unfixable,
+                fixable: self.fixable,
+                ignore: self.ignore,
+                line_length: self.line_length,
+                per_file_ignores: self.per_file_ignores,
+                preview: resolve_bool_arg(self.preview, self.no_preview).map(PreviewMode::from),
+                respect_gitignore: resolve_bool_arg(
+                    self.respect_gitignore,
+                    self.no_respect_gitignore,
+                ),
+                select: self.select,
+                show_source: resolve_bool_arg(self.show_source, self.no_show_source),
+                target_version: self.target_version,
+                unfixable: self.unfixable,
+                // TODO(charlie): Included in `pyproject.toml`, but not inherited.
+                cache_dir: self.cache_dir,
+                fix: resolve_bool_arg(self.fix, self.no_fix),
+                fix_only: resolve_bool_arg(self.fix_only, self.no_fix_only),
+                unsafe_fixes: resolve_bool_arg(self.unsafe_fixes, self.no_unsafe_fixes)
+                    .map(UnsafeFixes::from),
+                force_exclude: resolve_bool_arg(self.force_exclude, self.no_force_exclude),
+                output_format: self.output_format,
+                show_fixes: resolve_bool_arg(self.show_fixes, self.no_show_fixes),
+                extension: self.extension,
+            },
+        )
+    }
+}
+
+impl FormatCommand {
+    /// Partition the CLI into command-line arguments and configuration
+    /// overrides.
+    pub fn partition(self) -> (FormatArguments, CliOverrides) {
+        (
+            FormatArguments {
+                check: self.check,
+                diff: self.diff,
+                config: self.config,
+                files: self.files,
+                isolated: self.isolated,
+                no_cache: self.no_cache,
+                stdin_filename: self.stdin_filename,
+            },
+            CliOverrides {
+                line_length: self.line_length,
+                respect_gitignore: resolve_bool_arg(
+                    self.respect_gitignore,
+                    self.no_respect_gitignore,
+                ),
+                exclude: self.exclude,
+                preview: resolve_bool_arg(self.preview, self.no_preview).map(PreviewMode::from),
+                force_exclude: resolve_bool_arg(self.force_exclude, self.no_force_exclude),
+                target_version: self.target_version,
+                cache_dir: self.cache_dir,
+
+                // Unsupported on the formatter CLI, but required on `Overrides`.
+                ..CliOverrides::default()
+            },
+        )
+    }
+}
+
+fn resolve_bool_arg(yes: bool, no: bool) -> Option<bool> {
+    match (yes, no) {
+        (true, false) => Some(true),
+        (false, true) => Some(false),
+        (false, false) => None,
+        (..) => unreachable!("Clap should make this impossible"),
+    }
+}
+
+/// CLI settings that are distinct from configuration (commands, lists of files,
+/// etc.).
+#[allow(clippy::struct_excessive_bools)]
+pub struct CheckArguments {
+    pub add_noqa: bool,
+    pub config: Option<PathBuf>,
+    pub diff: bool,
+    pub ecosystem_ci: bool,
+    pub exit_non_zero_on_fix: bool,
+    pub exit_zero: bool,
+    pub files: Vec<PathBuf>,
+    pub ignore_noqa: bool,
+    pub isolated: bool,
+    pub no_cache: bool,
+    pub output_file: Option<PathBuf>,
+    pub show_files: bool,
+    pub show_settings: bool,
+    pub statistics: bool,
+    pub stdin_filename: Option<PathBuf>,
+    pub watch: bool,
+}
+
+/// CLI settings that are distinct from configuration (commands, lists of files,
+/// etc.).
+#[allow(clippy::struct_excessive_bools)]
+pub struct FormatArguments {
+    pub check: bool,
+    pub no_cache: bool,
+    pub diff: bool,
+    pub config: Option<PathBuf>,
+    pub files: Vec<PathBuf>,
+    pub isolated: bool,
+    pub stdin_filename: Option<PathBuf>,
+}
+
+/// CLI settings that function as configuration overrides.
+#[derive(Clone, Default)]
+#[allow(clippy::struct_excessive_bools)]
+pub struct CliOverrides {
+    pub dummy_variable_rgx: Option<Regex>,
+    pub exclude: Option<Vec<FilePattern>>,
+    pub extend_exclude: Option<Vec<FilePattern>>,
+    pub extend_fixable: Option<Vec<RuleSelector>>,
+    pub extend_ignore: Option<Vec<RuleSelector>>,
+    pub extend_select: Option<Vec<RuleSelector>>,
+    pub extend_unfixable: Option<Vec<RuleSelector>>,
+    pub fixable: Option<Vec<RuleSelector>>,
+    pub ignore: Option<Vec<RuleSelector>>,
+    pub line_length: Option<LineLength>,
+    pub per_file_ignores: Option<Vec<PatternPrefixPair>>,
+    pub extend_per_file_ignores: Option<Vec<PatternPrefixPair>>,
+    pub preview: Option<PreviewMode>,
+    pub respect_gitignore: Option<bool>,
+    pub select: Option<Vec<RuleSelector>>,
+    pub show_source: Option<bool>,
+    pub target_version: Option<PythonVersion>,
+    pub unfixable: Option<Vec<RuleSelector>>,
+    // TODO(charlie): Captured in pyproject.toml as a default, but not part of `Settings`.
+    pub cache_dir: Option<PathBuf>,
+    pub fix: Option<bool>,
+    pub fix_only: Option<bool>,
+    pub unsafe_fixes: Option<UnsafeFixes>,
+    pub force_exclude: Option<bool>,
+    pub output_format: Option<SerializationFormat>,
+    pub show_fixes: Option<bool>,
+    pub extension: Option<Vec<ExtensionPair>>,
+}
+
+impl ConfigurationTransformer for CliOverrides {
+    fn transform(&self, mut config: Configuration) -> Configuration {
+        if let Some(cache_dir) = &self.cache_dir {
+            config.cache_dir = Some(cache_dir.clone());
+        }
+        if let Some(dummy_variable_rgx) = &self.dummy_variable_rgx {
+            config.lint.dummy_variable_rgx = Some(dummy_variable_rgx.clone());
+        }
+        if let Some(exclude) = &self.exclude {
+            config.exclude = Some(exclude.clone());
+        }
+        if let Some(extend_exclude) = &self.extend_exclude {
+            config.extend_exclude.extend(extend_exclude.clone());
+        }
+        if let Some(extend_per_file_ignores) = &self.extend_per_file_ignores {
+            config
+                .lint
+                .extend_per_file_ignores
+                .extend(collect_per_file_ignores(extend_per_file_ignores.clone()));
+        }
+        if let Some(fix) = &self.fix {
+            config.fix = Some(*fix);
+        }
+        if let Some(fix_only) = &self.fix_only {
+            config.fix_only = Some(*fix_only);
+        }
+        if self.unsafe_fixes.is_some() {
+            config.unsafe_fixes = self.unsafe_fixes;
+        }
+        config.lint.rule_selections.push(RuleSelection {
+            select: self.select.clone(),
+            ignore: self
+                .ignore
+                .iter()
+                .cloned()
+                .chain(self.extend_ignore.iter().cloned())
+                .flatten()
+                .collect(),
+            extend_select: self.extend_select.clone().unwrap_or_default(),
+            fixable: self.fixable.clone(),
+            unfixable: self
+                .unfixable
+                .iter()
+                .cloned()
+                .chain(self.extend_unfixable.iter().cloned())
+                .flatten()
+                .collect(),
+            extend_fixable: self.extend_fixable.clone().unwrap_or_default(),
+        });
+        if let Some(output_format) = &self.output_format {
+            config.output_format = Some(*output_format);
+        }
+        if let Some(force_exclude) = &self.force_exclude {
+            config.force_exclude = Some(*force_exclude);
+        }
+        if let Some(line_length) = self.line_length {
+            config.line_length = Some(line_length);
+            config.lint.pycodestyle = Some(PycodestyleOptions {
+                max_line_length: Some(line_length),
+                ..config.lint.pycodestyle.unwrap_or_default()
+            });
+        }
+        if let Some(preview) = &self.preview {
+            config.preview = Some(*preview);
+            config.lint.preview = Some(*preview);
+            config.format.preview = Some(*preview);
+        }
+        if let Some(per_file_ignores) = &self.per_file_ignores {
+            config.lint.per_file_ignores = Some(collect_per_file_ignores(per_file_ignores.clone()));
+        }
+        if let Some(respect_gitignore) = &self.respect_gitignore {
+            config.respect_gitignore = Some(*respect_gitignore);
+        }
+        if let Some(show_source) = &self.show_source {
+            config.show_source = Some(*show_source);
+        }
+        if let Some(show_fixes) = &self.show_fixes {
+            config.show_fixes = Some(*show_fixes);
+        }
+        if let Some(target_version) = &self.target_version {
+            config.target_version = Some(*target_version);
+        }
+        if let Some(extension) = &self.extension {
+            config.lint.extension = Some(extension.clone().into_iter().collect());
+        }
+
+        config
+    }
+}
+
+/// Convert a list of `PatternPrefixPair` structs to `PerFileIgnore`.
+pub fn collect_per_file_ignores(pairs: Vec<PatternPrefixPair>) -> Vec<PerFileIgnore> {
+    let mut per_file_ignores: FxHashMap<String, Vec<RuleSelector>> = FxHashMap::default();
+    for pair in pairs {
+        per_file_ignores
+            .entry(pair.pattern)
+            .or_default()
+            .push(pair.prefix);
+    }
+    per_file_ignores
+        .into_iter()
+        .map(|(pattern, prefixes)| PerFileIgnore::new(pattern, &prefixes, None))
+        .collect()
+}

crates/ruff_cli/src/bin/ruff.rs

@@ -0,0 +1,76 @@
+use std::process::ExitCode;
+
+use clap::{Parser, Subcommand};
+use colored::Colorize;
+
+use ruff_cli::args::{Args, Command};
+use ruff_cli::{run, ExitStatus};
+
+#[cfg(target_os = "windows")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
+#[cfg(all(
+    not(target_os = "windows"),
+    not(target_os = "openbsd"),
+    any(
+        target_arch = "x86_64",
+        target_arch = "aarch64",
+        target_arch = "powerpc64"
+    )
+))]
+#[global_allocator]
+static GLOBAL: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
+
+pub fn main() -> ExitCode {
+    let args = wild::args_os();
+    let mut args =
+        argfile::expand_args_from(args, argfile::parse_fromfile, argfile::PREFIX).unwrap();
+
+    // Clap doesn't support default subcommands but we want to run `check` by
+    // default for convenience and backwards-compatibility, so we just
+    // preprocess the arguments accordingly before passing them to Clap.
+    if let Some(arg) = args.get(1) {
+        if arg
+            .to_str()
+            .is_some_and(|arg| !Command::has_subcommand(rewrite_legacy_subcommand(arg)))
+            && arg != "-h"
+            && arg != "--help"
+            && arg != "-V"
+            && arg != "--version"
+            && arg != "help"
+        {
+            args.insert(1, "check".into());
+        }
+    }
+
+    let args = Args::parse_from(args);
+
+    match run(args) {
+        Ok(code) => code.into(),
+        Err(err) => {
+            #[allow(clippy::print_stderr)]
+            {
+                // This communicates that this isn't a linter error but ruff itself hard-errored for
+                // some reason (e.g. failed to resolve the configuration)
+                eprintln!("{}", "ruff failed".red().bold());
+                // Currently we generally only see one error, but e.g. with io errors when resolving
+                // the configuration it is help to chain errors ("resolving configuration failed" ->
+                // "failed to read file: subdir/pyproject.toml")
+                for cause in err.chain() {
+                    eprintln!("  {} {cause}", "Cause:".bold());
+                }
+            }
+            ExitStatus::Error.into()
+        }
+    }
+}
+
+fn rewrite_legacy_subcommand(cmd: &str) -> &str {
+    match cmd {
+        "--explain" => "rule",
+        "--clean" => "clean",
+        "--generate-shell-completion" => "generate-shell-completion",
+        cmd => cmd,
+    }
+}

crates/ruff_cli/src/commands/add_noqa.rs

@@ -0,0 +1,83 @@
+use std::path::PathBuf;
+use std::time::Instant;
+
+use anyhow::Result;
+use log::{debug, error};
+#[cfg(not(target_family = "wasm"))]
+use rayon::prelude::*;
+
+use ruff_linter::linter::add_noqa_to_path;
+use ruff_linter::source_kind::SourceKind;
+use ruff_linter::warn_user_once;
+use ruff_python_ast::{PySourceType, SourceType};
+use ruff_workspace::resolver::{python_files_in_path, PyprojectConfig, ResolvedFile};
+
+use crate::args::CliOverrides;
+
+/// Add `noqa` directives to a collection of files.
+pub(crate) fn add_noqa(
+    files: &[PathBuf],
+    pyproject_config: &PyprojectConfig,
+    overrides: &CliOverrides,
+) -> Result<usize> {
+    // Collect all the files to check.
+    let start = Instant::now();
+    let (paths, resolver) = python_files_in_path(files, pyproject_config, overrides)?;
+    let duration = start.elapsed();
+    debug!("Identified files to lint in: {:?}", duration);
+
+    if paths.is_empty() {
+        warn_user_once!("No Python files found under the given path(s)");
+        return Ok(0);
+    }
+
+    // Discover the package root for each Python file.
+    let package_roots = resolver.package_roots(
+        &paths
+            .iter()
+            .flatten()
+            .map(ResolvedFile::path)
+            .collect::<Vec<_>>(),
+        pyproject_config,
+    );
+
+    let start = Instant::now();
+    let modifications: usize = paths
+        .par_iter()
+        .flatten()
+        .filter_map(|resolved_file| {
+            let SourceType::Python(source_type @ (PySourceType::Python | PySourceType::Stub)) =
+                SourceType::from(resolved_file.path())
+            else {
+                return None;
+            };
+            let path = resolved_file.path();
+            let package = resolved_file
+                .path()
+                .parent()
+                .and_then(|parent| package_roots.get(parent))
+                .and_then(|package| *package);
+            let settings = resolver.resolve(path, pyproject_config);
+            let source_kind = match SourceKind::from_path(path, source_type) {
+                Ok(Some(source_kind)) => source_kind,
+                Ok(None) => return None,
+                Err(e) => {
+                    error!("Failed to extract source from {}: {e}", path.display());
+                    return None;
+                }
+            };
+            match add_noqa_to_path(path, package, &source_kind, source_type, &settings.linter) {
+                Ok(count) => Some(count),
+                Err(e) => {
+                    error!("Failed to add noqa to {}: {e}", path.display());
+                    None
+                }
+            }
+        })
+        .sum();
+
+    let duration = start.elapsed();
+    debug!("Added noqa to files in: {:?}", duration);
+
+    Ok(modifications)
+}

crates/ruff_cli/src/commands/check.rs

@@ -0,0 +1,311 @@
+use std::fmt::Write;
+use std::io;
+use std::path::{Path, PathBuf};
+use std::time::Instant;
+
+use anyhow::Result;
+use colored::Colorize;
+use ignore::Error;
+use log::{debug, error, warn};
+#[cfg(not(target_family = "wasm"))]
+use rayon::prelude::*;
+use rustc_hash::FxHashMap;
+
+use ruff_diagnostics::Diagnostic;
+use ruff_linter::message::Message;
+use ruff_linter::registry::Rule;
+use ruff_linter::settings::types::UnsafeFixes;
+use ruff_linter::settings::{flags, LinterSettings};
+use ruff_linter::{fs, warn_user_once, IOError};
+use ruff_python_ast::imports::ImportMap;
+use ruff_source_file::SourceFileBuilder;
+use ruff_text_size::{TextRange, TextSize};
+use ruff_workspace::resolver::{
+    match_exclusion, python_files_in_path, PyprojectConfig, ResolvedFile,
+};
+
+use crate::args::CliOverrides;
+use crate::cache::{Cache, PackageCacheMap, PackageCaches};
+use crate::diagnostics::Diagnostics;
+use crate::panic::catch_unwind;
+
+/// Run the linter over a collection of files.
+#[allow(clippy::too_many_arguments)]
+pub(crate) fn check(
+    files: &[PathBuf],
+    pyproject_config: &PyprojectConfig,
+    overrides: &CliOverrides,
+    cache: flags::Cache,
+    noqa: flags::Noqa,
+    fix_mode: flags::FixMode,
+    unsafe_fixes: UnsafeFixes,
+) -> Result<Diagnostics> {
+    // Collect all the Python files to check.
+    let start = Instant::now();
+    let (paths, resolver) = python_files_in_path(files, pyproject_config, overrides)?;
+    debug!("Identified files to lint in: {:?}", start.elapsed());
+
+    if paths.is_empty() {
+        warn_user_once!("No Python files found under the given path(s)");
+        return Ok(Diagnostics::default());
+    }
+
+    // Discover the package root for each Python file.
+    let package_roots = resolver.package_roots(
+        &paths
+            .iter()
+            .flatten()
+            .map(ResolvedFile::path)
+            .collect::<Vec<_>>(),
+        pyproject_config,
+    );
+
+    // Load the caches.
+    let caches = if bool::from(cache) {
+        Some(PackageCacheMap::init(
+            pyproject_config,
+            &package_roots,
+            &resolver,
+        ))
+    } else {
+        None
+    };
+
+    let start = Instant::now();
+    let diagnostics_per_file = paths.par_iter().filter_map(|resolved_file| {
+        let result = match resolved_file {
+            Ok(resolved_file) => {
+                let path = resolved_file.path();
+                let package = path
+                    .parent()
+                    .and_then(|parent| package_roots.get(parent))
+                    .and_then(|package| *package);
+
+                let settings = resolver.resolve(path, pyproject_config);
+
+                if (settings.file_resolver.force_exclude || !resolved_file.is_root())
+                    && match_exclusion(
+                        resolved_file.path(),
+                        resolved_file.file_name(),
+                        &settings.linter.exclude,
+                    )
+                {
+                    return None;
+                }
+
+                let cache_root = package.unwrap_or_else(|| path.parent().unwrap_or(path));
+                let cache = caches.get(cache_root);
+
+                lint_path(
+                    path,
+                    package,
+                    &settings.linter,
+                    cache,
+                    noqa,
+                    fix_mode,
+                    unsafe_fixes,
+                )
+                .map_err(|e| {
+                    (Some(path.to_path_buf()), {
+                        let mut error = e.to_string();
+                        for cause in e.chain() {
+                            write!(&mut error, "\n  Cause: {cause}").unwrap();
+                        }
+                        error
+                    })
+                })
+            }
+            Err(e) => Err((
+                if let Error::WithPath { path, .. } = e {
+                    Some(path.clone())
+                } else {
+                    None
+                },
+                e.io_error()
+                    .map_or_else(|| e.to_string(), io::Error::to_string),
+            )),
+        };
+
+        Some(result.unwrap_or_else(|(path, message)| {
+            if let Some(path) = &path {
+                let settings = resolver.resolve(path, pyproject_config);
+                if settings.linter.rules.enabled(Rule::IOError) {
+                    let dummy =
+                        SourceFileBuilder::new(path.to_string_lossy().as_ref(), "").finish();
+
+                    Diagnostics::new(
+                        vec![Message::from_diagnostic(
+                            Diagnostic::new(IOError { message }, TextRange::default()),
+                            dummy,
+                            TextSize::default(),
+                        )],
+                        ImportMap::default(),
+                        FxHashMap::default(),
+                    )
+                } else {
+                    warn!(
+                        "{}{}{} {message}",
+                        "Failed to lint ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    );
+                    Diagnostics::default()
+                }
+            } else {
+                warn!("{} {message}", "Encountered error:".bold());
+                Diagnostics::default()
+            }
+        }))
+    });
+
+    // Aggregate the diagnostics of all checked files and count the checked files.
+    // This can't be a regular for loop because we use `par_iter`.
+    let (mut all_diagnostics, checked_files) = diagnostics_per_file
+        .fold(
+            || (Diagnostics::default(), 0u64),
+            |(all_diagnostics, checked_files), file_diagnostics| {
+                (all_diagnostics + file_diagnostics, checked_files + 1)
+            },
+        )
+        .reduce(
+            || (Diagnostics::default(), 0u64),
+            |a, b| (a.0 + b.0, a.1 + b.1),
+        );
+
+    all_diagnostics.messages.sort();
+
+    // Store the caches.
+    caches.persist()?;
+
+    let duration = start.elapsed();
+    debug!("Checked {:?} files in: {:?}", checked_files, duration);
+
+    Ok(all_diagnostics)
+}
+
+/// Wraps [`lint_path`](crate::diagnostics::lint_path) in a [`catch_unwind`](std::panic::catch_unwind) and emits
+/// a diagnostic if the linting the file panics.
+#[allow(clippy::too_many_arguments)]
+fn lint_path(
+    path: &Path,
+    package: Option<&Path>,
+    settings: &LinterSettings,
+    cache: Option<&Cache>,
+    noqa: flags::Noqa,
+    fix_mode: flags::FixMode,
+    unsafe_fixes: UnsafeFixes,
+) -> Result<Diagnostics> {
+    let result = catch_unwind(|| {
+        crate::diagnostics::lint_path(path, package, settings, cache, noqa, fix_mode, unsafe_fixes)
+    });
+
+    match result {
+        Ok(inner) => inner,
+        Err(error) => {
+            let message = r#"This indicates a bug in Ruff. If you could open an issue at:
+
+    https://github.com/astral-sh/ruff/issues/new?title=%5BLinter%20panic%5D
+
+...with the relevant file contents, the `pyproject.toml` settings, and the following stack trace, we'd be very appreciative!
+"#;
+
+            error!(
+                "{}{}{} {message}\n{error}",
+                "Panicked while linting ".bold(),
+                fs::relativize_path(path).bold(),
+                ":".bold()
+            );
+
+            Ok(Diagnostics::default())
+        }
+    }
+}
+
+#[cfg(test)]
+#[cfg(unix)]
+mod test {
+    use std::fs;
+    use std::os::unix::fs::OpenOptionsExt;
+
+    use anyhow::Result;
+    use rustc_hash::FxHashMap;
+    use tempfile::TempDir;
+
+    use ruff_linter::message::{Emitter, EmitterContext, TextEmitter};
+    use ruff_linter::registry::Rule;
+    use ruff_linter::settings::types::UnsafeFixes;
+    use ruff_linter::settings::{flags, LinterSettings};
+    use ruff_workspace::resolver::{PyprojectConfig, PyprojectDiscoveryStrategy};
+    use ruff_workspace::Settings;
+
+    use crate::args::CliOverrides;
+
+    use super::check;
+
+    /// We check that regular python files, pyproject.toml and jupyter notebooks all handle io
+    /// errors gracefully
+    #[test]
+    fn unreadable_files() -> Result<()> {
+        let path = "E902.py";
+        let rule_code = Rule::IOError;
+
+        // Create inaccessible files
+        let tempdir = TempDir::new()?;
+        let pyproject_toml = tempdir.path().join("pyproject.toml");
+        let python_file = tempdir.path().join("code.py");
+        let notebook = tempdir.path().join("notebook.ipynb");
+        for file in [&pyproject_toml, &python_file, &notebook] {
+            fs::OpenOptions::new()
+                .create(true)
+                .write(true)
+                .mode(0o000)
+                .open(file)?;
+        }
+
+        // Configure
+        let snapshot = format!("{}_{}", rule_code.noqa_code(), path);
+        // invalid pyproject.toml is not active by default
+        let settings = Settings {
+            linter: LinterSettings::for_rules(vec![rule_code, Rule::InvalidPyprojectToml]),
+            ..Settings::default()
+        };
+        let pyproject_config =
+            PyprojectConfig::new(PyprojectDiscoveryStrategy::Fixed, settings, None);
+
+        // Run
+        let diagnostics = check(
+            // Notebooks are not included by default
+            &[tempdir.path().to_path_buf(), notebook],
+            &pyproject_config,
+            &CliOverrides::default(),
+            flags::Cache::Disabled,
+            flags::Noqa::Disabled,
+            flags::FixMode::Generate,
+            UnsafeFixes::Enabled,
+        )
+        .unwrap();
+        let mut output = Vec::new();
+
+        TextEmitter::default()
+            .with_show_fix_status(true)
+            .emit(
+                &mut output,
+                &diagnostics.messages,
+                &EmitterContext::new(&FxHashMap::default()),
+            )
+            .unwrap();
+
+        let messages = String::from_utf8(output).unwrap();
+
+        insta::with_settings!({
+            omit_expression => true,
+            filters => vec![
+                // The tempdir is always different (and platform dependent)
+                (tempdir.path().to_str().unwrap(), "/home/ferris/project"),
+            ]
+        }, {
+            insta::assert_snapshot!(snapshot, messages);
+        });
+        Ok(())
+    }
+}

crates/ruff_cli/src/commands/check_stdin.rs

@@ -0,0 +1,50 @@
+use std::path::Path;
+
+use anyhow::Result;
+
+use ruff_linter::packaging;
+use ruff_linter::settings::flags;
+use ruff_workspace::resolver::{match_exclusion, python_file_at_path, PyprojectConfig};
+
+use crate::args::CliOverrides;
+use crate::diagnostics::{lint_stdin, Diagnostics};
+use crate::stdin::read_from_stdin;
+
+/// Run the linter over a single file, read from `stdin`.
+pub(crate) fn check_stdin(
+    filename: Option<&Path>,
+    pyproject_config: &PyprojectConfig,
+    overrides: &CliOverrides,
+    noqa: flags::Noqa,
+    fix_mode: flags::FixMode,
+) -> Result<Diagnostics> {
+    if pyproject_config.settings.file_resolver.force_exclude {
+        if let Some(filename) = filename {
+            if !python_file_at_path(filename, pyproject_config, overrides)? {
+                return Ok(Diagnostics::default());
+            }
+
+            let lint_settings = &pyproject_config.settings.linter;
+            if filename
+                .file_name()
+                .is_some_and(|name| match_exclusion(filename, name, &lint_settings.exclude))
+            {
+                return Ok(Diagnostics::default());
+            }
+        }
+    }
+    let package_root = filename.and_then(Path::parent).and_then(|path| {
+        packaging::detect_package_root(path, &pyproject_config.settings.linter.namespace_packages)
+    });
+    let stdin = read_from_stdin()?;
+    let mut diagnostics = lint_stdin(
+        filename,
+        package_root,
+        stdin,
+        &pyproject_config.settings,
+        noqa,
+        fix_mode,
+    )?;
+    diagnostics.messages.sort_unstable();
+    Ok(diagnostics)
+}

crates/ruff_cli/src/commands/clean.rs

@@ -0,0 +1,34 @@
+use std::fs::remove_dir_all;
+use std::io::{self, BufWriter, Write};
+
+use anyhow::Result;
+use colored::Colorize;
+use path_absolutize::path_dedot;
+use walkdir::WalkDir;
+
+use ruff_cache::CACHE_DIR_NAME;
+use ruff_linter::fs;
+use ruff_linter::logging::LogLevel;
+
+/// Clear any caches in the current directory or any subdirectories.
+pub(crate) fn clean(level: LogLevel) -> Result<()> {
+    let mut stderr = BufWriter::new(io::stderr().lock());
+    for entry in WalkDir::new(&*path_dedot::CWD)
+        .into_iter()
+        .filter_map(Result::ok)
+        .filter(|entry| entry.file_type().is_dir())
+    {
+        let cache = entry.path().join(CACHE_DIR_NAME);
+        if cache.is_dir() {
+            if level >= LogLevel::Default {
+                writeln!(
+                    stderr,
+                    "Removing cache at: {}",
+                    fs::relativize_path(&cache).bold()
+                )?;
+            }
+            remove_dir_all(&cache)?;
+        }
+    }
+    Ok(())
+}

crates/ruff_cli/src/commands/config.rs

@@ -0,0 +1,20 @@
+use anyhow::{anyhow, Result};
+
+use ruff_workspace::options::Options;
+use ruff_workspace::options_base::OptionsMetadata;
+
+#[allow(clippy::print_stdout)]
+pub(crate) fn config(key: Option<&str>) -> Result<()> {
+    match key {
+        None => print!("{}", Options::metadata()),
+        Some(key) => match Options::metadata().find(key) {
+            None => {
+                return Err(anyhow!("Unknown option: {key}"));
+            }
+            Some(entry) => {
+                print!("{entry}");
+            }
+        },
+    }
+    Ok(())
+}

crates/ruff_cli/src/commands/format.rs

@@ -0,0 +1,812 @@
+use std::fmt::{Display, Formatter};
+use std::fs::File;
+use std::io;
+use std::io::{stderr, stdout, Write};
+use std::path::{Path, PathBuf};
+use std::time::Instant;
+
+use anyhow::Result;
+use colored::Colorize;
+use itertools::Itertools;
+use log::{error, warn};
+use rayon::iter::Either::{Left, Right};
+use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
+use rustc_hash::FxHashSet;
+use thiserror::Error;
+use tracing::debug;
+
+use ruff_diagnostics::SourceMap;
+use ruff_linter::fs;
+use ruff_linter::logging::LogLevel;
+use ruff_linter::registry::Rule;
+use ruff_linter::rules::flake8_quotes::settings::Quote;
+use ruff_linter::source_kind::{SourceError, SourceKind};
+use ruff_linter::warn_user_once;
+use ruff_python_ast::{PySourceType, SourceType};
+use ruff_python_formatter::{format_module_source, FormatModuleError, QuoteStyle};
+use ruff_text_size::{TextLen, TextRange, TextSize};
+use ruff_workspace::resolver::{
+    match_exclusion, python_files_in_path, PyprojectConfig, ResolvedFile, Resolver,
+};
+use ruff_workspace::FormatterSettings;
+
+use crate::args::{CliOverrides, FormatArguments};
+use crate::cache::{Cache, FileCacheKey, PackageCacheMap, PackageCaches};
+use crate::panic::{catch_unwind, PanicError};
+use crate::resolve::resolve;
+use crate::ExitStatus;
+
+#[derive(Debug, Copy, Clone, is_macro::Is)]
+pub(crate) enum FormatMode {
+    /// Write the formatted contents back to the file.
+    Write,
+    /// Check if the file is formatted, but do not write the formatted contents back.
+    Check,
+    /// Check if the file is formatted, show a diff if not.
+    Diff,
+}
+
+impl FormatMode {
+    pub(crate) fn from_cli(cli: &FormatArguments) -> Self {
+        if cli.diff {
+            FormatMode::Diff
+        } else if cli.check {
+            FormatMode::Check
+        } else {
+            FormatMode::Write
+        }
+    }
+}
+
+/// Format a set of files, and return the exit status.
+pub(crate) fn format(
+    cli: &FormatArguments,
+    overrides: &CliOverrides,
+    log_level: LogLevel,
+) -> Result<ExitStatus> {
+    let pyproject_config = resolve(
+        cli.isolated,
+        cli.config.as_deref(),
+        overrides,
+        cli.stdin_filename.as_deref(),
+    )?;
+    let mode = FormatMode::from_cli(cli);
+    let (paths, resolver) = python_files_in_path(&cli.files, &pyproject_config, overrides)?;
+
+    if paths.is_empty() {
+        warn_user_once!("No Python files found under the given path(s)");
+        return Ok(ExitStatus::Success);
+    }
+
+    warn_incompatible_formatter_settings(&pyproject_config, Some(&resolver));
+
+    // Discover the package root for each Python file.
+    let package_roots = resolver.package_roots(
+        &paths
+            .iter()
+            .flatten()
+            .map(ResolvedFile::path)
+            .collect::<Vec<_>>(),
+        &pyproject_config,
+    );
+
+    let caches = if cli.no_cache {
+        None
+    } else {
+        // `--no-cache` doesn't respect code changes, and so is often confusing during
+        // development.
+        #[cfg(debug_assertions)]
+        crate::warn_user!("Detected debug build without --no-cache.");
+
+        Some(PackageCacheMap::init(
+            &pyproject_config,
+            &package_roots,
+            &resolver,
+        ))
+    };
+
+    let start = Instant::now();
+    let (results, mut errors): (Vec<_>, Vec<_>) = paths
+        .par_iter()
+        .filter_map(|entry| {
+            match entry {
+                Ok(resolved_file) => {
+                    let path = resolved_file.path();
+                    let SourceType::Python(source_type) = SourceType::from(&path) else {
+                        // Ignore any non-Python files.
+                        return None;
+                    };
+
+                    let settings = resolver.resolve(path, &pyproject_config);
+
+                    // Ignore files that are excluded from formatting
+                    if (settings.file_resolver.force_exclude || !resolved_file.is_root())
+                        && match_exclusion(
+                            path,
+                            resolved_file.file_name(),
+                            &settings.formatter.exclude,
+                        )
+                    {
+                        return None;
+                    }
+
+                    let package = path
+                        .parent()
+                        .and_then(|parent| package_roots.get(parent).copied())
+                        .flatten();
+                    let cache_root = package.unwrap_or_else(|| path.parent().unwrap_or(path));
+                    let cache = caches.get(cache_root);
+
+                    Some(
+                        match catch_unwind(|| {
+                            format_path(path, &settings.formatter, source_type, mode, cache)
+                        }) {
+                            Ok(inner) => inner.map(|result| FormatPathResult {
+                                path: resolved_file.path().to_path_buf(),
+                                result,
+                            }),
+                            Err(error) => Err(FormatCommandError::Panic(
+                                Some(resolved_file.path().to_path_buf()),
+                                error,
+                            )),
+                        },
+                    )
+                }
+                Err(err) => Some(Err(FormatCommandError::Ignore(err.clone()))),
+            }
+        })
+        .partition_map(|result| match result {
+            Ok(diagnostic) => Left(diagnostic),
+            Err(err) => Right(err),
+        });
+    let duration = start.elapsed();
+
+    debug!(
+        "Formatted {} files in {:.2?}",
+        results.len() + errors.len(),
+        duration
+    );
+
+    caches.persist()?;
+
+    // Report on any errors.
+    errors.sort_unstable_by(|a, b| a.path().cmp(&b.path()));
+
+    for error in &errors {
+        error!("{error}");
+    }
+
+    let results = FormatResults::new(results.as_slice(), mode);
+    match mode {
+        FormatMode::Write => {}
+        FormatMode::Check => {
+            results.write_changed(&mut stdout().lock())?;
+        }
+        FormatMode::Diff => {
+            results.write_diff(&mut stdout().lock())?;
+        }
+    }
+
+    // Report on the formatting changes.
+    if log_level >= LogLevel::Default {
+        if mode.is_diff() {
+            // Allow piping the diff to e.g. a file by writing the summary to stderr
+            results.write_summary(&mut stderr().lock())?;
+        } else {
+            results.write_summary(&mut stdout().lock())?;
+        }
+    }
+
+    match mode {
+        FormatMode::Write => {
+            if errors.is_empty() {
+                Ok(ExitStatus::Success)
+            } else {
+                Ok(ExitStatus::Error)
+            }
+        }
+        FormatMode::Check | FormatMode::Diff => {
+            if errors.is_empty() {
+                if results.any_formatted() {
+                    Ok(ExitStatus::Failure)
+                } else {
+                    Ok(ExitStatus::Success)
+                }
+            } else {
+                Ok(ExitStatus::Error)
+            }
+        }
+    }
+}
+
+/// Format the file at the given [`Path`].
+#[tracing::instrument(level="debug", skip_all, fields(path = %path.display()))]
+pub(crate) fn format_path(
+    path: &Path,
+    settings: &FormatterSettings,
+    source_type: PySourceType,
+    mode: FormatMode,
+    cache: Option<&Cache>,
+) -> Result<FormatResult, FormatCommandError> {
+    if let Some(cache) = cache {
+        let relative_path = cache
+            .relative_path(path)
+            .expect("wrong package cache for file");
+
+        if let Ok(cache_key) = FileCacheKey::from_path(path) {
+            if cache.is_formatted(relative_path, &cache_key) {
+                return Ok(FormatResult::Unchanged);
+            }
+        }
+    }
+
+    // Extract the sources from the file.
+    let unformatted = match SourceKind::from_path(path, source_type) {
+        Ok(Some(source_kind)) => source_kind,
+        // Non Python Jupyter notebook
+        Ok(None) => return Ok(FormatResult::Skipped),
+        Err(err) => {
+            return Err(FormatCommandError::Read(Some(path.to_path_buf()), err));
+        }
+    };
+
+    // Format the source.
+    let format_result = match format_source(&unformatted, source_type, Some(path), settings)? {
+        FormattedSource::Formatted(formatted) => match mode {
+            FormatMode::Write => {
+                let mut writer = File::create(path).map_err(|err| {
+                    FormatCommandError::Write(Some(path.to_path_buf()), err.into())
+                })?;
+                formatted
+                    .write(&mut writer)
+                    .map_err(|err| FormatCommandError::Write(Some(path.to_path_buf()), err))?;
+
+                if let Some(cache) = cache {
+                    if let Ok(cache_key) = FileCacheKey::from_path(path) {
+                        let relative_path = cache
+                            .relative_path(path)
+                            .expect("wrong package cache for file");
+                        cache.set_formatted(relative_path.to_path_buf(), &cache_key);
+                    }
+                }
+
+                FormatResult::Formatted
+            }
+            FormatMode::Check => FormatResult::Formatted,
+            FormatMode::Diff => FormatResult::Diff {
+                unformatted,
+                formatted,
+            },
+        },
+        FormattedSource::Unchanged => {
+            if let Some(cache) = cache {
+                if let Ok(cache_key) = FileCacheKey::from_path(path) {
+                    let relative_path = cache
+                        .relative_path(path)
+                        .expect("wrong package cache for file");
+                    cache.set_formatted(relative_path.to_path_buf(), &cache_key);
+                }
+            }
+
+            FormatResult::Unchanged
+        }
+    };
+
+    Ok(format_result)
+}
+
+#[derive(Debug)]
+pub(crate) enum FormattedSource {
+    /// The source was formatted, and the [`SourceKind`] contains the transformed source code.
+    Formatted(SourceKind),
+    /// The source was unchanged.
+    Unchanged,
+}
+
+impl From<FormattedSource> for FormatResult {
+    fn from(value: FormattedSource) -> Self {
+        match value {
+            FormattedSource::Formatted(_) => FormatResult::Formatted,
+            FormattedSource::Unchanged => FormatResult::Unchanged,
+        }
+    }
+}
+
+/// Format a [`SourceKind`], returning the transformed [`SourceKind`], or `None` if the source was
+/// unchanged.
+pub(crate) fn format_source(
+    source_kind: &SourceKind,
+    source_type: PySourceType,
+    path: Option<&Path>,
+    settings: &FormatterSettings,
+) -> Result<FormattedSource, FormatCommandError> {
+    match source_kind {
+        SourceKind::Python(unformatted) => {
+            let options = settings.to_format_options(source_type, unformatted);
+
+            let formatted = format_module_source(unformatted, options)
+                .map_err(|err| FormatCommandError::Format(path.map(Path::to_path_buf), err))?;
+
+            let formatted = formatted.into_code();
+            if formatted.len() == unformatted.len() && formatted == *unformatted {
+                Ok(FormattedSource::Unchanged)
+            } else {
+                Ok(FormattedSource::Formatted(SourceKind::Python(formatted)))
+            }
+        }
+        SourceKind::IpyNotebook(notebook) => {
+            if !notebook.is_python_notebook() {
+                return Ok(FormattedSource::Unchanged);
+            }
+
+            let options = settings.to_format_options(source_type, notebook.source_code());
+
+            let mut output: Option<String> = None;
+            let mut last: Option<TextSize> = None;
+            let mut source_map = SourceMap::default();
+
+            // Format each cell individually.
+            for (start, end) in notebook.cell_offsets().iter().tuple_windows::<(_, _)>() {
+                let range = TextRange::new(*start, *end);
+                let unformatted = &notebook.source_code()[range];
+
+                // Format the cell.
+                let formatted = format_module_source(unformatted, options.clone())
+                    .map_err(|err| FormatCommandError::Format(path.map(Path::to_path_buf), err))?;
+
+                // If the cell is unchanged, skip it.
+                let formatted = formatted.as_code();
+                if formatted.len() == unformatted.len() && formatted == unformatted {
+                    continue;
+                }
+
+                // If this is the first newly-formatted cell, initialize the output.
+                let output = output
+                    .get_or_insert_with(|| String::with_capacity(notebook.source_code().len()));
+
+                // Add all contents from `last` to the current cell.
+                let slice = &notebook.source_code()
+                    [TextRange::new(last.unwrap_or_default(), range.start())];
+                output.push_str(slice);
+
+                // Add the start source marker for the cell.
+                source_map.push_marker(*start, output.text_len());
+
+                // Add the cell itself.
+                output.push_str(formatted);
+
+                // Add the end source marker for the added cell.
+                source_map.push_marker(*end, output.text_len());
+
+                // Track that the cell was formatted.
+                last = Some(*end);
+            }
+
+            // If the file was unchanged, return `None`.
+            let (Some(mut output), Some(last)) = (output, last) else {
+                return Ok(FormattedSource::Unchanged);
+            };
+
+            // Add the remaining content.
+            let slice = &notebook.source_code()[usize::from(last)..];
+            output.push_str(slice);
+
+            // Update the notebook.
+            let mut formatted = notebook.clone();
+            formatted.update(&source_map, output);
+
+            Ok(FormattedSource::Formatted(SourceKind::IpyNotebook(
+                formatted,
+            )))
+        }
+    }
+}
+
+/// The result of an individual formatting operation.
+#[derive(Debug, Clone, is_macro::Is)]
+pub(crate) enum FormatResult {
+    /// The file was formatted.
+    Formatted,
+    /// The file was formatted, [`SourceKind`] contains the formatted code
+    Diff {
+        unformatted: SourceKind,
+        formatted: SourceKind,
+    },
+    /// The file was unchanged, as the formatted contents matched the existing contents.
+    Unchanged,
+
+    /// Skipped formatting because its an unsupported file format
+    Skipped,
+}
+
+/// The coupling of a [`FormatResult`] with the path of the file that was analyzed.
+#[derive(Debug)]
+struct FormatPathResult {
+    path: PathBuf,
+    result: FormatResult,
+}
+
+/// The results of formatting a set of files
+#[derive(Debug)]
+struct FormatResults<'a> {
+    /// The individual formatting results.
+    results: &'a [FormatPathResult],
+    /// The format mode that was used.
+    mode: FormatMode,
+}
+
+impl<'a> FormatResults<'a> {
+    fn new(results: &'a [FormatPathResult], mode: FormatMode) -> Self {
+        Self { results, mode }
+    }
+
+    /// Returns `true` if any of the files require formatting.
+    fn any_formatted(&self) -> bool {
+        self.results.iter().any(|result| match result.result {
+            FormatResult::Formatted | FormatResult::Diff { .. } => true,
+            FormatResult::Unchanged | FormatResult::Skipped => false,
+        })
+    }
+
+    /// Write a diff of the formatting changes to the given writer.
+    fn write_diff(&self, f: &mut impl Write) -> io::Result<()> {
+        for (path, unformatted, formatted) in self
+            .results
+            .iter()
+            .filter_map(|result| {
+                if let FormatResult::Diff {
+                    unformatted,
+                    formatted,
+                } = &result.result
+                {
+                    Some((result.path.as_path(), unformatted, formatted))
+                } else {
+                    None
+                }
+            })
+            .sorted_unstable_by_key(|(path, _, _)| *path)
+        {
+            unformatted.diff(formatted, Some(path), f)?;
+        }
+
+        Ok(())
+    }
+
+    /// Write a list of the files that would be changed to the given writer.
+    fn write_changed(&self, f: &mut impl Write) -> io::Result<()> {
+        for path in self
+            .results
+            .iter()
+            .filter_map(|result| {
+                if result.result.is_formatted() {
+                    Some(result.path.as_path())
+                } else {
+                    None
+                }
+            })
+            .sorted_unstable()
+        {
+            writeln!(f, "Would reformat: {}", fs::relativize_path(path).bold())?;
+        }
+
+        Ok(())
+    }
+
+    /// Write a summary of the formatting results to the given writer.
+    fn write_summary(&self, f: &mut impl Write) -> io::Result<()> {
+        // Compute the number of changed and unchanged files.
+        let mut changed = 0u32;
+        let mut unchanged = 0u32;
+        for result in self.results {
+            match &result.result {
+                FormatResult::Formatted => {
+                    changed += 1;
+                }
+                FormatResult::Unchanged => unchanged += 1,
+                FormatResult::Diff { .. } => {
+                    changed += 1;
+                }
+                FormatResult::Skipped => {}
+            }
+        }
+
+        // Write out a summary of the formatting results.
+        if changed > 0 && unchanged > 0 {
+            writeln!(
+                f,
+                "{} file{} {}, {} file{} left unchanged",
+                changed,
+                if changed == 1 { "" } else { "s" },
+                match self.mode {
+                    FormatMode::Write => "reformatted",
+                    FormatMode::Check | FormatMode::Diff => "would be reformatted",
+                },
+                unchanged,
+                if unchanged == 1 { "" } else { "s" },
+            )
+        } else if changed > 0 {
+            writeln!(
+                f,
+                "{} file{} {}",
+                changed,
+                if changed == 1 { "" } else { "s" },
+                match self.mode {
+                    FormatMode::Write => "reformatted",
+                    FormatMode::Check | FormatMode::Diff => "would be reformatted",
+                }
+            )
+        } else if unchanged > 0 {
+            writeln!(
+                f,
+                "{} file{} left unchanged",
+                unchanged,
+                if unchanged == 1 { "" } else { "s" },
+            )
+        } else {
+            Ok(())
+        }
+    }
+}
+
+/// An error that can occur while formatting a set of files.
+#[derive(Error, Debug)]
+pub(crate) enum FormatCommandError {
+    Ignore(#[from] ignore::Error),
+    Panic(Option<PathBuf>, PanicError),
+    Read(Option<PathBuf>, SourceError),
+    Format(Option<PathBuf>, FormatModuleError),
+    Write(Option<PathBuf>, SourceError),
+    Diff(Option<PathBuf>, io::Error),
+}
+
+impl FormatCommandError {
+    fn path(&self) -> Option<&Path> {
+        match self {
+            Self::Ignore(err) => {
+                if let ignore::Error::WithPath { path, .. } = err {
+                    Some(path.as_path())
+                } else {
+                    None
+                }
+            }
+            Self::Panic(path, _)
+            | Self::Read(path, _)
+            | Self::Format(path, _)
+            | Self::Write(path, _)
+            | Self::Diff(path, _) => path.as_deref(),
+        }
+    }
+}
+
+impl Display for FormatCommandError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Ignore(err) => {
+                if let ignore::Error::WithPath { path, .. } = err {
+                    write!(
+                        f,
+                        "{}{}{} {}",
+                        "Failed to format ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold(),
+                        err.io_error()
+                            .map_or_else(|| err.to_string(), std::string::ToString::to_string)
+                    )
+                } else {
+                    write!(
+                        f,
+                        "{} {}",
+                        "Encountered error:".bold(),
+                        err.io_error()
+                            .map_or_else(|| err.to_string(), std::string::ToString::to_string)
+                    )
+                }
+            }
+            Self::Read(path, err) => {
+                if let Some(path) = path {
+                    write!(
+                        f,
+                        "{}{}{} {err}",
+                        "Failed to read ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    )
+                } else {
+                    write!(f, "{}{} {err}", "Failed to read".bold(), ":".bold())
+                }
+            }
+            Self::Write(path, err) => {
+                if let Some(path) = path {
+                    write!(
+                        f,
+                        "{}{}{} {err}",
+                        "Failed to write ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    )
+                } else {
+                    write!(f, "{}{} {err}", "Failed to write".bold(), ":".bold())
+                }
+            }
+            Self::Format(path, err) => {
+                if let Some(path) = path {
+                    write!(
+                        f,
+                        "{}{}{} {err}",
+                        "Failed to format ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    )
+                } else {
+                    write!(f, "{}{} {err}", "Failed to format".bold(), ":".bold())
+                }
+            }
+            Self::Diff(path, err) => {
+                if let Some(path) = path {
+                    write!(
+                        f,
+                        "{}{}{} {err}",
+                        "Failed to generate diff for ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    )
+                } else {
+                    write!(
+                        f,
+                        "{}{} {err}",
+                        "Failed to generate diff".bold(),
+                        ":".bold()
+                    )
+                }
+            }
+            Self::Panic(path, err) => {
+                let message = r#"This indicates a bug in Ruff. If you could open an issue at:
+
+    https://github.com/astral-sh/ruff/issues/new?title=%5BFormatter%20panic%5D
+
+...with the relevant file contents, the `pyproject.toml` settings, and the following stack trace, we'd be very appreciative!
+"#;
+                if let Some(path) = path {
+                    write!(
+                        f,
+                        "{}{}{} {message}\n{err}",
+                        "Panicked while formatting ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    )
+                } else {
+                    write!(
+                        f,
+                        "{} {message}\n{err}",
+                        "Panicked while formatting.".bold()
+                    )
+                }
+            }
+        }
+    }
+}
+
+pub(super) fn warn_incompatible_formatter_settings(
+    pyproject_config: &PyprojectConfig,
+    resolver: Option<&Resolver>,
+) {
+    // First, collect all rules that are incompatible regardless of the linter-specific settings.
+    let mut incompatible_rules = FxHashSet::default();
+    for setting in std::iter::once(&pyproject_config.settings)
+        .chain(resolver.iter().flat_map(|resolver| resolver.settings()))
+    {
+        for rule in [
+            // The formatter might collapse implicit string concatenation on a single line.
+            Rule::SingleLineImplicitStringConcatenation,
+            // Flags missing trailing commas when all arguments are on its own line:
+            // ```python
+            // def args(
+            //     aaaaaaaa, bbbbbbbbb, cccccccccc, ddddddddd, eeeeeeee, ffffff, gggggggggggg, hhhh
+            // ):
+            //     pass
+            // ```
+            Rule::MissingTrailingComma,
+        ] {
+            if setting.linter.rules.enabled(rule) {
+                incompatible_rules.insert(rule);
+            }
+        }
+    }
+
+    if !incompatible_rules.is_empty() {
+        let mut rule_names: Vec<_> = incompatible_rules
+            .into_iter()
+            .map(|rule| format!("`{}`", rule.noqa_code()))
+            .collect();
+        rule_names.sort();
+        warn_user_once!("The following rules may cause conflicts when used with the formatter: {}. To avoid unexpected behavior, we recommend disabling these rules, either by removing them from the `select` or `extend-select` configuration, or adding them to the `ignore` configuration.", rule_names.join(", "));
+    }
+
+    // Next, validate settings-specific incompatibilities.
+    for setting in std::iter::once(&pyproject_config.settings)
+        .chain(resolver.iter().flat_map(|resolver| resolver.settings()))
+    {
+        // Validate all rules that rely on tab styles.
+        if setting.linter.rules.enabled(Rule::TabIndentation)
+            && setting.formatter.indent_style.is_tab()
+        {
+            warn_user_once!("The `format.indent-style=\"tab\"` option is incompatible with `W191`, which lints against all uses of tabs. We recommend disabling these rules when using the formatter, which enforces a consistent indentation style. Alternatively, set the `format.indent-style` option to `\"space\"`.");
+        }
+
+        // Validate all rules that rely on tab styles.
+        if setting.linter.rules.enabled(Rule::IndentWithSpaces)
+            && setting.formatter.indent_style.is_tab()
+        {
+            warn_user_once!("The `format.indent-style=\"tab\"` option is incompatible with `D206`, with requires space-based indentation. We recommend disabling these rules when using the formatter, which enforces a consistent indentation style. Alternatively, set the `format.indent-style` option to `\"space\"`.");
+        }
+
+        // Validate all rules that rely on custom indent widths.
+        if setting.linter.rules.any_enabled(&[
+            Rule::IndentationWithInvalidMultiple,
+            Rule::IndentationWithInvalidMultipleComment,
+        ]) && setting.formatter.indent_width.value() != 4
+        {
+            warn_user_once!("The `format.indent-width` option with a value other than 4 is incompatible with `E111` and `E114`. We recommend disabling these rules when using the formatter, which enforces a consistent indentation width. Alternatively, set the `format.indent-width` option to `4`.");
+        }
+
+        // Validate all rules that rely on quote styles.
+        if setting
+            .linter
+            .rules
+            .any_enabled(&[Rule::BadQuotesInlineString, Rule::AvoidableEscapedQuote])
+        {
+            match (
+                setting.linter.flake8_quotes.inline_quotes,
+                setting.formatter.quote_style,
+            ) {
+                (Quote::Double, QuoteStyle::Single) => {
+                    warn_user_once!("The `flake8-quotes.inline-quotes=\"double\"` option is incompatible with the formatter's `format.quote-style=\"single\"`. We recommend disabling `Q000` and `Q003` when using the formatter, which enforces a consistent quote style. Alternatively, set both options to either `\"single\"` or `\"double\"`.");
+                }
+                (Quote::Single, QuoteStyle::Double) => {
+                    warn_user_once!("The `flake8-quotes.inline-quotes=\"single\"` option is incompatible with the formatter's `format.quote-style=\"double\"`. We recommend disabling `Q000` and `Q003` when using the formatter, which enforces a consistent quote style. Alternatively, set both options to either `\"single\"` or `\"double\"`.");
+                }
+                _ => {}
+            }
+        }
+
+        if setting.linter.rules.enabled(Rule::BadQuotesMultilineString)
+            && setting.linter.flake8_quotes.multiline_quotes == Quote::Single
+        {
+            warn_user_once!("The `flake8-quotes.multiline-quotes=\"single\"` option is incompatible with the formatter. We recommend disabling `Q001` when using the formatter, which enforces double quotes for multiline strings. Alternatively, set the `flake8-quotes.multiline-quotes` option to `\"double\"`.`");
+        }
+
+        if setting.linter.rules.enabled(Rule::BadQuotesDocstring)
+            && setting.linter.flake8_quotes.docstring_quotes == Quote::Single
+        {
+            warn_user_once!("The `flake8-quotes.multiline-quotes=\"single\"` option is incompatible with the formatter. We recommend disabling `Q002` when using the formatter, which enforces double quotes for docstrings. Alternatively, set the `flake8-quotes.docstring-quotes` option to `\"double\"`.`");
+        }
+
+        // Validate all isort settings.
+        if setting.linter.rules.enabled(Rule::UnsortedImports) {
+            // The formatter removes empty lines if the value is larger than 2 but always inserts a empty line after imports.
+            // Two empty lines are okay because `isort` only uses this setting for top-level imports (not in nested blocks).
+            if !matches!(setting.linter.isort.lines_after_imports, 1 | 2 | -1) {
+                warn_user_once!("The isort option `isort.lines-after-imports` with a value other than `-1`, `1` or `2` is incompatible with the formatter. To avoid unexpected behavior, we recommend setting the option to one of: `2`, `1`, or `-1` (default).");
+            }
+
+            // Values larger than two get reduced to one line by the formatter if the import is in a nested block.
+            if setting.linter.isort.lines_between_types > 1 {
+                warn_user_once!("The isort option `isort.lines-between-types` with a value greater than 1 is incompatible with the formatter. To avoid unexpected behavior, we recommend setting the option to one of: `1` or `0` (default).");
+            }
+
+            // isort inserts a trailing comma which the formatter preserves, but only if `skip-magic-trailing-comma` isn't false.
+            // This isn't relevant when using `force-single-line`, since isort will never include a trailing comma in that case.
+            if setting.formatter.magic_trailing_comma.is_ignore()
+                && !setting.linter.isort.force_single_line
+            {
+                if setting.linter.isort.force_wrap_aliases {
+                    warn_user_once!("The isort option `isort.force-wrap-aliases` is incompatible with the formatter `format.skip-magic-trailing-comma=true` option. To avoid unexpected behavior, we recommend either setting `isort.force-wrap-aliases=false` or `format.skip-magic-trailing-comma=false`.");
+                }
+
+                if setting.linter.isort.split_on_trailing_comma {
+                    warn_user_once!("The isort option `isort.split-on-trailing-comma` is incompatible with the formatter `format.skip-magic-trailing-comma=true` option. To avoid unexpected behavior, we recommend either setting `isort.split-on-trailing-comma=false` or `format.skip-magic-trailing-comma=false`.");
+                }
+            }
+        }
+    }
+}

crates/ruff_cli/src/commands/format_stdin.rs

@@ -0,0 +1,129 @@
+use std::io::stdout;
+use std::path::Path;
+
+use anyhow::Result;
+use log::error;
+
+use ruff_linter::source_kind::SourceKind;
+use ruff_python_ast::{PySourceType, SourceType};
+use ruff_workspace::resolver::{match_exclusion, python_file_at_path};
+use ruff_workspace::FormatterSettings;
+
+use crate::args::{CliOverrides, FormatArguments};
+use crate::commands::format::{
+    format_source, warn_incompatible_formatter_settings, FormatCommandError, FormatMode,
+    FormatResult, FormattedSource,
+};
+use crate::resolve::resolve;
+use crate::stdin::read_from_stdin;
+use crate::ExitStatus;
+
+/// Run the formatter over a single file, read from `stdin`.
+pub(crate) fn format_stdin(cli: &FormatArguments, overrides: &CliOverrides) -> Result<ExitStatus> {
+    let pyproject_config = resolve(
+        cli.isolated,
+        cli.config.as_deref(),
+        overrides,
+        cli.stdin_filename.as_deref(),
+    )?;
+
+    warn_incompatible_formatter_settings(&pyproject_config, None);
+
+    let mode = FormatMode::from_cli(cli);
+
+    if pyproject_config.settings.file_resolver.force_exclude {
+        if let Some(filename) = cli.stdin_filename.as_deref() {
+            if !python_file_at_path(filename, &pyproject_config, overrides)? {
+                return Ok(ExitStatus::Success);
+            }
+
+            let format_settings = &pyproject_config.settings.formatter;
+            if filename
+                .file_name()
+                .is_some_and(|name| match_exclusion(filename, name, &format_settings.exclude))
+            {
+                return Ok(ExitStatus::Success);
+            }
+        }
+    }
+
+    let path = cli.stdin_filename.as_deref();
+
+    let SourceType::Python(source_type) = path.map(SourceType::from).unwrap_or_default() else {
+        return Ok(ExitStatus::Success);
+    };
+
+    // Format the file.
+    match format_source_code(
+        path,
+        &pyproject_config.settings.formatter,
+        source_type,
+        mode,
+    ) {
+        Ok(result) => match mode {
+            FormatMode::Write => Ok(ExitStatus::Success),
+            FormatMode::Check | FormatMode::Diff => {
+                if result.is_formatted() {
+                    Ok(ExitStatus::Failure)
+                } else {
+                    Ok(ExitStatus::Success)
+                }
+            }
+        },
+        Err(err) => {
+            error!("{err}");
+            Ok(ExitStatus::Error)
+        }
+    }
+}
+
+/// Format source code read from `stdin`.
+fn format_source_code(
+    path: Option<&Path>,
+    settings: &FormatterSettings,
+    source_type: PySourceType,
+    mode: FormatMode,
+) -> Result<FormatResult, FormatCommandError> {
+    // Read the source from stdin.
+    let source_code = read_from_stdin()
+        .map_err(|err| FormatCommandError::Read(path.map(Path::to_path_buf), err.into()))?;
+
+    let source_kind = match SourceKind::from_source_code(source_code, source_type) {
+        Ok(Some(source_kind)) => source_kind,
+        Ok(None) => return Ok(FormatResult::Unchanged),
+        Err(err) => {
+            return Err(FormatCommandError::Read(path.map(Path::to_path_buf), err));
+        }
+    };
+
+    // Format the source.
+    let formatted = format_source(&source_kind, source_type, path, settings)?;
+
+    match &formatted {
+        FormattedSource::Formatted(formatted) => match mode {
+            FormatMode::Write => {
+                let mut writer = stdout().lock();
+                formatted
+                    .write(&mut writer)
+                    .map_err(|err| FormatCommandError::Write(path.map(Path::to_path_buf), err))?;
+            }
+            FormatMode::Check => {}
+            FormatMode::Diff => {
+                source_kind
+                    .diff(formatted, path, &mut stdout().lock())
+                    .map_err(|err| FormatCommandError::Diff(path.map(Path::to_path_buf), err))?;
+            }
+        },
+        FormattedSource::Unchanged => {
+            // Write to stdout regardless of whether the source was formatted
+            if mode.is_write() {
+                let mut writer = stdout().lock();
+                source_kind
+                    .write(&mut writer)
+                    .map_err(|err| FormatCommandError::Write(path.map(Path::to_path_buf), err))?;
+            }
+        }
+    }
+
+    Ok(FormatResult::from(formatted))
+}

crates/ruff_cli/src/commands/linter.rs

@@ -0,0 +1,71 @@
+use std::fmt::Write;
+use std::io;
+use std::io::BufWriter;
+
+use anyhow::Result;
+use itertools::Itertools;
+use serde::Serialize;
+use strum::IntoEnumIterator;
+
+use ruff_linter::registry::{Linter, RuleNamespace};
+
+use crate::args::HelpFormat;
+
+#[derive(Serialize)]
+struct LinterInfo {
+    prefix: &'static str,
+    name: &'static str,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    categories: Option<Vec<LinterCategoryInfo>>,
+}
+
+#[derive(Serialize)]
+struct LinterCategoryInfo {
+    prefix: &'static str,
+    name: &'static str,
+}
+
+pub(crate) fn linter(format: HelpFormat) -> Result<()> {
+    let mut stdout = BufWriter::new(io::stdout().lock());
+    let mut output = String::new();
+
+    match format {
+        HelpFormat::Text => {
+            for linter in Linter::iter() {
+                let prefix = match linter.common_prefix() {
+                    "" => linter
+                        .upstream_categories()
+                        .unwrap()
+                        .iter()
+                        .map(|c| c.prefix)
+                        .join("/"),
+                    prefix => prefix.to_string(),
+                };
+                writeln!(output, "{:>4} {}", prefix, linter.name()).unwrap();
+            }
+        }
+
+        HelpFormat::Json => {
+            let linters: Vec<_> = Linter::iter()
+                .map(|linter_info| LinterInfo {
+                    prefix: linter_info.common_prefix(),
+                    name: linter_info.name(),
+                    categories: linter_info.upstream_categories().map(|cats| {
+                        cats.iter()
+                            .map(|c| LinterCategoryInfo {
+                                prefix: c.prefix,
+                                name: c.category,
+                            })
+                            .collect()
+                    }),
+                })
+                .collect();
+            output.push_str(&serde_json::to_string_pretty(&linters)?);
+            output.push('\n');
+        }
+    }
+
+    io::Write::write_fmt(&mut stdout, format_args!("{output}"))?;
+
+    Ok(())
+}

crates/ruff_cli/src/commands/mod.rs

@@ -0,0 +1,12 @@
+pub(crate) mod add_noqa;
+pub(crate) mod check;
+pub(crate) mod check_stdin;
+pub(crate) mod clean;
+pub(crate) mod config;
+pub(crate) mod format;
+pub(crate) mod format_stdin;
+pub(crate) mod linter;
+pub(crate) mod rule;
+pub(crate) mod show_files;
+pub(crate) mod show_settings;
+pub(crate) mod version;

crates/ruff_cli/src/commands/rule.rs

@@ -0,0 +1,118 @@
+use std::io::{self, BufWriter, Write};
+
+use anyhow::Result;
+use serde::ser::SerializeSeq;
+use serde::{Serialize, Serializer};
+use strum::IntoEnumIterator;
+
+use ruff_diagnostics::FixAvailability;
+use ruff_linter::registry::{Linter, Rule, RuleNamespace};
+
+use crate::args::HelpFormat;
+
+#[derive(Serialize)]
+struct Explanation<'a> {
+    name: &'a str,
+    code: String,
+    linter: &'a str,
+    summary: &'a str,
+    message_formats: &'a [&'a str],
+    fix: String,
+    explanation: Option<&'a str>,
+    preview: bool,
+}
+
+impl<'a> Explanation<'a> {
+    fn from_rule(rule: &'a Rule) -> Self {
+        let code = rule.noqa_code().to_string();
+        let (linter, _) = Linter::parse_code(&code).unwrap();
+        let fix = rule.fixable().to_string();
+        Self {
+            name: rule.as_ref(),
+            code,
+            linter: linter.name(),
+            summary: rule.message_formats()[0],
+            message_formats: rule.message_formats(),
+            fix,
+            explanation: rule.explanation(),
+            preview: rule.is_preview() || rule.is_nursery(),
+        }
+    }
+}
+
+fn format_rule_text(rule: Rule) -> String {
+    let mut output = String::new();
+    output.push_str(&format!("# {} ({})", rule.as_ref(), rule.noqa_code()));
+    output.push('\n');
+    output.push('\n');
+
+    let (linter, _) = Linter::parse_code(&rule.noqa_code().to_string()).unwrap();
+    output.push_str(&format!("Derived from the **{}** linter.", linter.name()));
+    output.push('\n');
+    output.push('\n');
+
+    let fix_availability = rule.fixable();
+    if matches!(
+        fix_availability,
+        FixAvailability::Always | FixAvailability::Sometimes
+    ) {
+        output.push_str(&fix_availability.to_string());
+        output.push('\n');
+        output.push('\n');
+    }
+
+    if rule.is_preview() || rule.is_nursery() {
+        output.push_str(
+            r#"This rule is in preview and is not stable. The `--preview` flag is required for use."#,
+        );
+        output.push('\n');
+        output.push('\n');
+    }
+
+    if let Some(explanation) = rule.explanation() {
+        output.push_str(explanation.trim());
+    } else {
+        output.push_str("Message formats:");
+        for format in rule.message_formats() {
+            output.push('\n');
+            output.push_str(&format!("* {format}"));
+        }
+    }
+    output
+}
+
+/// Explain a `Rule` to the user.
+pub(crate) fn rule(rule: Rule, format: HelpFormat) -> Result<()> {
+    let mut stdout = BufWriter::new(io::stdout().lock());
+    match format {
+        HelpFormat::Text => {
+            writeln!(stdout, "{}", format_rule_text(rule))?;
+        }
+        HelpFormat::Json => {
+            serde_json::to_writer_pretty(stdout, &Explanation::from_rule(&rule))?;
+        }
+    };
+    Ok(())
+}
+
+/// Explain all rules to the user.
+pub(crate) fn rules(format: HelpFormat) -> Result<()> {
+    let mut stdout = BufWriter::new(io::stdout().lock());
+    match format {
+        HelpFormat::Text => {
+            for rule in Rule::iter() {
+                writeln!(stdout, "{}", format_rule_text(rule))?;
+                writeln!(stdout)?;
+            }
+        }
+        HelpFormat::Json => {
+            let mut serializer = serde_json::Serializer::pretty(stdout);
+            let mut seq = serializer.serialize_seq(None)?;
+            for rule in Rule::iter() {
+                seq.serialize_element(&Explanation::from_rule(&rule))?;
+            }
+            seq.end()?;
+        }
+    }
+    Ok(())
+}

crates/ruff_cli/src/commands/show_files.rs

@@ -0,0 +1,38 @@
+use std::io::Write;
+use std::path::PathBuf;
+
+use anyhow::Result;
+use itertools::Itertools;
+
+use ruff_linter::warn_user_once;
+use ruff_workspace::resolver::{python_files_in_path, PyprojectConfig, ResolvedFile};
+
+use crate::args::CliOverrides;
+
+/// Show the list of files to be checked based on current settings.
+pub(crate) fn show_files(
+    files: &[PathBuf],
+    pyproject_config: &PyprojectConfig,
+    overrides: &CliOverrides,
+    writer: &mut impl Write,
+) -> Result<()> {
+    // Collect all files in the hierarchy.
+    let (paths, _resolver) = python_files_in_path(files, pyproject_config, overrides)?;
+
+    if paths.is_empty() {
+        warn_user_once!("No Python files found under the given path(s)");
+        return Ok(());
+    }
+
+    // Print the list of files.
+    for path in paths
+        .into_iter()
+        .flatten()
+        .map(ResolvedFile::into_path)
+        .sorted_unstable()
+    {
+        writeln!(writer, "{}", path.to_string_lossy())?;
+    }
+
+    Ok(())
+}

crates/ruff_cli/src/commands/show_settings.rs

@@ -0,0 +1,41 @@
+use std::io::Write;
+use std::path::PathBuf;
+
+use anyhow::{bail, Result};
+use itertools::Itertools;
+
+use ruff_workspace::resolver::{python_files_in_path, PyprojectConfig, ResolvedFile};
+
+use crate::args::CliOverrides;
+
+/// Print the user-facing configuration settings.
+pub(crate) fn show_settings(
+    files: &[PathBuf],
+    pyproject_config: &PyprojectConfig,
+    overrides: &CliOverrides,
+    writer: &mut impl Write,
+) -> Result<()> {
+    // Collect all files in the hierarchy.
+    let (paths, resolver) = python_files_in_path(files, pyproject_config, overrides)?;
+
+    // Print the list of files.
+    let Some(path) = paths
+        .into_iter()
+        .flatten()
+        .map(ResolvedFile::into_path)
+        .sorted_unstable()
+        .next()
+    else {
+        bail!("No files found under the given path");
+    };
+
+    let settings = resolver.resolve(&path, pyproject_config);
+
+    writeln!(writer, "Resolved settings for: {path:?}")?;
+    if let Some(settings_path) = pyproject_config.path.as_ref() {
+        writeln!(writer, "Settings path: {settings_path:?}")?;
+    }
+    writeln!(writer, "{settings:#?}")?;
+
+    Ok(())
+}

crates/ruff_cli/src/commands/snapshots/ruff_cli__commands__check__test__E902_E902.py.snap

@@ -0,0 +1,7 @@
+---
+source: crates/ruff_cli/src/commands/check.rs
+---
+/home/ferris/project/code.py:1:1: E902 Permission denied (os error 13)
+/home/ferris/project/notebook.ipynb:1:1: E902 Permission denied (os error 13)
+/home/ferris/project/pyproject.toml:1:1: E902 Permission denied (os error 13)
+

crates/ruff_cli/src/commands/version.rs

@@ -0,0 +1,21 @@
+use std::io::{self, BufWriter, Write};
+
+use anyhow::Result;
+
+use crate::args::HelpFormat;
+
+/// Display version information
+pub(crate) fn version(output_format: HelpFormat) -> Result<()> {
+    let mut stdout = BufWriter::new(io::stdout().lock());
+    let version_info = crate::version::version();
+
+    match output_format {
+        HelpFormat::Text => {
+            writeln!(stdout, "ruff {}", &version_info)?;
+        }
+        HelpFormat::Json => {
+            serde_json::to_writer_pretty(stdout, &version_info)?;
+        }
+    };
+    Ok(())
+}

crates/ruff_cli/src/diagnostics.rs

@@ -0,0 +1,497 @@
+#![cfg_attr(target_family = "wasm", allow(dead_code))]
+
+use std::fs::File;
+use std::io;
+use std::ops::{Add, AddAssign};
+use std::path::Path;
+
+use anyhow::{Context, Result};
+use colored::Colorize;
+use log::{debug, error, warn};
+use rustc_hash::FxHashMap;
+
+use crate::cache::{Cache, FileCacheKey, LintCacheData};
+use ruff_diagnostics::Diagnostic;
+use ruff_linter::linter::{lint_fix, lint_only, FixTable, FixerResult, LinterResult};
+use ruff_linter::logging::DisplayParseError;
+use ruff_linter::message::Message;
+use ruff_linter::pyproject_toml::lint_pyproject_toml;
+use ruff_linter::registry::AsRule;
+use ruff_linter::settings::types::{ExtensionMapping, UnsafeFixes};
+use ruff_linter::settings::{flags, LinterSettings};
+use ruff_linter::source_kind::{SourceError, SourceKind};
+use ruff_linter::{fs, IOError, SyntaxError};
+use ruff_notebook::{Notebook, NotebookError, NotebookIndex};
+use ruff_python_ast::imports::ImportMap;
+use ruff_python_ast::{PySourceType, SourceType, TomlSourceType};
+use ruff_source_file::{LineIndex, SourceCode, SourceFileBuilder};
+use ruff_text_size::{TextRange, TextSize};
+use ruff_workspace::Settings;
+
+#[derive(Debug, Default, PartialEq)]
+pub(crate) struct Diagnostics {
+    pub(crate) messages: Vec<Message>,
+    pub(crate) fixed: FixMap,
+    pub(crate) imports: ImportMap,
+    pub(crate) notebook_indexes: FxHashMap<String, NotebookIndex>,
+}
+
+impl Diagnostics {
+    pub(crate) fn new(
+        messages: Vec<Message>,
+        imports: ImportMap,
+        notebook_indexes: FxHashMap<String, NotebookIndex>,
+    ) -> Self {
+        Self {
+            messages,
+            fixed: FixMap::default(),
+            imports,
+            notebook_indexes,
+        }
+    }
+
+    /// Generate [`Diagnostics`] based on a [`SourceError`].
+    pub(crate) fn from_source_error(
+        err: &SourceError,
+        path: Option<&Path>,
+        settings: &LinterSettings,
+    ) -> Self {
+        let diagnostic = match err {
+            // IO errors.
+            SourceError::Io(_)
+            | SourceError::Notebook(NotebookError::Io(_) | NotebookError::Json(_)) => {
+                Diagnostic::new(
+                    IOError {
+                        message: err.to_string(),
+                    },
+                    TextRange::default(),
+                )
+            }
+            // Syntax errors.
+            SourceError::Notebook(
+                NotebookError::InvalidJson(_)
+                | NotebookError::InvalidSchema(_)
+                | NotebookError::InvalidFormat(_),
+            ) => Diagnostic::new(
+                SyntaxError {
+                    message: err.to_string(),
+                },
+                TextRange::default(),
+            ),
+        };
+
+        if settings.rules.enabled(diagnostic.kind.rule()) {
+            let name = path.map_or_else(|| "-".into(), Path::to_string_lossy);
+            let dummy = SourceFileBuilder::new(name, "").finish();
+            Self::new(
+                vec![Message::from_diagnostic(
+                    diagnostic,
+                    dummy,
+                    TextSize::default(),
+                )],
+                ImportMap::default(),
+                FxHashMap::default(),
+            )
+        } else {
+            match path {
+                Some(path) => {
+                    warn!(
+                        "{}{}{} {err}",
+                        "Failed to lint ".bold(),
+                        fs::relativize_path(path).bold(),
+                        ":".bold()
+                    );
+                }
+                None => {
+                    warn!("{}{} {err}", "Failed to lint".bold(), ":".bold());
+                }
+            }
+
+            Self::default()
+        }
+    }
+}
+
+impl Add for Diagnostics {
+    type Output = Diagnostics;
+
+    fn add(mut self, other: Self) -> Self::Output {
+        self += other;
+        self
+    }
+}
+
+impl AddAssign for Diagnostics {
+    fn add_assign(&mut self, other: Self) {
+        self.messages.extend(other.messages);
+        self.imports.extend(other.imports);
+        self.fixed += other.fixed;
+        self.notebook_indexes.extend(other.notebook_indexes);
+    }
+}
+
+/// A collection of fixes indexed by file path.
+#[derive(Debug, Default, PartialEq)]
+pub(crate) struct FixMap(FxHashMap<String, FixTable>);
+
+impl FixMap {
+    /// Returns `true` if there are no fixes in the map.
+    pub(crate) fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+
+    /// Returns an iterator over the fixes in the map, along with the file path.
+    pub(crate) fn iter(&self) -> impl Iterator<Item = (&String, &FixTable)> {
+        self.0.iter()
+    }
+
+    /// Returns an iterator over the fixes in the map.
+    pub(crate) fn values(&self) -> impl Iterator<Item = &FixTable> {
+        self.0.values()
+    }
+}
+
+impl FromIterator<(String, FixTable)> for FixMap {
+    fn from_iter<T: IntoIterator<Item = (String, FixTable)>>(iter: T) -> Self {
+        Self(
+            iter.into_iter()
+                .filter(|(_, fixes)| !fixes.is_empty())
+                .collect(),
+        )
+    }
+}
+
+impl AddAssign for FixMap {
+    fn add_assign(&mut self, rhs: Self) {
+        for (filename, fixed) in rhs.0 {
+            if fixed.is_empty() {
+                continue;
+            }
+            let fixed_in_file = self.0.entry(filename).or_default();
+            for (rule, count) in fixed {
+                if count > 0 {
+                    *fixed_in_file.entry(rule).or_default() += count;
+                }
+            }
+        }
+    }
+}
+
+fn override_source_type(path: Option<&Path>, extension: &ExtensionMapping) -> Option<PySourceType> {
+    let ext = path?.extension()?.to_str()?;
+    extension.get(ext).map(PySourceType::from)
+}
+
+/// Lint the source code at the given `Path`.
+pub(crate) fn lint_path(
+    path: &Path,
+    package: Option<&Path>,
+    settings: &LinterSettings,
+    cache: Option<&Cache>,
+    noqa: flags::Noqa,
+    fix_mode: flags::FixMode,
+    unsafe_fixes: UnsafeFixes,
+) -> Result<Diagnostics> {
+    // Check the cache.
+    let caching = match cache {
+        Some(cache) if noqa.into() => {
+            let relative_path = cache
+                .relative_path(path)
+                .expect("wrong package cache for file");
+
+            let cache_key = FileCacheKey::from_path(path).context("Failed to create cache key")?;
+            let cached_diagnostics = cache
+                .get(relative_path, &cache_key)
+                .and_then(|entry| entry.to_diagnostics(path));
+            if let Some(diagnostics) = cached_diagnostics {
+                // `FixMode::Generate` and `FixMode::Diff` rely on side-effects (writing to disk,
+                // and writing the diff to stdout, respectively). If a file has diagnostics, we
+                // need to avoid reading from and writing to the cache in these modes.
+                if match fix_mode {
+                    flags::FixMode::Generate => true,
+                    flags::FixMode::Apply | flags::FixMode::Diff => {
+                        diagnostics.messages.is_empty() && diagnostics.fixed.is_empty()
+                    }
+                } {
+                    return Ok(diagnostics);
+                }
+            }
+
+            // Stash the file metadata for later so when we update the cache it reflects the prerun
+            // information
+            Some((cache, relative_path, cache_key))
+        }
+        _ => None,
+    };
+
+    debug!("Checking: {}", path.display());
+
+    let source_type = match override_source_type(Some(path), &settings.extension) {
+        Some(source_type) => source_type,
+        None => match SourceType::from(path) {
+            SourceType::Toml(TomlSourceType::Pyproject) => {
+                let messages = if settings
+                    .rules
+                    .iter_enabled()
+                    .any(|rule_code| rule_code.lint_source().is_pyproject_toml())
+                {
+                    let contents = match std::fs::read_to_string(path).map_err(SourceError::from) {
+                        Ok(contents) => contents,
+                        Err(err) => {
+                            return Ok(Diagnostics::from_source_error(&err, Some(path), settings));
+                        }
+                    };
+                    let source_file =
+                        SourceFileBuilder::new(path.to_string_lossy(), contents).finish();
+                    lint_pyproject_toml(source_file, settings)
+                } else {
+                    vec![]
+                };
+                return Ok(Diagnostics {
+                    messages,
+                    ..Diagnostics::default()
+                });
+            }
+            SourceType::Toml(_) => return Ok(Diagnostics::default()),
+            SourceType::Python(source_type) => source_type,
+        },
+    };
+
+    // Extract the sources from the file.
+    let source_kind = match SourceKind::from_path(path, source_type) {
+        Ok(Some(source_kind)) => source_kind,
+        Ok(None) => return Ok(Diagnostics::default()),
+        Err(err) => {
+            return Ok(Diagnostics::from_source_error(&err, Some(path), settings));
+        }
+    };
+
+    // Lint the file.
+    let (
+        LinterResult {
+            data: (messages, imports),
+            error: parse_error,
+        },
+        fixed,
+    ) = if matches!(fix_mode, flags::FixMode::Apply | flags::FixMode::Diff) {
+        if let Ok(FixerResult {
+            result,
+            transformed,
+            fixed,
+        }) = lint_fix(
+            path,
+            package,
+            noqa,
+            unsafe_fixes,
+            settings,
+            &source_kind,
+            source_type,
+        ) {
+            if !fixed.is_empty() {
+                match fix_mode {
+                    flags::FixMode::Apply => transformed.write(&mut File::create(path)?)?,
+                    flags::FixMode::Diff => {
+                        source_kind.diff(
+                            transformed.as_ref(),
+                            Some(path),
+                            &mut io::stdout().lock(),
+                        )?;
+                    }
+                    flags::FixMode::Generate => {}
+                }
+            }
+            (result, fixed)
+        } else {
+            // If we fail to fix, lint the original source code.
+            let result = lint_only(path, package, settings, noqa, &source_kind, source_type);
+            let fixed = FxHashMap::default();
+            (result, fixed)
+        }
+    } else {
+        let result = lint_only(path, package, settings, noqa, &source_kind, source_type);
+        let fixed = FxHashMap::default();
+        (result, fixed)
+    };
+
+    let imports = imports.unwrap_or_default();
+
+    if let Some((cache, relative_path, key)) = caching {
+        // We don't cache parsing errors.
+        if parse_error.is_none() {
+            // `FixMode::Generate` and `FixMode::Diff` rely on side-effects (writing to disk,
+            // and writing the diff to stdout, respectively). If a file has diagnostics, we
+            // need to avoid reading from and writing to the cache in these modes.
+            if match fix_mode {
+                flags::FixMode::Generate => true,
+                flags::FixMode::Apply | flags::FixMode::Diff => {
+                    messages.is_empty() && fixed.is_empty()
+                }
+            } {
+                cache.update_lint(
+                    relative_path.to_owned(),
+                    &key,
+                    LintCacheData::from_messages(
+                        &messages,
+                        imports.clone(),
+                        source_kind.as_ipy_notebook().map(Notebook::index).cloned(),
+                    ),
+                );
+            }
+        }
+    }
+
+    if let Some(err) = parse_error {
+        error!(
+            "{}",
+            DisplayParseError::new(
+                err,
+                SourceCode::new(
+                    source_kind.source_code(),
+                    &LineIndex::from_source_text(source_kind.source_code())
+                ),
+                &source_kind,
+            )
+        );
+    }
+
+    let notebook_indexes = if let SourceKind::IpyNotebook(notebook) = source_kind {
+        FxHashMap::from_iter([(path.to_string_lossy().to_string(), notebook.into_index())])
+    } else {
+        FxHashMap::default()
+    };
+
+    Ok(Diagnostics {
+        messages,
+        fixed: FixMap::from_iter([(fs::relativize_path(path), fixed)]),
+        imports,
+        notebook_indexes,
+    })
+}
+
+/// Generate `Diagnostic`s from source code content derived from
+/// stdin.
+pub(crate) fn lint_stdin(
+    path: Option<&Path>,
+    package: Option<&Path>,
+    contents: String,
+    settings: &Settings,
+    noqa: flags::Noqa,
+    fix_mode: flags::FixMode,
+) -> Result<Diagnostics> {
+    // TODO(charlie): Support `pyproject.toml`.
+    let source_type = if let Some(source_type) =
+        override_source_type(path, &settings.linter.extension)
+    {
+        source_type
+    } else {
+        let SourceType::Python(source_type) = path.map(SourceType::from).unwrap_or_default() else {
+            return Ok(Diagnostics::default());
+        };
+        source_type
+    };
+
+    // Extract the sources from the file.
+    let source_kind = match SourceKind::from_source_code(contents, source_type) {
+        Ok(Some(source_kind)) => source_kind,
+        Ok(None) => return Ok(Diagnostics::default()),
+        Err(err) => {
+            return Ok(Diagnostics::from_source_error(&err, path, &settings.linter));
+        }
+    };
+
+    // Lint the inputs.
+    let (
+        LinterResult {
+            data: (messages, imports),
+            error: parse_error,
+        },
+        fixed,
+    ) = if matches!(fix_mode, flags::FixMode::Apply | flags::FixMode::Diff) {
+        if let Ok(FixerResult {
+            result,
+            transformed,
+            fixed,
+        }) = lint_fix(
+            path.unwrap_or_else(|| Path::new("-")),
+            package,
+            noqa,
+            settings.unsafe_fixes,
+            &settings.linter,
+            &source_kind,
+            source_type,
+        ) {
+            match fix_mode {
+                flags::FixMode::Apply => {
+                    // Write the contents to stdout, regardless of whether any errors were fixed.
+                    transformed.write(&mut io::stdout().lock())?;
+                }
+                flags::FixMode::Diff => {
+                    // But only write a diff if it's non-empty.
+                    if !fixed.is_empty() {
+                        source_kind.diff(transformed.as_ref(), path, &mut io::stdout().lock())?;
+                    }
+                }
+                flags::FixMode::Generate => {}
+            }
+
+            (result, fixed)
+        } else {
+            // If we fail to fix, lint the original source code.
+            let result = lint_only(
+                path.unwrap_or_else(|| Path::new("-")),
+                package,
+                &settings.linter,
+                noqa,
+                &source_kind,
+                source_type,
+            );
+            let fixed = FxHashMap::default();
+
+            // Write the contents to stdout anyway.
+            if fix_mode.is_apply() {
+                source_kind.write(&mut io::stdout().lock())?;
+            }
+
+            (result, fixed)
+        }
+    } else {
+        let result = lint_only(
+            path.unwrap_or_else(|| Path::new("-")),
+            package,
+            &settings.linter,
+            noqa,
+            &source_kind,
+            source_type,
+        );
+        let fixed = FxHashMap::default();
+        (result, fixed)
+    };
+
+    let imports = imports.unwrap_or_default();
+
+    if let Some(err) = parse_error {
+        error!(
+            "Failed to parse {}: {err}",
+            path.map_or_else(|| "-".into(), fs::relativize_path).bold()
+        );
+    }
+
+    let notebook_indexes = if let SourceKind::IpyNotebook(notebook) = source_kind {
+        FxHashMap::from_iter([(
+            path.map_or_else(|| "-".into(), |path| path.to_string_lossy().to_string()),
+            notebook.into_index(),
+        )])
+    } else {
+        FxHashMap::default()
+    };
+
+    Ok(Diagnostics {
+        messages,
+        fixed: FixMap::from_iter([(
+            fs::relativize_path(path.unwrap_or_else(|| Path::new("-"))),
+            fixed,
+        )]),
+        imports,
+        notebook_indexes,
+    })
+}

crates/ruff_cli/src/lib.rs

@@ -0,0 +1,536 @@
+#![allow(clippy::print_stdout)]
+
+use std::fs::File;
+use std::io::{self, stdout, BufWriter, Write};
+use std::path::{Path, PathBuf};
+use std::process::ExitCode;
+use std::sync::mpsc::channel;
+
+use anyhow::Result;
+use clap::CommandFactory;
+use colored::Colorize;
+use log::warn;
+use notify::{recommended_watcher, RecursiveMode, Watcher};
+
+use ruff_linter::logging::{set_up_logging, LogLevel};
+use ruff_linter::settings::flags::FixMode;
+use ruff_linter::settings::types::SerializationFormat;
+use ruff_linter::{fs, warn_user, warn_user_once};
+use ruff_workspace::Settings;
+
+use crate::args::{Args, CheckCommand, Command, FormatCommand, HelpFormat};
+use crate::printer::{Flags as PrinterFlags, Printer};
+
+pub mod args;
+mod cache;
+mod commands;
+mod diagnostics;
+mod panic;
+mod printer;
+pub mod resolve;
+mod stdin;
+mod version;
+
+#[derive(Copy, Clone)]
+pub enum ExitStatus {
+    /// Linting was successful and there were no linting errors.
+    Success,
+    /// Linting was successful but there were linting errors.
+    Failure,
+    /// Linting failed.
+    Error,
+}
+
+impl From<ExitStatus> for ExitCode {
+    fn from(status: ExitStatus) -> Self {
+        match status {
+            ExitStatus::Success => ExitCode::from(0),
+            ExitStatus::Failure => ExitCode::from(1),
+            ExitStatus::Error => ExitCode::from(2),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+enum ChangeKind {
+    Configuration,
+    SourceFile,
+}
+
+/// Return the [`ChangeKind`] based on the list of modified file paths.
+///
+/// Returns `None` if no relevant changes were detected.
+fn change_detected(paths: &[PathBuf]) -> Option<ChangeKind> {
+    // If any `.toml` files were modified, return `ChangeKind::Configuration`. Otherwise, return
+    // `ChangeKind::SourceFile` if any `.py`, `.pyi`, `.pyw`, or `.ipynb` files were modified.
+    let mut source_file = false;
+    for path in paths {
+        if let Some(suffix) = path.extension() {
+            match suffix.to_str() {
+                Some("toml") => {
+                    return Some(ChangeKind::Configuration);
+                }
+                Some("py" | "pyi" | "pyw" | "ipynb") => source_file = true,
+                _ => {}
+            }
+        }
+    }
+    if source_file {
+        return Some(ChangeKind::SourceFile);
+    }
+    None
+}
+
+/// Returns true if the command should read from standard input.
+fn is_stdin(files: &[PathBuf], stdin_filename: Option<&Path>) -> bool {
+    // If the user provided a `--stdin-filename`, always read from standard input.
+    if stdin_filename.is_some() {
+        if let Some(file) = files.iter().find(|file| file.as_path() != Path::new("-")) {
+            warn_user_once!(
+                "Ignoring file {} in favor of standard input.",
+                file.display()
+            );
+        }
+        return true;
+    }
+
+    let [file] = files else {
+        return false;
+    };
+    // If the user provided exactly `-`, read from standard input.
+    file == Path::new("-")
+}
+
+/// Get the actual value of the `format` desired from either `output_format`
+/// or `format`, and warn the user if they're using the deprecated form.
+fn resolve_help_output_format(output_format: HelpFormat, format: Option<HelpFormat>) -> HelpFormat {
+    if format.is_some() {
+        warn_user!("The `--format` argument is deprecated. Use `--output-format` instead.");
+    }
+    format.unwrap_or(output_format)
+}
+
+pub fn run(
+    Args {
+        command,
+        log_level_args,
+    }: Args,
+) -> Result<ExitStatus> {
+    {
+        let default_panic_hook = std::panic::take_hook();
+        std::panic::set_hook(Box::new(move |info| {
+            #[allow(clippy::print_stderr)]
+            {
+                eprintln!(
+                    r#"
+{}{} {} If you could open an issue at:
+
+    https://github.com/astral-sh/ruff/issues/new?title=%5BPanic%5D
+
+...quoting the executed command, along with the relevant file contents and `pyproject.toml` settings, we'd be very appreciative!
+"#,
+                    "error".red().bold(),
+                    ":".bold(),
+                    "Ruff crashed.".bold(),
+                );
+            }
+            default_panic_hook(info);
+        }));
+    }
+
+    // Enabled ANSI colors on Windows 10.
+    #[cfg(windows)]
+    assert!(colored::control::set_virtual_terminal(true).is_ok());
+
+    let log_level = LogLevel::from(&log_level_args);
+    set_up_logging(&log_level)?;
+
+    match command {
+        Command::Version { output_format } => {
+            commands::version::version(output_format)?;
+            Ok(ExitStatus::Success)
+        }
+        Command::Rule {
+            rule,
+            all,
+            format,
+            mut output_format,
+        } => {
+            output_format = resolve_help_output_format(output_format, format);
+            if all {
+                commands::rule::rules(output_format)?;
+            }
+            if let Some(rule) = rule {
+                commands::rule::rule(rule, output_format)?;
+            }
+            Ok(ExitStatus::Success)
+        }
+        Command::Config { option } => {
+            commands::config::config(option.as_deref())?;
+            Ok(ExitStatus::Success)
+        }
+        Command::Linter {
+            format,
+            mut output_format,
+        } => {
+            output_format = resolve_help_output_format(output_format, format);
+            commands::linter::linter(output_format)?;
+            Ok(ExitStatus::Success)
+        }
+        Command::Clean => {
+            commands::clean::clean(log_level)?;
+            Ok(ExitStatus::Success)
+        }
+        Command::GenerateShellCompletion { shell } => {
+            shell.generate(&mut Args::command(), &mut stdout());
+            Ok(ExitStatus::Success)
+        }
+        Command::Check(args) => check(args, log_level),
+        Command::Format(args) => format(args, log_level),
+    }
+}
+
+fn format(args: FormatCommand, log_level: LogLevel) -> Result<ExitStatus> {
+    let (cli, overrides) = args.partition();
+
+    if is_stdin(&cli.files, cli.stdin_filename.as_deref()) {
+        commands::format_stdin::format_stdin(&cli, &overrides)
+    } else {
+        commands::format::format(&cli, &overrides, log_level)
+    }
+}
+
+pub fn check(args: CheckCommand, log_level: LogLevel) -> Result<ExitStatus> {
+    let (cli, overrides) = args.partition();
+
+    // Construct the "default" settings. These are used when no `pyproject.toml`
+    // files are present, or files are injected from outside of the hierarchy.
+    let pyproject_config = resolve::resolve(
+        cli.isolated,
+        cli.config.as_deref(),
+        &overrides,
+        cli.stdin_filename.as_deref(),
+    )?;
+
+    let mut writer: Box<dyn Write> = match cli.output_file {
+        Some(path) if !cli.watch => {
+            colored::control::set_override(false);
+            let file = File::create(path)?;
+            Box::new(BufWriter::new(file))
+        }
+        _ => Box::new(BufWriter::new(io::stdout())),
+    };
+    let stderr_writer = Box::new(BufWriter::new(io::stderr()));
+
+    if cli.show_settings {
+        commands::show_settings::show_settings(
+            &cli.files,
+            &pyproject_config,
+            &overrides,
+            &mut writer,
+        )?;
+        return Ok(ExitStatus::Success);
+    }
+    if cli.show_files {
+        commands::show_files::show_files(&cli.files, &pyproject_config, &overrides, &mut writer)?;
+        return Ok(ExitStatus::Success);
+    }
+
+    // Extract options that are included in `Settings`, but only apply at the top
+    // level.
+    let Settings {
+        fix,
+        fix_only,
+        unsafe_fixes,
+        output_format,
+        show_fixes,
+        show_source,
+        ..
+    } = pyproject_config.settings;
+
+    // Fix rules are as follows:
+    // - By default, generate all fixes, but don't apply them to the filesystem.
+    // - If `--fix` or `--fix-only` is set, apply applicable fixes to the filesystem (or
+    //   print them to stdout, if we're reading from stdin).
+    // - If `--diff` or `--fix-only` are set, don't print any violations (only applicable fixes)
+    // - By default, applicable fixes only include [`Applicablility::Automatic`], but if
+    //   `--unsafe-fixes` is set, then [`Applicablility::Suggested`] fixes are included.
+
+    let fix_mode = if cli.diff {
+        FixMode::Diff
+    } else if fix || fix_only {
+        FixMode::Apply
+    } else {
+        FixMode::Generate
+    };
+
+    let cache = !cli.no_cache;
+    let noqa = !cli.ignore_noqa;
+    let mut printer_flags = PrinterFlags::empty();
+    if !(cli.diff || fix_only) {
+        printer_flags |= PrinterFlags::SHOW_VIOLATIONS;
+    }
+    if show_fixes {
+        printer_flags |= PrinterFlags::SHOW_FIX_SUMMARY;
+    }
+    if show_source {
+        printer_flags |= PrinterFlags::SHOW_SOURCE;
+    }
+    if cli.ecosystem_ci {
+        warn_user!(
+            "The formatting of fixes emitted by this option is a work-in-progress, subject to \
+            change at any time, and intended only for internal use."
+        );
+        printer_flags |= PrinterFlags::SHOW_FIX_DIFF;
+    }
+
+    #[cfg(debug_assertions)]
+    if cache {
+        // `--no-cache` doesn't respect code changes, and so is often confusing during
+        // development.
+        warn_user!("Detected debug build without --no-cache.");
+    }
+
+    if cli.add_noqa {
+        if !fix_mode.is_generate() {
+            warn_user!("--fix is incompatible with --add-noqa.");
+        }
+        let modifications =
+            commands::add_noqa::add_noqa(&cli.files, &pyproject_config, &overrides)?;
+        if modifications > 0 && log_level >= LogLevel::Default {
+            let s = if modifications == 1 { "" } else { "s" };
+            #[allow(clippy::print_stderr)]
+            {
+                eprintln!("Added {modifications} noqa directive{s}.");
+            }
+        }
+        return Ok(ExitStatus::Success);
+    }
+
+    let printer = Printer::new(
+        output_format,
+        log_level,
+        fix_mode,
+        unsafe_fixes,
+        printer_flags,
+    );
+
+    if cli.watch {
+        if output_format != SerializationFormat::Text {
+            warn_user!("`--output-format text` is always used in watch mode.");
+        }
+
+        // Configure the file watcher.
+        let (tx, rx) = channel();
+        let mut watcher = recommended_watcher(tx)?;
+        for file in &cli.files {
+            watcher.watch(file, RecursiveMode::Recursive)?;
+        }
+        if let Some(file) = pyproject_config.path.as_ref() {
+            watcher.watch(file, RecursiveMode::Recursive)?;
+        }
+
+        // Perform an initial run instantly.
+        Printer::clear_screen()?;
+        printer.write_to_user("Starting linter in watch mode...\n");
+
+        let messages = commands::check::check(
+            &cli.files,
+            &pyproject_config,
+            &overrides,
+            cache.into(),
+            noqa.into(),
+            fix_mode,
+            unsafe_fixes,
+        )?;
+        printer.write_continuously(&mut writer, &messages)?;
+
+        // In watch mode, we may need to re-resolve the configuration.
+        // TODO(charlie): Re-compute other derivative values, like the `printer`.
+        let mut pyproject_config = pyproject_config;
+
+        loop {
+            match rx.recv() {
+                Ok(event) => {
+                    let Some(change_kind) = change_detected(&event?.paths) else {
+                        continue;
+                    };
+
+                    if matches!(change_kind, ChangeKind::Configuration) {
+                        pyproject_config = resolve::resolve(
+                            cli.isolated,
+                            cli.config.as_deref(),
+                            &overrides,
+                            cli.stdin_filename.as_deref(),
+                        )?;
+                    }
+                    Printer::clear_screen()?;
+                    printer.write_to_user("File change detected...\n");
+
+                    let messages = commands::check::check(
+                        &cli.files,
+                        &pyproject_config,
+                        &overrides,
+                        cache.into(),
+                        noqa.into(),
+                        fix_mode,
+                        unsafe_fixes,
+                    )?;
+                    printer.write_continuously(&mut writer, &messages)?;
+                }
+                Err(err) => return Err(err.into()),
+            }
+        }
+    } else {
+        let is_stdin = is_stdin(&cli.files, cli.stdin_filename.as_deref());
+
+        // Generate lint violations.
+        let diagnostics = if is_stdin {
+            commands::check_stdin::check_stdin(
+                cli.stdin_filename.map(fs::normalize_path).as_deref(),
+                &pyproject_config,
+                &overrides,
+                noqa.into(),
+                fix_mode,
+            )?
+        } else {
+            commands::check::check(
+                &cli.files,
+                &pyproject_config,
+                &overrides,
+                cache.into(),
+                noqa.into(),
+                fix_mode,
+                unsafe_fixes,
+            )?
+        };
+
+        // Always try to print violations (though the printer itself may suppress output)
+        // If we're writing fixes via stdin, the transformed source code goes to the writer
+        // so send the summary to stderr instead
+        let mut summary_writer = if is_stdin && matches!(fix_mode, FixMode::Apply | FixMode::Diff) {
+            stderr_writer
+        } else {
+            writer
+        };
+        if cli.statistics {
+            printer.write_statistics(&diagnostics, &mut summary_writer)?;
+        } else {
+            printer.write_once(&diagnostics, &mut summary_writer)?;
+        }
+
+        if !cli.exit_zero {
+            if cli.diff {
+                // If we're printing a diff, we always want to exit non-zero if there are
+                // any fixable violations (since we've printed the diff, but not applied the
+                // fixes).
+                if !diagnostics.fixed.is_empty() {
+                    return Ok(ExitStatus::Failure);
+                }
+            } else if fix_only {
+                // If we're only fixing, we want to exit zero (since we've fixed all fixable
+                // violations), unless we're explicitly asked to exit non-zero on fix.
+                if cli.exit_non_zero_on_fix {
+                    if !diagnostics.fixed.is_empty() {
+                        return Ok(ExitStatus::Failure);
+                    }
+                }
+            } else {
+                // If we're running the linter (not just fixing), we want to exit non-zero if
+                // there are any violations, unless we're explicitly asked to exit zero on
+                // fix.
+                if cli.exit_non_zero_on_fix {
+                    if !diagnostics.fixed.is_empty() || !diagnostics.messages.is_empty() {
+                        return Ok(ExitStatus::Failure);
+                    }
+                } else {
+                    if !diagnostics.messages.is_empty() {
+                        return Ok(ExitStatus::Failure);
+                    }
+                }
+            }
+        }
+    }
+    Ok(ExitStatus::Success)
+}
+
+#[cfg(test)]
+mod test_file_change_detector {
+    use std::path::PathBuf;
+
+    use crate::{change_detected, ChangeKind};
+
+    #[test]
+    fn detect_correct_file_change() {
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("tmp/pyproject.toml"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("pyproject.toml"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("tmp1/tmp2/tmp3/pyproject.toml"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("tmp/ruff.toml"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("tmp/.ruff.toml"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::SourceFile),
+            change_detected(&[
+                PathBuf::from("tmp/rule.py"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::SourceFile),
+            change_detected(&[
+                PathBuf::from("tmp/rule.pyi"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("pyproject.toml"),
+                PathBuf::from("tmp/rule.py"),
+            ]),
+        );
+        assert_eq!(
+            Some(ChangeKind::Configuration),
+            change_detected(&[
+                PathBuf::from("tmp/rule.py"),
+                PathBuf::from("pyproject.toml"),
+            ]),
+        );
+        assert_eq!(
+            None,
+            change_detected(&[
+                PathBuf::from("tmp/rule.js"),
+                PathBuf::from("tmp/bin/ruff.rs"),
+            ]),
+        );
+    }
+}

crates/ruff_cli/src/panic.rs

@@ -0,0 +1,46 @@
+#[derive(Default, Debug)]
+pub(crate) struct PanicError {
+    pub(crate) info: String,
+    pub(crate) backtrace: Option<std::backtrace::Backtrace>,
+}
+
+impl std::fmt::Display for PanicError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        writeln!(f, "{}", self.info)?;
+        if let Some(backtrace) = &self.backtrace {
+            writeln!(f, "Backtrace: {backtrace}")
+        } else {
+            Ok(())
+        }
+    }
+}
+
+thread_local! {
+    static LAST_PANIC: std::cell::Cell<Option<PanicError>> = std::cell::Cell::new(None);
+}
+
+/// [`catch_unwind`](std::panic::catch_unwind) wrapper that sets a custom [`set_hook`](std::panic::set_hook)
+/// to extract the backtrace. The original panic-hook gets restored before returning.
+pub(crate) fn catch_unwind<F, R>(f: F) -> Result<R, PanicError>
+where
+    F: FnOnce() -> R + std::panic::UnwindSafe,
+{
+    let prev = std::panic::take_hook();
+    std::panic::set_hook(Box::new(|info| {
+        let info = info.to_string();
+        let backtrace = std::backtrace::Backtrace::force_capture();
+        LAST_PANIC.with(|cell| {
+            cell.set(Some(PanicError {
+                info,
+                backtrace: Some(backtrace),
+            }));
+        });
+    }));
+
+    let result = std::panic::catch_unwind(f)
+        .map_err(|_| LAST_PANIC.with(std::cell::Cell::take).unwrap_or_default());
+
+    std::panic::set_hook(prev);
+
+    result
+}

crates/ruff_cli/src/printer.rs

@@ -0,0 +1,542 @@
+use std::cmp::Reverse;
+use std::fmt::Display;
+use std::hash::Hash;
+use std::io::Write;
+
+use anyhow::Result;
+use bitflags::bitflags;
+use colored::Colorize;
+use itertools::{iterate, Itertools};
+use serde::Serialize;
+
+use ruff_linter::fs::relativize_path;
+use ruff_linter::logging::LogLevel;
+use ruff_linter::message::{
+    AzureEmitter, Emitter, EmitterContext, GithubEmitter, GitlabEmitter, GroupedEmitter,
+    JsonEmitter, JsonLinesEmitter, JunitEmitter, PylintEmitter, TextEmitter,
+};
+use ruff_linter::notify_user;
+use ruff_linter::registry::{AsRule, Rule};
+use ruff_linter::settings::flags::{self};
+use ruff_linter::settings::types::{SerializationFormat, UnsafeFixes};
+
+use crate::diagnostics::{Diagnostics, FixMap};
+
+bitflags! {
+    #[derive(Default, Debug, Copy, Clone)]
+    pub(crate) struct Flags: u8 {
+        /// Whether to show violations when emitting diagnostics.
+        const SHOW_VIOLATIONS = 0b0000_0001;
+        /// Whether to show the source code when emitting diagnostics.
+        const SHOW_SOURCE = 0b000_0010;
+        /// Whether to show a summary of the fixed violations when emitting diagnostics.
+        const SHOW_FIX_SUMMARY = 0b0000_0100;
+        /// Whether to show a diff of each fixed violation when emitting diagnostics.
+        const SHOW_FIX_DIFF = 0b0000_1000;
+    }
+}
+
+#[derive(Serialize)]
+struct ExpandedStatistics<'a> {
+    code: SerializeRuleAsCode,
+    message: &'a str,
+    count: usize,
+    fixable: bool,
+}
+
+struct SerializeRuleAsCode(Rule);
+
+impl Serialize for SerializeRuleAsCode {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(&self.0.noqa_code().to_string())
+    }
+}
+
+impl Display for SerializeRuleAsCode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0.noqa_code())
+    }
+}
+
+impl From<Rule> for SerializeRuleAsCode {
+    fn from(rule: Rule) -> Self {
+        Self(rule)
+    }
+}
+
+pub(crate) struct Printer {
+    format: SerializationFormat,
+    log_level: LogLevel,
+    fix_mode: flags::FixMode,
+    unsafe_fixes: UnsafeFixes,
+    flags: Flags,
+}
+
+impl Printer {
+    pub(crate) const fn new(
+        format: SerializationFormat,
+        log_level: LogLevel,
+        fix_mode: flags::FixMode,
+        unsafe_fixes: UnsafeFixes,
+        flags: Flags,
+    ) -> Self {
+        Self {
+            format,
+            log_level,
+            fix_mode,
+            unsafe_fixes,
+            flags,
+        }
+    }
+
+    pub(crate) fn write_to_user(&self, message: &str) {
+        if self.log_level >= LogLevel::Default {
+            notify_user!("{}", message);
+        }
+    }
+
+    fn write_summary_text(&self, writer: &mut dyn Write, diagnostics: &Diagnostics) -> Result<()> {
+        if self.log_level >= LogLevel::Default {
+            let fixables = FixableStatistics::try_from(diagnostics, self.unsafe_fixes);
+
+            let fixed = diagnostics
+                .fixed
+                .values()
+                .flat_map(std::collections::HashMap::values)
+                .sum::<usize>();
+
+            if self.flags.intersects(Flags::SHOW_VIOLATIONS) {
+                let remaining = diagnostics.messages.len();
+                let total = fixed + remaining;
+                if fixed > 0 {
+                    let s = if total == 1 { "" } else { "s" };
+                    writeln!(
+                        writer,
+                        "Found {total} error{s} ({fixed} fixed, {remaining} remaining)."
+                    )?;
+                } else if remaining > 0 {
+                    let s = if remaining == 1 { "" } else { "s" };
+                    writeln!(writer, "Found {remaining} error{s}.")?;
+                }
+
+                if let Some(fixables) = fixables {
+                    let fix_prefix = format!("[{}]", "*".cyan());
+
+                    if self.unsafe_fixes.is_enabled() {
+                        if fixables.applicable > 0 {
+                            writeln!(
+                                writer,
+                                "{fix_prefix} {} fixable with the --fix option.",
+                                fixables.applicable
+                            )?;
+                        }
+                    } else {
+                        if fixables.applicable > 0 && fixables.unapplicable_unsafe > 0 {
+                            let es = if fixables.unapplicable_unsafe == 1 {
+                                ""
+                            } else {
+                                "es"
+                            };
+                            writeln!(writer,
+                                "{fix_prefix} {} fixable with the `--fix` option ({} hidden fix{es} can be enabled with the `--unsafe-fixes` option).",
+                                fixables.applicable, fixables.unapplicable_unsafe
+                            )?;
+                        } else if fixables.applicable > 0 {
+                            // Only applicable fixes
+                            writeln!(
+                                writer,
+                                "{fix_prefix} {} fixable with the `--fix` option.",
+                                fixables.applicable,
+                            )?;
+                        } else {
+                            // Only unapplicable fixes
+                            let es = if fixables.unapplicable_unsafe == 1 {
+                                ""
+                            } else {
+                                "es"
+                            };
+                            writeln!(writer,
+                                "No fixes available ({} hidden fix{es} can be enabled with the `--unsafe-fixes` option).",
+                                fixables.unapplicable_unsafe
+                            )?;
+                        }
+                    }
+                }
+            } else {
+                // Check if there are unapplied fixes
+                let unapplied = {
+                    if let Some(fixables) = fixables {
+                        fixables.unapplicable_unsafe
+                    } else {
+                        0
+                    }
+                };
+
+                if unapplied > 0 {
+                    let es = if unapplied == 1 { "" } else { "es" };
+                    if fixed > 0 {
+                        let s = if fixed == 1 { "" } else { "s" };
+                        if self.fix_mode.is_apply() {
+                            writeln!(writer, "Fixed {fixed} error{s} ({unapplied} additional fix{es} available with `--unsafe-fixes`).")?;
+                        } else {
+                            writeln!(writer, "Would fix {fixed} error{s} ({unapplied} additional fix{es} available with `--unsafe-fixes`).")?;
+                        }
+                    } else {
+                        if self.fix_mode.is_apply() {
+                            writeln!(writer, "No errors fixed ({unapplied} fix{es} available with `--unsafe-fixes`).")?;
+                        } else {
+                            writeln!(writer, "No errors would be fixed ({unapplied} fix{es} available with `--unsafe-fixes`).")?;
+                        }
+                    }
+                } else {
+                    if fixed > 0 {
+                        let s = if fixed == 1 { "" } else { "s" };
+                        if self.fix_mode.is_apply() {
+                            writeln!(writer, "Fixed {fixed} error{s}.")?;
+                        } else {
+                            writeln!(writer, "Would fix {fixed} error{s}.")?;
+                        }
+                    }
+                }
+            }
+        }
+        Ok(())
+    }
+
+    pub(crate) fn write_once(
+        &self,
+        diagnostics: &Diagnostics,
+        writer: &mut dyn Write,
+    ) -> Result<()> {
+        if matches!(self.log_level, LogLevel::Silent) {
+            return Ok(());
+        }
+
+        if !self.flags.intersects(Flags::SHOW_VIOLATIONS) {
+            if matches!(
+                self.format,
+                SerializationFormat::Text | SerializationFormat::Grouped
+            ) {
+                if self.flags.intersects(Flags::SHOW_FIX_SUMMARY) {
+                    if !diagnostics.fixed.is_empty() {
+                        writeln!(writer)?;
+                        print_fix_summary(writer, &diagnostics.fixed)?;
+                        writeln!(writer)?;
+                    }
+                }
+                self.write_summary_text(writer, diagnostics)?;
+            }
+            return Ok(());
+        }
+
+        let context = EmitterContext::new(&diagnostics.notebook_indexes);
+        let fixables = FixableStatistics::try_from(diagnostics, self.unsafe_fixes);
+
+        match self.format {
+            SerializationFormat::Json => {
+                JsonEmitter.emit(writer, &diagnostics.messages, &context)?;
+            }
+            SerializationFormat::JsonLines => {
+                JsonLinesEmitter.emit(writer, &diagnostics.messages, &context)?;
+            }
+            SerializationFormat::Junit => {
+                JunitEmitter.emit(writer, &diagnostics.messages, &context)?;
+            }
+            SerializationFormat::Text => {
+                TextEmitter::default()
+                    .with_show_fix_status(show_fix_status(self.fix_mode, fixables.as_ref()))
+                    .with_show_fix_diff(self.flags.intersects(Flags::SHOW_FIX_DIFF))
+                    .with_show_source(self.flags.intersects(Flags::SHOW_SOURCE))
+                    .with_unsafe_fixes(self.unsafe_fixes)
+                    .emit(writer, &diagnostics.messages, &context)?;
+
+                if self.flags.intersects(Flags::SHOW_FIX_SUMMARY) {
+                    if !diagnostics.fixed.is_empty() {
+                        writeln!(writer)?;
+                        print_fix_summary(writer, &diagnostics.fixed)?;
+                        writeln!(writer)?;
+                    }
+                }
+
+                self.write_summary_text(writer, diagnostics)?;
+            }
+            SerializationFormat::Grouped => {
+                GroupedEmitter::default()
+                    .with_show_source(self.flags.intersects(Flags::SHOW_SOURCE))
+                    .with_show_fix_status(show_fix_status(self.fix_mode, fixables.as_ref()))
+                    .with_unsafe_fixes(self.unsafe_fixes)
+                    .emit(writer, &diagnostics.messages, &context)?;
+
+                if self.flags.intersects(Flags::SHOW_FIX_SUMMARY) {
+                    if !diagnostics.fixed.is_empty() {
+                        writeln!(writer)?;
+                        print_fix_summary(writer, &diagnostics.fixed)?;
+                        writeln!(writer)?;
+                    }
+                }
+                self.write_summary_text(writer, diagnostics)?;
+            }
+            SerializationFormat::Github => {
+                GithubEmitter.emit(writer, &diagnostics.messages, &context)?;
+            }
+            SerializationFormat::Gitlab => {
+                GitlabEmitter::default().emit(writer, &diagnostics.messages, &context)?;
+            }
+            SerializationFormat::Pylint => {
+                PylintEmitter.emit(writer, &diagnostics.messages, &context)?;
+            }
+            SerializationFormat::Azure => {
+                AzureEmitter.emit(writer, &diagnostics.messages, &context)?;
+            }
+        }
+
+        writer.flush()?;
+
+        Ok(())
+    }
+
+    pub(crate) fn write_statistics(
+        &self,
+        diagnostics: &Diagnostics,
+        writer: &mut dyn Write,
+    ) -> Result<()> {
+        let statistics: Vec<ExpandedStatistics> = diagnostics
+            .messages
+            .iter()
+            .map(|message| {
+                (
+                    message.kind.rule(),
+                    &message.kind.body,
+                    message.fix.is_some(),
+                )
+            })
+            .sorted()
+            .fold(vec![], |mut acc, (rule, body, fixable)| {
+                if let Some((prev_rule, _, _, count)) = acc.last_mut() {
+                    if *prev_rule == rule {
+                        *count += 1;
+                        return acc;
+                    }
+                }
+                acc.push((rule, body, fixable, 1));
+                acc
+            })
+            .iter()
+            .map(|(rule, message, fixable, count)| ExpandedStatistics {
+                code: (*rule).into(),
+                count: *count,
+                message,
+                fixable: *fixable,
+            })
+            .sorted_by_key(|statistic| Reverse(statistic.count))
+            .collect();
+
+        if statistics.is_empty() {
+            return Ok(());
+        }
+
+        match self.format {
+            SerializationFormat::Text => {
+                // Compute the maximum number of digits in the count and code, for all messages,
+                // to enable pretty-printing.
+                let count_width = num_digits(
+                    statistics
+                        .iter()
+                        .map(|statistic| statistic.count)
+                        .max()
+                        .unwrap(),
+                );
+                let code_width = statistics
+                    .iter()
+                    .map(|statistic| statistic.code.to_string().len())
+                    .max()
+                    .unwrap();
+                let any_fixable = statistics.iter().any(|statistic| statistic.fixable);
+
+                let fixable = format!("[{}] ", "*".cyan());
+                let unfixable = "[ ] ";
+
+                // By default, we mimic Flake8's `--statistics` format.
+                for statistic in statistics {
+                    writeln!(
+                        writer,
+                        "{:>count_width$}\t{:<code_width$}\t{}{}",
+                        statistic.count.to_string().bold(),
+                        statistic.code.to_string().red().bold(),
+                        if any_fixable {
+                            if statistic.fixable {
+                                &fixable
+                            } else {
+                                unfixable
+                            }
+                        } else {
+                            ""
+                        },
+                        statistic.message,
+                    )?;
+                }
+                return Ok(());
+            }
+            SerializationFormat::Json => {
+                writeln!(writer, "{}", serde_json::to_string_pretty(&statistics)?)?;
+            }
+            _ => {
+                anyhow::bail!(
+                    "Unsupported serialization format for statistics: {:?}",
+                    self.format
+                )
+            }
+        }
+
+        writer.flush()?;
+
+        Ok(())
+    }
+
+    pub(crate) fn write_continuously(
+        &self,
+        writer: &mut dyn Write,
+        diagnostics: &Diagnostics,
+    ) -> Result<()> {
+        if matches!(self.log_level, LogLevel::Silent) {
+            return Ok(());
+        }
+
+        if self.log_level >= LogLevel::Default {
+            let s = if diagnostics.messages.len() == 1 {
+                ""
+            } else {
+                "s"
+            };
+            notify_user!(
+                "Found {} error{s}. Watching for file changes.",
+                diagnostics.messages.len()
+            );
+        }
+
+        let fixables = FixableStatistics::try_from(diagnostics, self.unsafe_fixes);
+
+        if !diagnostics.messages.is_empty() {
+            if self.log_level >= LogLevel::Default {
+                writeln!(writer)?;
+            }
+
+            let context = EmitterContext::new(&diagnostics.notebook_indexes);
+            TextEmitter::default()
+                .with_show_fix_status(show_fix_status(self.fix_mode, fixables.as_ref()))
+                .with_show_source(self.flags.intersects(Flags::SHOW_SOURCE))
+                .with_unsafe_fixes(self.unsafe_fixes)
+                .emit(writer, &diagnostics.messages, &context)?;
+        }
+        writer.flush()?;
+
+        Ok(())
+    }
+
+    pub(crate) fn clear_screen() -> Result<()> {
+        #[cfg(not(target_family = "wasm"))]
+        clearscreen::clear()?;
+        Ok(())
+    }
+}
+
+fn num_digits(n: usize) -> usize {
+    iterate(n, |&n| n / 10)
+        .take_while(|&n| n > 0)
+        .count()
+        .max(1)
+}
+
+/// Return `true` if the [`Printer`] should indicate that a rule is fixable.
+fn show_fix_status(fix_mode: flags::FixMode, fixables: Option<&FixableStatistics>) -> bool {
+    // If we're in application mode, avoid indicating that a rule is fixable.
+    // If the specific violation were truly fixable, it would've been fixed in
+    // this pass! (We're occasionally unable to determine whether a specific
+    // violation is fixable without trying to fix it, so if fix is not
+    // enabled, we may inadvertently indicate that a rule is fixable.)
+    (!fix_mode.is_apply()) && fixables.is_some_and(FixableStatistics::any_applicable_fixes)
+}
+
+fn print_fix_summary(writer: &mut dyn Write, fixed: &FixMap) -> Result<()> {
+    let total = fixed
+        .values()
+        .map(|table| table.values().sum::<usize>())
+        .sum::<usize>();
+    assert!(total > 0);
+    let num_digits = num_digits(
+        *fixed
+            .values()
+            .filter_map(|table| table.values().max())
+            .max()
+            .unwrap(),
+    );
+
+    let s = if total == 1 { "" } else { "s" };
+    let label = format!("Fixed {total} error{s}:");
+    writeln!(writer, "{}", label.bold().green())?;
+
+    for (filename, table) in fixed
+        .iter()
+        .sorted_by_key(|(filename, ..)| filename.as_str())
+    {
+        writeln!(
+            writer,
+            "{} {}{}",
+            "-".cyan(),
+            relativize_path(filename).bold(),
+            ":".cyan()
+        )?;
+        for (rule, count) in table.iter().sorted_by_key(|(.., count)| Reverse(*count)) {
+            writeln!(
+                writer,
+                "    {count:>num_digits$} × {} ({})",
+                rule.noqa_code().to_string().red().bold(),
+                rule.as_ref(),
+            )?;
+        }
+    }
+    Ok(())
+}
+
+/// Statistics for [applicable][ruff_diagnostics::Applicability] fixes.
+#[derive(Debug)]
+struct FixableStatistics {
+    applicable: u32,
+    unapplicable_unsafe: u32,
+}
+
+impl FixableStatistics {
+    fn try_from(diagnostics: &Diagnostics, unsafe_fixes: UnsafeFixes) -> Option<Self> {
+        let mut applicable = 0;
+        let mut unapplicable_unsafe = 0;
+
+        for message in &diagnostics.messages {
+            if let Some(fix) = &message.fix {
+                if fix.applies(unsafe_fixes.required_applicability()) {
+                    applicable += 1;
+                } else {
+                    // Do not include unapplicable fixes at other levels that do not provide an opt-in
+                    if fix.applicability().is_unsafe() {
+                        unapplicable_unsafe += 1;
+                    }
+                }
+            }
+        }
+
+        if applicable == 0 && unapplicable_unsafe == 0 {
+            None
+        } else {
+            Some(Self {
+                applicable,
+                unapplicable_unsafe,
+            })
+        }
+    }
+
+    fn any_applicable_fixes(&self) -> bool {
+        self.applicable > 0
+    }
+}

crates/ruff_cli/src/resolve.rs

@@ -0,0 +1,101 @@
+use std::path::{Path, PathBuf};
+
+use anyhow::Result;
+use log::debug;
+use path_absolutize::path_dedot;
+
+use ruff_workspace::configuration::Configuration;
+use ruff_workspace::pyproject;
+use ruff_workspace::resolver::{
+    resolve_root_settings, ConfigurationTransformer, PyprojectConfig, PyprojectDiscoveryStrategy,
+    Relativity,
+};
+
+use crate::args::CliOverrides;
+
+/// Resolve the relevant settings strategy and defaults for the current
+/// invocation.
+pub fn resolve(
+    isolated: bool,
+    config: Option<&Path>,
+    overrides: &CliOverrides,
+    stdin_filename: Option<&Path>,
+) -> Result<PyprojectConfig> {
+    // First priority: if we're running in isolated mode, use the default settings.
+    if isolated {
+        let config = overrides.transform(Configuration::default());
+        let settings = config.into_settings(&path_dedot::CWD)?;
+        debug!("Isolated mode, not reading any pyproject.toml");
+        return Ok(PyprojectConfig::new(
+            PyprojectDiscoveryStrategy::Fixed,
+            settings,
+            None,
+        ));
+    }
+
+    // Second priority: the user specified a `pyproject.toml` file. Use that
+    // `pyproject.toml` for _all_ configuration, and resolve paths relative to the
+    // current working directory. (This matches ESLint's behavior.)
+    if let Some(pyproject) = config
+        .map(|config| config.display().to_string())
+        .map(|config| shellexpand::full(&config).map(|config| PathBuf::from(config.as_ref())))
+        .transpose()?
+    {
+        let settings = resolve_root_settings(&pyproject, Relativity::Cwd, overrides)?;
+        debug!(
+            "Using user specified pyproject.toml at {}",
+            pyproject.display()
+        );
+        return Ok(PyprojectConfig::new(
+            PyprojectDiscoveryStrategy::Fixed,
+            settings,
+            Some(pyproject),
+        ));
+    }
+
+    // Third priority: find a `pyproject.toml` file in either an ancestor of
+    // `stdin_filename` (if set) or the current working path all paths relative to
+    // that directory. (With `Strategy::Hierarchical`, we'll end up finding
+    // the "closest" `pyproject.toml` file for every Python file later on,
+    // so these act as the "default" settings.)
+    if let Some(pyproject) = pyproject::find_settings_toml(
+        stdin_filename
+            .as_ref()
+            .unwrap_or(&path_dedot::CWD.as_path()),
+    )? {
+        debug!("Using pyproject.toml (parent) at {}", pyproject.display());
+        let settings = resolve_root_settings(&pyproject, Relativity::Parent, overrides)?;
+        return Ok(PyprojectConfig::new(
+            PyprojectDiscoveryStrategy::Hierarchical,
+            settings,
+            Some(pyproject),
+        ));
+    }
+
+    // Fourth priority: find a user-specific `pyproject.toml`, but resolve all paths
+    // relative the current working directory. (With `Strategy::Hierarchical`, we'll
+    // end up the "closest" `pyproject.toml` file for every Python file later on, so
+    // these act as the "default" settings.)
+    if let Some(pyproject) = pyproject::find_user_settings_toml() {
+        debug!("Using pyproject.toml (cwd) at {}", pyproject.display());
+        let settings = resolve_root_settings(&pyproject, Relativity::Cwd, overrides)?;
+        return Ok(PyprojectConfig::new(
+            PyprojectDiscoveryStrategy::Hierarchical,
+            settings,
+            Some(pyproject),
+        ));
+    }
+
+    // Fallback: load Ruff's default settings, and resolve all paths relative to the
+    // current working directory. (With `Strategy::Hierarchical`, we'll end up the
+    // "closest" `pyproject.toml` file for every Python file later on, so these act
+    // as the "default" settings.)
+    debug!("Using Ruff default settings");
+    let config = overrides.transform(Configuration::default());
+    let settings = config.into_settings(&path_dedot::CWD)?;
+    Ok(PyprojectConfig::new(
+        PyprojectDiscoveryStrategy::Hierarchical,
+        settings,
+        None,
+    ))
+}

crates/ruff_cli/src/snapshots/ruff_cli__version__tests__version_formatting.snap

@@ -0,0 +1,5 @@
+---
+source: crates/ruff_cli/src/version.rs
+expression: version
+---
+0.0.0

crates/ruff_cli/src/snapshots/ruff_cli__version__tests__version_formatting_with_commit_info.snap

@@ -0,0 +1,5 @@
+---
+source: crates/ruff_cli/src/version.rs
+expression: version
+---
+0.0.0 (53b0f5d92 2023-10-19)