Bump ruff_dev to v0.0.103

Only track noqa directives for multi-line strings (#615 )
Fix “Code” misspelling (#614 )
2022-11-05 19:53:27 -04:00 · 2022-11-05 19:53:13 -04:00 · 2022-11-05 19:28:52 -04:00 · 2022-11-05 16:18:27 -04:00 · 2022-11-05 16:07:21 -04:00 · 2022-11-05 16:03:10 -04:00
349 changed files with 18429 additions and 3792 deletions
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,7 +14,7 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -27,7 +27,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo build --release
+      - run: cargo build --all --release

  cargo_fmt:
    name: "cargo fmt"
@@ -36,7 +36,10 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
+          components: rustfmt
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -49,7 +52,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo fmt --check
+      - run: cargo fmt --all --check

  cargo_clippy:
    name: "cargo clippy"
@@ -58,7 +61,10 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
+          components: clippy
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -71,7 +77,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo clippy -- -D warnings
+      - run: cargo clippy --all -- -D warnings

  cargo_test:
    name: "cargo test"
@@ -80,7 +86,9 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
      - uses: actions/cache@v3
        env:
          cache-name: cache-cargo
@@ -93,7 +101,7 @@ jobs:
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-
-      - run: cargo test
+      - run: cargo test --all

  maturin_build:
    name: "maturin build"
@@ -102,7 +110,9 @@ jobs:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
-          toolchain: stable
+          profile: minimal
+          toolchain: nightly-2022-11-01
+          override: true
      - uses: actions/setup-python@v4
        with:
          python-version: "3.10"
--- a/.github/workflows/flake8-to-ruff.yaml
+++ b/.github/workflows/flake8-to-ruff.yaml
@@ -0,0 +1,298 @@
+name: "[flake8-to-ruff] Release"
+
+on: workflow_dispatch
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  PACKAGE_NAME: flake8-to-ruff
+  CRATE_NAME: flake8_to_ruff
+  PYTHON_VERSION: "3.7" # to build abi3 wheels
+
+jobs:
+  macos-x86_64:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          default: true
+      - name: Build wheels - x86_64
+        uses: messense/maturin-action@v1
+        with:
+          target: x86_64
+          args: --release --out dist --sdist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel - x86_64
+        run: |
+          pip install dist/${{ env.CRATE_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: ${{ env.PYTHON_VERSION }}
+          architecture: x64
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          default: true
+      - name: Build wheels - universal2
+        uses: messense/maturin-action@v1
+        with:
+          args: --release --universal2 --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - name: Install built wheel - universal2
+        run: |
+          pip install dist/${{ env.CRATE_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: ${{ matrix.target }}
+          args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - 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
+        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: ${{ matrix.target }}
+          manylinux: auto
+          args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - 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
+        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: ${{ matrix.target }}
+          manylinux: auto
+          args: --no-default-features --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - 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: ${{ matrix.target }}
+          manylinux: musllinux_1_2
+          args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - 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: ${{ matrix.platform.target }}
+          manylinux: musllinux_1_2
+          args: --release --out dist -m ./${{ env.CRATE_NAME }}/Cargo.toml
+          maturin-version: "v0.13.0"
+      - 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:
+          maturin-version: "v0.13.0"
+          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
+        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
+    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.FLAKE8_TO_RUFF_TOKEN }}
+        run: |
+          pip install --upgrade twine
+          twine upload --skip-existing *
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -1,8 +1,6 @@
-name: Release
+name: "[ruff] Release"

 on:
-  pull_request:
-    branches: [main]
  create:
    tags:
      - v*
@@ -297,7 +295,7 @@ jobs:
      - name: Publish to PyPi
        env:
          TWINE_USERNAME: __token__
-          TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
+          TWINE_PASSWORD: ${{ secrets.RUFF_TOKEN }}
        run: |
          pip install --upgrade twine
          twine upload --skip-existing *
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,8 +1,8 @@
 repos:
  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.40
+    rev: v0.0.103
    hooks:
-      - id: lint
+      - id: ruff

  - repo: https://github.com/abravalheri/validate-pyproject
    rev: v0.10.1
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -11,7 +11,7 @@ your proposed change.

 ### Prerequisites

-ruff is written in Rust (1.63.0). You'll need to install the
+ruff is written in Rust. You'll need to install the
 [Rust toolchain](https://www.rust-lang.org/tools/install) for development.

 You'll also need [Insta](https://insta.rs/docs/) to update snapshot tests:
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,6 +37,12 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "anes"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
+
 [[package]]
 name = "annotate-snippets"
 version = "0.6.1"
@@ -368,6 +374,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c1db59621ec70f09c5e9b597b220c7a2b43611f4710dc03ceb8748637775692c"

+[[package]]
+name = "cast"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
+
 [[package]]
 name = "cc"
 version = "1.0.73"
@@ -416,6 +428,45 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"

+[[package]]
+name = "ciborium"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c137568cc60b904a7724001b35ce2630fd00d5d84805fbb608ab89509d788f"
+dependencies = [
+ "ciborium-io",
+ "ciborium-ll",
+ "serde",
+]
+
+[[package]]
+name = "ciborium-io"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "346de753af073cc87b52b2083a506b38ac176a44cfb05497b622e27be899b369"
+
+[[package]]
+name = "ciborium-ll"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "213030a2b5a4e0c0892b6652260cf6ccac84827b83a85a534e178e3906c4cf1b"
+dependencies = [
+ "ciborium-io",
+ "half",
+]
+
+[[package]]
+name = "clap"
+version = "3.2.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71655c45cb9845d3270c9d6df84ebe72b4dad3c2ba3f7023ad47c144e4e473a5"
+dependencies = [
+ "bitflags",
+ "clap_lex 0.2.4",
+ "indexmap",
+ "textwrap 0.16.0",
+]
+
 [[package]]
 name = "clap"
 version = "4.0.15"
@@ -425,7 +476,7 @@ dependencies = [
 "atty",
 "bitflags",
 "clap_derive",
- "clap_lex",
+ "clap_lex 0.3.0",
 "once_cell",
 "strsim",
 "termcolor",
@@ -444,6 +495,15 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "clap_lex"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
+dependencies = [
+ "os_str_bytes",
+]
+
 [[package]]
 name = "clap_lex"
 version = "0.3.0"
@@ -466,6 +526,15 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "codegen"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff61280aed771c3070e7dcc9e050c66f1eb1e3b96431ba66f9f74641d02fc41d"
+dependencies = [
+ "indexmap",
+]
+
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -502,6 +571,12 @@ dependencies = [
 "cache-padded",
 ]

+[[package]]
+name = "configparser"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5458d9d1a587efaf5091602c59d299696a3877a439c8f6d461a2d3cce11df87a"
+
 [[package]]
 name = "console"
 version = "0.15.2"
@@ -539,6 +614,42 @@ dependencies = [
 "cfg-if 1.0.0",
 ]

+[[package]]
+name = "criterion"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7c76e09c1aae2bc52b3d2f29e13c6572553b30c4aa1b8a49fd70de6412654cb"
+dependencies = [
+ "anes",
+ "atty",
+ "cast",
+ "ciborium",
+ "clap 3.2.23",
+ "criterion-plot",
+ "itertools",
+ "lazy_static",
+ "num-traits",
+ "oorandom",
+ "plotters",
+ "rayon",
+ "regex",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "tinytemplate",
+ "walkdir",
+]
+
+[[package]]
+name = "criterion-plot"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b50826342786a51a89e2da3a28f1c32b06e387201bc2d19791f622c673706b1"
+dependencies = [
+ "cast",
+ "itertools",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.6"
@@ -807,6 +918,21 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"

+[[package]]
+name = "flake8-to-ruff"
+version = "0.0.103-dev.0"
+dependencies = [
+ "anyhow",
+ "clap 4.0.15",
+ "configparser",
+ "once_cell",
+ "regex",
+ "ruff",
+ "serde",
+ "serde_json",
+ "toml",
+]
+
 [[package]]
 name = "flate2"
 version = "1.0.24"
@@ -1032,6 +1158,12 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "half"
+version = "1.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -1562,6 +1694,12 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e82dad04139b71a90c080c8463fe0dc7902db5192d939bd0950f074d014339e1"

+[[package]]
+name = "oorandom"
+version = "11.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
+
 [[package]]
 name = "opaque-debug"
 version = "0.2.3"
@@ -1770,6 +1908,34 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"

+[[package]]
+name = "plotters"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2538b639e642295546c50fcd545198c9d64ee2a38620a628724a3b266d5fbf97"
+dependencies = [
+ "num-traits",
+ "plotters-backend",
+ "plotters-svg",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "plotters-backend"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "193228616381fecdc1224c62e96946dfbc73ff4384fba576e052ff8c1bea8142"
+
+[[package]]
+name = "plotters-svg"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f9a81d2759aae1dae668f783c308bc5c8ebd191ff4184aaa1b37f65a6ae5a56f"
+dependencies = [
+ "plotters-backend",
+]
+
 [[package]]
 name = "polling"
 version = "2.3.0"
@@ -2043,19 +2209,30 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "ropey"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd22239fafefc42138ca5da064f3c17726a80d2379d817a3521240e78dd0064"
+dependencies = [
+ "smallvec",
+ "str_indices",
+]
+
 [[package]]
 name = "ruff"
-version = "0.0.81"
+version = "0.0.103"
 dependencies = [
 "anyhow",
 "assert_cmd",
 "bincode",
 "cacache",
 "chrono",
- "clap",
+ "clap 4.0.15",
 "clearscreen",
 "colored",
 "common-path",
+ "criterion",
 "dirs 4.0.0",
 "fern",
 "filetime",
@@ -2071,6 +2248,7 @@ dependencies = [
 "path-absolutize",
 "rayon",
 "regex",
+ "ropey",
 "rustpython-ast",
 "rustpython-common",
 "rustpython-parser",
@@ -2079,13 +2257,29 @@ dependencies = [
 "strum",
 "strum_macros",
 "test-case",
- "textwrap",
+ "textwrap 0.15.1",
 "titlecase",
 "toml",
 "update-informer",
 "walkdir",
 ]

+[[package]]
+name = "ruff_dev"
+version = "0.0.103"
+dependencies = [
+ "anyhow",
+ "clap 4.0.15",
+ "codegen",
+ "itertools",
+ "ruff",
+ "rustpython-ast",
+ "rustpython-common",
+ "rustpython-parser",
+ "strum",
+ "strum_macros",
+]
+
 [[package]]
 name = "rustls"
 version = "0.20.6"
@@ -2101,7 +2295,7 @@ dependencies = [
 [[package]]
 name = "rustpython-ast"
 version = "0.1.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "num-bigint",
 "rustpython-common",
@@ -2111,7 +2305,7 @@ dependencies = [
 [[package]]
 name = "rustpython-common"
 version = "0.0.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "ascii",
 "cfg-if 1.0.0",
@@ -2134,7 +2328,7 @@ dependencies = [
 [[package]]
 name = "rustpython-compiler-core"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "bincode",
 "bitflags",
@@ -2151,7 +2345,7 @@ dependencies = [
 [[package]]
 name = "rustpython-parser"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
+source = "git+https://github.com/RustPython/RustPython.git?rev=77b821a1941019fe34f73ce17cea013ae1b98fd0#77b821a1941019fe34f73ce17cea013ae1b98fd0"
 dependencies = [
 "ahash",
 "anyhow",
@@ -2391,6 +2585,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"

+[[package]]
+name = "str_indices"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d9199fa80c817e074620be84374a520062ebac833f358d74b37060ce4a0f2c0"
+
 [[package]]
 name = "string_cache"
 version = "0.8.4"
@@ -2539,6 +2739,12 @@ dependencies = [
 "unicode-width",
 ]

+[[package]]
+name = "textwrap"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "222a222a5bfe1bba4a77b45ec488a741b3cb8872e5e499451fd7d0129c9c7c3d"
+
 [[package]]
 name = "thiserror"
 version = "1.0.37"
@@ -2579,6 +2785,16 @@ dependencies = [
 "crunchy",
 ]

+[[package]]
+name = "tinytemplate"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4d6b5f19ff7664e8c98d03e2139cb510db9b0a60b55f8e8709b689d939b6bc"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,12 @@
+[workspace]
+members = [
+  "flake8_to_ruff",
+  "ruff_dev",
+]
+
 [package]
 name = "ruff"
-version = "0.0.81"
+version = "0.0.103"
 edition = "2021"

 [lib]
@@ -26,9 +32,10 @@ once_cell = { version = "1.13.1" }
 path-absolutize = { version = "3.0.14", features = ["once_cell_cache", "use_unix_paths_on_wasm"] }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-ast = { features = ["unparse"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
-rustpython-common = { git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
+ropey = { version = "1.5.0" }
+rustpython-ast = { features = ["unparse"], git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+rustpython-common = { git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 strum = { version = "0.24.1", features = ["strum_macros"] }
@@ -50,6 +57,7 @@ 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" }

@@ -68,3 +76,7 @@ opt-level = 3

 [profile.dev.package.similar]
 opt-level = 3
+
+[[bench]]
+name = "source_code_locator"
+harness = false
--- a/README.md
+++ b/README.md
@@ -31,6 +31,10 @@ of plugins), [`pydocstyle`](https://pypi.org/project/pydocstyle/), [`yesqa`](htt
 and even a subset of [`pyupgrade`](https://pypi.org/project/pyupgrade/) and [`autoflake`](https://pypi.org/project/autoflake/)
 all while executing tens or hundreds of times faster than any individual tool.

+Ruff is actively developed and used in major open-source projects
+like [Zulip](https://github.com/zulip/zulip), [pydantic](https://github.com/pydantic/pydantic),
+and [Saleor](https://github.com/saleor/saleor).
+
 Read the [launch blog post](https://notes.crmarsh.com/python-tooling-could-be-much-much-faster).

 ## Table of Contents
@@ -38,13 +42,25 @@ Read the [launch blog post](https://notes.crmarsh.com/python-tooling-could-be-mu
 1. [Installation and Usage](#installation-and-usage)
 2. [Configuration](#configuration)
 3. [Supported Rules](#supported-rules)
-4. [Editor Integrations](#editor-integrations)
-5. [FAQ](#faq)
-6. [Development](#development)
-7. [Releases](#releases)
-8. [Benchmarks](#benchmarks)
-9. [License](#license)
-10. [Contributing](#contributing)
+   1. [Pyflakes](#pyflakes)
+   2. [pycodestyle](#pycodestyle)
+   3. [pydocstyle](#pydocstyle)
+   4. [pyupgrade](#pyupgrade)
+   5. [pep8-naming](#pep8-naming)
+   6. [flake8-comprehensions](#flake8-comprehensions)
+   7. [flake8-bugbear](#flake8-bugbear)
+   8. [flake8-builtins](#flake8-builtins)
+   9. [flake8-print](#flake8-print)
+   10. [flake8-quotes](#flake8-quotes)
+   11. [Ruff-specific rules](#ruff-specific-rules)
+   12. [Meta rules](#meta-rules)
+5. [Editor Integrations](#editor-integrations)
+6. [FAQ](#faq)
+7. [Development](#development)
+8. [Releases](#releases)
+9. [Benchmarks](#benchmarks)
+10. [License](#license)
+11. [Contributing](#contributing)

 ## Installation and Usage

@@ -77,27 +93,84 @@ Ruff also works with [pre-commit](https://pre-commit.com):
 ```yaml
 repos:
  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.81
+    rev: v0.0.103
    hooks:
-      - id: lint
+      - id: ruff
 ```

+<!-- TODO(charlie): Remove this message a few versions after v0.0.86. -->
+_Note: prior to `v0.0.86`, `ruff-pre-commit` used `lint` (rather than `ruff`) as the hook ID._
+
 ## Configuration

-Ruff is configurable both via `pyproject.toml` and the command line.
-
-For example, you could configure Ruff to only enforce a subset of rules with:
+Ruff is configurable both via `pyproject.toml` and the command line. If left unspecified, the
+default configuration is equivalent to:

 ```toml
 [tool.ruff]
 line-length = 88
-select = [
-    "F401",
-    "F403",
+
+# Enable Flake's "E" and "F" codes by default.
+select = ["E", "F"]
+ignore = []
+
+# Exclude a variety of commonly ignored directories.
+exclude = [
+    ".bzr",
+    ".direnv",
+    ".eggs",
+    ".git",
+    ".hg",
+    ".mypy_cache",
+    ".nox",
+    ".pants.d",
+    ".ruff_cache",
+    ".svn",
+    ".tox",
+    ".venv",
+    "__pypackages__",
+    "_build",
+    "buck-out",
+    "build",
+    "dist",
+    "node_modules",
+    "venv",
 ]
+per-file-ignores = {}
+
+# Allow unused variables when underscore-prefixed.
+dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
+
+# Assume Python 3.10.
+target-version = "py310"
 ```

-Alternatively, on the command-line:
+As an example, the following would configure Ruff to (1) avoid checking for line-length
+violations (`E501`) and (2) ignore unused import rules in `__init__.py` files:
+
+```toml
+[tool.ruff]
+select = ["E", "F"]
+
+# Never enforce `E501`.
+ignore = ["E501"]
+
+# Ignore `F401` violations in any `__init__.py` file, and in `path/to/file.py`.
+per-file-ignores = {"__init__.py" = ["F401"], "path/to/file.py" = ["F401"]}
+```
+
+Plugin configurations should be expressed as subsections, e.g.:
+
+```toml
+[tool.ruff]
+# Add "Q" to the list of enabled codes.
+select = ["E", "F", "Q"]
+
+[tool.ruff.flake8-quotes]
+docstring-quotes = "double"
+```
+
+Alternatively, common configuration settings can be provided via the command-line:

 ```shell
 ruff path/to/code/ --select F401 --select F403
@@ -119,6 +192,8 @@ Options:
  -v, --verbose
          Enable verbose logging
  -q, --quiet
+          Only log errors
+  -s, --silent
          Disable all logging (but still exit with status code "1" upon detecting errors)
  -e, --exit-zero
          Exit with status code "0", even upon detecting errors
@@ -219,13 +294,19 @@ add `noqa` directives to all failing lines, with the appropriate error codes.**

 ## Supported Rules

-By default, Ruff enables all `E`, `W`, and `F` error codes, which correspond to those built-in to
-Flake8.
+Regardless of the rule's origin, Ruff re-implements every rule in Rust as a first-party feature.
+
+By default, Ruff enables all `E` and `F` error codes, which correspond to those built-in to Flake8.

 The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` command-line option.

+<!-- Sections automatically generated by examples/generate_rules_table.rs. -->
+<!-- Begin auto-generated sections. -->
+
 ### Pyflakes

+For more, see [Pyflakes](https://pypi.org/project/pyflakes/2.5.0/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | F401 | UnusedImport | `...` imported but unused | 🛠 |
@@ -246,7 +327,7 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | F634 | IfTuple | If test is a tuple, which is always `True` |  |
 | F701 | BreakOutsideLoop | `break` outside loop |  |
 | F702 | ContinueOutsideLoop | `continue` not properly in loop |  |
-| F704 | YieldOutsideFunction | `yield` or `yield from` statement outside of a function/method |  |
+| F704 | YieldOutsideFunction | `yield` or `yield from` statement outside of a function |  |
 | F706 | ReturnOutsideFunction | `return` statement outside of a function/method |  |
 | F707 | DefaultExceptNotLast | An `except:` block as not the last exception handler |  |
 | F722 | ForwardAnnotationSyntaxError | Syntax error in forward annotation: `...` |  |
@@ -255,10 +336,12 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | F823 | UndefinedLocal | Local variable `...` referenced before assignment |  |
 | F831 | DuplicateArgumentName | Duplicate argument name in function definition |  |
 | F841 | UnusedVariable | Local variable `...` is assigned to but never used |  |
-| F901 | RaiseNotImplemented | `raise NotImplemented` should be `raise NotImplementedError` |  |
+| F901 | RaiseNotImplemented | `raise NotImplemented` should be `raise NotImplementedError` | 🛠 |

 ### pycodestyle

+For more, see [pycodestyle](https://pypi.org/project/pycodestyle/2.9.1/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | E402 | ModuleImportNotAtTopOfFile | Module level import not at top of file |  |
@@ -276,9 +359,12 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | E902 | IOError | IOError: `...` |  |
 | E999 | SyntaxError | SyntaxError: `...` |  |
 | W292 | NoNewLineAtEndOfFile | No newline at end of file |  |
+| W605 | InvalidEscapeSequence | Invalid escape sequence: '\c' |  |

 ### pydocstyle

+For more, see [pydocstyle](https://pypi.org/project/pydocstyle/6.1.1/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | D100 | PublicModule | Missing docstring in public module |  |
@@ -307,13 +393,13 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | D215 | SectionUnderlineNotOverIndented | Section underline is over-indented ("Returns") | 🛠 |
 | D300 | UsesTripleQuotes | Use """triple double quotes""" |  |
 | D400 | EndsInPeriod | First line should end with a period |  |
-| D402 | NoSignature | First line should not be the function's 'signature' |  |
+| D402 | NoSignature | First line should not be the function's signature |  |
 | D403 | FirstLineCapitalized | First word of the first line should be properly capitalized |  |
-| D404 | NoThisPrefix | First word of the docstring should not be `This` |  |
+| D404 | NoThisPrefix | First word of the docstring should not be 'This' |  |
 | D405 | CapitalizeSectionName | Section name should be properly capitalized ("returns") | 🛠 |
 | D406 | NewLineAfterSectionName | Section name should end with a newline ("Returns") | 🛠 |
 | D407 | DashedUnderlineAfterSection | Missing dashed underline after section ("Returns") | 🛠 |
-| D408 | SectionUnderlineAfterName | Section underline should be in the line following the section's name ("Returns") |  |
+| D408 | SectionUnderlineAfterName | Section underline should be in the line following the section's name ("Returns") | 🛠 |
 | D409 | SectionUnderlineMatchesSectionLength | Section underline should match the length of its name ("Returns") | 🛠 |
 | D410 | BlankLineAfterSection | Missing blank line after section ("Returns") | 🛠 |
 | D411 | BlankLineBeforeSection | Missing blank line before section ("Returns") | 🛠 |
@@ -323,11 +409,13 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | D415 | EndsInPunctuation | First line should end with a period, question mark, or exclamation point |  |
 | D416 | SectionNameEndsInColon | Section name should end with a colon ("Returns") | 🛠 |
 | D417 | DocumentAllArguments | Missing argument descriptions in the docstring: `x`, `y` |  |
-| D418 | SkipDocstring | Function decorated with @overload shouldn't contain a docstring |  |
+| D418 | SkipDocstring | Function decorated with `@overload` shouldn't contain a docstring |  |
 | D419 | NonEmpty | Docstring is empty |  |

 ### pyupgrade

+For more, see [pyupgrade](https://pypi.org/project/pyupgrade/3.2.0/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | U001 | UselessMetaclassType | `__metaclass__ = type` is implied | 🛠 |
@@ -341,6 +429,8 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com

 ### pep8-naming

+For more, see [pep8-naming](https://pypi.org/project/pep8-naming/0.13.2/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | N801 | InvalidClassName | Class name `...` should use CapWords convention  |  |
@@ -348,38 +438,64 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com
 | N803 | InvalidArgumentName | Argument name `...` should be lowercase |  |
 | N804 | InvalidFirstArgumentNameForClassMethod | First argument of a class method should be named `cls` |  |
 | N805 | InvalidFirstArgumentNameForMethod | First argument of a method should be named `self` |  |
+| N806 | NonLowercaseVariableInFunction | Variable `...` in function should be lowercase |  |
+| N807 | DunderFunctionName | Function name should not start and end with `__` |  |
+| N811 | ConstantImportedAsNonConstant | Constant `...` imported as non-constant `...` |  |
+| N812 | LowercaseImportedAsNonLowercase | Lowercase `...` imported as non-lowercase `...` |  |
+| N813 | CamelcaseImportedAsLowercase | Camelcase `...` imported as lowercase `...` |  |
+| N814 | CamelcaseImportedAsConstant | Camelcase `...` imported as constant `...` |  |
+| N815 | MixedCaseVariableInClassScope | Variable `mixedCase` in class scope should not be mixedCase |  |
+| N816 | MixedCaseVariableInGlobalScope | Variable `mixedCase` in global scope should not be mixedCase |  |
+| N817 | CamelcaseImportedAsAcronym | Camelcase `...` imported as acronym `...` |  |
+| N818 | ErrorSuffixOnExceptionName | Exception name `...` should be named with an Error suffix |  |

 ### flake8-comprehensions

+For more, see [flake8-comprehensions](https://pypi.org/project/flake8-comprehensions/3.10.1/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
-| C400 | UnnecessaryGeneratorList | Unnecessary generator (rewrite as a `list` comprehension) |  |
-| C401 | UnnecessaryGeneratorSet | Unnecessary generator (rewrite as a `set` comprehension) |  |
-| C402 | UnnecessaryGeneratorDict | Unnecessary generator (rewrite as a `dict` comprehension) |  |
-| C403 | UnnecessaryListComprehensionSet | Unnecessary `list` comprehension (rewrite as a `set` comprehension) |  |
+| C400 | UnnecessaryGeneratorList | Unnecessary generator (rewrite as a `list` comprehension) | 🛠 |
+| C401 | UnnecessaryGeneratorSet | Unnecessary generator (rewrite as a `set` comprehension) | 🛠 |
+| C402 | UnnecessaryGeneratorDict | Unnecessary generator (rewrite as a `dict` comprehension) | 🛠 |
+| C403 | UnnecessaryListComprehensionSet | Unnecessary `list` comprehension (rewrite as a `set` comprehension) | 🛠 |
 | C404 | UnnecessaryListComprehensionDict | Unnecessary `list` comprehension (rewrite as a `dict` comprehension) |  |
-| C405 | UnnecessaryLiteralSet | Unnecessary `(list\|tuple)` literal (rewrite as a `set` literal) |  |
-| C406 | UnnecessaryLiteralDict | Unnecessary `(list\|tuple)` literal (rewrite as a `dict` literal) |  |
-| C408 | UnnecessaryCollectionCall | Unnecessary `(dict\|list\|tuple)` call (rewrite as a literal) |  |
-| C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary `(list\|tuple)` literal passed to `tuple()` (remove the outer call to `tuple()`) |  |
-| C410 | UnnecessaryLiteralWithinListCall | Unnecessary `(list\|tuple)` literal passed to `list()` (rewrite as a `list` literal) |  |
-| C411 | UnnecessaryListCall | Unnecessary `list` call (remove the outer call to `list()`) |  |
+| C405 | UnnecessaryLiteralSet | Unnecessary `(list\|tuple)` literal (rewrite as a `set` literal) | 🛠 |
+| C406 | UnnecessaryLiteralDict | Unnecessary `(list\|tuple)` literal (rewrite as a `dict` literal) | 🛠 |
+| C408 | UnnecessaryCollectionCall | Unnecessary `(dict\|list\|tuple)` call (rewrite as a literal) | 🛠 |
+| C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary `(list\|tuple)` literal passed to `tuple()` (remove the outer call to `tuple()`) | 🛠 |
+| C410 | UnnecessaryLiteralWithinListCall | Unnecessary `(list\|tuple)` literal passed to `list()` (rewrite as a `list` literal) | 🛠 |
+| C411 | UnnecessaryListCall | Unnecessary `list` call (remove the outer call to `list()`) | 🛠 |
 | C413 | UnnecessaryCallAroundSorted | Unnecessary `(list\|reversed)` call around `sorted()` |  |
 | C414 | UnnecessaryDoubleCastOrProcess | Unnecessary `(list\|reversed\|set\|sorted\|tuple)` call within `(list\|set\|sorted\|tuple)()` |  |
 | C415 | UnnecessarySubscriptReversal | Unnecessary subscript reversal of iterable within `(reversed\|set\|sorted)()` |  |
-| C416 | UnnecessaryComprehension |  Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) |  |
+| C416 | UnnecessaryComprehension | Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) | 🛠 |
 | C417 | UnnecessaryMap | Unnecessary `map` usage (rewrite using a `(list\|set\|dict)` comprehension) |  |

 ### flake8-bugbear

+For more, see [flake8-bugbear](https://pypi.org/project/flake8-bugbear/22.10.27/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
+| B002 | UnaryPrefixIncrement | Python does not support the unary prefix increment. |  |
+| B003 | AssignmentToOsEnviron | Assigning to `os.environ` doesn't clear the environment. |  |
+| B006 | MutableArgumentDefault | Do not use mutable data structures for argument defaults. |  |
+| B007 | UnusedLoopControlVariable | Loop control variable `i` not used within the loop body. | 🛠 |
+| B008 | FunctionCallArgumentDefault | Do not perform function calls in argument defaults. |  |
 | B011 | DoNotAssertFalse | Do not `assert False` (`python -O` removes these calls), raise `AssertionError()` | 🛠 |
+| B013 | RedundantTupleInExceptionHandler | A length-one tuple literal is redundant. Write `except ValueError:` instead of `except (ValueError,):`. |  |
 | B014 | DuplicateHandlerException | Exception handler with duplicate exception: `ValueError` | 🛠 |
+| B015 | UselessComparison | Pointless comparison. This comparison does nothing but waste CPU instructions. Either prepend `assert` or remove it. |  |
+| B016 | CannotRaiseLiteral | Cannot raise a literal. Did you intend to return it or raise an Exception? |  |
+| B017 | NoAssertRaisesException | `assertRaises(Exception):` should be considered evil. |  |
+| B018 | UselessExpression | Found useless expression. Either assign it to a variable or remove it. |  |
 | B025 | DuplicateTryBlockException | try-except block with duplicate exception `Exception` |  |

 ### flake8-builtins

+For more, see [flake8-builtins](https://pypi.org/project/flake8-builtins/2.0.1/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | A001 | BuiltinVariableShadowing | Variable `...` is shadowing a python builtin |  |
@@ -388,17 +504,39 @@ The 🛠 emoji indicates that a rule is automatically fixable by the `--fix` com

 ### flake8-print

+For more, see [flake8-print](https://pypi.org/project/flake8-print/5.0.0/) on PyPI.
+
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | T201 | PrintFound | `print` found | 🛠 |
 | T203 | PPrintFound | `pprint` found | 🛠 |

+### flake8-quotes
+
+For more, see [flake8-quotes](https://pypi.org/project/flake8-quotes/3.3.1/) on PyPI.
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| Q000 | BadQuotesInlineString | Single quotes found but double quotes preferred |  |
+| Q001 | BadQuotesMultilineString | Single quote multiline found but double quotes preferred |  |
+| Q002 | BadQuotesDocstring | Single quote docstring found but double quotes preferred |  |
+| Q003 | AvoidQuoteEscape | Change outer quotes to avoid escaping inner quotes |  |
+
+### Ruff-specific rules
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| RUF001 | AmbiguousUnicodeCharacterString | String contains ambiguous unicode character '𝐁' (did you mean 'B'?) | 🛠 |
+| RUF002 | AmbiguousUnicodeCharacterDocstring | Docstring contains ambiguous unicode character '𝐁' (did you mean 'B'?) | 🛠 |
+
 ### Meta rules

 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | M001 | UnusedNOQA | Unused `noqa` directive | 🛠 |

+<!-- End auto-generated sections. -->
+
 ## Editor Integrations

 ### PyCharm
@@ -459,14 +597,16 @@ Ruff re-implements some of the most popular Flake8 plugins and related code qual
 including:

 - [`pydocstyle`](https://pypi.org/project/pydocstyle/)
+- [`pep8-naming`](https://pypi.org/project/pep8-naming/)
 - [`yesqa`](https://github.com/asottile/yesqa)
 - [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
 - [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
 - [`flake8-super`](https://pypi.org/project/flake8-super/)
 - [`flake8-print`](https://pypi.org/project/flake8-print/)
+- [`flake8-quotes`](https://pypi.org/project/flake8-quotes/)
 - [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (3/32)
- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34)
+- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (15/32)
+- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (10/34)
 - [`autoflake`](https://pypi.org/project/autoflake/) (1/7)

 Beyond rule-set parity, Ruff suffers from the following limitations vis-à-vis Flake8:
@@ -480,15 +620,17 @@ Beyond rule-set parity, Ruff suffers from the following limitations vis-à-vis F

 Today, Ruff can be used to replace Flake8 when used with any of the following plugins:

+- [`pep8-naming`](https://pypi.org/project/pep8-naming/)
 - [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
 - [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
 - [`flake8-super`](https://pypi.org/project/flake8-super/)
 - [`flake8-print`](https://pypi.org/project/flake8-print/)
+- [`flake8-quotes`](https://pypi.org/project/flake8-quotes/)
 - [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (3/32)
+- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (15/32)

 Ruff also implements the functionality that you get from [`yesqa`](https://github.com/asottile/yesqa),
-and a subset of the rules implemented in [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34).
+and a subset of the rules implemented in [`pyupgrade`](https://pypi.org/project/pyupgrade/) (10/34).

 If you're looking to use Ruff, but rely on an unsupported Flake8 plugin, free to file an Issue.

@@ -506,7 +648,7 @@ on Rust at all.
 ### Can I write my own plugins for Ruff?

 Ruff does not yet support third-party plugins, though a plugin system is within-scope for the
-project. See [#283](https://github.com/charliermarsh/ruff/issues/2830) for more.
+project. See [#283](https://github.com/charliermarsh/ruff/issues/283) for more.

 ### Does Ruff support NumPy- or Google-style docstrings?

@@ -514,35 +656,55 @@ Yes! To enable a specific docstring convention, start by enabling all `pydocstyl
 then selectively disabling based on your [preferred convention](https://www.pydocstyle.org/en/latest/error_codes.html#default-conventions).

 For example, if you're coming from `flake8-docstrings`, the following configuration is equivalent to
-`--docstring-convention numpy`:
+`--docstring-convention=numpy`:

 ```toml
 [tool.ruff]
-extend-select = [
-    "D100",
-    "D101",
-    "D102",
-    "D103",
-    "D104",
-    "D105",
-    "D106",
-    "D200",
-    "D201",
-    "D202",
+extend-select = ["D"]
+extend-ignore = [
+    "D107",
+    "D203",
+    "D212",
+    "D213",
+    "D402",
+    "D413",
+    "D415",
+    "D416",
+    "D417",
+]
+```
+
+Similarly, the following is equivalent to `--docstring-convention=google`:
+
+```toml
+[tool.ruff]
+extend-select = ["D"]
+extend-ignore = [
+    "D203",
    "D204",
-    "D205",
-    "D206",
-    "D207",
-    "D208",
-    "D209",
-    "D210",
-    "D211",
+    "D213",
+    "D215",
+    "D400",
+    "D404",
+    "D406",
+    "D407",
+    "D408",
+    "D409",
+    "D413",
+]
+```
+
+Similarly, the following is equivalent to `--docstring-convention=pep8`:
+
+```toml
+[tool.ruff]
+extend-select = ["D"]
+extend-ignore = [
+    "D203",
+    "D212",
+    "D213",
    "D214",
    "D215",
-    "D300",
-    "D400",
-    "D402",
-    "D403",
    "D404",
    "D405",
    "D406",
@@ -551,66 +713,30 @@ extend-select = [
    "D409",
    "D410",
    "D411",
-    "D412",
    "D413",
-    "D418",
-    "D419",
-]
-```
-
-Similarly, the following is equivalent to `--docstring-convention google`:
-
-```toml
-[tool.ruff]
-extend-select = [
-    "D100",
-    "D101",
-    "D102",
-    "D103",
-    "D104",
-    "D105",
-    "D106",
-    "D107",
-    "D200",
-    "D201",
-    "D202",
-    "D205",
-    "D206",
-    "D207",
-    "D208",
-    "D209",
-    "D210",
-    "D211",
-    "D212",
-    "D214",
-    "D300",
-    "D402",
-    "D403",
-    "D405",
-    "D410",
-    "D411",
-    "D412",
-    "D414",
    "D415",
    "D416",
    "D417",
-    "D418",
-    "D419",
 ]
 ```

 ## Development

-Ruff is written in Rust (1.63.0). You'll need to install the [Rust toolchain](https://www.rust-lang.org/tools/install)
+Ruff is written in Rust (1.65.0). You'll need to install the [Rust toolchain](https://www.rust-lang.org/tools/install)
 for development.

 Assuming you have `cargo` installed, you can run:

 ```shell
 cargo run resources/test/fixtures
-cargo fmt
-cargo clippy
-cargo test
+```
+
+For development, we use [nightly Rust](https://rust-lang.github.io/rustup/concepts/channels.html#working-with-nightly-rust):
+
+```shell
+cargo +nightly fmt
+cargo +nightly clippy
+cargo +nightly test
 ```

 ## Releases
--- a/benches/source_code_locator.rs
+++ b/benches/source_code_locator.rs
@@ -0,0 +1,18 @@
+use std::path::Path;
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use ropey::Rope;
+use ruff::fs;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let contents = fs::read_file(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);
--- a/examples/generate_rules_table.rs
+++ b/examples/generate_rules_table.rs
@@ -1,29 +0,0 @@
-//! Generate a Markdown-compatible table of supported lint rules.
-
-use strum::IntoEnumIterator;
-
-use ruff::checks::{CheckCategory, CheckCode};
-
-fn main() {
-    for check_category in CheckCategory::iter() {
-        println!("### {}", check_category.title());
-        println!();
-
-        println!("| Code | Name | Message | Fix |");
-        println!("| ---- | ---- | ------- | --- |");
-        for check_code in CheckCode::iter() {
-            if check_code.category() == check_category {
-                let check_kind = check_code.kind();
-                let fix_token = if check_kind.fixable() { "🛠" } else { "" };
-                println!(
-                    "| {} | {} | {} | {} |",
-                    check_kind.code().as_ref(),
-                    check_kind.as_ref(),
-                    check_kind.body().replace("|", r"\|"),
-                    fix_token
-                );
-            }
-        }
-        println!();
-    }
-}
--- a/flake8_to_ruff/Cargo.lock
+++ b/flake8_to_ruff/Cargo.lock
--- a/flake8_to_ruff/Cargo.toml
+++ b/flake8_to_ruff/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "flake8-to-ruff"
+version = "0.0.103-dev.0"
+edition = "2021"
+
+[lib]
+name = "flake8_to_ruff"
+
+[dependencies]
+anyhow = { version = "1.0.60" }
+clap = { version = "4.0.1", features = ["derive"] }
+configparser = { version = "3.0.2" }
+once_cell = { version = "1.13.1" }
+regex = { version = "1.6.0" }
+ruff = { path = "..", default-features = false }
+serde = { version = "1.0.143", features = ["derive"] }
+serde_json = { version = "1.0.83" }
+toml = { version = "0.5.9" }
+
+[dev-dependencies]
+
+[features]
--- a/flake8_to_ruff/README.md
+++ b/flake8_to_ruff/README.md
@@ -0,0 +1,98 @@
+# flake8-to-ruff
+
+Convert existing Flake8 configuration files (`setup.cfg`, `tox.ini`, or `.flake8`) for use with
+[Ruff](https://github.com/charliermarsh/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.)
+2. Ruff will omit any error codes that are unimplemented or unsupported by Ruff, including error
+   codes from unsupported plugins. (See the [Ruff README](https://github.com/charliermarsh/ruff#user-content-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/charliermarsh/ruff/blob/main/CONTRIBUTING.md).
--- a/flake8_to_ruff/examples/poetry.ini
+++ b/flake8_to_ruff/examples/poetry.ini
@@ -0,0 +1,36 @@
+[flake8]
+min_python_version = 3.7.0
+max-line-length = 88
+ban-relative-imports = true
+# flake8-use-fstring: https://github.com/MichaelKim0407/flake8-use-fstring#--percent-greedy-and---format-greedy
+format-greedy = 1
+inline-quotes = double
+enable-extensions = TC, TC1
+type-checking-strict = true
+eradicate-whitelist-extend = ^-.*;
+extend-ignore =
+    # E203: Whitespace before ':' (pycqa/pycodestyle#373)
+    E203,
+    # SIM106: Handle error-cases first
+    SIM106,
+    # ANN101: Missing type annotation for self in method
+    ANN101,
+    # ANN102: Missing type annotation for cls in classmethod
+    ANN102,
+    # PIE781: assign-and-return
+    PIE781,
+    # PIE798 no-unnecessary-class: Consider using a module for namespacing instead
+    PIE798,
+per-file-ignores =
+    # TC002: Move third-party import '...' into a type-checking block
+    __init__.py:TC002,
+    # ANN201: Missing return type annotation for public function
+    tests/test_*:ANN201
+    tests/**/test_*:ANN201
+extend-exclude =
+    # Frozen and not subject to change in this repo:
+    get-poetry.py,
+    install-poetry.py,
+    # External to the project's coding standards:
+    tests/fixtures/*,
+    tests/**/fixtures/*,
--- a/flake8_to_ruff/examples/python-discord.ini
+++ b/flake8_to_ruff/examples/python-discord.ini
@@ -0,0 +1,19 @@
+[flake8]
+max-line-length=120
+docstring-convention=all
+import-order-style=pycharm
+application_import_names=bot,tests
+exclude=.cache,.venv,.git,constants.py
+extend-ignore=
+    B311,W503,E226,S311,T000,E731
+    # Missing Docstrings
+    D100,D104,D105,D107,
+    # Docstring Whitespace
+    D203,D212,D214,D215,
+    # Docstring Quotes
+    D301,D302,
+    # Docstring Content
+    D400,D401,D402,D404,D405,D406,D407,D408,D409,D410,D411,D412,D413,D414,D416,D417
+    # Type Annotations
+    ANN002,ANN003,ANN101,ANN102,ANN204,ANN206,ANN401
+per-file-ignores=tests/*:D,ANN
--- a/flake8_to_ruff/examples/requests.ini
+++ b/flake8_to_ruff/examples/requests.ini
@@ -0,0 +1,6 @@
+[flake8]
+ignore = E203, E501, W503
+per-file-ignores =
+    requests/__init__.py:E402, F401
+    requests/compat.py:E402, F401
+    tests/compat.py:F401
--- a/flake8_to_ruff/pyproject.toml
+++ b/flake8_to_ruff/pyproject.toml
@@ -0,0 +1,33 @@
+[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 :: 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/charliermarsh/ruff#subdirectory=crates/flake8_to_ruff"
+
+[build-system]
+requires = ["maturin>=0.13,<0.14"]
+build-backend = "maturin"
+
+[tool.maturin]
+bindings = "bin"
+strip = true
--- a/flake8_to_ruff/src/converter.rs
+++ b/flake8_to_ruff/src/converter.rs
@@ -0,0 +1,399 @@
+use std::collections::{BTreeSet, HashMap};
+
+use anyhow::Result;
+use ruff::flake8_quotes::settings::Quote;
+use ruff::settings::options::Options;
+use ruff::settings::pyproject::Pyproject;
+use ruff::{flake8_quotes, pep8_naming};
+
+use crate::plugin::Plugin;
+use crate::{parser, plugin};
+
+pub fn convert(
+    flake8: &HashMap<String, Option<String>>,
+    plugins: Option<Vec<Plugin>>,
+) -> Result<Pyproject> {
+    // 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| BTreeSet::from_iter(parser::parse_prefix_codes(value)))
+        })
+        .unwrap_or_else(|| {
+            plugin::resolve_select(
+                flake8,
+                &plugins.unwrap_or_else(|| plugin::infer_plugins(flake8)),
+            )
+        });
+    let mut ignore = flake8
+        .get("ignore")
+        .and_then(|value| {
+            value
+                .as_ref()
+                .map(|value| BTreeSet::from_iter(parser::parse_prefix_codes(value)))
+        })
+        .unwrap_or_default();
+
+    // Parse each supported option.
+    let mut options: Options = Default::default();
+    let mut flake8_quotes: flake8_quotes::settings::Options = Default::default();
+    let mut pep8_naming: pep8_naming::settings::Options = Default::default();
+    for (key, value) in flake8 {
+        if let Some(value) = value {
+            match key.as_str() {
+                // flake8
+                "max-line-length" | "max_line_length" => match value.clone().parse::<usize>() {
+                    Ok(line_length) => options.line_length = Some(line_length),
+                    Err(e) => eprintln!("Unable to parse '{key}' property: {e}"),
+                },
+                "select" => {
+                    // No-op (handled above).
+                }
+                "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) => {
+                            options.per_file_ignores =
+                                Some(parser::collect_per_file_ignores(per_file_ignores))
+                        }
+                        Err(e) => eprintln!("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::Single),
+                    _ => eprintln!("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::Single),
+                    _ => eprintln!("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::Single),
+                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                },
+                "avoid-escape" | "avoid_escape" => match value.trim() {
+                    "true" => flake8_quotes.avoid_escape = Some(true),
+                    "false" => flake8_quotes.avoid_escape = Some(false),
+                    _ => eprintln!("Unexpected '{key}' value: {value}"),
+                },
+                // 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-docstrings
+                "docstring-convention" => {
+                    // No-op (handled above).
+                }
+                // Unknown
+                _ => eprintln!("Skipping unsupported property: {key}"),
+            }
+        }
+    }
+
+    // Deduplicate and sort.
+    options.select = Some(Vec::from_iter(select));
+    options.ignore = Some(Vec::from_iter(ignore));
+    if flake8_quotes != Default::default() {
+        options.flake8_quotes = Some(flake8_quotes);
+    }
+    if pep8_naming != Default::default() {
+        options.pep8_naming = Some(pep8_naming);
+    }
+
+    // Create the pyproject.toml.
+    Ok(Pyproject::new(options))
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+
+    use anyhow::Result;
+    use ruff::checks_gen::CheckCodePrefix;
+    use ruff::flake8_quotes;
+    use ruff::settings::options::Options;
+    use ruff::settings::pyproject::Pyproject;
+
+    use crate::converter::convert;
+    use crate::plugin::Plugin;
+
+    #[test]
+    fn it_converts_empty() -> Result<()> {
+        let actual = convert(&HashMap::from([]), None)?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_dashes() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([("max-line-length".to_string(), Some("100".to_string()))]),
+            Some(vec![]),
+        )?;
+        let expected = Pyproject::new(Options {
+            line_length: Some(100),
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_underscores() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([("max_line_length".to_string(), Some("100".to_string()))]),
+            Some(vec![]),
+        )?;
+        let expected = Pyproject::new(Options {
+            line_length: Some(100),
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_ignores_parse_errors() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([("max_line_length".to_string(), Some("abc".to_string()))]),
+            Some(vec![]),
+        )?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_plugin_options() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([("inline-quotes".to_string(), Some("single".to_string()))]),
+            Some(vec![]),
+        )?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: Some(flake8_quotes::settings::Options {
+                inline_quotes: Some(flake8_quotes::settings::Quote::Single),
+                multiline_quotes: None,
+                docstring_quotes: None,
+                avoid_escape: None,
+            }),
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_converts_docstring_conventions() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([(
+                "docstring-convention".to_string(),
+                Some("numpy".to_string()),
+            )]),
+            Some(vec![Plugin::Flake8Docstrings]),
+        )?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::D100,
+                CheckCodePrefix::D101,
+                CheckCodePrefix::D102,
+                CheckCodePrefix::D103,
+                CheckCodePrefix::D104,
+                CheckCodePrefix::D105,
+                CheckCodePrefix::D106,
+                CheckCodePrefix::D200,
+                CheckCodePrefix::D201,
+                CheckCodePrefix::D202,
+                CheckCodePrefix::D204,
+                CheckCodePrefix::D205,
+                CheckCodePrefix::D206,
+                CheckCodePrefix::D207,
+                CheckCodePrefix::D208,
+                CheckCodePrefix::D209,
+                CheckCodePrefix::D210,
+                CheckCodePrefix::D211,
+                CheckCodePrefix::D214,
+                CheckCodePrefix::D215,
+                CheckCodePrefix::D300,
+                CheckCodePrefix::D400,
+                CheckCodePrefix::D403,
+                CheckCodePrefix::D404,
+                CheckCodePrefix::D405,
+                CheckCodePrefix::D406,
+                CheckCodePrefix::D407,
+                CheckCodePrefix::D408,
+                CheckCodePrefix::D409,
+                CheckCodePrefix::D410,
+                CheckCodePrefix::D411,
+                CheckCodePrefix::D412,
+                CheckCodePrefix::D414,
+                CheckCodePrefix::D418,
+                CheckCodePrefix::D419,
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: None,
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_infers_plugins_if_omitted() -> Result<()> {
+        let actual = convert(
+            &HashMap::from([("inline-quotes".to_string(), Some("single".to_string()))]),
+            None,
+        )?;
+        let expected = Pyproject::new(Options {
+            line_length: None,
+            exclude: None,
+            extend_exclude: None,
+            select: Some(vec![
+                CheckCodePrefix::E,
+                CheckCodePrefix::F,
+                CheckCodePrefix::Q,
+                CheckCodePrefix::W,
+            ]),
+            extend_select: None,
+            ignore: Some(vec![]),
+            extend_ignore: None,
+            per_file_ignores: None,
+            dummy_variable_rgx: None,
+            target_version: None,
+            flake8_quotes: Some(flake8_quotes::settings::Options {
+                inline_quotes: Some(flake8_quotes::settings::Quote::Single),
+                multiline_quotes: None,
+                docstring_quotes: None,
+                avoid_escape: None,
+            }),
+            pep8_naming: None,
+        });
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}
--- a/flake8_to_ruff/src/lib.rs
+++ b/flake8_to_ruff/src/lib.rs
@@ -0,0 +1,5 @@
+#![allow(clippy::collapsible_if, clippy::collapsible_else_if)]
+
+pub mod converter;
+mod parser;
+pub mod plugin;
--- a/flake8_to_ruff/src/main.rs
+++ b/flake8_to_ruff/src/main.rs
@@ -0,0 +1,44 @@
+//! Utility to generate Ruff's pyproject.toml section from a Flake8 INI file.
+
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::Parser;
+use configparser::ini::Ini;
+use flake8_to_ruff::converter;
+use flake8_to_ruff::plugin::Plugin;
+
+#[derive(Parser)]
+#[command(
+    about = "Convert existing Flake8 configuration to Ruff.",
+    long_about = None
+)]
+struct Cli {
+    /// Path to the Flake8 configuration file (e.g., 'setup.cfg', 'tox.ini', or
+    /// '.flake8').
+    #[arg(required = true)]
+    file: PathBuf,
+    /// List of plugins to enable.
+    #[arg(long, value_delimiter = ',')]
+    plugin: Option<Vec<Plugin>>,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    // Read the INI file.
+    let mut ini = Ini::new_cs();
+    ini.set_multiline(true);
+    let config = ini.load(cli.file).map_err(|msg| anyhow::anyhow!(msg))?;
+
+    // Extract the Flake8 section.
+    let flake8 = config
+        .get("flake8")
+        .expect("Unable to find flake8 section in INI file.");
+
+    // Create the pyproject.toml.
+    let pyproject = converter::convert(flake8, cli.plugin)?;
+    println!("{}", toml::to_string_pretty(&pyproject)?);
+
+    Ok(())
+}
--- a/flake8_to_ruff/src/parser.rs
+++ b/flake8_to_ruff/src/parser.rs
@@ -0,0 +1,373 @@
+use std::collections::BTreeMap;
+use std::str::FromStr;
+
+use anyhow::Result;
+use once_cell::sync::Lazy;
+use regex::Regex;
+use ruff::checks_gen::CheckCodePrefix;
+use ruff::settings::types::PatternPrefixPair;
+
+static COMMA_SEPARATED_LIST_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").unwrap());
+
+/// Parse a comma-separated list of `CheckCodePrefix` values (e.g.,
+/// "F401,E501").
+pub fn parse_prefix_codes(value: &str) -> Vec<CheckCodePrefix> {
+    let mut codes: Vec<CheckCodePrefix> = vec![];
+    for code in COMMA_SEPARATED_LIST_RE.split(value) {
+        let code = code.trim();
+        if code.is_empty() {
+            continue;
+        }
+        if let Ok(code) = CheckCodePrefix::from_str(code) {
+            codes.push(code);
+        } else {
+            eprintln!("Unsupported prefix code: {code}");
+        }
+    }
+    codes
+}
+
+/// Parse a comma-separated list of strings (e.g., "__init__.py,__main__.py").
+pub fn parse_strings(value: &str) -> Vec<String> {
+    COMMA_SEPARATED_LIST_RE
+        .split(value)
+        .map(|part| part.trim())
+        .filter(|part| !part.is_empty())
+        .map(String::from)
+        .collect()
+}
+
+#[derive(Debug)]
+struct Token {
+    token_name: TokenType,
+    src: String,
+}
+
+#[derive(Debug)]
+enum TokenType {
+    Code,
+    File,
+    Colon,
+    Comma,
+    Ws,
+    Eof,
+}
+
+struct State {
+    seen_sep: bool,
+    seen_colon: bool,
+    filenames: Vec<String>,
+    codes: Vec<String>,
+}
+
+impl State {
+    fn new() -> Self {
+        Self {
+            seen_sep: true,
+            seen_colon: false,
+            filenames: vec![],
+            codes: vec![],
+        }
+    }
+
+    /// Generate the list of `StrCheckCodePair` pairs for the current state.
+    fn parse(&self) -> Vec<PatternPrefixPair> {
+        let mut codes: Vec<PatternPrefixPair> = vec![];
+        for code in &self.codes {
+            match CheckCodePrefix::from_str(code) {
+                Ok(code) => {
+                    for filename in &self.filenames {
+                        codes.push(PatternPrefixPair {
+                            pattern: filename.clone(),
+                            prefix: code.clone(),
+                        });
+                    }
+                }
+                Err(_) => eprintln!("Skipping unrecognized prefix: {}", 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().to_string().trim().to_string(),
+                    });
+                    i += mat.end();
+                    break;
+                }
+            }
+        }
+    }
+    tokens.push(Token {
+        token_name: TokenType::Eof,
+        src: "".to_string(),
+    });
+    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 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 {
+                return Err(anyhow::anyhow!("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 {
+                return Err(anyhow::anyhow!("Unexpected token: {:?}", token.token_name));
+            }
+        }
+    }
+    Ok(codes)
+}
+
+/// Collect a list of `PatternPrefixPair` structs as a `BTreeMap`.
+pub fn collect_per_file_ignores(
+    pairs: Vec<PatternPrefixPair>,
+) -> BTreeMap<String, Vec<CheckCodePrefix>> {
+    let mut per_file_ignores: BTreeMap<String, Vec<CheckCodePrefix>> = BTreeMap::new();
+    for pair in pairs {
+        per_file_ignores
+            .entry(pair.pattern)
+            .or_insert_with(Vec::new)
+            .push(pair.prefix);
+    }
+    per_file_ignores
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+    use ruff::checks_gen::CheckCodePrefix;
+    use ruff::settings::types::PatternPrefixPair;
+
+    use crate::parser::{parse_files_to_codes_mapping, parse_prefix_codes, parse_strings};
+
+    #[test]
+    fn it_parses_prefix_codes() {
+        let actual = parse_prefix_codes("");
+        let expected: Vec<CheckCodePrefix> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes(" ");
+        let expected: Vec<CheckCodePrefix> = vec![];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401");
+        let expected = vec![CheckCodePrefix::F401];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401,");
+        let expected = vec![CheckCodePrefix::F401];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401,E501");
+        let expected = vec![CheckCodePrefix::F401, CheckCodePrefix::E501];
+        assert_eq!(actual, expected);
+
+        let actual = parse_prefix_codes("F401, E501");
+        let expected = vec![CheckCodePrefix::F401, CheckCodePrefix::E501];
+        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: CheckCodePrefix::F841,
+            },
+            PatternPrefixPair {
+                pattern: "examples/*".to_string(),
+                prefix: CheckCodePrefix::F841,
+            },
+        ];
+        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: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "setup.py".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "examples/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "docs/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+            PatternPrefixPair {
+                pattern: "extra/*".to_string(),
+                prefix: CheckCodePrefix::D,
+            },
+        ];
+        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: CheckCodePrefix::E402,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/core/downloader/handlers/http.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/http/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/linkextractors/__init__.py".to_string(),
+                prefix: CheckCodePrefix::E402,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/linkextractors/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/selector/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/spiders/__init__.py".to_string(),
+                prefix: CheckCodePrefix::E402,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/spiders/__init__.py".to_string(),
+                prefix: CheckCodePrefix::F401,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/utils/url.py".to_string(),
+                prefix: CheckCodePrefix::F403,
+            },
+            PatternPrefixPair {
+                pattern: "scrapy/utils/url.py".to_string(),
+                prefix: CheckCodePrefix::F405,
+            },
+            PatternPrefixPair {
+                pattern: "tests/test_loader.py".to_string(),
+                prefix: CheckCodePrefix::E741,
+            },
+        ];
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}
--- a/flake8_to_ruff/src/plugin.rs
+++ b/flake8_to_ruff/src/plugin.rs
@@ -0,0 +1,321 @@
+use std::collections::{BTreeSet, HashMap};
+use std::str::FromStr;
+
+use anyhow::anyhow;
+use ruff::checks_gen::CheckCodePrefix;
+
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq)]
+pub enum Plugin {
+    Flake8Bugbear,
+    Flake8Builtins,
+    Flake8Comprehensions,
+    Flake8Docstrings,
+    Flake8Print,
+    Flake8Quotes,
+    PEP8Naming,
+    Pyupgrade,
+}
+
+impl FromStr for Plugin {
+    type Err = anyhow::Error;
+
+    fn from_str(string: &str) -> Result<Self, Self::Err> {
+        match string {
+            "flake8-bugbear" => Ok(Plugin::Flake8Bugbear),
+            "flake8-builtins" => Ok(Plugin::Flake8Builtins),
+            "flake8-comprehensions" => Ok(Plugin::Flake8Comprehensions),
+            "flake8-docstrings" => Ok(Plugin::Flake8Docstrings),
+            "flake8-print" => Ok(Plugin::Flake8Print),
+            "flake8-quotes" => Ok(Plugin::Flake8Quotes),
+            "pep8-naming" => Ok(Plugin::PEP8Naming),
+            "pyupgrade" => Ok(Plugin::Pyupgrade),
+            _ => Err(anyhow!("Unknown plugin: {}", string)),
+        }
+    }
+}
+
+impl Plugin {
+    pub fn select(&self, flake8: &HashMap<String, Option<String>>) -> Vec<CheckCodePrefix> {
+        match self {
+            Plugin::Flake8Bugbear => vec![CheckCodePrefix::B],
+            Plugin::Flake8Builtins => vec![CheckCodePrefix::A],
+            Plugin::Flake8Comprehensions => vec![CheckCodePrefix::C],
+            Plugin::Flake8Docstrings => {
+                // Use the user-provided docstring.
+                for key in ["docstring-convention", "docstring_convention"] {
+                    if let Some(Some(value)) = flake8.get(key) {
+                        match DocstringConvention::from_str(value) {
+                            Ok(convention) => return convention.select(),
+                            Err(e) => {
+                                eprintln!("Unexpected '{key}' value: {value} ({e}");
+                                return vec![];
+                            }
+                        }
+                    }
+                }
+                // Default to PEP8.
+                DocstringConvention::PEP8.select()
+            }
+            Plugin::Flake8Print => vec![CheckCodePrefix::T],
+            Plugin::Flake8Quotes => vec![CheckCodePrefix::Q],
+            Plugin::PEP8Naming => vec![CheckCodePrefix::N],
+            Plugin::Pyupgrade => vec![CheckCodePrefix::U],
+        }
+    }
+}
+
+pub enum DocstringConvention {
+    All,
+    PEP8,
+    NumPy,
+    Google,
+}
+
+impl FromStr for DocstringConvention {
+    type Err = anyhow::Error;
+
+    fn from_str(string: &str) -> Result<Self, Self::Err> {
+        match string {
+            "all" => Ok(DocstringConvention::All),
+            "pep8" => Ok(DocstringConvention::PEP8),
+            "numpy" => Ok(DocstringConvention::NumPy),
+            "google" => Ok(DocstringConvention::Google),
+            _ => Err(anyhow!("Unknown docstring convention: {}", string)),
+        }
+    }
+}
+
+impl DocstringConvention {
+    fn select(&self) -> Vec<CheckCodePrefix> {
+        match self {
+            DocstringConvention::All => vec![CheckCodePrefix::D],
+            DocstringConvention::PEP8 => vec![
+                // All errors except D203, D212, D213, D214, D215, D404, D405, D406, D407, D408,
+                // D409, D410, D411, D413, D415, D416 and D417.
+                CheckCodePrefix::D100,
+                CheckCodePrefix::D101,
+                CheckCodePrefix::D102,
+                CheckCodePrefix::D103,
+                CheckCodePrefix::D104,
+                CheckCodePrefix::D105,
+                CheckCodePrefix::D106,
+                CheckCodePrefix::D107,
+                CheckCodePrefix::D200,
+                CheckCodePrefix::D201,
+                CheckCodePrefix::D202,
+                // CheckCodePrefix::D203,
+                CheckCodePrefix::D204,
+                CheckCodePrefix::D205,
+                CheckCodePrefix::D206,
+                CheckCodePrefix::D207,
+                CheckCodePrefix::D208,
+                CheckCodePrefix::D209,
+                CheckCodePrefix::D210,
+                CheckCodePrefix::D211,
+                // CheckCodePrefix::D212,
+                // CheckCodePrefix::D213,
+                // CheckCodePrefix::D214,
+                // CheckCodePrefix::D215,
+                CheckCodePrefix::D300,
+                CheckCodePrefix::D400,
+                CheckCodePrefix::D402,
+                CheckCodePrefix::D403,
+                // CheckCodePrefix::D404,
+                // CheckCodePrefix::D405,
+                // CheckCodePrefix::D406,
+                // CheckCodePrefix::D407,
+                // CheckCodePrefix::D408,
+                // CheckCodePrefix::D409,
+                // CheckCodePrefix::D410,
+                // CheckCodePrefix::D411,
+                CheckCodePrefix::D412,
+                // CheckCodePrefix::D413,
+                CheckCodePrefix::D414,
+                // CheckCodePrefix::D415,
+                // CheckCodePrefix::D416,
+                // CheckCodePrefix::D417,
+                CheckCodePrefix::D418,
+                CheckCodePrefix::D419,
+            ],
+            DocstringConvention::NumPy => vec![
+                // All errors except D107, D203, D212, D213, D402, D413, D415, D416, and D417.
+                CheckCodePrefix::D100,
+                CheckCodePrefix::D101,
+                CheckCodePrefix::D102,
+                CheckCodePrefix::D103,
+                CheckCodePrefix::D104,
+                CheckCodePrefix::D105,
+                CheckCodePrefix::D106,
+                // CheckCodePrefix::D107,
+                CheckCodePrefix::D200,
+                CheckCodePrefix::D201,
+                CheckCodePrefix::D202,
+                // CheckCodePrefix::D203,
+                CheckCodePrefix::D204,
+                CheckCodePrefix::D205,
+                CheckCodePrefix::D206,
+                CheckCodePrefix::D207,
+                CheckCodePrefix::D208,
+                CheckCodePrefix::D209,
+                CheckCodePrefix::D210,
+                CheckCodePrefix::D211,
+                // CheckCodePrefix::D212,
+                // CheckCodePrefix::D213,
+                CheckCodePrefix::D214,
+                CheckCodePrefix::D215,
+                CheckCodePrefix::D300,
+                CheckCodePrefix::D400,
+                // CheckCodePrefix::D402,
+                CheckCodePrefix::D403,
+                CheckCodePrefix::D404,
+                CheckCodePrefix::D405,
+                CheckCodePrefix::D406,
+                CheckCodePrefix::D407,
+                CheckCodePrefix::D408,
+                CheckCodePrefix::D409,
+                CheckCodePrefix::D410,
+                CheckCodePrefix::D411,
+                CheckCodePrefix::D412,
+                // CheckCodePrefix::D413,
+                CheckCodePrefix::D414,
+                // CheckCodePrefix::D415,
+                // CheckCodePrefix::D416,
+                // CheckCodePrefix::D417,
+                CheckCodePrefix::D418,
+                CheckCodePrefix::D419,
+            ],
+            DocstringConvention::Google => vec![
+                // All errors except D203, D204, D213, D215, D400, D401, D404, D406, D407, D408,
+                // D409 and D413.
+                CheckCodePrefix::D100,
+                CheckCodePrefix::D101,
+                CheckCodePrefix::D102,
+                CheckCodePrefix::D103,
+                CheckCodePrefix::D104,
+                CheckCodePrefix::D105,
+                CheckCodePrefix::D106,
+                CheckCodePrefix::D107,
+                CheckCodePrefix::D200,
+                CheckCodePrefix::D201,
+                CheckCodePrefix::D202,
+                // CheckCodePrefix::D203,
+                // CheckCodePrefix::D204,
+                CheckCodePrefix::D205,
+                CheckCodePrefix::D206,
+                CheckCodePrefix::D207,
+                CheckCodePrefix::D208,
+                CheckCodePrefix::D209,
+                CheckCodePrefix::D210,
+                CheckCodePrefix::D211,
+                CheckCodePrefix::D212,
+                // CheckCodePrefix::D213,
+                CheckCodePrefix::D214,
+                // CheckCodePrefix::D215,
+                CheckCodePrefix::D300,
+                // CheckCodePrefix::D400,
+                CheckCodePrefix::D402,
+                CheckCodePrefix::D403,
+                // CheckCodePrefix::D404,
+                CheckCodePrefix::D405,
+                // CheckCodePrefix::D406,
+                // CheckCodePrefix::D407,
+                // CheckCodePrefix::D408,
+                // CheckCodePrefix::D409,
+                CheckCodePrefix::D410,
+                CheckCodePrefix::D411,
+                CheckCodePrefix::D412,
+                // CheckCodePrefix::D413,
+                CheckCodePrefix::D414,
+                CheckCodePrefix::D415,
+                CheckCodePrefix::D416,
+                CheckCodePrefix::D417,
+                CheckCodePrefix::D418,
+                CheckCodePrefix::D419,
+            ],
+        }
+    }
+}
+
+/// Infer the enabled plugins based on user-provided settings.
+pub fn infer_plugins(flake8: &HashMap<String, Option<String>>) -> Vec<Plugin> {
+    let mut plugins = BTreeSet::new();
+    for key in flake8.keys() {
+        match key.as_str() {
+            // flake8-docstrings
+            "docstring-convention" | "docstring_convention" => {
+                plugins.insert(Plugin::Flake8Docstrings);
+            }
+            // flake8-builtins
+            "builtins-ignorelist" | "builtins_ignorelist" => {
+                plugins.insert(Plugin::Flake8Builtins);
+            }
+            // 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);
+            }
+            // 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);
+            }
+            _ => {}
+        }
+    }
+    Vec::from_iter(plugins)
+}
+
+/// Resolve the set of enabled `CheckCodePrefix` values for the given plugins.
+pub fn resolve_select(
+    flake8: &HashMap<String, Option<String>>,
+    plugins: &[Plugin],
+) -> BTreeSet<CheckCodePrefix> {
+    // Include default Pyflakes and pycodestyle checks.
+    let mut select = BTreeSet::from([CheckCodePrefix::E, CheckCodePrefix::F, CheckCodePrefix::W]);
+
+    // Add prefix codes for every plugin.
+    for plugin in plugins {
+        for prefix in plugin.select(flake8) {
+            select.insert(prefix);
+        }
+    }
+
+    select
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashMap;
+
+    use crate::plugin::{infer_plugins, Plugin};
+
+    #[test]
+    fn it_infers_plugins() {
+        let actual = infer_plugins(&HashMap::from([(
+            "inline-quotes".to_string(),
+            Some("single".to_string()),
+        )]));
+        let expected = vec![Plugin::Flake8Quotes];
+        assert_eq!(actual, expected);
+
+        let actual = infer_plugins(&HashMap::from([(
+            "staticmethod-decorators".to_string(),
+            Some("[]".to_string()),
+        )]));
+        let expected = vec![Plugin::PEP8Naming];
+        assert_eq!(actual, expected);
+    }
+}
--- a/resources/test/fixtures/B002.py
+++ b/resources/test/fixtures/B002.py
@@ -0,0 +1,20 @@
+"""
+Should emit:
+B002 - on lines 15 and 20
+"""
+
+
+def this_is_all_fine(n):
+    x = n + 1
+    y = 1 + n
+    z = +x + y
+    return +z
+
+
+def this_is_buggy(n):
+    x = ++n
+    return x
+
+
+def this_is_buggy_too(n):
+    return ++n
--- a/resources/test/fixtures/B003.py
+++ b/resources/test/fixtures/B003.py
@@ -0,0 +1,18 @@
+"""
+Should emit:
+B003 - on line 9
+"""
+
+import os
+from os import environ
+
+os.environ = {}
+environ = {}  # that's fine, assigning a new meaning to the module-level name
+
+
+class Object:
+    os = None
+
+
+o = Object()
+o.os.environ = {}
--- a/resources/test/fixtures/B006_B008.py
+++ b/resources/test/fixtures/B006_B008.py
@@ -0,0 +1,187 @@
+import collections
+import datetime as dt
+import logging
+import operator
+import random
+import re
+import time
+import types
+from operator import attrgetter, itemgetter, methodcaller
+from types import MappingProxyType
+
+
+# B006
+# Allow immutable literals/calls/comprehensions
+def this_is_okay(value=(1, 2, 3)):
+    ...
+
+
+async def and_this_also(value=tuple()):
+    pass
+
+
+def frozenset_also_okay(value=frozenset()):
+    pass
+
+
+def mappingproxytype_okay(
+    value=MappingProxyType({}), value2=types.MappingProxyType({})
+):
+    pass
+
+
+def re_compile_ok(value=re.compile("foo")):
+    pass
+
+
+def operators_ok(
+    v=operator.attrgetter("foo"),
+    v2=operator.itemgetter("foo"),
+    v3=operator.methodcaller("foo"),
+):
+    pass
+
+
+def operators_ok_unqualified(
+    v=attrgetter("foo"),
+    v2=itemgetter("foo"),
+    v3=methodcaller("foo"),
+):
+    pass
+
+
+def kwonlyargs_immutable(*, value=()):
+    ...
+
+
+# Flag mutable literals/comprehensions
+
+
+def this_is_wrong(value=[1, 2, 3]):
+    ...
+
+
+def this_is_also_wrong(value={}):
+    ...
+
+
+def and_this(value=set()):
+    ...
+
+
+def this_too(value=collections.OrderedDict()):
+    ...
+
+
+async def async_this_too(value=collections.defaultdict()):
+    ...
+
+
+def dont_forget_me(value=collections.deque()):
+    ...
+
+
+# N.B. we're also flagging the function call in the comprehension
+def list_comprehension_also_not_okay(default=[i**2 for i in range(3)]):
+    pass
+
+
+def dict_comprehension_also_not_okay(default={i: i**2 for i in range(3)}):
+    pass
+
+
+def set_comprehension_also_not_okay(default={i**2 for i in range(3)}):
+    pass
+
+
+def kwonlyargs_mutable(*, value=[]):
+    ...
+
+
+# Recommended approach for mutable defaults
+def do_this_instead(value=None):
+    if value is None:
+        value = set()
+
+
+# B008
+# Flag function calls as default args (including if they are part of a sub-expression)
+def in_fact_all_calls_are_wrong(value=time.time()):
+    ...
+
+
+def f(when=dt.datetime.now() + dt.timedelta(days=7)):
+    pass
+
+
+def can_even_catch_lambdas(a=(lambda x: x)()):
+    ...
+
+
+# Recommended approach for function calls as default args
+LOGGER = logging.getLogger(__name__)
+
+
+def do_this_instead_of_calls_in_defaults(logger=LOGGER):
+    # That makes it more obvious that this one value is reused.
+    ...
+
+
+# Handle inf/infinity/nan special case
+def float_inf_okay(value=float("inf")):
+    pass
+
+
+def float_infinity_okay(value=float("infinity")):
+    pass
+
+
+def float_plus_infinity_okay(value=float("+infinity")):
+    pass
+
+
+def float_minus_inf_okay(value=float("-inf")):
+    pass
+
+
+def float_nan_okay(value=float("nan")):
+    pass
+
+
+def float_minus_NaN_okay(value=float("-NaN")):
+    pass
+
+
+def float_infinity_literal(value=float("1e999")):
+    pass
+
+
+# But don't allow standard floats
+def float_int_is_wrong(value=float(3)):
+    pass
+
+
+def float_str_not_inf_or_nan_is_wrong(value=float("3.14")):
+    pass
+
+
+# B006 and B008
+# We should handle arbitrary nesting of these B008.
+def nested_combo(a=[float(3), dt.datetime.now()]):
+    pass
+
+
+# Don't flag nested B006 since we can't guarantee that
+# it isn't made mutable by the outer operation.
+def no_nested_b006(a=map(lambda s: s.upper(), ["a", "b", "c"])):
+    pass
+
+
+# B008-ception.
+def nested_b008(a=random.randint(0, dt.datetime.now().year)):
+    pass
+
+
+# Ignore lambda contents since they are evaluated at call time.
+def foo(f=lambda x: print(x)):
+    f(1)
--- a/resources/test/fixtures/B007.py
+++ b/resources/test/fixtures/B007.py
@@ -0,0 +1,31 @@
+for i in range(10):
+    print(i)
+
+print(i)  # name no longer defined on Python 3; no warning yet
+
+for i in range(10):  # name not used within the loop; B007
+    print(10)
+
+print(i)  # name no longer defined on Python 3; no warning yet
+
+
+for _ in range(10):  # _ is okay for a throw-away variable
+    print(10)
+
+
+for i in range(10):
+    for j in range(10):
+        for k in range(10):  # k not used, i and j used transitively
+            print(i + j)
+
+
+def strange_generator():
+    for i in range(10):
+        for j in range(10):
+            for k in range(10):
+                for l in range(10):
+                    yield i, (j, (k, l))
+
+
+for i, (j, (k, l)) in strange_generator():  # i, k not used
+    print(j, l)
--- a/resources/test/fixtures/B013.py
+++ b/resources/test/fixtures/B013.py
@@ -0,0 +1,8 @@
+try:
+    pass
+except (ValueError,):
+    pass
+except AttributeError:
+    pass
+except (ImportError, TypeError):
+    pass
--- a/resources/test/fixtures/B015.py
+++ b/resources/test/fixtures/B015.py
@@ -0,0 +1,24 @@
+assert 1 == 1
+
+1 == 1
+
+assert 1 in (1, 2)
+
+1 in (1, 2)
+
+
+if 1 == 2:
+    pass
+
+
+def test():
+    assert 1 in (1, 2)
+
+    1 in (1, 2)
+
+
+data = [x for x in [1, 2, 3] if x in (1, 2)]
+
+
+class TestClass:
+    1 == 1
--- a/resources/test/fixtures/B016.py
+++ b/resources/test/fixtures/B016.py
@@ -0,0 +1,11 @@
+"""
+Should emit:
+B016 - on lines 6, 7, and 8
+"""
+
+raise False
+raise 1
+raise "string"
+raise Exception(False)
+raise Exception(1)
+raise Exception("string")
--- a/resources/test/fixtures/B017.py
+++ b/resources/test/fixtures/B017.py
@@ -0,0 +1,36 @@
+"""
+Should emit:
+B017 - on lines 20
+"""
+import asyncio
+import unittest
+
+CONSTANT = True
+
+
+def something_else() -> None:
+    for i in (1, 2, 3):
+        print(i)
+
+
+class Foo:
+    pass
+
+
+class Foobar(unittest.TestCase):
+    def evil_raises(self) -> None:
+        with self.assertRaises(Exception):
+            raise Exception("Evil I say!")
+
+    def context_manager_raises(self) -> None:
+        with self.assertRaises(Exception) as ex:
+            raise Exception("Context manager is good")
+        self.assertEqual("Context manager is good", str(ex.exception))
+
+    def regex_raises(self) -> None:
+        with self.assertRaisesRegex(Exception, "Regex is good"):
+            raise Exception("Regex is good")
+
+    def raises_with_absolute_reference(self):
+        with self.assertRaises(asyncio.CancelledError):
+            Foo()
--- a/resources/test/fixtures/B018.py
+++ b/resources/test/fixtures/B018.py
@@ -0,0 +1,59 @@
+class Foo1:
+    """abc"""
+
+
+class Foo2:
+    """abc"""
+
+    a = 2
+    "str"  # Str (no raise)
+    f"{int}"  # JoinedStr (no raise)
+    1j  # Number (complex)
+    1  # Number (int)
+    1.0  # Number (float)
+    b"foo"  # Binary
+    True  # NameConstant (True)
+    False  # NameConstant (False)
+    None  # NameConstant (None)
+    [1, 2]  # list
+    {1, 2}  # set
+    {"foo": "bar"}  # dict
+
+
+class Foo3:
+    123
+    a = 2
+    "str"
+    1
+
+
+def foo1():
+    """my docstring"""
+
+
+def foo2():
+    """my docstring"""
+    a = 2
+    "str"  # Str (no raise)
+    f"{int}"  # JoinedStr (no raise)
+    1j  # Number (complex)
+    1  # Number (int)
+    1.0  # Number (float)
+    b"foo"  # Binary
+    True  # NameConstant (True)
+    False  # NameConstant (False)
+    None  # NameConstant (None)
+    [1, 2]  # list
+    {1, 2}  # set
+    {"foo": "bar"}  # dict
+
+
+def foo3():
+    123
+    a = 2
+    "str"
+    3
+
+
+def foo4():
+    ...
--- a/resources/test/fixtures/C400.py
+++ b/resources/test/fixtures/C400.py
@@ -1 +1,4 @@
 x = list(x for x in range(3))
+x = list(
+    x for x in range(3)
+)
--- a/resources/test/fixtures/C401.py
+++ b/resources/test/fixtures/C401.py
@@ -1 +1,4 @@
 x = set(x for x in range(3))
+x = set(
+    x for x in range(3)
+)
--- a/resources/test/fixtures/C402.py
+++ b/resources/test/fixtures/C402.py
@@ -1 +1,5 @@
-d = dict((x, x) for x in range(3))
+dict((x, x) for x in range(3))
+dict(
+    (x, x) for x in range(3)
+)
+dict(((x, x) for x in range(3)), z=3)
--- a/resources/test/fixtures/C403.py
+++ b/resources/test/fixtures/C403.py
@@ -1 +1,4 @@
 s = set([x for x in range(3)])
+s = set(
+    [x for x in range(3)]
+)
--- a/resources/test/fixtures/C404.py
+++ b/resources/test/fixtures/C404.py
@@ -1 +1,2 @@
-d = dict([(i, i) for i in range(3)])
+dict([(i, i) for i in range(3)])
+dict([(i, i) for i in range(3)], z=4)
--- a/resources/test/fixtures/C409.py
+++ b/resources/test/fixtures/C409.py
@@ -1,3 +1,10 @@
-t1 = tuple([1, 2])
-t2 = tuple((1, 2))
-t3 = tuple([])
+t1 = tuple([])
+t2 = tuple([1, 2])
+t3 = tuple((1, 2))
+t4 = tuple([
+    1,
+    2
+])
+t5 = tuple(
+    (1, 2)
+)
--- a/resources/test/fixtures/E501.py
+++ b/resources/test/fixtures/E501.py
@@ -14,3 +14,38 @@ Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor i

 _ = "---------------------------------------------------------------------------AAAAAAA"
 _ = "---------------------------------------------------------------------------亜亜亜亜亜亜亜"
+
+
+def caller(string: str) -> None:
+    assert string is not None
+
+
+caller(
+    """
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+    """,
+)
+
+
+caller(
+    """
+    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+    """,  # noqa: E501
+)
+
+multiple_strings_per_line = {
+    # OK
+    "Lorem ipsum dolor": "sit amet",
+    # E501 Line too long
+    "Lorem ipsum dolor": "sit amet consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
+    # E501 Line too long
+    "Lorem ipsum dolor": """
+sit amet  consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+""",
+    # OK
+    "Lorem ipsum dolor": "sit amet consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",  # noqa: E501
+    # OK
+    "Lorem ipsum dolor": """
+sit amet  consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+""",  # noqa: E501
+}
--- a/resources/test/fixtures/F401_5.py
+++ b/resources/test/fixtures/F401_5.py
@@ -0,0 +1,5 @@
+"""Test: removal of multi-segment and aliases imports."""
+from a.b import c
+from d.e import f as g
+import h.i
+import j.k as l
--- a/resources/test/fixtures/F821_0.py
+++ b/resources/test/fixtures/F821_0.py
--- a/resources/test/fixtures/F821_1.py
+++ b/resources/test/fixtures/F821_1.py
@@ -0,0 +1,30 @@
+"""Test: typing module imports."""
+from foo import cast
+
+# OK
+x = cast("Model")
+
+from typing import cast
+
+
+# F821 Undefined name `Model`
+x = cast("Model", x)
+
+
+import typing
+
+
+# F821 Undefined name `Model`
+x = typing.cast("Model", x)
+
+
+from typing import Pattern
+
+# F821 Undefined name `Model`
+x = Pattern["Model"]
+
+
+from typing.re import Match
+
+# F821 Undefined name `Model`
+x = Match["Model"]
--- a/resources/test/fixtures/F821_2.py
+++ b/resources/test/fixtures/F821_2.py
@@ -0,0 +1,18 @@
+"""Test: typing_extensions module imports."""
+from foo import Literal
+
+# F821 Undefined name `Model`
+x: Literal["Model"]
+
+from typing_extensions import Literal
+
+
+# OK
+x: Literal["Model"]
+
+
+import typing_extensions
+
+
+# OK
+x: typing_extensions.Literal["Model"]
--- a/resources/test/fixtures/F821_3.py
+++ b/resources/test/fixtures/F821_3.py
@@ -0,0 +1,14 @@
+"""Test (edge case): accesses of object named `dict`."""
+
+# OK
+dict = {"parameters": {}}
+dict["parameters"]["userId"] = "userId"
+dict["parameters"]["itemId"] = "itemId"
+del dict["parameters"]["itemId"]
+
+# F821 Undefined name `key`
+# F821 Undefined name `value`
+x: dict["key", "value"]
+
+# OK
+x: dict[str, str]
--- a/resources/test/fixtures/N802.py
+++ b/resources/test/fixtures/N802.py
@@ -1,3 +1,6 @@
+import unittest
+
+
 def Bad():
    pass

@@ -24,3 +27,15 @@ def _good():

 def good_func():
    pass
+
+
+def tearDownModule():
+    pass
+
+
+class Test(unittest.TestCase):
+    def tearDown(self):
+        return super().tearDown()
+
+    def testTest(self):
+        assert True
--- a/resources/test/fixtures/N806.py
+++ b/resources/test/fixtures/N806.py
@@ -0,0 +1,5 @@
+def f():
+    lower = 0
+    Camel = 0
+    CONSTANT = 0
+    _ = 0
--- a/resources/test/fixtures/N807.py
+++ b/resources/test/fixtures/N807.py
@@ -0,0 +1,15 @@
+def __bad__():
+    pass
+
+
+def __good():
+    pass
+
+
+def good__():
+    pass
+
+
+class Class:
+    def __good__(self):
+        pass
--- a/resources/test/fixtures/N811.py
+++ b/resources/test/fixtures/N811.py
@@ -0,0 +1,3 @@
+import mod.CONST as const
+from mod import CONSTANT as constant
+from mod import ANOTHER_CONSTANT as another_constant
--- a/resources/test/fixtures/N812.py
+++ b/resources/test/fixtures/N812.py
@@ -0,0 +1,3 @@
+import modl.lowercase as Lower
+from mod import lowercase as Lowercase
+from mod import another_lowercase as AnotherLowercase
--- a/resources/test/fixtures/N813.py
+++ b/resources/test/fixtures/N813.py
@@ -0,0 +1,3 @@
+import mod.Camel as camel
+from mod import CamelCase as camelcase
+from mod import AnotherCamelCase as another_camelcase
--- a/resources/test/fixtures/N814.py
+++ b/resources/test/fixtures/N814.py
@@ -0,0 +1,3 @@
+import mod.Camel as CAMEL
+from mod import CamelCase as CAMELCASE
+from mod import AnotherCamelCase as ANOTHER_CAMELCASE
--- a/resources/test/fixtures/N815.py
+++ b/resources/test/fixtures/N815.py
@@ -0,0 +1,6 @@
+class C:
+    lower = 0
+    CONSTANT = 0
+    mixedCase = 0
+    _mixedCase = 0
+    mixed_Case = 0
--- a/resources/test/fixtures/N816.py
+++ b/resources/test/fixtures/N816.py
@@ -0,0 +1,5 @@
+lower = 0
+CONSTANT = 0
+mixedCase = 0
+_mixedCase = 0
+mixed_Case = 0
--- a/resources/test/fixtures/N817.py
+++ b/resources/test/fixtures/N817.py
@@ -0,0 +1,2 @@
+import mod.CaMel as CM
+from mod import CamelCase as CC
--- a/resources/test/fixtures/N818.py
+++ b/resources/test/fixtures/N818.py
@@ -0,0 +1,10 @@
+class Error(Exception):
+    pass
+
+
+class AnotherError(Exception):
+    pass
+
+
+class C(Exception):
+    pass
--- a/resources/test/fixtures/RUF001.py
+++ b/resources/test/fixtures/RUF001.py
@@ -0,0 +1,6 @@
+x = "𝐁ad string"
+
+
+def f():
+    """Here's a comment with an unusual parenthesis: ）"""
+    ...
--- a/resources/test/fixtures/RUF002.py
+++ b/resources/test/fixtures/RUF002.py
@@ -0,0 +1,6 @@
+x = "𝐁ad string"
+
+
+def f():
+    """Here's a comment with an unusual parenthesis: ）"""
+    ...
--- a/resources/test/fixtures/W605_0.py
+++ b/resources/test/fixtures/W605_0.py
@@ -0,0 +1,35 @@
+#: W605:1:10
+regex = '\.png$'
+
+#: W605:2:1
+regex = '''
+\.png$
+'''
+
+#: W605:2:6
+f(
+    '\_'
+)
+
+#: W605:4:6
+"""
+multi-line
+literal
+with \_ somewhere
+in the middle
+"""
+
+#: Okay
+regex = r'\.png$'
+regex = '\\.png$'
+regex = r'''
+\.png$
+'''
+regex = r'''
+\\.png$
+'''
+s = '\\'
+regex = '\w'  # noqa
+regex = '''
+\w
+'''  # noqa
--- a/resources/test/fixtures/W605_1.py
+++ b/resources/test/fixtures/W605_1.py
@@ -0,0 +1,35 @@
+#: W605:1:10
+regex = '\.png$'
+
+#: W605:2:1
+regex = '''
+\.png$
+'''
+
+#: W605:2:6
+f(
+    '\_'
+)
+
+#: W605:4:6
+"""
+multi-line
+literal
+with \_ somewhere
+in the middle
+"""
+
+#: Okay
+regex = r'\.png$'
+regex = '\\.png$'
+regex = r'''
+\.png$
+'''
+regex = r'''
+\\.png$
+'''
+s = '\\'
+regex = '\w'  # noqa
+regex = '''
+\w
+'''  # noqa
--- a/resources/test/fixtures/init.py
+++ b/resources/test/fixtures/init.py
@@ -1,3 +1,5 @@
+import os
+
 print(__path__)

 __all__ = ["a", "b", "c"]
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles.py
@@ -0,0 +1,38 @@
+"""
+Double quotes multiline module docstring
+"""
+
+"""
+this is not a docstring
+"""
+
+l = []
+
+class Cls:
+    """
+    Double quotes multiline class docstring
+    """
+
+    """
+    this is not a docstring
+    """
+
+    # The colon in the list indexing below is an edge case for the docstring scanner
+    def f(self, bar="""
+        definitely not a docstring""",
+        val=l[Cls():3]):
+        """
+        Double quotes multiline function docstring
+        """
+
+        some_expression = 'hello world'
+
+        """
+        this is not a docstring
+        """
+
+        if l:
+            """
+            Looks like a docstring, but in reality it isn't - only modules, classes and functions
+            """
+            pass
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_class.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_class.py
@@ -0,0 +1,9 @@
+class SingleLineDocstrings():
+    """ Double quotes single line class docstring """
+    """ Not a docstring """
+
+    def foo(self, bar="""not a docstring"""):
+        """ Double quotes single line method docstring"""
+        pass
+
+    class Nested(foo()[:]): """ inline docstring """; pass
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_function.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_function.py
@@ -0,0 +1,22 @@
+def foo():
+    """function without params, single line docstring"""
+    """ not a docstring"""
+    return
+
+
+def foo2():
+    """
+        function without params, multiline docstring
+    """
+    """ not a docstring"""
+    return
+
+
+def fun_with_params_no_docstring(a, b="""
+    not a
+""" """docstring"""):
+    pass
+
+def fun_with_params_no_docstring2(a, b=c[foo():], c=\
+    """ not a docstring """):
+    pass
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_module_multiline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_module_multiline.py
@@ -0,0 +1,11 @@
+"""
+Double quotes multiline module docstring
+"""
+"""
+this is not a docstring
+"""
+def foo():
+    pass
+"""
+this is not a docstring
+"""
--- a/resources/test/fixtures/flake8_quotes/docstring_doubles_module_singleline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_doubles_module_singleline.py
@@ -0,0 +1,6 @@
+""" Double quotes singleline module docstring """
+""" this is not a docstring """
+
+def foo():
+    pass
+""" this is not a docstring """
--- a/resources/test/fixtures/flake8_quotes/docstring_singles.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles.py
@@ -0,0 +1,40 @@
+'''
+Single quotes multiline module docstring
+'''
+
+'''
+this is not a docstring
+'''
+
+l = []
+
+class Cls(MakeKlass('''
+    class params \t not a docstring
+''')):
+    '''
+    Single quotes multiline class docstring
+    '''
+
+    '''
+    this is not a docstring
+    '''
+
+    # The colon in the list indexing below is an edge case for the docstring scanner
+    def f(self, bar='''
+        definitely not a docstring''',
+        val=l[Cls():3]):
+        '''
+        Single quotes multiline function docstring
+        '''
+
+        some_expression = 'hello world'
+
+        '''
+        this is not a docstring
+        '''
+
+        if l:
+            '''
+            Looks like a docstring, but in reality it isn't - only modules, classes and functions
+            '''
+            pass
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_class.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_class.py
@@ -0,0 +1,9 @@
+class SingleLineDocstrings():
+    ''' Double quotes single line class docstring '''
+    ''' Not a docstring '''
+
+    def foo(self, bar='''not a docstring'''):
+        ''' Double quotes single line method docstring'''
+        pass
+
+    class Nested(foo()[:]): ''' inline docstring '''; pass
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_function.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_function.py
@@ -0,0 +1,23 @@
+def foo():
+    '''function without params, single line docstring'''
+    ''' not a docstring'''
+    return
+
+
+def foo2():
+    '''
+        function without params, multiline docstring
+    '''
+    ''' not a docstring'''
+    return
+
+
+def fun_with_params_no_docstring(a, b='''
+    not a 
+''' '''docstring'''):
+    pass
+
+def fun_with_params_no_docstring2(a, b=c[foo():], c=\
+    ''' not a docstring '''):
+    pass
+
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_module_multiline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_module_multiline.py
@@ -0,0 +1,11 @@
+'''
+Double quotes multiline module docstring
+'''
+'''
+this is not a docstring
+'''
+def foo():
+    pass
+'''
+this is not a docstring
+'''
--- a/resources/test/fixtures/flake8_quotes/docstring_singles_module_singleline.py
+++ b/resources/test/fixtures/flake8_quotes/docstring_singles_module_singleline.py
@@ -0,0 +1,6 @@
+''' Double quotes singleline module docstring '''
+''' this is not a docstring '''
+
+def foo():
+    pass
+''' this is not a docstring '''
--- a/resources/test/fixtures/flake8_quotes/doubles.py
+++ b/resources/test/fixtures/flake8_quotes/doubles.py
@@ -0,0 +1,2 @@
+this_should_be_linted = "double quote string"
+this_should_be_linted = u"double quote string"
--- a/resources/test/fixtures/flake8_quotes/doubles_escaped.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_escaped.py
@@ -0,0 +1,5 @@
+this_should_raise_Q003 = 'This is a \'string\''
+this_is_fine = '"This" is a \'string\''
+this_is_fine = "This is a 'string'"
+this_is_fine = "\"This\" is a 'string'"
+this_is_fine = r'This is a \'string\''
--- a/resources/test/fixtures/flake8_quotes/doubles_multiline_string.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_multiline_string.py
@@ -0,0 +1,9 @@
+s = """ This "should"
+be
+"linted" """
+
+s = ''' This "should"
+"not" be
+"linted" '''
+
+s = """'This should not be linted due to having would-be quadruple end quote'"""
--- a/resources/test/fixtures/flake8_quotes/doubles_noqa.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_noqa.py
@@ -0,0 +1 @@
+this_should_not_be_linted = "double quote string"  # noqa
--- a/resources/test/fixtures/flake8_quotes/doubles_wrapped.py
+++ b/resources/test/fixtures/flake8_quotes/doubles_wrapped.py
@@ -0,0 +1,2 @@
+s = 'double "quotes" wrapped in singles are ignored'
+s = "single 'quotes' wrapped in doubles are ignored"
--- a/resources/test/fixtures/flake8_quotes/singles.py
+++ b/resources/test/fixtures/flake8_quotes/singles.py
@@ -0,0 +1,2 @@
+this_should_be_linted = 'single quote string'
+this_should_be_linted = u'double quote string'
--- a/resources/test/fixtures/flake8_quotes/singles_escaped.py
+++ b/resources/test/fixtures/flake8_quotes/singles_escaped.py
@@ -0,0 +1,5 @@
+this_should_raise_Q003 = "This is a \"string\""
+this_is_fine = "'This' is a \"string\""
+this_is_fine = 'This is a "string"'
+this_is_fine = '\'This\' is a "string"'
+this_is_fine = r"This is a \"string\""
--- a/resources/test/fixtures/flake8_quotes/singles_multiline_string.py
+++ b/resources/test/fixtures/flake8_quotes/singles_multiline_string.py
@@ -0,0 +1,9 @@
+s = ''' This 'should'
+be
+'linted' '''
+
+s = """ This 'should'
+'not' be
+'linted' """
+
+s = '''"This should not be linted due to having would-be quadruple end quote"'''
--- a/resources/test/fixtures/flake8_quotes/singles_noqa.py
+++ b/resources/test/fixtures/flake8_quotes/singles_noqa.py
@@ -0,0 +1 @@
+this_should_not_be_linted = 'single quote string'  # noqa
--- a/resources/test/fixtures/flake8_quotes/singles_wrapped.py
+++ b/resources/test/fixtures/flake8_quotes/singles_wrapped.py
@@ -0,0 +1,2 @@
+s = "single 'quotes' wrapped in doubles are ignored"
+s = 'double "quotes" wrapped in singles are ignored'
--- a/resources/test/fixtures/pyproject.toml
+++ b/resources/test/fixtures/pyproject.toml
@@ -1,7 +1,36 @@
 [tool.ruff]
 line-length = 88
 extend-exclude = [
-    "excluded.py",
-    "migrations",
-    "directory/also_excluded.py",
+  "excluded.py",
+  "migrations",
+  "directory/also_excluded.py",
+]
+per-file-ignores = { "__init__.py" = ["F401"] }
+
+[tool.ruff.flake8-quotes]
+inline-quotes = "single"
+multiline-quotes = "double"
+docstring-quotes = "double"
+avoid-escape = true
+
+[tool.ruff.pep8-naming]
+ignore-names = [
+  "setUp",
+  "tearDown",
+  "setUpClass",
+  "tearDownClass",
+  "setUpModule",
+  "tearDownModule",
+  "asyncSetUp",
+  "asyncTearDown",
+  "setUpTestData",
+  "failureException",
+  "longMessage",
+  "maxDiff",
+]
+classmethod-decorators = [
+  "classmethod",
+]
+staticmethod-decorators = [
+  "staticmethod",
 ]
--- a/ruff_dev/Cargo.toml
+++ b/ruff_dev/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "ruff_dev"
+version = "0.0.103"
+edition = "2021"
+
+[dependencies]
+anyhow = { version = "1.0.60" }
+clap = { version = "4.0.1", features = ["derive"] }
+codegen = { version = "0.2.0" }
+itertools = { version = "0.10.5" }
+ruff = { path = ".." }
+rustpython-ast = { features = ["unparse"], git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+rustpython-common = { git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/RustPython/RustPython.git", rev = "77b821a1941019fe34f73ce17cea013ae1b98fd0" }
+strum = { version = "0.24.1", features = ["strum_macros"] }
+strum_macros = { version = "0.24.3" }
--- a/ruff_dev/src/generate_check_code_prefix.rs
+++ b/ruff_dev/src/generate_check_code_prefix.rs
@@ -0,0 +1,140 @@
+//! Generate the `CheckCodePrefix` enum.
+
+use std::collections::{BTreeMap, BTreeSet};
+use std::fs::OpenOptions;
+use std::io::Write;
+
+use anyhow::Result;
+use clap::Parser;
+use codegen::{Scope, Type, Variant};
+use itertools::Itertools;
+use ruff::checks::CheckCode;
+use strum::IntoEnumIterator;
+
+const FILE: &str = "../src/checks_gen.rs";
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+pub struct Cli {
+    /// Write the generated source code to stdout (rather than to
+    /// `src/checks_gen.rs`).
+    #[arg(long)]
+    dry_run: bool,
+}
+
+pub fn main(cli: &Cli) -> Result<()> {
+    // Build up a map from prefix to matching CheckCodes.
+    let mut prefix_to_codes: BTreeMap<String, BTreeSet<CheckCode>> = Default::default();
+    for check_code in CheckCode::iter() {
+        let as_ref: String = check_code.as_ref().to_string();
+        let prefix_len = as_ref
+            .chars()
+            .take_while(|char| char.is_alphabetic())
+            .count();
+        for i in prefix_len..=as_ref.len() {
+            let prefix = as_ref[..i].to_string();
+            let entry = prefix_to_codes.entry(prefix).or_default();
+            entry.insert(check_code.clone());
+        }
+    }
+
+    let mut scope = Scope::new();
+
+    // Create the `CheckCodePrefix` definition.
+    let mut gen = scope
+        .new_enum("CheckCodePrefix")
+        .vis("pub")
+        .derive("EnumString")
+        .derive("Debug")
+        .derive("PartialEq")
+        .derive("Eq")
+        .derive("PartialOrd")
+        .derive("Ord")
+        .derive("Clone")
+        .derive("Serialize")
+        .derive("Deserialize");
+    for prefix in prefix_to_codes.keys() {
+        gen = gen.push_variant(Variant::new(prefix.to_string()));
+    }
+
+    // Create the `PrefixSpecificity` definition.
+    scope
+        .new_enum("PrefixSpecificity")
+        .vis("pub")
+        .derive("PartialEq")
+        .derive("Eq")
+        .derive("PartialOrd")
+        .derive("Ord")
+        .push_variant(Variant::new("Category"))
+        .push_variant(Variant::new("Hundreds"))
+        .push_variant(Variant::new("Tens"))
+        .push_variant(Variant::new("Explicit"));
+
+    // Create the `match` statement, to map from definition to relevant codes.
+    let mut gen = scope
+        .new_impl("CheckCodePrefix")
+        .new_fn("codes")
+        .arg_ref_self()
+        .ret(Type::new("Vec<CheckCode>"))
+        .vis("pub")
+        .line("match self {");
+    for (prefix, codes) in &prefix_to_codes {
+        gen = gen.line(format!(
+            "CheckCodePrefix::{prefix} => vec![{}],",
+            codes
+                .iter()
+                .map(|code| format!("CheckCode::{}", code.as_ref()))
+                .join(", ")
+        ));
+    }
+    gen.line("}");
+
+    // Create the `match` statement, to map from definition to specificity.
+    let mut gen = scope
+        .new_impl("CheckCodePrefix")
+        .new_fn("specificity")
+        .arg_ref_self()
+        .ret(Type::new("PrefixSpecificity"))
+        .vis("pub")
+        .line("match self {");
+    for prefix in prefix_to_codes.keys() {
+        let num_numeric = prefix.chars().filter(|char| char.is_numeric()).count();
+        let specificity = match num_numeric {
+            3 => "Explicit",
+            2 => "Tens",
+            1 => "Hundreds",
+            0 => "Category",
+            _ => panic!("Invalid prefix: {}", prefix),
+        };
+        gen = gen.line(format!(
+            "CheckCodePrefix::{prefix} => PrefixSpecificity::{},",
+            specificity
+        ));
+    }
+    gen.line("}");
+
+    // Construct the output contents.
+    let mut output = String::new();
+    output.push_str("//! File automatically generated by examples/generate_check_code_prefix.rs.");
+    output.push('\n');
+    output.push('\n');
+    output.push_str("use serde::{{Serialize, Deserialize}};");
+    output.push('\n');
+    output.push_str("use strum_macros::EnumString;");
+    output.push('\n');
+    output.push('\n');
+    output.push_str("use crate::checks::CheckCode;");
+    output.push('\n');
+    output.push('\n');
+    output.push_str(&scope.to_string());
+
+    // Write the output to `src/checks_gen.rs` (or stdout).
+    if cli.dry_run {
+        println!("{}", output);
+    } else {
+        let mut f = OpenOptions::new().write(true).truncate(true).open(FILE)?;
+        write!(f, "{}", output)?;
+    }
+
+    Ok(())
+}
--- a/ruff_dev/src/generate_rules_table.rs
+++ b/ruff_dev/src/generate_rules_table.rs
@@ -0,0 +1,89 @@
+//! Generate a Markdown-compatible table of supported lint rules.
+
+use std::fs;
+use std::fs::OpenOptions;
+use std::io::Write;
+
+use anyhow::Result;
+use clap::Args;
+use ruff::checks::{CheckCategory, CheckCode};
+use strum::IntoEnumIterator;
+
+const FILE: &str = "../README.md";
+const BEGIN_PRAGMA: &str = "<!-- Begin auto-generated sections. -->";
+const END_PRAGMA: &str = "<!-- End auto-generated sections. -->";
+
+#[derive(Args)]
+pub struct Cli {
+    /// Write the generated table to stdout (rather than to `README.md`).
+    #[arg(long)]
+    dry_run: bool,
+}
+
+pub fn main(cli: &Cli) -> Result<()> {
+    // Generate the table string.
+    let mut output = String::new();
+    for check_category in CheckCategory::iter() {
+        output.push_str(&format!("### {}", check_category.title()));
+        output.push('\n');
+        output.push('\n');
+
+        if let Some(url) = check_category.url() {
+            output.push_str(&format!(
+                "For more, see [{}]({}) on PyPI.",
+                check_category.title(),
+                url
+            ));
+            output.push('\n');
+            output.push('\n');
+        }
+
+        output.push_str("| Code | Name | Message | Fix |");
+        output.push('\n');
+        output.push_str("| ---- | ---- | ------- | --- |");
+        output.push('\n');
+
+        for check_code in CheckCode::iter() {
+            if check_code.category() == check_category {
+                let check_kind = check_code.kind();
+                let fix_token = if check_kind.fixable() { "🛠" } else { "" };
+                output.push_str(&format!(
+                    "| {} | {} | {} | {} |",
+                    check_kind.code().as_ref(),
+                    check_kind.as_ref(),
+                    check_kind.summary().replace('|', r"\|"),
+                    fix_token
+                ));
+                output.push('\n');
+            }
+        }
+        output.push('\n');
+    }
+
+    if cli.dry_run {
+        print!("{}", output);
+    } else {
+        // Read the existing file.
+        let existing = fs::read_to_string(FILE)?;
+
+        // Extract the prefix.
+        let index = existing
+            .find(BEGIN_PRAGMA)
+            .expect("Unable to find begin pragma.");
+        let prefix = &existing[..index + BEGIN_PRAGMA.len()];
+
+        // Extract the suffix.
+        let index = existing
+            .find(END_PRAGMA)
+            .expect("Unable to find end pragma.");
+        let suffix = &existing[index..];
+
+        // Write the prefix, new contents, and suffix.
+        let mut f = OpenOptions::new().write(true).truncate(true).open(FILE)?;
+        write!(f, "{}\n\n", prefix)?;
+        write!(f, "{}", output)?;
+        write!(f, "{}", suffix)?;
+    }
+
+    Ok(())
+}
--- a/ruff_dev/src/generate_source_code.rs
+++ b/ruff_dev/src/generate_source_code.rs
@@ -1,26 +1,25 @@
+//! Run round-trip source code generation on a given Python file.
+
+use std::fs;
 use std::path::PathBuf;

 use anyhow::Result;
-use clap::Parser;
+use clap::Args;
+use ruff::code_gen::SourceGenerator;
 use rustpython_parser::parser;

-use ruff::code_gen::SourceGenerator;
-use ruff::fs;
-
-#[derive(Debug, Parser)]
-struct Cli {
+#[derive(Args)]
+pub struct Cli {
+    /// Python file to round-trip.
    #[arg(required = true)]
    file: PathBuf,
 }

-fn main() -> Result<()> {
-    let cli = Cli::parse();
-
-    let contents = fs::read_file(&cli.file)?;
+pub fn main(cli: &Cli) -> Result<()> {
+    let contents = fs::read_to_string(&cli.file)?;
    let python_ast = parser::parse_program(&contents, &cli.file.to_string_lossy())?;
    let mut generator = SourceGenerator::new();
    generator.unparse_suite(&python_ast)?;
    println!("{}", generator.generate()?);
-
    Ok(())
 }
--- a/ruff_dev/src/lib.rs
+++ b/ruff_dev/src/lib.rs
@@ -0,0 +1,5 @@
+pub mod generate_check_code_prefix;
+pub mod generate_rules_table;
+pub mod generate_source_code;
+pub mod print_ast;
+pub mod print_tokens;
--- a/ruff_dev/src/main.rs
+++ b/ruff_dev/src/main.rs
@@ -0,0 +1,39 @@
+use anyhow::Result;
+use clap::{Parser, Subcommand};
+use ruff_dev::{
+    generate_check_code_prefix, generate_rules_table, generate_source_code, print_ast, print_tokens,
+};
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+#[command(propagate_version = true)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Generate the `CheckCodePrefix` enum.
+    GenerateCheckCodePrefix(generate_check_code_prefix::Cli),
+    /// Generate a Markdown-compatible table of supported lint rules.
+    GenerateRulesTable(generate_rules_table::Cli),
+    /// Run round-trip source code generation on a given Python file.
+    GenerateSourceCode(generate_source_code::Cli),
+    /// Print the AST for a given Python file.
+    PrintAST(print_ast::Cli),
+    /// Print the token stream for a given Python file.
+    PrintTokens(print_tokens::Cli),
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+    match &cli.command {
+        Commands::GenerateCheckCodePrefix(args) => generate_check_code_prefix::main(args)?,
+        Commands::GenerateRulesTable(args) => generate_rules_table::main(args)?,
+        Commands::GenerateSourceCode(args) => generate_source_code::main(args)?,
+        Commands::PrintAST(args) => print_ast::main(args)?,
+        Commands::PrintTokens(args) => print_tokens::main(args)?,
+    }
+    Ok(())
+}
--- a/ruff_dev/src/print_ast.rs
+++ b/ruff_dev/src/print_ast.rs
@@ -1,26 +1,22 @@
 //! Print the AST for a given Python file.

+use std::fs;
 use std::path::PathBuf;

 use anyhow::Result;
-use clap::Parser;
+use clap::Args;
 use rustpython_parser::parser;

-use ruff::fs;
-
-#[derive(Debug, Parser)]
-struct Cli {
+#[derive(Args)]
+pub struct Cli {
+    /// Python file for which to generate the AST.
    #[arg(required = true)]
    file: PathBuf,
 }

-fn main() -> Result<()> {
-    let cli = Cli::parse();
-
-    let contents = fs::read_file(&cli.file)?;
+pub fn main(cli: &Cli) -> Result<()> {
+    let contents = fs::read_to_string(&cli.file)?;
    let python_ast = parser::parse_program(&contents, &cli.file.to_string_lossy())?;
-
    println!("{:#?}", python_ast);
-
    Ok(())
 }
--- a/ruff_dev/src/print_tokens.rs
+++ b/ruff_dev/src/print_tokens.rs
@@ -1,26 +1,23 @@
 //! Print the token stream for a given Python file.

+use std::fs;
 use std::path::PathBuf;

 use anyhow::Result;
-use clap::Parser;
+use clap::Args;
 use rustpython_parser::lexer;

-use ruff::fs;
-
-#[derive(Debug, Parser)]
-struct Cli {
+#[derive(Args)]
+pub struct Cli {
+    /// Python file for which to generate the AST.
    #[arg(required = true)]
    file: PathBuf,
 }

-fn main() -> Result<()> {
-    let cli = Cli::parse();
-
-    let contents = fs::read_file(&cli.file)?;
+pub fn main(cli: &Cli) -> Result<()> {
+    let contents = fs::read_to_string(&cli.file)?;
    for (_, tok, _) in lexer::make_tokenizer(&contents).flatten() {
        println!("{:#?}", tok);
    }
-
    Ok(())
 }
--- a/1
+++ b/1
@@ -0,0 +1 @@
+1.65.0
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -0,0 +1,15 @@
+condense_wildcard_suffixes = true
+edition = "2021"
+format_strings = true
+group_imports = "StdExternalCrate"
+hex_literal_case = "Lower"
+imports_granularity = "Module"
+max_width = 100
+normalize_comments = true
+normalize_doc_attributes = true
+reorder_impl_items = true
+reorder_imports = true
+reorder_modules = true
+unstable_features = true
+use_field_init_shorthand = true
+wrap_comments = true
--- a/scripts/.flake8
+++ b/scripts/.flake8
@@ -17,3 +17,5 @@ exclude =
    test_fstring.py,
    bad_coding2.py,
    badsyntax_*.py
+ignore_names = foo, bar
+quotes = double
--- a/src/ast/helpers.rs
+++ b/src/ast/helpers.rs
@@ -1,9 +1,9 @@
+use std::collections::BTreeSet;
+
 use once_cell::sync::Lazy;
 use regex::Regex;
 use rustpython_ast::{Excepthandler, ExcepthandlerKind, Expr, ExprKind, Location, StmtKind};

-use crate::python::typing;
-
 fn compose_call_path_inner<'a>(expr: &'a Expr, parts: &mut Vec<&'a str>) {
    match &expr.node {
        ExprKind::Call { func, .. } => {
@@ -30,6 +30,7 @@ pub fn compose_call_path(expr: &Expr) -> Option<String> {
    }
 }

+/// Return `true` if the `Expr` is a name or attribute reference to `${target}`.
 pub fn match_name_or_attr(expr: &Expr, target: &str) -> bool {
    match &expr.node {
        ExprKind::Attribute { attr, .. } => target == attr,
@@ -38,40 +39,36 @@ pub fn match_name_or_attr(expr: &Expr, target: &str) -> bool {
    }
 }

-pub enum SubscriptKind {
-    AnnotatedSubscript,
-    PEP593AnnotatedSubscript,
-}
-
-pub fn match_annotated_subscript(expr: &Expr) -> Option<SubscriptKind> {
+/// Return `true` if the `Expr` is a reference to `${module}.${target}`.
+///
+/// Useful for, e.g., ensuring that a `Union` reference represents
+/// `typing.Union`.
+pub fn match_name_or_attr_from_module(
+    expr: &Expr,
+    target: &str,
+    module: &str,
+    imports: Option<&BTreeSet<&str>>,
+) -> bool {
    match &expr.node {
-        ExprKind::Attribute { attr, .. } => {
-            if typing::is_annotated_subscript(attr) {
-                Some(SubscriptKind::AnnotatedSubscript)
-            } else if typing::is_pep593_annotated_subscript(attr) {
-                Some(SubscriptKind::PEP593AnnotatedSubscript)
-            } else {
-                None
-            }
-        }
+        ExprKind::Attribute { value, attr, .. } => match &value.node {
+            ExprKind::Name { id, .. } => id == module && target == attr,
+            _ => false,
+        },
        ExprKind::Name { id, .. } => {
-            if typing::is_annotated_subscript(id) {
-                Some(SubscriptKind::AnnotatedSubscript)
-            } else if typing::is_pep593_annotated_subscript(id) {
-                Some(SubscriptKind::PEP593AnnotatedSubscript)
-            } else {
-                None
-            }
+            target == id
+                && imports
+                    .map(|imports| imports.contains(&id.as_str()))
+                    .unwrap_or_default()
        }
-        _ => None,
+        _ => false,
    }
 }

 static DUNDER_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"__[^\s]+__").unwrap());

 pub fn is_assignment_to_a_dunder(node: &StmtKind) -> bool {
-    // Check whether it's an assignment to a dunder, with or without a type annotation.
-    // This is what pycodestyle (as of 2.9.1) does.
+    // Check whether it's an assignment to a dunder, with or without a type
+    // annotation. This is what pycodestyle (as of 2.9.1) does.
    match node {
        StmtKind::Assign {
            targets,
@@ -132,12 +129,13 @@ pub fn is_super_call_with_arguments(func: &Expr, args: &[Expr]) -> bool {
    }
 }

-/// Convert a location within a file (relative to `base`) to an absolute position.
+/// Convert a location within a file (relative to `base`) to an absolute
+/// position.
 pub fn to_absolute(relative: &Location, base: &Location) -> Location {
    if relative.row() == 1 {
        Location::new(
            relative.row() + base.row() - 1,
-            relative.column() + base.column() - 1,
+            relative.column() + base.column(),
        )
    } else {
        Location::new(relative.row() + base.row() - 1, relative.column())
--- a/src/ast/mod.rs
+++ b/src/ast/mod.rs
--- a/src/ast/operations.rs
+++ b/src/ast/operations.rs
@@ -1,6 +1,6 @@
-use rustpython_parser::ast::{Constant, Expr, ExprKind, Location, Stmt, StmtKind};
+use rustpython_parser::ast::{Constant, Expr, ExprKind, Stmt, StmtKind};

-use crate::ast::types::{BindingKind, Range, Scope};
+use crate::ast::types::{BindingKind, Scope};

 /// Extract the names bound to a given __all__ assignment.
 pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<String> {
@@ -117,69 +117,3 @@ pub fn is_unpacking_assignment(stmt: &Stmt) -> bool {
    }
    false
 }
-
-/// Struct used to efficiently slice source code at (row, column) Locations.
-pub struct SourceCodeLocator<'a> {
-    content: &'a str,
-    offsets: Vec<Vec<usize>>,
-    initialized: bool,
-}
-
-impl<'a> SourceCodeLocator<'a> {
-    pub fn new(content: &'a str) -> Self {
-        SourceCodeLocator {
-            content,
-            offsets: vec![],
-            initialized: false,
-        }
-    }
-
-    fn init(&mut self) {
-        if !self.initialized {
-            let mut offset = 0;
-            for line in self.content.lines() {
-                let mut newline = 0;
-                let mut line_offsets: Vec<usize> = vec![];
-                for (i, _char) in line.char_indices() {
-                    line_offsets.push(offset + i);
-                    newline = i + 1;
-                }
-                line_offsets.push(offset + newline);
-                self.offsets.push(line_offsets);
-                offset += newline + 1;
-            }
-            self.offsets.push(vec![offset]);
-            self.initialized = true;
-        }
-    }
-
-    pub fn slice_source_code_at(&mut self, location: &Location) -> &'a str {
-        self.init();
-        let offset = self.offsets[location.row() - 1][location.column() - 1];
-        &self.content[offset..]
-    }
-
-    pub fn slice_source_code_range(&mut self, range: &Range) -> &'a str {
-        self.init();
-        let start = self.offsets[range.location.row() - 1][range.location.column() - 1];
-        let end = self.offsets[range.end_location.row() - 1][range.end_location.column() - 1];
-        &self.content[start..end]
-    }
-
-    pub fn partition_source_code_at(
-        &mut self,
-        outer: &Range,
-        inner: &Range,
-    ) -> (&'a str, &'a str, &'a str) {
-        self.init();
-        let outer_start = self.offsets[outer.location.row() - 1][outer.location.column() - 1];
-        let outer_end = self.offsets[outer.end_location.row() - 1][outer.end_location.column() - 1];
-        let inner_start = self.offsets[inner.location.row() - 1][inner.location.column() - 1];
-        let inner_end = self.offsets[inner.end_location.row() - 1][inner.end_location.column() - 1];
-        (
-            &self.content[outer_start..inner_start],
-            &self.content[inner_start..inner_end],
-            &self.content[inner_end..outer_end],
-        )
-    }
-}
--- a/src/ast/relocate.rs
+++ b/src/ast/relocate.rs
@@ -8,7 +8,8 @@ fn relocate_keyword(keyword: &mut Keyword, location: Range) {
    relocate_expr(&mut keyword.node.value, location);
 }

-/// Change an expression's location (recursively) to match a desired, fixed location.
+/// Change an expression's location (recursively) to match a desired, fixed
+/// location.
 pub fn relocate_expr(expr: &mut Expr, location: Range) {
    expr.location = location.location;
    expr.end_location = Some(location.end_location);
--- a/src/ast/types.rs
+++ b/src/ast/types.rs
@@ -36,6 +36,7 @@ pub enum ScopeKind {
    Function(FunctionScope),
    Generator,
    Module,
+    Arg,
 }

 #[derive(Clone, Debug)]
@@ -85,8 +86,8 @@ pub enum BindingKind {
 pub struct Binding {
    pub kind: BindingKind,
    pub range: Range,
-    /// Tuple of (scope index, range) indicating the scope and range at which the binding was
-    /// last used.
+    /// Tuple of (scope index, range) indicating the scope and range at which
+    /// the binding was last used.
    pub used: Option<(usize, Range)>,
 }

--- a/src/autofix/fixer.rs
+++ b/src/autofix/fixer.rs
@@ -1,11 +1,17 @@
-use crate::autofix::Fix;
-use crate::autofix::Patch;
-use itertools::Itertools;
-use rustpython_parser::ast::Location;
+use std::borrow::Cow;
 use std::collections::BTreeSet;

-use crate::checks::Check;
+use itertools::Itertools;
+use ropey::RopeBuilder;
+use rustpython_parser::ast::Location;

+use crate::ast::types::Range;
+use crate::autofix::{Fix, Patch};
+use crate::checks::Check;
+use crate::source_code_locator::SourceCodeLocator;
+
+// TODO(charlie): The model here is awkward because `Apply` is only relevant at
+// higher levels in the execution flow.
 #[derive(Hash)]
 pub enum Mode {
    Generate,
@@ -13,6 +19,17 @@ pub enum Mode {
    None,
 }

+impl Mode {
+    /// Return `true` if a patch should be generated under the given `Mode`.
+    pub fn patch(&self) -> bool {
+        match &self {
+            Mode::Generate => true,
+            Mode::Apply => true,
+            Mode::None => false,
+        }
+    }
+}
+
 impl From<bool> for Mode {
    fn from(value: bool) -> Self {
        match value {
@@ -23,77 +40,64 @@ impl From<bool> for Mode {
 }

 /// Auto-fix errors in a file, and write the fixed source code to disk.
-pub fn fix_file(checks: &mut [Check], contents: &str) -> Option<String> {
+pub fn fix_file<'a>(
+    checks: &'a mut [Check],
+    locator: &'a SourceCodeLocator<'a>,
+) -> Option<Cow<'a, str>> {
    if checks.iter().all(|check| check.fix.is_none()) {
        return None;
    }

    Some(apply_fixes(
        checks.iter_mut().filter_map(|check| check.fix.as_mut()),
-        contents,
+        locator,
    ))
 }

 /// Apply a series of fixes.
-fn apply_fixes<'a>(fixes: impl Iterator<Item = &'a mut Fix>, contents: &str) -> String {
-    let lines: Vec<&str> = contents.lines().collect();
-
-    let mut output: String = Default::default();
-    let mut last_pos: Location = Default::default();
-    let mut applied: BTreeSet<&Patch> = Default::default();
+fn apply_fixes<'a>(
+    fixes: impl Iterator<Item = &'a mut Fix>,
+    locator: &'a SourceCodeLocator<'a>,
+) -> Cow<'a, str> {
+    let mut output = RopeBuilder::new();
+    let mut last_pos: Location = Location::new(1, 0);
+    let mut applied: BTreeSet<&Patch> = BTreeSet::new();

    for fix in fixes.sorted_by_key(|fix| fix.patch.location) {
-        // If we already applied an identical fix as part of another correction, skip any
-        // re-application.
+        // If we already applied an identical fix as part of another correction, skip
+        // any re-application.
        if applied.contains(&fix.patch) {
            fix.applied = true;
            continue;
        }

-        // Best-effort approach: if this fix overlaps with a fix we've already applied, skip it.
+        // Best-effort approach: if this fix overlaps with a fix we've already applied,
+        // skip it.
        if last_pos > fix.patch.location {
            continue;
        }

-        if fix.patch.location.row() > last_pos.row() {
-            if last_pos.row() > 0 || last_pos.column() > 0 {
-                output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
-                output.push('\n');
-            }
-            for line in &lines[last_pos.row()..fix.patch.location.row() - 1] {
-                output.push_str(line);
-                output.push('\n');
-            }
-            output
-                .push_str(&lines[fix.patch.location.row() - 1][..fix.patch.location.column() - 1]);
-            output.push_str(&fix.patch.content);
-        } else {
-            output.push_str(
-                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.patch.location.column() - 1],
-            );
-            output.push_str(&fix.patch.content);
-        }
-        last_pos = fix.patch.end_location;
+        // Add all contents from `last_pos` to `fix.patch.location`.
+        let slice = locator.slice_source_code_range(&Range {
+            location: last_pos,
+            end_location: fix.patch.location,
+        });
+        output.append(&slice);

+        // Add the patch itself.
+        output.append(&fix.patch.content);
+
+        // Track that the fix was applied.
+        last_pos = fix.patch.end_location;
        applied.insert(&fix.patch);
        fix.applied = true;
    }

-    if last_pos.row() > 0
-        && (last_pos.row() - 1) < lines.len()
-        && (last_pos.row() > 0 || last_pos.column() > 0)
-    {
-        output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
-        output.push('\n');
-    }
-    if last_pos.row() < lines.len() {
-        for line in &lines[last_pos.row()..] {
-            output.push_str(line);
-            output.push('\n');
-        }
-    }
+    // Add the remaining content.
+    let slice = locator.slice_source_code_at(&last_pos);
+    output.append(&slice);

-    output
+    Cow::from(output.finish())
 }

 #[cfg(test)]
@@ -102,13 +106,14 @@ mod tests {
    use rustpython_parser::ast::Location;

    use crate::autofix::fixer::apply_fixes;
-    use crate::autofix::Fix;
-    use crate::autofix::Patch;
+    use crate::autofix::{Fix, Patch};
+    use crate::SourceCodeLocator;

    #[test]
    fn empty_file() -> Result<()> {
        let mut fixes = vec![];
-        let actual = apply_fixes(fixes.iter_mut(), "");
+        let locator = SourceCodeLocator::new("");
+        let actual = apply_fixes(fixes.iter_mut(), &locator);
        let expected = "";

        assert_eq!(actual, expected);
@@ -121,17 +126,17 @@ mod tests {
        let mut fixes = vec![Fix {
            patch: Patch {
                content: "Bar".to_string(),
-                location: Location::new(1, 9),
-                end_location: Location::new(1, 15),
+                location: Location::new(1, 8),
+                end_location: Location::new(1, 14),
            },
            applied: false,
        }];
-        let actual = apply_fixes(
-            fixes.iter_mut(),
+        let locator = SourceCodeLocator::new(
            "class A(object):
        ...
 ",
        );
+        let actual = apply_fixes(fixes.iter_mut(), &locator);

        let expected = "class A(Bar):
        ...
@@ -147,17 +152,17 @@ mod tests {
        let mut fixes = vec![Fix {
            patch: Patch {
                content: "".to_string(),
-                location: Location::new(1, 8),
-                end_location: Location::new(1, 16),
+                location: Location::new(1, 7),
+                end_location: Location::new(1, 15),
            },
            applied: false,
        }];
-        let actual = apply_fixes(
-            fixes.iter_mut(),
+        let locator = SourceCodeLocator::new(
            "class A(object):
        ...
 ",
        );
+        let actual = apply_fixes(fixes.iter_mut(), &locator);

        let expected = "class A:
        ...
@@ -174,26 +179,26 @@ mod tests {
            Fix {
                patch: Patch {
                    content: "".to_string(),
-                    location: Location::new(1, 8),
-                    end_location: Location::new(1, 17),
+                    location: Location::new(1, 7),
+                    end_location: Location::new(1, 16),
                },
                applied: false,
            },
            Fix {
                patch: Patch {
                    content: "".to_string(),
-                    location: Location::new(1, 17),
-                    end_location: Location::new(1, 24),
+                    location: Location::new(1, 16),
+                    end_location: Location::new(1, 23),
                },
                applied: false,
            },
        ];
-        let actual = apply_fixes(
-            fixes.iter_mut(),
+        let locator = SourceCodeLocator::new(
            "class A(object, object):
        ...
 ",
        );
+        let actual = apply_fixes(fixes.iter_mut(), &locator);

        let expected = "class A:
        ...
@@ -210,26 +215,26 @@ mod tests {
            Fix {
                patch: Patch {
                    content: "".to_string(),
-                    location: Location::new(1, 8),
-                    end_location: Location::new(1, 16),
+                    location: Location::new(1, 7),
+                    end_location: Location::new(1, 15),
                },
                applied: false,
            },
            Fix {
                patch: Patch {
                    content: "ignored".to_string(),
-                    location: Location::new(1, 10),
-                    end_location: Location::new(1, 12),
+                    location: Location::new(1, 9),
+                    end_location: Location::new(1, 11),
                },
                applied: false,
            },
        ];
-        let actual = apply_fixes(
-            fixes.iter_mut(),
+        let locator = SourceCodeLocator::new(
            "class A(object):
    ...
 ",
        );
+        let actual = apply_fixes(fixes.iter_mut(), &locator);

        let expected = "class A:
    ...
--- a/src/autofix/helpers.rs
+++ b/src/autofix/helpers.rs
@@ -4,7 +4,8 @@ use rustpython_parser::ast::{ExcepthandlerKind, Location, Stmt, StmtKind};

 use crate::autofix::Fix;

-/// Determine if a body contains only a single statement, taking into account deleted.
+/// Determine if a body contains only a single statement, taking into account
+/// deleted.
 fn has_single_child(body: &[Stmt], deleted: &[&Stmt]) -> bool {
    body.iter().filter(|child| !deleted.contains(child)).count() == 1
 }
@@ -80,10 +81,11 @@ pub fn remove_stmt(stmt: &Stmt, parent: Option<&Stmt>, deleted: &[&Stmt]) -> Res
        ))
    } else {
        // Otherwise, nuke the entire line.
-        // TODO(charlie): This logic assumes that there are no multi-statement physical lines.
+        // TODO(charlie): This logic assumes that there are no multi-statement physical
+        // lines.
        Ok(Fix::deletion(
-            Location::new(stmt.location.row(), 1),
-            Location::new(stmt.end_location.unwrap().row() + 1, 1),
+            Location::new(stmt.location.row(), 0),
+            Location::new(stmt.end_location.unwrap().row() + 1, 0),
        ))
    }
 }
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,4 +1,5 @@
-// cacache uses asyncd-std which has no wasm support, so currently no caching support on wasm
+// cacache uses asyncd-std which has no wasm support, so currently no caching
+// support on wasm
 #![cfg_attr(
    target_family = "wasm",
    allow(unused_imports, unused_variables, dead_code)
@@ -127,7 +128,7 @@ pub fn get(
            }
            Err(e) => error!("Failed to deserialize encoded cache entry: {e:?}"),
        },
-        Err(EntryNotFound(_, _)) => {}
+        Err(EntryNotFound(..)) => {}
        Err(e) => error!("Failed to read from cache: {e:?}"),
    }
    None
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -1,3 +1,5 @@
+//! Lint rules based on AST traversal.
+
 use std::collections::{BTreeMap, BTreeSet};
 use std::ops::Deref;
 use std::path::Path;
@@ -9,8 +11,8 @@ use rustpython_parser::ast::{
 };
 use rustpython_parser::parser;

-use crate::ast::helpers::{extract_handler_names, match_name_or_attr, SubscriptKind};
-use crate::ast::operations::{extract_all_names, SourceCodeLocator};
+use crate::ast::helpers::{extract_handler_names, match_name_or_attr_from_module};
+use crate::ast::operations::extract_all_names;
 use crate::ast::relocate::relocate_expr;
 use crate::ast::types::{
    Binding, BindingContext, BindingKind, CheckLocator, FunctionScope, ImportKind, Range, Scope,
@@ -23,21 +25,36 @@ use crate::checks::{Check, CheckCode, CheckKind};
 use crate::docstrings::definition::{Definition, DefinitionKind, Documentable};
 use crate::python::builtins::{BUILTINS, MAGIC_GLOBALS};
 use crate::python::future::ALL_FEATURE_NAMES;
-use crate::settings::{PythonVersion, Settings};
+use crate::python::typing;
+use crate::python::typing::SubscriptKind;
+use crate::settings::types::PythonVersion;
+use crate::settings::Settings;
+use crate::source_code_locator::SourceCodeLocator;
 use crate::visibility::{module_visibility, transition_scope, Modifier, Visibility, VisibleScope};
 use crate::{
    docstrings, flake8_bugbear, flake8_builtins, flake8_comprehensions, flake8_print, pep8_naming,
    pycodestyle, pydocstyle, pyflakes, pyupgrade,
 };

-pub const GLOBAL_SCOPE_INDEX: usize = 0;
+const GLOBAL_SCOPE_INDEX: usize = 0;
+const TRACK_FROM_IMPORTS: [&str; 9] = [
+    "collections",
+    "collections.abc",
+    "contextlib",
+    "re",
+    "typing",
+    "typing.io",
+    "typing.re",
+    "typing_extensions",
+    "weakref",
+];

 pub struct Checker<'a> {
    // Input data.
-    pub(crate) path: &'a Path,
-    pub(crate) locator: SourceCodeLocator<'a>,
+    path: &'a Path,
+    autofix: &'a fixer::Mode,
    pub(crate) settings: &'a Settings,
-    pub(crate) autofix: &'a fixer::Mode,
+    pub(crate) locator: &'a SourceCodeLocator<'a>,
    // Computed checks.
    checks: Vec<Check>,
    // Docstring tracking.
@@ -62,10 +79,12 @@ pub struct Checker<'a> {
    in_f_string: Option<Range>,
    in_annotation: bool,
    in_literal: bool,
+    in_subscript: bool,
    seen_import_boundary: bool,
    futures_allowed: bool,
    annotations_future_enabled: bool,
    except_handlers: Vec<Vec<String>>,
+    from_imports: BTreeMap<&'a str, BTreeSet<&'a str>>,
 }

 impl<'a> Checker<'a> {
@@ -73,13 +92,13 @@ impl<'a> Checker<'a> {
        settings: &'a Settings,
        autofix: &'a fixer::Mode,
        path: &'a Path,
-        content: &'a str,
+        locator: &'a SourceCodeLocator,
    ) -> Checker<'a> {
        Checker {
            settings,
            autofix,
            path,
-            locator: SourceCodeLocator::new(content),
+            locator,
            checks: Default::default(),
            docstrings: Default::default(),
            deletions: Default::default(),
@@ -97,15 +116,37 @@ impl<'a> Checker<'a> {
                modifier: Modifier::Module,
                visibility: module_visibility(path),
            },
-            in_f_string: None,
+            in_f_string: Default::default(),
            in_annotation: Default::default(),
            in_literal: Default::default(),
+            in_subscript: Default::default(),
            seen_import_boundary: Default::default(),
            futures_allowed: true,
            annotations_future_enabled: Default::default(),
            except_handlers: Default::default(),
+            from_imports: Default::default(),
        }
    }
+
+    /// Return `true` if a patch should be generated under the given autofix
+    /// `Mode`.
+    pub fn patch(&self) -> bool {
+        // TODO(charlie): We can't fix errors in f-strings until RustPython adds
+        // location data.
+        self.autofix.patch() && self.in_f_string.is_none()
+    }
+
+    /// Return `true` if the `Expr` is a reference to `typing.${target}`.
+    pub fn match_typing_module(&self, expr: &Expr, target: &str) -> bool {
+        match_name_or_attr_from_module(expr, target, "typing", self.from_imports.get("typing"))
+            || (typing::in_extensions(target)
+                && match_name_or_attr_from_module(
+                    expr,
+                    target,
+                    "typing_extensions",
+                    self.from_imports.get("typing_extensions"),
+                ))
+    }
 }

 impl<'a, 'b> Visitor<'b> for Checker<'a>
@@ -199,6 +240,7 @@ where
                decorator_list,
                returns,
                args,
+                body,
                ..
            }
            | StmtKind::AsyncFunctionDef {
@@ -206,6 +248,7 @@ where
                decorator_list,
                returns,
                args,
+                body,
                ..
            } => {
                if self.settings.enabled.contains(&CheckCode::E743) {
@@ -218,7 +261,11 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::N802) {
-                    if let Some(check) = pep8_naming::checks::invalid_function_name(stmt, name) {
+                    if let Some(check) = pep8_naming::checks::invalid_function_name(
+                        stmt,
+                        name,
+                        &self.settings.pep8_naming,
+                    ) {
                        self.checks.push(check);
                    }
                }
@@ -229,6 +276,7 @@ where
                            self.current_scope(),
                            decorator_list,
                            args,
+                            &self.settings.pep8_naming,
                        )
                    {
                        self.checks.push(check);
@@ -240,14 +288,28 @@ where
                        self.current_scope(),
                        decorator_list,
                        args,
+                        &self.settings.pep8_naming,
                    ) {
                        self.checks.push(check);
                    }
                }

+                if self.settings.enabled.contains(&CheckCode::N807) {
+                    if let Some(check) =
+                        pep8_naming::checks::dunder_function_name(stmt, self.current_scope(), name)
+                    {
+                        self.checks.push(check);
+                    }
+                }
+
+                if self.settings.enabled.contains(&CheckCode::B018) {
+                    flake8_bugbear::plugins::useless_expression(self, body);
+                }
+
                self.check_builtin_shadowing(name, Range::from_located(stmt), true);

-                // Visit the decorators and arguments, but avoid the body, which will be deferred.
+                // Visit the decorators and arguments, but avoid the body, which will be
+                // deferred.
                for expr in decorator_list {
                    self.visit_expr(expr);
                }
@@ -314,6 +376,7 @@ where
                bases,
                keywords,
                decorator_list,
+                body,
                ..
            } => {
                if self.settings.enabled.contains(&CheckCode::U004) {
@@ -337,6 +400,18 @@ where
                    }
                }

+                if self.settings.enabled.contains(&CheckCode::N818) {
+                    if let Some(check) =
+                        pep8_naming::checks::error_suffix_on_exception_name(stmt, bases, name)
+                    {
+                        self.checks.push(check);
+                    }
+                }
+
+                if self.settings.enabled.contains(&CheckCode::B018) {
+                    flake8_bugbear::plugins::useless_expression(self, body);
+                }
+
                self.check_builtin_shadowing(
                    name,
                    self.locate_check(Range::from_located(stmt)),
@@ -356,7 +431,7 @@ where
            }
            StmtKind::Import { names } => {
                if self.settings.enabled.contains(&CheckCode::E402) {
-                    if self.seen_import_boundary && stmt.location.column() == 1 {
+                    if self.seen_import_boundary && stmt.location.column() == 0 {
                        self.checks.push(Check::new(
                            CheckKind::ModuleImportNotAtTopOfFile,
                            self.locate_check(Range::from_located(stmt)),
@@ -405,6 +480,55 @@ where
                            },
                        )
                    }
+
+                    if let Some(asname) = &alias.node.asname {
+                        let name = alias.node.name.split('.').last().unwrap();
+                        if self.settings.enabled.contains(&CheckCode::N811) {
+                            if let Some(check) =
+                                pep8_naming::checks::constant_imported_as_non_constant(
+                                    stmt, name, asname,
+                                )
+                            {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N812) {
+                            if let Some(check) =
+                                pep8_naming::checks::lowercase_imported_as_non_lowercase(
+                                    stmt, name, asname,
+                                )
+                            {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N813) {
+                            if let Some(check) =
+                                pep8_naming::checks::camelcase_imported_as_lowercase(
+                                    stmt, name, asname,
+                                )
+                            {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N814) {
+                            if let Some(check) = pep8_naming::checks::camelcase_imported_as_constant(
+                                stmt, name, asname,
+                            ) {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N817) {
+                            if let Some(check) = pep8_naming::checks::camelcase_imported_as_acronym(
+                                stmt, name, asname,
+                            ) {
+                                self.checks.push(check);
+                            }
+                        }
+                    }
                }
            }
            StmtKind::ImportFrom {
@@ -412,8 +536,26 @@ where
                module,
                level,
            } => {
+                // Track `import from` statements, to ensure that we can correctly attribute
+                // references like `from typing import Union`.
+                if level.map(|level| level == 0).unwrap_or(true) {
+                    if let Some(module) = module {
+                        if TRACK_FROM_IMPORTS.contains(&module.as_str()) {
+                            self.from_imports
+                                .entry(module)
+                                .or_insert_with(BTreeSet::new)
+                                .extend(
+                                    names
+                                        .iter()
+                                        .filter(|alias| alias.node.asname.is_none())
+                                        .map(|alias| alias.node.name.as_str()),
+                                )
+                        }
+                    }
+                }
+
                if self.settings.enabled.contains(&CheckCode::E402) {
-                    if self.seen_import_boundary && stmt.location.column() == 1 {
+                    if self.seen_import_boundary && stmt.location.column() == 0 {
                        self.checks.push(Check::new(
                            CheckKind::ModuleImportNotAtTopOfFile,
                            self.locate_check(Range::from_located(stmt)),
@@ -525,14 +667,75 @@ where
                            },
                        )
                    }
+
+                    if let Some(asname) = &alias.node.asname {
+                        if self.settings.enabled.contains(&CheckCode::N811) {
+                            if let Some(check) =
+                                pep8_naming::checks::constant_imported_as_non_constant(
+                                    stmt,
+                                    &alias.node.name,
+                                    asname,
+                                )
+                            {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N812) {
+                            if let Some(check) =
+                                pep8_naming::checks::lowercase_imported_as_non_lowercase(
+                                    stmt,
+                                    &alias.node.name,
+                                    asname,
+                                )
+                            {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N813) {
+                            if let Some(check) =
+                                pep8_naming::checks::camelcase_imported_as_lowercase(
+                                    stmt,
+                                    &alias.node.name,
+                                    asname,
+                                )
+                            {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N814) {
+                            if let Some(check) = pep8_naming::checks::camelcase_imported_as_constant(
+                                stmt,
+                                &alias.node.name,
+                                asname,
+                            ) {
+                                self.checks.push(check);
+                            }
+                        }
+
+                        if self.settings.enabled.contains(&CheckCode::N817) {
+                            if let Some(check) = pep8_naming::checks::camelcase_imported_as_acronym(
+                                stmt,
+                                &alias.node.name,
+                                asname,
+                            ) {
+                                self.checks.push(check);
+                            }
+                        }
+                    }
                }
            }
            StmtKind::Raise { exc, .. } => {
                if self.settings.enabled.contains(&CheckCode::F901) {
                    if let Some(expr) = exc {
-                        if let Some(check) = pyflakes::checks::raise_not_implemented(expr) {
-                            self.checks.push(check);
-                        }
+                        pyflakes::plugins::raise_not_implemented(self, expr);
+                    }
+                }
+                if self.settings.enabled.contains(&CheckCode::B016) {
+                    if let Some(exc) = exc {
+                        flake8_bugbear::plugins::cannot_raise_literal(self, exc);
                    }
                }
            }
@@ -552,6 +755,16 @@ where
                    flake8_bugbear::plugins::assert_false(self, stmt, test, msg);
                }
            }
+            StmtKind::With { items, .. } | StmtKind::AsyncWith { items, .. } => {
+                if self.settings.enabled.contains(&CheckCode::B017) {
+                    flake8_bugbear::plugins::assert_raises_exception(self, stmt, items);
+                }
+            }
+            StmtKind::For { target, body, .. } => {
+                if self.settings.enabled.contains(&CheckCode::B007) {
+                    flake8_bugbear::plugins::unused_loop_control_variable(self, target, body);
+                }
+            }
            StmtKind::Try { handlers, .. } => {
                if self.settings.enabled.contains(&CheckCode::F707) {
                    if let Some(check) = pyflakes::checks::default_except_not_last(handlers) {
@@ -563,6 +776,9 @@ where
                {
                    flake8_bugbear::plugins::duplicate_exceptions(self, stmt, handlers);
                }
+                if self.settings.enabled.contains(&CheckCode::B013) {
+                    flake8_bugbear::plugins::redundant_tuple_in_exception_handler(self, handlers);
+                }
            }
            StmtKind::Assign { targets, value, .. } => {
                if self.settings.enabled.contains(&CheckCode::E731) {
@@ -576,6 +792,9 @@ where
                if self.settings.enabled.contains(&CheckCode::U001) {
                    pyupgrade::plugins::useless_metaclass_type(self, stmt, value, targets);
                }
+                if self.settings.enabled.contains(&CheckCode::B003) {
+                    flake8_bugbear::plugins::assignment_to_os_environ(self, targets);
+                }
            }
            StmtKind::AnnAssign { value, .. } => {
                if self.settings.enabled.contains(&CheckCode::E731) {
@@ -710,7 +929,7 @@ where
                    pyupgrade::plugins::use_pep604_annotation(self, expr, value, slice);
                }

-                if match_name_or_attr(value, "Literal") {
+                if self.match_typing_module(value, "Literal") {
                    self.in_literal = true;
                }
            }
@@ -735,6 +954,7 @@ where
                    // Ex) List[...]
                    if self.settings.enabled.contains(&CheckCode::U006)
                        && self.settings.target_version >= PythonVersion::Py39
+                        && typing::is_pep585_builtin(expr, self.from_imports.get("typing"))
                    {
                        pyupgrade::plugins::use_pep585_annotation(self, expr, id);
                    }
@@ -757,23 +977,19 @@ where
                }
                ExprContext::Del => self.handle_node_delete(expr),
            },
-            ExprKind::Attribute { value, attr, .. } => {
+            ExprKind::Attribute { attr, .. } => {
                // Ex) typing.List[...]
                if self.settings.enabled.contains(&CheckCode::U006)
                    && self.settings.target_version >= PythonVersion::Py39
+                    && typing::is_pep585_builtin(expr, self.from_imports.get("typing"))
                {
-                    if let ExprKind::Name { id, .. } = &value.node {
-                        if id == "typing" {
-                            pyupgrade::plugins::use_pep585_annotation(self, expr, attr);
-                        }
-                    }
+                    pyupgrade::plugins::use_pep585_annotation(self, expr, attr);
                }
            }
            ExprKind::Call {
                func,
                args,
                keywords,
-                ..
            } => {
                if self.settings.enabled.contains(&CheckCode::U005) {
                    pyupgrade::plugins::deprecated_unittest_alias(self, func);
@@ -793,25 +1009,43 @@ where

                // flake8-comprehensions
                if self.settings.enabled.contains(&CheckCode::C400) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_generator_list(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_generator_list(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C401) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_generator_set(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_generator_set(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C402) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_generator_dict(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_generator_dict(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }
@@ -819,7 +1053,13 @@ where
                if self.settings.enabled.contains(&CheckCode::C403) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_list_comprehension_set(
-                            expr, func, args,
+                            expr,
+                            func,
+                            args,
+                            keywords,
+                            self.locator,
+                            self.patch(),
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -829,7 +1069,10 @@ where
                if self.settings.enabled.contains(&CheckCode::C404) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_list_comprehension_dict(
-                            expr, func, args,
+                            func,
+                            args,
+                            keywords,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -837,24 +1080,42 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::C405) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_literal_set(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_literal_set(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C406) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_literal_dict(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_literal_dict(
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }

                if self.settings.enabled.contains(&CheckCode::C408) {
                    if let Some(check) = flake8_comprehensions::checks::unnecessary_collection_call(
-                        expr, func, args, keywords,
+                        expr,
+                        func,
+                        args,
+                        keywords,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
                    ) {
                        self.checks.push(check);
                    };
@@ -863,7 +1124,12 @@ where
                if self.settings.enabled.contains(&CheckCode::C409) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_literal_within_tuple_call(
-                            expr, func, args,
+                            expr,
+                            func,
+                            args,
+                            self.locator,
+                            self.patch(),
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -873,7 +1139,12 @@ where
                if self.settings.enabled.contains(&CheckCode::C410) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_literal_within_list_call(
-                            expr, func, args,
+                            expr,
+                            func,
+                            args,
+                            self.locator,
+                            self.patch(),
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -881,9 +1152,14 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::C411) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_list_call(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_list_call(
+                        expr,
+                        func,
+                        args,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }
@@ -891,7 +1167,9 @@ where
                if self.settings.enabled.contains(&CheckCode::C413) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_call_around_sorted(
-                            expr, func, args,
+                            func,
+                            args,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -901,7 +1179,9 @@ where
                if self.settings.enabled.contains(&CheckCode::C414) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_double_cast_or_process(
-                            expr, func, args,
+                            func,
+                            args,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -911,7 +1191,9 @@ where
                if self.settings.enabled.contains(&CheckCode::C415) {
                    if let Some(check) =
                        flake8_comprehensions::checks::unnecessary_subscript_reversal(
-                            expr, func, args,
+                            func,
+                            args,
+                            self.locate_check(Range::from_located(expr)),
                        )
                    {
                        self.checks.push(check);
@@ -919,9 +1201,11 @@ where
                }

                if self.settings.enabled.contains(&CheckCode::C417) {
-                    if let Some(check) =
-                        flake8_comprehensions::checks::unnecessary_map(expr, func, args)
-                    {
+                    if let Some(check) = flake8_comprehensions::checks::unnecessary_map(
+                        func,
+                        args,
+                        self.locate_check(Range::from_located(expr)),
+                    ) {
                        self.checks.push(check);
                    };
                }
@@ -1011,6 +1295,10 @@ where
                        self,
                    ));
                }
+
+                if self.settings.enabled.contains(&CheckCode::B002) {
+                    flake8_bugbear::plugins::unary_prefix_increment(self, expr, op, operand);
+                }
            }
            ExprKind::Compare {
                left,
@@ -1046,6 +1334,12 @@ where
                        self.locate_check(Range::from_located(expr)),
                    ));
                }
+
+                if self.settings.enabled.contains(&CheckCode::B015) {
+                    if let Some(parent) = self.parents.last() {
+                        flake8_bugbear::plugins::useless_comparison(self, left, parent);
+                    }
+                }
            }
            ExprKind::Constant {
                value: Constant::Str(value),
@@ -1094,7 +1388,12 @@ where
            ExprKind::ListComp { elt, generators } | ExprKind::SetComp { elt, generators } => {
                if self.settings.enabled.contains(&CheckCode::C416) {
                    if let Some(check) = flake8_comprehensions::checks::unnecessary_comprehension(
-                        expr, elt, generators,
+                        expr,
+                        elt,
+                        generators,
+                        self.locator,
+                        self.patch(),
+                        self.locate_check(Range::from_located(expr)),
                    ) {
                        self.checks.push(check);
                    };
@@ -1122,12 +1421,12 @@ where
                args,
                keywords,
            } => {
-                if match_name_or_attr(func, "ForwardRef") {
+                if self.match_typing_module(func, "ForwardRef") {
                    self.visit_expr(func);
                    for expr in args {
                        self.visit_annotation(expr);
                    }
-                } else if match_name_or_attr(func, "cast") {
+                } else if self.match_typing_module(func, "cast") {
                    self.visit_expr(func);
                    if !args.is_empty() {
                        self.visit_annotation(&args[0]);
@@ -1135,12 +1434,12 @@ where
                    for expr in args.iter().skip(1) {
                        self.visit_expr(expr);
                    }
-                } else if match_name_or_attr(func, "NewType") {
+                } else if self.match_typing_module(func, "NewType") {
                    self.visit_expr(func);
                    for expr in args.iter().skip(1) {
                        self.visit_annotation(expr);
                    }
-                } else if match_name_or_attr(func, "TypeVar") {
+                } else if self.match_typing_module(func, "TypeVar") {
                    self.visit_expr(func);
                    for expr in args.iter().skip(1) {
                        self.visit_annotation(expr);
@@ -1157,7 +1456,7 @@ where
                            }
                        }
                    }
-                } else if match_name_or_attr(func, "NamedTuple") {
+                } else if self.match_typing_module(func, "NamedTuple") {
                    self.visit_expr(func);

                    // Ex) NamedTuple("a", [("a", int)])
@@ -1189,7 +1488,7 @@ where
                        let KeywordData { value, .. } = &keyword.node;
                        self.visit_annotation(value);
                    }
-                } else if match_name_or_attr(func, "TypedDict") {
+                } else if self.match_typing_module(func, "TypedDict") {
                    self.visit_expr(func);

                    // Ex) TypedDict("a", {"a": int})
@@ -1216,36 +1515,56 @@ where
                }
            }
            ExprKind::Subscript { value, slice, ctx } => {
-                match helpers::match_annotated_subscript(value) {
-                    Some(subscript) => match subscript {
-                        // Ex) Optional[int]
-                        SubscriptKind::AnnotatedSubscript => {
-                            self.visit_expr(value);
-                            self.visit_annotation(slice);
-                            self.visit_expr_context(ctx);
-                        }
-                        // Ex) Annotated[int, "Hello, world!"]
-                        SubscriptKind::PEP593AnnotatedSubscript => {
-                            // First argument is a type (including forward references); the rest are
-                            // arbitrary Python objects.
-                            self.visit_expr(value);
-                            if let ExprKind::Tuple { elts, ctx } = &slice.node {
-                                if let Some(expr) = elts.first() {
-                                    self.visit_expr(expr);
-                                    self.in_annotation = false;
-                                    for expr in elts.iter().skip(1) {
-                                        self.visit_expr(expr);
-                                    }
-                                    self.in_annotation = true;
+                // Only allow annotations in `ExprContext::Load`. If we have, e.g.,
+                // `obj["foo"]["bar"]`, we need to avoid treating the `obj["foo"]`
+                // portion as an annotation, despite having `ExprContext::Load`. Thus, we track
+                // the `ExprContext` at the top-level.
+                let prev_in_subscript = self.in_subscript;
+                if self.in_subscript {
+                    visitor::walk_expr(self, expr);
+                } else if matches!(ctx, ExprContext::Store | ExprContext::Del) {
+                    self.in_subscript = true;
+                    visitor::walk_expr(self, expr);
+                } else {
+                    self.in_subscript = true;
+                    match typing::match_annotated_subscript(value, &self.from_imports) {
+                        Some(subscript) => {
+                            match subscript {
+                                // Ex) Optional[int]
+                                SubscriptKind::AnnotatedSubscript => {
+                                    self.visit_expr(value);
+                                    self.visit_annotation(slice);
                                    self.visit_expr_context(ctx);
                                }
-                            } else {
-                                error!("Found non-ExprKind::Tuple argument to PEP 593 Annotation.")
+                                // Ex) Annotated[int, "Hello, world!"]
+                                SubscriptKind::PEP593AnnotatedSubscript => {
+                                    // First argument is a type (including forward references); the
+                                    // rest are arbitrary Python
+                                    // objects.
+                                    self.visit_expr(value);
+                                    if let ExprKind::Tuple { elts, ctx } = &slice.node {
+                                        if let Some(expr) = elts.first() {
+                                            self.visit_expr(expr);
+                                            self.in_annotation = false;
+                                            for expr in elts.iter().skip(1) {
+                                                self.visit_expr(expr);
+                                            }
+                                            self.in_annotation = true;
+                                            self.visit_expr_context(ctx);
+                                        }
+                                    } else {
+                                        error!(
+                                            "Found non-ExprKind::Tuple argument to PEP 593 \
+                                             Annotation."
+                                        )
+                                    }
+                                }
                            }
                        }
-                    },
-                    None => visitor::walk_expr(self, expr),
+                        None => visitor::walk_expr(self, expr),
+                    }
                }
+                self.in_subscript = prev_in_subscript;
            }
            _ => visitor::walk_expr(self, expr),
        }
@@ -1349,8 +1668,15 @@ where
            self.checks
                .extend(pyflakes::checks::duplicate_arguments(arguments));
        }
+        if self.settings.enabled.contains(&CheckCode::B006) {
+            flake8_bugbear::plugins::mutable_argument_default(self, arguments)
+        }
+        if self.settings.enabled.contains(&CheckCode::B008) {
+            flake8_bugbear::plugins::function_call_argument_default(self, arguments)
+        }

-        // Bind, but intentionally avoid walking default expressions, as we handle them upstream.
+        // Bind, but intentionally avoid walking default expressions, as we handle them
+        // upstream.
        for arg in &arguments.posonlyargs {
            self.visit_arg(arg);
        }
@@ -1369,7 +1695,8 @@ where
    }

    fn visit_arg(&mut self, arg: &'b Arg) {
-        // Bind, but intentionally avoid walking the annotation, as we handle it upstream.
+        // Bind, but intentionally avoid walking the annotation, as we handle it
+        // upstream.
        self.add_binding(
            arg.node.arg.to_string(),
            Binding {
@@ -1411,8 +1738,9 @@ fn try_mark_used(scope: &mut Scope, scope_id: usize, id: &str, expr: &Expr) -> b
        // Mark the binding as used.
        binding.used = Some((scope_id, Range::from_located(expr)));

-        // If the name of the sub-importation is the same as an alias of another importation and the
-        // alias is used, that sub-importation should be marked as used too.
+        // If the name of the sub-importation is the same as an alias of another
+        // importation and the alias is used, that sub-importation should be
+        // marked as used too.
        //
        // This handles code like:
        //   import pyarrow as pa
@@ -1522,7 +1850,8 @@ impl<'a> Checker<'a> {
    fn add_binding(&mut self, name: String, binding: Binding) {
        let scope = &mut self.scopes[*(self.scope_stack.last().expect("No current scope found."))];

-        // TODO(charlie): Don't treat annotations as assignments if there is an existing value.
+        // TODO(charlie): Don't treat annotations as assignments if there is an existing
+        // value.
        let binding = match scope.values.get(&name) {
            None => binding,
            Some(existing) => {
@@ -1652,6 +1981,30 @@ impl<'a> Checker<'a> {
                }
            }

+            if self.settings.enabled.contains(&CheckCode::N806) {
+                if let Some(check) =
+                    pep8_naming::checks::non_lowercase_variable_in_function(current, expr, id)
+                {
+                    self.checks.push(check);
+                }
+            }
+
+            if self.settings.enabled.contains(&CheckCode::N815) {
+                if let Some(check) =
+                    pep8_naming::checks::mixed_case_variable_in_class_scope(current, expr, id)
+                {
+                    self.checks.push(check);
+                }
+            }
+
+            if self.settings.enabled.contains(&CheckCode::N816) {
+                if let Some(check) =
+                    pep8_naming::checks::mixed_case_variable_in_global_scope(current, expr, id)
+                {
+                    self.checks.push(check);
+                }
+            }
+
            if matches!(parent.node, StmtKind::AnnAssign { value: None, .. }) {
                self.add_binding(
                    id.to_string(),
@@ -1946,8 +2299,7 @@ impl<'a> Checker<'a> {
                    let child = self.parents[defined_by];
                    let parent = defined_in.map(|defined_in| self.parents[defined_in]);

-                    let fix = if matches!(self.autofix, fixer::Mode::Generate | fixer::Mode::Apply)
-                    {
+                    let fix = if self.patch() {
                        let deleted: Vec<&Stmt> = self
                            .deletions
                            .iter()
@@ -1959,7 +2311,7 @@ impl<'a> Checker<'a> {
                            ImportKind::ImportFrom => pyflakes::fixes::remove_unused_import_froms,
                        };

-                        match removal_fn(&mut self.locator, &full_names, child, parent, &deleted) {
+                        match removal_fn(self.locator, &full_names, child, parent, &deleted) {
                            Ok(fix) => Some(fix),
                            Err(e) => {
                                error!("Failed to fix unused imports: {}", e);
@@ -1970,15 +2322,27 @@ impl<'a> Checker<'a> {
                        None
                    };

-                    let mut check = Check::new(
-                        CheckKind::UnusedImport(full_names.into_iter().map(String::from).collect()),
-                        self.locate_check(Range::from_located(child)),
-                    );
-                    if let Some(fix) = fix {
-                        check.amend(fix);
+                    if self.path.ends_with("__init__.py") {
+                        self.checks.push(Check::new(
+                            CheckKind::UnusedImport(
+                                full_names.into_iter().map(String::from).collect(),
+                                true,
+                            ),
+                            self.locate_check(Range::from_located(child)),
+                        ));
+                    } else {
+                        let mut check = Check::new(
+                            CheckKind::UnusedImport(
+                                full_names.into_iter().map(String::from).collect(),
+                                false,
+                            ),
+                            self.locate_check(Range::from_located(child)),
+                        );
+                        if let Some(fix) = fix {
+                            check.amend(fix);
+                        }
+                        self.checks.push(check);
                    }
-
-                    self.checks.push(check);
                }
            }
        }
@@ -2107,12 +2471,12 @@ impl<'a> Checker<'a> {

 pub fn check_ast(
    python_ast: &Suite,
-    contents: &str,
+    locator: &SourceCodeLocator,
    settings: &Settings,
    autofix: &fixer::Mode,
    path: &Path,
 ) -> Vec<Check> {
-    let mut checker = Checker::new(settings, autofix, path, contents);
+    let mut checker = Checker::new(settings, autofix, path, locator);
    checker.push_scope(Scope::new(ScopeKind::Module));
    checker.bind_builtins();

--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Charlie Marsh	22cfd03b13	Bump ruff_dev to v0.0.103	2022-11-05 19:53:27 -04:00
Charlie Marsh	3ae408a364	Only track noqa directives for multi-line strings (#615 )	2022-11-05 19:53:13 -04:00
Anders Kaseorg	95073b1586	Fix “Code” misspelling (#614 )	2022-11-05 19:28:52 -04:00
Charlie Marsh	3597a94818	Add a README link to each plugin (#611 )	2022-11-05 16:18:27 -04:00
Charlie Marsh	2727e5f3b7	Remove some usages of Ruff internals in ruff_dev (#610 )	2022-11-05 16:07:21 -04:00
Charlie Marsh	de53b567f5	Add a list of projects using Ruff (#608 )	2022-11-05 16:03:10 -04:00
Charlie Marsh	21479a151d	Bump ruff_dev to v0.0.102	2022-11-05 16:00:24 -04:00
Charlie Marsh	d822458d97	Fix reference to src/checks_gen.rs	2022-11-05 15:59:51 -04:00
Charlie Marsh	6741ea9790	Create a separate dev crate for development scripts (#607 )	2022-11-05 15:59:18 -04:00
Charlie Marsh	2e1799dd80	Automatically update README.md from generate_rules_table.rs (#606 )	2022-11-05 15:33:47 -04:00
Reiner Gerecke	c48c7669a8	Remove rust version from CONTRIBUTING.md (#605 )	2022-11-05 15:03:10 -04:00
Charlie Marsh	d5fbcd708d	Automatically write to src/checks_gen.rs (#604 )	2022-11-05 14:30:18 -04:00
Charlie Marsh	b335a6a5ec	Bump version to 0.0.102	2022-11-05 14:13:02 -04:00
Charlie Marsh	f5cbee452a	Increase flake8-bugbear count to 15/32	2022-11-05 14:12:35 -04:00
Harutaka Kawamura	5d1ea4410a	Ignore ellipsis in B018 (#598 )	2022-11-05 14:11:44 -04:00
Harutaka Kawamura	f27163d2c7	Remove needless return (#597 )	2022-11-05 14:11:26 -04:00
Harutaka Kawamura	62c126f70e	Implement B003 (#596 )	2022-11-05 14:08:02 -04:00
Harutaka Kawamura	8344d5151c	Implement B016 (#595 )	2022-11-05 14:06:00 -04:00
Harutaka Kawamura	f7780eb720	Implement B008 (#594 )	2022-11-05 14:05:04 -04:00
Charlie Marsh	c544d84b46	Rely on token locations for noqa map extraction (#603 )	2022-11-05 10:51:19 -04:00
Charlie Marsh	fbdc075e5c	Change Ruff's error prefix to RUF (#592 )	2022-11-04 23:13:50 -04:00
Charlie Marsh	d3472104d0	Bump flake8-bugbear count to 12/32	2022-11-04 14:49:14 -04:00
Charlie Marsh	0c8b981216	Bump version to 0.0.101	2022-11-04 14:46:48 -04:00
Charlie Marsh	0e3f08aa68	Split ambiguous unicode detection into string vs. docstring rules (#590 )	2022-11-04 14:46:20 -04:00
Charlie Marsh	a75b1c85ee	Fix invalid escape handling for CRLF files (#589 )	2022-11-04 14:26:39 -04:00
Harutaka Kawamura	726e6c68cf	Implement B015 (#587 )	2022-11-04 13:47:52 -04:00
Charlie Marsh	34c91224d7	Bump version to 0.0.100	2022-11-04 12:10:17 -04:00
Charlie Marsh	50c4bbc52b	Implement ambiguous unicode character detection (#578 )	2022-11-04 12:08:26 -04:00
Charlie Marsh	f0239de559	Use a shared Rope between AST checker and fixer (#585 )	2022-11-04 12:05:46 -04:00
Charlie Marsh	2be632f3cc	Use a Rope to power fixer (#584 )	2022-11-04 12:04:14 -04:00
Harutaka Kawamura	ec3fed5a61	Implement B018 (#582 )	2022-11-04 10:53:30 -04:00
Charlie Marsh	1da44485d5	Confine subscript annotation checks to `ExprContext::Load` (#583 )	2022-11-04 10:51:05 -04:00
Charlie Marsh	e5f30ff5a8	Use a rope to manage string slicing (#576 )	2022-11-03 23:23:38 -04:00
Charlie Marsh	c92f5c14a3	Bump Rust version to 1.65.0 (#575 )	2022-11-03 22:49:21 -04:00
Charlie Marsh	2f92399f4e	Add W to list of default flake8-to-ruff codes (#574 )	2022-11-03 22:13:00 -04:00
Charlie Marsh	83dfb5fe8b	Infer Flake8 plugins from .flake8 config (#573 )	2022-11-03 22:05:46 -04:00
Charlie Marsh	cc915371ca	Implement autofix for F901 (#571 )	2022-11-03 11:58:54 -04:00
Charlie Marsh	5576db3d5a	Bump version to 0.0.99	2022-11-03 11:47:15 -04:00
Charlie Marsh	f26f38d023	Enable autofix for C406 (#570 )	2022-11-03 11:27:46 -04:00
Charlie Marsh	578ec4d843	Implement autofix for C416 (#568 )	2022-11-03 11:05:08 -04:00
Charlie Marsh	2f3bebe5a2	Enable autofix for dict(a=1)-like dictionaries (#567 )	2022-11-03 10:42:54 -04:00
Charlie Marsh	22991e3e0e	Bump version to 0.0.98	2022-11-03 10:09:33 -04:00
Charlie Marsh	242bdf86b1	Use ::ruff to ensure ruff imports come first	2022-11-03 10:09:28 -04:00
Charlie Marsh	a3f7de2257	Make --quiet more aggressive (#566 )	2022-11-03 10:08:15 -04:00
Charlie Marsh	9f9cbb5520	Improve pyproject.toml examples in README.md	2022-11-03 09:33:17 -04:00
Charlie Marsh	937c83d57f	Remove crates subdirectory (#563 )	2022-11-03 09:19:54 -04:00
Charlie Marsh	e00bcd19f5	Bump version to 0.0.97	2022-11-02 22:38:43 -04:00
Charlie Marsh	4550581be2	Relax lowercase condition in N806 (#562 )	2022-11-02 22:38:29 -04:00
Charlie Marsh	b42d77a4c6	Avoid autofixes for errors in f-strings (#561 )	2022-11-02 22:31:57 -04:00
Charlie Marsh	e473df1fe9	Bump version to 0.0.96	2022-11-02 22:10:56 -04:00
Charlie Marsh	d448281b33	Add plugin properties to settings cache key (#559 )	2022-11-02 22:10:01 -04:00
Charlie Marsh	94597fefc1	Change flake8-quotes default to double quotes (#558 )	2022-11-02 22:03:54 -04:00
Charlie Marsh	add0bdeeb7	DRY up utilities in flake8_comprehensions/fixes.rs (#556 )	2022-11-02 22:00:53 -04:00
Charlie Marsh	6a180b95d1	Implement autofix for dict and tuple comprehensions (#555 )	2022-11-02 21:36:20 -04:00
Charlie Marsh	416c338237	Respect trailing whitespace in comprehension fixes (#554 )	2022-11-02 21:08:17 -04:00
Charlie Marsh	9948be0145	Automatically fix a variety of comprehension rules (#553 )	2022-11-02 20:39:35 -04:00
Charlie Marsh	f50ff61056	Expose autofix mode in public API (#551 )	2022-11-02 09:44:46 -04:00
Charlie Marsh	017fec2bc5	Set override in actions-rs/toolchain@v1 (#543 )	2022-11-02 09:36:22 -04:00
Charlie Marsh	f9def0a139	Bump version to 0.0.95	2022-11-02 09:03:34 -04:00
StefanBRas	d4fc485a76	Update README.md to use table for per-file-ignore (#549 )	2022-11-02 09:02:11 -04:00
Charlie Marsh	0827d0beef	Account for typing_extensions for annotation parsing (#550 )	2022-11-02 09:01:12 -04:00
Charlie Marsh	b4a46ab6f0	Add tests for converter.rs (#542 )	2022-11-01 22:36:08 -04:00
Charlie Marsh	f6e14edc3e	Use max-line-length in converter.rs (#541 )	2022-11-01 22:27:13 -04:00
Charlie Marsh	878a94f9cb	Add a rust-toolchain.toml file (#538 )	2022-11-01 20:34:58 -04:00
Charlie Marsh	79ca66ace5	Use nightly rustfmt with rustfmt.toml (#536 )	2022-11-01 20:34:38 -04:00
fsouza	c68c6b5424	Make columns indices 1-based in the text output format (#539 )	2022-11-01 19:06:08 -04:00
Charlie Marsh	bad5723d80	Add plugin configuration to flake8-to-ruff (#535 )	2022-11-01 17:08:53 -04:00
Charlie Marsh	2d83f99dbf	Bump version to 0.0.94	2022-11-01 16:38:59 -04:00
Charlie Marsh	5123b38758	Refine list of annotatable subscripts (#534 )	2022-11-01 16:36:05 -04:00
Charlie Marsh	e9a4c8ba13	Track typing module imports (#533 )	2022-11-01 14:01:59 -04:00
Charlie Marsh	927d716edd	Enable flake8-to-ruff builds on all platforms	2022-11-01 12:15:43 -04:00
Charlie Marsh	df6a48fced	Use separate tokens for each PyPI release	2022-10-31 22:43:38 -04:00
Charlie Marsh	91a8277ac0	Always release flake8-to-ruff	2022-10-31 22:16:28 -04:00
Charlie Marsh	5797884262	Represent per-file ignores as a map (#531 )	2022-10-31 22:15:33 -04:00
Charlie Marsh	5aa8455258	Misc. improvements to flake8-to-ruff	2022-10-31 18:38:47 -04:00
Charlie Marsh	8fd713739b	Use pretty-print for flake8-to-ruff	2022-10-31 17:52:03 -04:00
Charlie Marsh	5de1fcd653	Add to flake8-to-ruff README	2022-10-31 17:50:32 -04:00
Charlie Marsh	032f4f3f12	Set maturin path when building flake8-to-ruff	2022-10-31 16:49:45 -04:00
Charlie Marsh	621db96e7f	Use more consistent Option in pyproject settings (#530 )	2022-10-31 16:34:58 -04:00
Charlie Marsh	05867ef260	Set flake8-to-ruff release to workflow_dispatch	2022-10-31 16:25:09 -04:00
Charlie Marsh	0cd8b75f06	Rename release.yaml files	2022-10-31 16:23:52 -04:00
Charlie Marsh	5f07e1d6b5	Fix release.yaml task names	2022-10-31 16:22:25 -04:00
Charlie Marsh	1ce4585c88	Add a separate release job for flake8-to-ruff (#529 )	2022-10-31 16:21:38 -04:00
Charlie Marsh	f3f010cdf5	Move flake8-to-ruff to a separate crate (#528 )	2022-10-31 14:22:07 -04:00
Charlie Marsh	7e5e03fb15	Add a Flake8-to-Ruff configuration conversion tool (#527 )	2022-10-31 11:34:40 -04:00
Charlie Marsh	062c41b6f5	Bump version to 0.0.93	2022-10-31 09:20:39 -04:00
Charlie Marsh	78889efa37	Modify public API to return Check rather than Message (#524 )	2022-10-31 09:20:14 -04:00
Charlie Marsh	97fc281779	Remove erroneous foo.py file	2022-10-30 19:19:49 -04:00
Charlie Marsh	138b06c98a	Bump version to 0.0.92	2022-10-30 18:04:30 -04:00
Charlie Marsh	2415d73260	Remove RustPython fork (#523 )	2022-10-30 18:04:05 -04:00
Charlie Marsh	b060ae2f22	Move SourceCodeLocator to its own module (#522 )	2022-10-30 15:51:59 -04:00
Charlie Marsh	9aa91d3d3c	Add a cargo bench for SourceCodeLocator (#521 )	2022-10-30 13:50:42 -04:00
Charlie Marsh	dcedb801e5	Tweak a few check messages (#520 )	2022-10-30 13:13:37 -04:00
Charlie Marsh	d3e7fdabb5	Implement consistent newline handling for SourceCodeLocator (#519 )	2022-10-30 13:11:08 -04:00
Charlie Marsh	dfa5a4f0f7	Fix 9/32 flake8-bugbear reference	2022-10-30 13:03:39 -04:00
Charlie Marsh	58a2d600da	Avoid flagging D202 for inner functions and classes (#518 )	2022-10-30 13:02:55 -04:00
Harutaka Kawamura	7ecbfe4f6a	Implement B006 (#515 )	2022-10-30 12:57:57 -04:00
Charlie Marsh	d8248104a7	Avoid re-indenting empty lines in D207 (#517 )	2022-10-30 09:41:54 -04:00
Charlie Marsh	6eb09122c0	Add final newline in SourceCodeLocator	2022-10-29 19:23:16 -04:00
Charlie Marsh	f84c1f1fa1	Bump version to 0.0.91	2022-10-29 18:49:26 -04:00
Charlie Marsh	3aa9528229	Avoid flake8-comprehensions errors for dicts with kwargs (#512 )	2022-10-29 18:49:06 -04:00
Charlie Marsh	5a3f06bab1	Bump version to 0.0.90	2022-10-29 18:34:38 -04:00
Charlie Marsh	db59d5b558	Use a single SourceCodeLocator everywhere (#510 )	2022-10-29 18:23:24 -04:00
Charlie Marsh	2fcbf3ab62	Simplify SourceCodeLocator offset computation (#509 )	2022-10-29 18:13:42 -04:00
Anders Kaseorg	fa9b10be72	Remove leading space from C416 message (#508 )	2022-10-29 17:40:50 -04:00
Charlie Marsh	c495cef529	Move pyproject.toml logging to debug (#506 )	2022-10-29 17:07:46 -04:00
Charlie Marsh	c0c8dff6ce	Implement configuration options for pep8-naming (#505 )	2022-10-29 17:00:30 -04:00
Charlie Marsh	80b00cc89f	Add error code categories to table of contents (#504 )	2022-10-29 16:39:55 -04:00
Charlie Marsh	934db3d179	Bump version to 0.0.89	2022-10-29 15:39:17 -04:00
Charlie Marsh	6a040a0405	Update checks_gen.rs	2022-10-29 15:39:02 -04:00
Harutaka Kawamura	2821ef0f69	Implement B013 (#503 )	2022-10-29 15:36:29 -04:00
Harutaka Kawamura	343d931ddb	Ignore unittest methods and functions in N802 (#502 )	2022-10-29 15:36:09 -04:00
Harutaka Kawamura	3fc257f71b	Implement N806, 815, 816, 818 (#501 )	2022-10-29 15:35:56 -04:00
Charlie Marsh	6dbb0a17e9	Update README to reflect selection groups	2022-10-28 19:15:46 -04:00
Charlie Marsh	ae5ad6a4ac	Bump version to 0.0.88	2022-10-28 19:11:04 -04:00
Charlie Marsh	549af6c584	Regenerate CheckCodePrefix	2022-10-28 19:10:45 -04:00
Charlie Marsh	9a799eb4e6	Bump version to 0.0.87	2022-10-28 19:00:03 -04:00
Anders Kaseorg	f260b873b6	Fix “not a char boundary” error with Unicode in extract_quote (#497 )	2022-10-28 18:59:12 -04:00
Charlie Marsh	782a90b584	Add tests for resolve_codes (#498 )	2022-10-28 18:58:46 -04:00
Charlie Marsh	7df903dc4d	Move around and rename some of the Settings structs (#496 )	2022-10-28 18:46:54 -04:00
Charlie Marsh	8fc5e91ec7	Enable prefix-based check code selection (#493 )	2022-10-28 18:19:57 -04:00
Charlie Marsh	9ca1a2c273	Fix failing pyproject.toml test	2022-10-28 18:13:07 -04:00
Charlie Marsh	86265c1d7c	Implement the `flake8-quotes` plugin (#495 )	2022-10-28 17:52:11 -04:00
Charlie Marsh	a057c9a323	Move invalid_escape_sequence into pycodestyle (#494 )	2022-10-28 12:20:11 -04:00
Trevor Gross	2e63bb6dcb	Update hook id in README and in .pre-commit-config.yaml (#492 )	2022-10-27 17:32:52 -04:00
Charlie Marsh	1b5db80b32	Update pre-commit invocation in README.md	2022-10-27 17:19:22 -04:00
Charlie Marsh	3f20cea402	Bump version to 0.0.86	2022-10-27 13:09:57 -04:00
Charlie Marsh	389fe1ff64	Avoid auto-fixing unused imports in __init__.py (#489 )	2022-10-27 13:08:04 -04:00
Charlie Marsh	bad2d7ba85	Add example of per-file ignores to the README (#488 )	2022-10-27 12:58:52 -04:00
Charlie Marsh	416aa298ac	Allow whitespace in per-file ignore patterns (#487 )	2022-10-27 12:55:28 -04:00
Charlie Marsh	a535b1adbf	Replace compliance comments with check codes (#485 )	2022-10-27 09:32:18 -04:00
Charlie Marsh	05fbd1a283	Bump version to 0.0.85	2022-10-26 19:13:04 -04:00
Charlie Marsh	63552cbc8e	Implement W605 (invalid escape sequence) (#482 )	2022-10-26 19:10:24 -04:00
Charlie Marsh	c00bd489f1	Fix multi-segment import removal (#480 )	2022-10-26 16:43:55 -04:00
Charlie Marsh	16c2e3a995	Handle multi-segment import-from removal (#479 )	2022-10-26 16:36:12 -04:00
Anders Kaseorg	650b025181	Suppress “No pyproject.toml found” message with --quiet (#478 )	2022-10-26 16:03:25 -04:00
Anders Kaseorg	8fe46f7400	Rename --quiet to --silent and make --quiet only log errors (#477 )	2022-10-26 16:03:10 -04:00
Charlie Marsh	a9bcc15797	Bump version to 0.0.84	2022-10-26 12:01:55 -04:00
Charlie Marsh	b6c856bd07	Implement B007 (unused loop control variable) (#473 )	2022-10-26 12:01:27 -04:00
Charlie Marsh	4beea0484a	Use lazy initialization for SourceCodeLocator (#472 )	2022-10-26 11:27:48 -04:00
Suguru Yamamoto	2679db1d10	Correct EOL offset for lines ending with multi-byte char (#471 )	2022-10-26 11:00:27 -04:00
Charlie Marsh	3e73462e04	Optimize imports	2022-10-25 22:06:51 -04:00
Charlie Marsh	f63a87737a	DRY up usages of matches with fixer Mode (#470 )	2022-10-25 22:02:58 -04:00
Charlie Marsh	e7472eac1c	Increment flake8-bugbear to 8/32	2022-10-25 21:54:00 -04:00
Charlie Marsh	db3c847771	Bump version to 0.0.83	2022-10-25 21:24:13 -04:00
Charlie Marsh	4adbfc24a5	Increment flake8-bugbear to 6/32	2022-10-25 21:23:13 -04:00
Charlie Marsh	8f734a6562	Implement B002 (unary prefix increment) (#468 )	2022-10-25 21:10:51 -04:00
Charlie Marsh	bcf7519eb3	Implement B017 (no assertRaises(Exception)) (#467 )	2022-10-25 20:55:00 -04:00
Heyward Fann	66089052ee	chore: typo on #283 link (#464 )	2022-10-25 08:02:11 -04:00
Jeong YunWon	d50cc8ff65	Restyle flake8_comprehensions::check to reduce indent (#462 )	2022-10-24 15:16:56 -04:00
Harutaka Kawamura	b75ea94f58	Fix uppercase and lowercase check (#461 )	2022-10-22 12:49:13 -04:00
Harutaka Kawamura	2c24e2fd28	Enable N811, 812, 813, 814, 817 for `Import` (#460 )	2022-10-22 08:31:02 -04:00
Charlie Marsh	f8dc208665	Tweak messages for pep8-naming rules	2022-10-21 17:06:16 -04:00
Charlie Marsh	c72b8e8d1e	Bump version to 0.0.82	2022-10-21 12:15:19 -04:00
Harutaka Kawamura	b108c693fa	Implement N811, 812, 813, 814, and 817 (#457 )	2022-10-20 12:20:44 -04:00
Harutaka Kawamura	aac1912ea7	Implement N807 (#456 )	2022-10-20 11:12:02 -04:00
Charlie Marsh	3dcd26aac3	Add SectionUnderlineAfterName to autofix list	2022-10-17 22:08:49 -04:00
				`@@ -0,0 +1 @@`
				`this_should_not_be_linted = "double quote string" # noqa`
				`@@ -0,0 +1 @@`
				`this_should_not_be_linted = 'single quote string' # noqa`