Bump version to 0.0.29

Upgrade RustPython to handle AnnAssign (#117 )
Handle E731 in type-annotated assignment (#116 )
2022-09-06 22:14:12 -04:00 · 2022-09-06 20:53:51 -04:00 · 2022-09-06 20:18:46 -04:00 · 2022-09-06 20:18:05 -04:00 · 2022-09-06 14:20:02 -04:00 · 2022-09-06 14:19:38 -04:00
61 changed files with 3357 additions and 687 deletions
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -2,16 +2,16 @@ name: CI

 on:
  push:
-    branches: [ main ]
+    branches: [main]
  pull_request:
-    branches: [ main ]
+    branches: [main]

 jobs:
  cargo_build:
    name: "cargo build"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -33,7 +33,7 @@ jobs:
    name: "cargo fmt"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -55,7 +55,7 @@ jobs:
    name: "cargo clippy"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -77,7 +77,7 @@ jobs:
    name: "cargo test"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
@@ -99,13 +99,13 @@ jobs:
    name: "maturin build"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
      - uses: actions/setup-python@v4
        with:
-          python-version: '3.10'
+          python-version: "3.10"
      - run: pip install maturin
      - uses: actions/cache@v3
        env:
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -1,7 +1,8 @@
 name: Release

 on:
-  push:
+  pull_request:
+    branches: [main]
  create:
    tags:
      - v*
@@ -128,7 +129,7 @@ jobs:
        with:
          target: ${{ matrix.target }}
          manylinux: auto
-          args: --release --out dist
+          args: --no-default-features --release --out dist
          maturin-version: "v0.13.0"
      - uses: uraimo/run-on-arch-action@v2.0.5
        if: matrix.target != 'ppc64'
@@ -228,9 +229,9 @@ jobs:
        os: [ubuntu-latest, macos-latest]
        target: [x86_64, aarch64]
        python-version:
-          - '3.7'
-          - '3.8'
-          - '3.9'
+          - "3.7"
+          - "3.8"
+          - "3.9"
        exclude:
          - os: macos-latest
            target: aarch64
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 # Local cache
-.cache
+.ruff_cache
 resources/test/cpython

 ###
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,5 @@
+repos:
+  - repo: https://github.com/charliermarsh/ruff
+    rev: v0.0.29
+    hooks:
+      - id: lint
--- a/.pre-commit-hooks.yaml
+++ b/.pre-commit-hooks.yaml
@@ -0,0 +1,7 @@
+- id: lint
+  name: ruff lint
+  description: Run ruff to lint Python files.
+  entry: ruff
+  language: python
+  types_or: [python]
+  pass_filenames: true
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3

+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "ahash"
 version = "0.7.6"
@@ -197,6 +203,12 @@ dependencies = [
 "byteorder",
 ]

+[[package]]
+name = "base64"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -362,6 +374,12 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "chunked_transfer"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"
+
 [[package]]
 name = "clap"
 version = "3.2.16"
@@ -465,6 +483,15 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "crc32fast"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+dependencies = [
+ "cfg-if 1.0.0",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.6"
@@ -550,6 +577,15 @@ dependencies = [
 "generic-array 0.14.6",
 ]

+[[package]]
+name = "directories"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f51c5d4ddabd36886dd3e1438cb358cdcb0d7c499cb99cb4ac2e38e18b5cb210"
+dependencies = [
+ "dirs-sys",
+]
+
 [[package]]
 name = "dirs"
 version = "2.0.2"
@@ -664,12 +700,32 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"

+[[package]]
+name = "flate2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f82b0f4c27ad9f8bfd1f3208d882da2b09c301bc1c828fd3a00d0216d2fbbff6"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"

+[[package]]
+name = "form_urlencoded"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fc25a87fa4fd2094bffb06925852034d90a17f0d1e05197d4956d3555752191"
+dependencies = [
+ "matches",
+ "percent-encoding",
+]
+
 [[package]]
 name = "fsevent"
 version = "0.4.0"
@@ -850,6 +906,12 @@ dependencies = [
 "wasi 0.11.0+wasi-snapshot-preview1",
 ]

+[[package]]
+name = "glob"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
+
 [[package]]
 name = "gloo-timers"
 version = "0.2.4"
@@ -908,6 +970,17 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "idna"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418a0a6fab821475f634efe3ccc45c013f742efe03d853e8d3355d5cb850ecf8"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.1"
@@ -1078,6 +1151,12 @@ dependencies = [
 "twox-hash",
 ]

+[[package]]
+name = "matches"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -1102,6 +1181,15 @@ dependencies = [
 "autocfg",
 ]

+[[package]]
+name = "miniz_oxide"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f5c75688da582b8ffc1f1799e9db273f32133c49e048f614d22ec3256773ccc"
+dependencies = [
+ "adler",
+]
+
 [[package]]
 name = "mio"
 version = "0.6.23"
@@ -1254,9 +1342,9 @@ dependencies = [

 [[package]]
 name = "once_cell"
-version = "1.13.0"
+version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18a6dbe30758c9f83eb00cbea4ac95966305f5a7772f3f42ebfc7fc7eddbd8e1"
+checksum = "074864da206b4973b84eb91683020dbefd6a8c3f0f38e054d93954e891935e4e"

 [[package]]
 name = "opaque-debug"
@@ -1305,6 +1393,12 @@ dependencies = [
 "windows-sys",
 ]

+[[package]]
+name = "percent-encoding"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
+
 [[package]]
 name = "petgraph"
 version = "0.6.2"
@@ -1633,9 +1727,24 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "ring"
+version = "0.16.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3053cf52e236a3ed746dfc745aa9cacf1b791d846bdaf412f60a8d7d6e17c8fc"
+dependencies = [
+ "cc",
+ "libc",
+ "once_cell",
+ "spin",
+ "untrusted",
+ "web-sys",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "ruff"
-version = "0.0.20"
+version = "0.0.29"
 dependencies = [
 "anyhow",
 "bincode",
@@ -1648,21 +1757,37 @@ dependencies = [
 "dirs 4.0.0",
 "fern",
 "filetime",
+ "glob",
+ "itertools",
 "log",
 "notify",
+ "once_cell",
 "rayon",
 "regex",
 "rustpython-parser",
 "serde",
 "serde_json",
 "toml",
+ "update-informer",
 "walkdir",
 ]

+[[package]]
+name = "rustls"
+version = "0.20.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5aab8ee6c7097ed6057f43c187a62418d0c05a4bd5f18b3571db50ee0f9ce033"
+dependencies = [
+ "log",
+ "ring",
+ "sct",
+ "webpki",
+]
+
 [[package]]
 name = "rustpython-ast"
 version = "0.1.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=97a9d9de687227595932d6c8a04014dcfc892ff4#97a9d9de687227595932d6c8a04014dcfc892ff4"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=8cc3d23ddaa6339bf56608adaeefabff3ad329e7#8cc3d23ddaa6339bf56608adaeefabff3ad329e7"
 dependencies = [
 "num-bigint",
 "rustpython-compiler-core",
@@ -1671,7 +1796,7 @@ dependencies = [
 [[package]]
 name = "rustpython-compiler-core"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=97a9d9de687227595932d6c8a04014dcfc892ff4#97a9d9de687227595932d6c8a04014dcfc892ff4"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=8cc3d23ddaa6339bf56608adaeefabff3ad329e7#8cc3d23ddaa6339bf56608adaeefabff3ad329e7"
 dependencies = [
 "bincode",
 "bitflags",
@@ -1688,7 +1813,7 @@ dependencies = [
 [[package]]
 name = "rustpython-parser"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=97a9d9de687227595932d6c8a04014dcfc892ff4#97a9d9de687227595932d6c8a04014dcfc892ff4"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=8cc3d23ddaa6339bf56608adaeefabff3ad329e7#8cc3d23ddaa6339bf56608adaeefabff3ad329e7"
 dependencies = [
 "ahash",
 "anyhow",
@@ -1736,6 +1861,22 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"

+[[package]]
+name = "sct"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d53dcdb7c9f8158937a7981b48accfd39a43af418591a5d008c7b22b5e1b7ca4"
+dependencies = [
+ "ring",
+ "untrusted",
+]
+
+[[package]]
+name = "semver"
+version = "1.0.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93f6841e709003d68bb2deee8c343572bf446003ec20a583e76f7b15cebf3711"
+
 [[package]]
 name = "serde"
 version = "1.0.143"
@@ -1867,13 +2008,19 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "spin"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
+
 [[package]]
 name = "ssri"
 version = "7.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a9cec0d388f39fbe79d7aa600e8d38053bf97b1bc8d350da7c0ba800d0f423f2"
 dependencies = [
- "base64",
+ "base64 0.10.1",
 "digest 0.8.1",
 "hex 0.3.2",
 "serde",
@@ -2011,6 +2158,21 @@ dependencies = [
 "crunchy",
 ]

+[[package]]
+name = "tinyvec"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
+
 [[package]]
 name = "toml"
 version = "0.5.9"
@@ -2088,12 +2250,27 @@ dependencies = [
 "unic-common",
 ]

+[[package]]
+name = "unicode-bidi"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"

+[[package]]
+name = "unicode-normalization"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "854cbdc4f7bc6ae19c820d44abdc3277ac3e1b2b93db20a636825d9322fb60e6"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.3"
@@ -2106,6 +2283,56 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eec8e807a365e5c972debc47b8f06d361b37b94cfd18d48f7adc715fb86404dd"

+[[package]]
+name = "untrusted"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
+
+[[package]]
+name = "update-informer"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f154aee470c0882ea0f3b1cc2a46c5f4d24f282655f7b0cec065614fe24c447f"
+dependencies = [
+ "directories",
+ "semver",
+ "serde",
+ "serde_json",
+ "ureq",
+]
+
+[[package]]
+name = "ureq"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97acb4c28a254fd7a4aeec976c46a7fa404eac4d7c134b30c75144846d7cb8f"
+dependencies = [
+ "base64 0.13.0",
+ "chunked_transfer",
+ "flate2",
+ "log",
+ "once_cell",
+ "rustls",
+ "serde",
+ "serde_json",
+ "url",
+ "webpki",
+ "webpki-roots",
+]
+
+[[package]]
+name = "url"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a507c383b2d33b5fc35d1861e77e6b383d158b2da5e14fe51b83dfedf6fd578c"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
 [[package]]
 name = "value-bag"
 version = "1.0.0-alpha.9"
@@ -2233,6 +2460,25 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "webpki"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f095d78192e208183081cc07bc5515ef55216397af48b873e5edcd72637fa1bd"
+dependencies = [
+ "ring",
+ "untrusted",
+]
+
+[[package]]
+name = "webpki-roots"
+version = "0.22.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1c760f0d366a6c24a02ed7816e23e691f5d92291f94d15e836006fd11b04daf"
+dependencies = [
+ "webpki",
+]
+
 [[package]]
 name = "wepoll-ffi"
 version = "0.1.2"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruff"
-version = "0.0.20"
+version = "0.0.29"
 edition = "2021"

 [lib]
@@ -18,16 +18,24 @@ common-path = { version = "1.0.0" }
 dirs = { version = "4.0.0" }
 fern = { version = "0.6.1" }
 filetime = { version = "0.2.17" }
+glob = { version = "0.3.0" }
+itertools = "0.10.3"
 log = { version = "0.4.17" }
 notify = { version = "4.0.17" }
+once_cell = { version = "1.13.1" }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "97a9d9de687227595932d6c8a04014dcfc892ff4" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "8cc3d23ddaa6339bf56608adaeefabff3ad329e7" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 toml = { version = "0.5.9" }
+update-informer = { version = "0.5.0", default_features = false, features = ["pypi"], optional = true }
 walkdir = { version = "2.3.2" }

+[features]
+default = ["update-informer"]
+update-informer = ["dep:update-informer"]
+
 [profile.release]
 panic = "abort"
 lto = "thin"
--- a/README.md
+++ b/README.md
@@ -17,8 +17,9 @@ An extremely fast Python linter, written in Rust.
 - 🐍 Installable via `pip`
 - 🤝 Python 3.10 compatibility
 - 🛠️ `pyproject.toml` support
- 📦 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#caching)-inspired cache semantics
- 👀 [TypeScript](https://www.typescriptlang.org/docs/handbook/configuring-watch.html)-inspired `--watch` semantics
+- 📦 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#caching)-inspired cache support
+- 🔧 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#caching)-inspired `--fix` support
+- 👀 [TypeScript](https://www.typescriptlang.org/docs/handbook/configuring-watch.html)-inspired `--watch` support

 _ruff is a proof-of-concept and not yet intended for production use. It supports only a small subset
 of the Flake8 rules, and may crash on your codebase._
@@ -51,6 +52,16 @@ You can run ruff in `--watch` mode to automatically re-run on-change:
 ruff path/to/code/ --watch
 ```

+ruff also works with [Pre-Commit](https://pre-commit.com) (requires Cargo on system):
+
+```yaml
+repos:
+- repo: https://github.com/charliermarsh/ruff
+  rev: v0.0.29
+  hooks:
+    - id: lint
+```
+
 ## Configuration

 ruff is configurable both via `pyproject.toml` and the command line.
@@ -75,7 +86,7 @@ ruff path/to/code/ --select F401 F403
 See `ruff --help` for more:

 ```shell
-ruff
+ruff (v0.0.29)
 An extremely fast Python linter.

 USAGE:
@@ -86,6 +97,7 @@ ARGS:

 OPTIONS:
    -e, --exit-zero             Exit with status code "0", even upon detecting errors
+    -f, --fix                   Attempt to automatically fix lint errors
    -h, --help                  Print help information
        --ignore <IGNORE>...    Comma-separated list of error codes to ignore
    -n, --no-cache              Disable cache reads
@@ -96,6 +108,43 @@ OPTIONS:
    -w, --watch                 Run in watch mode by re-running whenever files change
 ```

+### Compatibility with Black
+
+ruff is intended to be compatible with [Black](https://github.com/psf/black), and should be
+compatible out-of-the-box as long as the `line-length` setting is consistent between the two.
+
+As a project, ruff is designed to be used alongside Black and, as such, will defer implementing
+lint rules that are obviated by Black (e.g., stylistic rules).
+
+## Rules
+
+| Code | Name | Message |
+| ---- | ----- | ------- |
+| E402 | ModuleImportNotAtTopOfFile | Module level import not at top of file |
+| E501 | LineTooLong | Line too long |
+| E711 | NoneComparison | Comparison to `None` should be `cond is None` |
+| E712 | TrueFalseComparison | Comparison to `True` should be `cond is True` |
+| E713 | NotInTest | Test for membership should be `not in` |
+| E714 | NotIsTest | Test for object identity should be `is not` |
+| E731 | DoNotAssignLambda | Do not assign a lambda expression, use a def |
+| E902 | IOError | No such file or directory: `...` |
+| F401 | UnusedImport | `...` imported but unused |
+| F403 | ImportStarUsage | Unable to detect undefined names |
+| F541 | FStringMissingPlaceholders | f-string without any placeholders |
+| F631 | AssertTuple | Assert test is a non-empty tuple, which is always `True` |
+| F634 | IfTuple | If test is a tuple, which is always `True` |
+| F704 | YieldOutsideFunction | a `yield` or `yield from` statement outside of a function/method |
+| F706 | ReturnOutsideFunction | a `return` statement outside of a function/method |
+| F707 | DefaultExceptNotLast | an `except:` block as not the last exception handler |
+| F821 | UndefinedName | Undefined name `...` |
+| F822 | UndefinedExport | Undefined name `...` in `__all__` |
+| 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` |
+| R001 | UselessObjectInheritance | Class `...` inherits from object |
+| R002 | NoAssertEquals | `assertEquals` is deprecated, use `assertEqual` instead |
+
 ## Development

 ruff is written in Rust (1.63.0). You'll need to install the [Rust toolchain](https://www.rust-lang.org/tools/install)
@@ -104,7 +153,7 @@ for development.
 Assuming you have `cargo` installed, you can run:

 ```shell
-cargo run resources/test/src
+cargo run resources/test/fixtures
 cargo fmt
 cargo clippy
 cargo test
@@ -131,46 +180,22 @@ Add this `pyproject.toml` to the CPython directory:
 [tool.linter]
 line-length = 88
 exclude = [
-    "Lib/ctypes/test/test_numbers.py",
-    "Lib/dataclasses.py",
    "Lib/lib2to3/tests/data/bom.py",
    "Lib/lib2to3/tests/data/crlf.py",
    "Lib/lib2to3/tests/data/different_encoding.py",
    "Lib/lib2to3/tests/data/false_encoding.py",
    "Lib/lib2to3/tests/data/py2_test_grammar.py",
-    "Lib/sqlite3/test/factory.py",
-    "Lib/sqlite3/test/hooks.py",
-    "Lib/sqlite3/test/regression.py",
-    "Lib/sqlite3/test/transactions.py",
-    "Lib/sqlite3/test/types.py",
    "Lib/test/bad_coding2.py",
    "Lib/test/badsyntax_3131.py",
    "Lib/test/badsyntax_pep3120.py",
    "Lib/test/encoded_modules/module_iso_8859_1.py",
    "Lib/test/encoded_modules/module_koi8_r.py",
-    "Lib/test/sortperf.py",
-    "Lib/test/test_email/torture_test.py",
    "Lib/test/test_fstring.py",
-    "Lib/test/test_genericpath.py",
-    "Lib/test/test_getopt.py",
    "Lib/test/test_grammar.py",
-    "Lib/test/test_htmlparser.py",
-    "Lib/test/test_importlib/stubs.py",
-    "Lib/test/test_importlib/test_files.py",
-    "Lib/test/test_importlib/test_metadata_api.py",
-    "Lib/test/test_importlib/test_open.py",
    "Lib/test/test_importlib/test_util.py",
    "Lib/test/test_named_expressions.py",
    "Lib/test/test_patma.py",
-    "Lib/test/test_peg_generator/__main__.py",
-    "Lib/test/test_pipes.py",
    "Lib/test/test_source_encoding.py",
-    "Lib/test/test_weakref.py",
-    "Lib/test/test_webbrowser.py",
-    "Lib/tkinter/__main__.py",
-    "Lib/tkinter/test/test_tkinter/test_variables.py",
-    "Modules/_decimal/libmpdec/literature/fnt.py",
-    "Modules/_decimal/tests/deccheck.py",
    "Tools/c-analyzer/c_parser/parser/_delim.py",
    "Tools/i18n/pygettext.py",
    "Tools/test2to3/maintest.py",
@@ -215,6 +240,7 @@ hyperfine --ignore-failure --warmup 5 \
 ```

 In order, these evaluate:
+
 - ruff
 - Pylint
 - PyFlakes
--- a/examples/generate_rules_table.rs
+++ b/examples/generate_rules_table.rs
@@ -0,0 +1,43 @@
+/// Generate a Markdown-compatible table of supported lint rules.
+use ruff::checks::{CheckKind, RejectedCmpop};
+
+fn main() {
+    let mut check_kinds: Vec<CheckKind> = vec![
+        CheckKind::AssertTuple,
+        CheckKind::DefaultExceptNotLast,
+        CheckKind::DoNotAssignLambda,
+        CheckKind::DuplicateArgumentName,
+        CheckKind::FStringMissingPlaceholders,
+        CheckKind::IOError("...".to_string()),
+        CheckKind::IfTuple,
+        CheckKind::ImportStarUsage,
+        CheckKind::LineTooLong,
+        CheckKind::ModuleImportNotAtTopOfFile,
+        CheckKind::NoAssertEquals,
+        CheckKind::NoneComparison(RejectedCmpop::Eq),
+        CheckKind::NotInTest,
+        CheckKind::NotIsTest,
+        CheckKind::RaiseNotImplemented,
+        CheckKind::ReturnOutsideFunction,
+        CheckKind::TrueFalseComparison(true, RejectedCmpop::Eq),
+        CheckKind::UndefinedExport("...".to_string()),
+        CheckKind::UndefinedLocal("...".to_string()),
+        CheckKind::UndefinedName("...".to_string()),
+        CheckKind::UnusedImport("...".to_string()),
+        CheckKind::UnusedVariable("...".to_string()),
+        CheckKind::UselessObjectInheritance("...".to_string()),
+        CheckKind::YieldOutsideFunction,
+    ];
+    check_kinds.sort_by_key(|check_kind| check_kind.code());
+
+    println!("| Code | Name | Message |");
+    println!("| ---- | ----- | ------- |");
+    for check_kind in check_kinds {
+        println!(
+            "| {} | {} | {} |",
+            check_kind.code().as_str(),
+            check_kind.name(),
+            check_kind.body()
+        );
+    }
+}
--- a/examples/print_ast.rs
+++ b/examples/print_ast.rs
@@ -0,0 +1,25 @@
+/// Print the AST for a given Python file.
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::{Parser, ValueHint};
+use rustpython_parser::parser;
+
+use ruff::fs;
+
+#[derive(Debug, Parser)]
+struct Cli {
+    #[clap(parse(from_os_str), value_hint = ValueHint::FilePath, required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let contents = fs::read_file(&cli.file)?;
+    let python_ast = parser::parse_program(&contents, &cli.file.to_string_lossy())?;
+
+    println!("{:#?}", python_ast);
+
+    Ok(())
+}
--- a/examples/print_tokens.rs
+++ b/examples/print_tokens.rs
@@ -0,0 +1,25 @@
+/// Print the token stream for a given Python file.
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::{Parser, ValueHint};
+use rustpython_parser::lexer;
+
+use ruff::fs;
+
+#[derive(Debug, Parser)]
+struct Cli {
+    #[clap(parse(from_os_str), value_hint = ValueHint::FilePath, required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let contents = fs::read_file(&cli.file)?;
+    for (_, tok, _) in lexer::make_tokenizer(&contents).flatten() {
+        println!("{:#?}", tok);
+    }
+
+    Ok(())
+}
--- a/resources/test/fixtures/E402.py
+++ b/resources/test/fixtures/E402.py
@@ -0,0 +1,28 @@
+"""Top-level docstring."""
+import a
+
+try:
+    import b
+except ImportError:
+    pass
+else:
+    pass
+
+import c
+
+if x > 0:
+    import d
+else:
+    import e
+
+y = x + 1
+
+import f
+
+
+def foo() -> None:
+    import e
+
+
+if __name__ == "__main__":
+    import g
--- a/resources/test/fixtures/E501.py
+++ b/resources/test/fixtures/E501.py
--- a/resources/test/fixtures/E711.py
+++ b/resources/test/fixtures/E711.py
@@ -0,0 +1,11 @@
+if var == None:
+    pass
+
+if None != var:
+    pass
+
+if var is None:
+    pass
+
+if None is not var:
+    pass
--- a/resources/test/fixtures/E712.py
+++ b/resources/test/fixtures/E712.py
@@ -0,0 +1,14 @@
+if var == True:
+    pass
+
+if False != var:
+    pass
+
+if var != False != True:
+    pass
+
+if var is True:
+    pass
+
+if False is not var:
+    pass
--- a/resources/test/fixtures/E713.py
+++ b/resources/test/fixtures/E713.py
@@ -0,0 +1,7 @@
+my_list = [1, 2, 3]
+if not num in my_list:
+    print(num)
+
+my_list = [1, 2, 3]
+if num not in my_list:
+    print(num)
--- a/resources/test/fixtures/E714.py
+++ b/resources/test/fixtures/E714.py
@@ -0,0 +1,5 @@
+if not user is None:
+    print(user.name)
+
+if user is not None:
+    print(user.name)
--- a/resources/test/fixtures/E731.py
+++ b/resources/test/fixtures/E731.py
@@ -0,0 +1,6 @@
+from typing import Callable, Iterable
+
+a = lambda x: x**2
+b = map(lambda x: 2 * x, range(3))
+c: Callable = lambda x: x**2
+d: Iterable = map(lambda x: 2 * x, range(3))
--- a/resources/test/fixtures/F401.py
+++ b/resources/test/fixtures/F401.py
@@ -0,0 +1,25 @@
+from __future__ import all_feature_names
+import os
+import functools
+from collections import (
+    Counter,
+    OrderedDict,
+    namedtuple,
+)
+import multiprocessing.pool
+import multiprocessing.process
+import logging.config
+import logging.handlers
+
+from blah import ClassA, ClassB, ClassC
+
+
+class X:
+    def a(self) -> "namedtuple":
+        x = os.environ["1"]
+        y = Counter()
+        z = multiprocessing.pool.ThreadPool()
+
+
+__all__ = ["ClassA"] + ["ClassB"]
+__all__ += ["ClassC"]
--- a/resources/test/fixtures/F403.py
+++ b/resources/test/fixtures/F403.py
--- a/resources/test/fixtures/F541.py
+++ b/resources/test/fixtures/F541.py
--- a/resources/test/fixtures/F631.py
+++ b/resources/test/fixtures/F631.py
@@ -0,0 +1,4 @@
+assert (False, "x")
+assert (False,)
+assert ()
+assert True
--- a/resources/test/fixtures/F634.py
+++ b/resources/test/fixtures/F634.py
@@ -6,3 +6,5 @@ for _ in range(5):
        pass
    elif (3, 4):
        pass
+    elif ():
+        pass
--- a/resources/test/fixtures/F704.py
+++ b/resources/test/fixtures/F704.py
@@ -0,0 +1,10 @@
+def f() -> int:
+    yield 1
+
+
+class Foo:
+    yield 2
+
+
+yield 3
+yield from 3
--- a/resources/test/fixtures/F706.py
+++ b/resources/test/fixtures/F706.py
--- a/resources/test/fixtures/F707.py
+++ b/resources/test/fixtures/F707.py
@@ -0,0 +1,46 @@
+try:
+    pass
+except:
+    pass
+except ValueError:
+    pass
+
+try:
+    pass
+except:
+    pass
+except ValueError:
+    pass
+finally:
+    pass
+
+try:
+    pass
+except:
+    pass
+except ValueError:
+    pass
+else:
+    pass
+
+try:
+    pass
+except:
+    pass
+
+try:
+    pass
+except ValueError:
+    pass
+except:
+    pass
+
+try:
+    pass
+except ValueError:
+    pass
+
+try:
+    pass
+finally:
+    pass
--- a/resources/test/fixtures/F821.py
+++ b/resources/test/fixtures/F821.py
@@ -0,0 +1,51 @@
+def get_name():
+    return self.name
+
+
+def get_name():
+    return (self.name,)
+
+
+def get_name():
+    del self.name
+
+
+def get_name(self):
+    return self.name
+
+
+x = list()
+
+
+def randdec(maxprec, maxexp):
+    return numeric_string(maxprec, maxexp)
+
+
+def ternary_optarg(prec, exp_range, itr):
+    for _ in range(100):
+        a = randdec(prec, 2 * exp_range)
+        b = randdec(prec, 2 * exp_range)
+        c = randdec(prec, 2 * exp_range)
+        yield a, b, c, None
+        yield a, b, c, None, None
+
+
+class Foo:
+    CLASS_VAR = 1
+    REFERENCES_CLASS_VAR = {"CLASS_VAR": CLASS_VAR}
+    ANNOTATED_CLASS_VAR: int = 2
+
+
+class Class:
+    def __init__(self):
+        # TODO(charlie): This should be recognized as a defined variable.
+        Class  # noqa: F821
+
+
+try:
+    x = 1 / 0
+except Exception as e:
+    print(e)
+
+
+y: int = 1
--- a/resources/test/fixtures/F822.py
+++ b/resources/test/fixtures/F822.py
@@ -0,0 +1,3 @@
+a = 1
+
+__all__ = ["a", "b"]
--- a/resources/test/fixtures/F823.py
+++ b/resources/test/fixtures/F823.py
@@ -15,3 +15,13 @@ def baz():
    global my_var
    global my_dict
    my_dict[my_var] += 1
+
+
+def dec(x):
+    return x
+
+
+@dec
+def f():
+    dec = 1
+    return dec
--- a/resources/test/fixtures/F831.py
+++ b/resources/test/fixtures/F831.py
--- a/resources/test/fixtures/F841.py
+++ b/resources/test/fixtures/F841.py
@@ -0,0 +1,16 @@
+try:
+    1 / 0
+except ValueError as e:
+    pass
+
+
+try:
+    1 / 0
+except ValueError as e:
+    print(e)
+
+
+def f():
+    x = 1
+    y = 2
+    z = x + y
--- a/resources/test/fixtures/F901.py
+++ b/resources/test/fixtures/F901.py
--- a/resources/test/fixtures/R001.py
+++ b/resources/test/fixtures/R001.py
@@ -0,0 +1,141 @@
+class A:
+    ...
+
+
+class A(object):
+    ...
+
+
+class A(
+    object,
+):
+    ...
+
+
+class A(
+    object,
+    #
+):
+    ...
+
+
+class A(
+    #
+    object,
+):
+    ...
+
+
+class A(
+    #
+    object
+):
+    ...
+
+
+class A(
+    object
+    #
+):
+    ...
+
+
+class A(
+    #
+    object,
+    #
+):
+    ...
+
+
+class A(
+    #
+    object,
+    #
+):
+    ...
+
+
+class A(
+    #
+    object
+    #
+):
+    ...
+
+
+class A(
+    #
+    object
+    #
+):
+    ...
+
+
+class B(A, object):
+    ...
+
+
+class B(object, A):
+    ...
+
+
+class B(
+    object,
+    A,
+):
+    ...
+
+
+class B(
+    A,
+    object,
+):
+    ...
+
+
+class B(
+    object,
+    # Comment on A.
+    A,
+):
+    ...
+
+
+class B(
+    # Comment on A.
+    A,
+    object,
+):
+    ...
+
+
+def f():
+    class A(object):
+        ...
+
+
+class A(
+    object,
+):
+    ...
+
+
+class A(
+    object,  # )
+):
+    ...
+
+
+class A(
+    object  # )
+    ,
+):
+    ...
+
+
+object = A
+
+
+class B(object):
+    ...
--- a/resources/test/fixtures/R002.py
+++ b/resources/test/fixtures/R002.py
@@ -0,0 +1,3 @@
+self.assertEquals (1, 2)
+self.assertEquals(1, 2)
+self.assertEqual(3, 4)
--- a/resources/test/fixtures/init.py
+++ b/resources/test/fixtures/init.py
--- a/resources/test/fixtures/bar/init.py
+++ b/resources/test/fixtures/bar/init.py
--- a/resources/test/fixtures/bar/migrations/init.py
+++ b/resources/test/fixtures/bar/migrations/init.py
--- a/resources/test/fixtures/bar/migrations/migration.py
+++ b/resources/test/fixtures/bar/migrations/migration.py
--- a/resources/test/fixtures/excluded.py
+++ b/resources/test/fixtures/excluded.py
@@ -0,0 +1,9 @@
+a = "abc"
+b = f"ghi{'jkl'}"
+
+c = f"def"
+d = f"def" + "ghi"
+e = (
+    f"def" +
+    "ghi"
+)
--- a/resources/test/fixtures/foo/init.py
+++ b/resources/test/fixtures/foo/init.py
--- a/resources/test/fixtures/foo/migrations/init.py
+++ b/resources/test/fixtures/foo/migrations/init.py
--- a/resources/test/fixtures/foo/migrations/migration.py
+++ b/resources/test/fixtures/foo/migrations/migration.py
@@ -0,0 +1,9 @@
+a = "abc"
+b = f"ghi{'jkl'}"
+
+c = f"def"
+d = f"def" + "ghi"
+e = (
+    f"def" +
+    "ghi"
+)
--- a/resources/test/fixtures/pyproject.toml
+++ b/resources/test/fixtures/pyproject.toml
@@ -0,0 +1,29 @@
+[tool.ruff]
+line-length = 88
+exclude = ["excluded.py", "**/migrations"]
+select = [
+    "E402",
+    "E501",
+    "E711",
+    "E712",
+    "E713",
+    "E714",
+    "E731",
+    "E902",
+    "F401",
+    "F403",
+    "F541",
+    "F631",
+    "F634",
+    "F704",
+    "F706",
+    "F707",
+    "F821",
+    "F822",
+    "F823",
+    "F831",
+    "F841",
+    "F901",
+    "R001",
+    "R002",
+]
--- a/resources/test/src/F401.py
+++ b/resources/test/src/F401.py
@@ -1,14 +0,0 @@
-import os
-import functools
-from collections import (
-    Counter,
-    OrderedDict,
-    namedtuple,
-)
-
-
-class X:
-    def a(self) -> "namedtuple":
-        x = os.environ["1"]
-        y = Counter()
-        return X
--- a/resources/test/src/F821.py
+++ b/resources/test/src/F821.py
@@ -1,16 +0,0 @@
-def get_name():
-    return self.name
-
-
-def get_name():
-    return (self.name,)
-
-
-def get_name():
-    del self.name
-
-
-def get_name(self):
-    return self.name
-
-x = list()
--- a/resources/test/src/pyproject.toml
+++ b/resources/test/src/pyproject.toml
@@ -1,15 +0,0 @@
-[tool.ruff]
-line-length = 88
-exclude = ["excluded.py"]
-select = [
-    "E501",
-    "F401",
-    "F403",
-    "F541",
-    "F634",
-    "F706",
-    "F821",
-    "F831",
-    "F832",
-    "F901",
-]
--- a/src/ast_ops.rs
+++ b/src/ast_ops.rs
@@ -0,0 +1,148 @@
+use std::collections::BTreeMap;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use rustpython_parser::ast::{Constant, Expr, ExprKind, Location, Stmt, StmtKind};
+
+fn id() -> usize {
+    static COUNTER: AtomicUsize = AtomicUsize::new(1);
+    COUNTER.fetch_add(1, Ordering::Relaxed)
+}
+
+pub enum ScopeKind {
+    Class,
+    Function,
+    Generator,
+    Module,
+}
+
+pub struct Scope {
+    pub id: usize,
+    pub kind: ScopeKind,
+    pub values: BTreeMap<String, Binding>,
+}
+
+impl Scope {
+    pub fn new(kind: ScopeKind) -> Self {
+        Scope {
+            id: id(),
+            kind,
+            values: BTreeMap::new(),
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub enum BindingKind {
+    Argument,
+    Assignment,
+    Builtin,
+    ClassDefinition,
+    Definition,
+    Export(Vec<String>),
+    FutureImportation,
+    Importation(String),
+    StarImportation,
+    SubmoduleImportation(String),
+}
+
+#[derive(Clone, Debug)]
+pub struct Binding {
+    pub kind: BindingKind,
+    pub location: Location,
+    pub used: Option<usize>,
+}
+
+/// Extract the names bound to a given __all__ assignment.
+pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<String> {
+    let mut names: Vec<String> = vec![];
+
+    fn add_to_names(names: &mut Vec<String>, elts: &[Expr]) {
+        for elt in elts {
+            if let ExprKind::Constant {
+                value: Constant::Str(value),
+                ..
+            } = &elt.node
+            {
+                names.push(value.to_string())
+            }
+        }
+    }
+
+    // Grab the existing bound __all__ values.
+    if let StmtKind::AugAssign { .. } = &stmt.node {
+        if let Some(binding) = scope.values.get("__all__") {
+            if let BindingKind::Export(existing) = &binding.kind {
+                names.extend(existing.clone());
+            }
+        }
+    }
+
+    if let Some(value) = match &stmt.node {
+        StmtKind::Assign { value, .. } => Some(value),
+        StmtKind::AnnAssign { value, .. } => value.as_ref(),
+        StmtKind::AugAssign { value, .. } => Some(value),
+        _ => None,
+    } {
+        match &value.node {
+            ExprKind::List { elts, .. } | ExprKind::Tuple { elts, .. } => {
+                add_to_names(&mut names, elts)
+            }
+            ExprKind::BinOp { left, right, .. } => {
+                let mut current_left = left;
+                let mut current_right = right;
+                while let Some(elts) = match &current_right.node {
+                    ExprKind::List { elts, .. } => Some(elts),
+                    ExprKind::Tuple { elts, .. } => Some(elts),
+                    _ => None,
+                } {
+                    add_to_names(&mut names, elts);
+                    match &current_left.node {
+                        ExprKind::BinOp { left, right, .. } => {
+                            current_left = left;
+                            current_right = right;
+                        }
+                        ExprKind::List { elts, .. } | ExprKind::Tuple { elts, .. } => {
+                            add_to_names(&mut names, elts);
+                            break;
+                        }
+                        _ => break,
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+
+    names
+}
+
+/// Struct used to efficiently slice source code at (row, column) Locations.
+pub struct SourceCodeLocator<'a> {
+    content: &'a str,
+    offsets: Vec<usize>,
+    initialized: bool,
+}
+
+impl<'a> SourceCodeLocator<'a> {
+    pub fn new(content: &'a str) -> Self {
+        SourceCodeLocator {
+            content,
+            offsets: vec![],
+            initialized: false,
+        }
+    }
+
+    pub fn slice_source_code(&mut self, location: &Location) -> &'a str {
+        if !self.initialized {
+            let mut offset = 0;
+            for i in self.content.lines() {
+                self.offsets.push(offset);
+                offset += i.len();
+                offset += 1;
+            }
+            self.initialized = true;
+        }
+        let offset = self.offsets[location.row() - 1] + location.column() - 1;
+        &self.content[offset..]
+    }
+}
--- a/src/autofix.rs
+++ b/src/autofix.rs
@@ -0,0 +1,216 @@
+use std::fs;
+use std::path::Path;
+
+use anyhow::Result;
+use rustpython_parser::ast::Location;
+
+use crate::checks::{Check, Fix};
+
+#[derive(Hash)]
+pub enum Mode {
+    Generate,
+    Apply,
+    None,
+}
+
+impl From<bool> for Mode {
+    fn from(value: bool) -> Self {
+        match value {
+            true => Mode::Apply,
+            false => Mode::None,
+        }
+    }
+}
+
+/// Auto-fix errors in a file, and write the fixed source code to disk.
+pub fn fix_file(checks: &mut [Check], contents: &str, path: &Path) -> Result<()> {
+    if checks.iter().all(|check| check.fix.is_none()) {
+        return Ok(());
+    }
+
+    let output = apply_fixes(
+        checks.iter_mut().filter_map(|check| check.fix.as_mut()),
+        contents,
+    );
+
+    fs::write(path, output).map_err(|e| e.into())
+}
+
+/// 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 = "".to_string();
+    let mut last_pos: Location = Location::new(0, 0);
+
+    for fix in fixes {
+        // Best-effort approach: if this fix overlaps with a fix we've already applied, skip it.
+        if last_pos > fix.start {
+            continue;
+        }
+
+        if fix.start.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.start.row() - 1] {
+                output.push_str(line);
+                output.push('\n');
+            }
+            output.push_str(&lines[fix.start.row() - 1][..fix.start.column() - 1]);
+            output.push_str(&fix.content);
+        } else {
+            output.push_str(
+                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.start.column() - 1],
+            );
+            output.push_str(&fix.content);
+        }
+
+        last_pos = fix.end;
+        fix.applied = true;
+    }
+
+    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()..] {
+        output.push_str(line);
+        output.push('\n');
+    }
+
+    output
+}
+
+#[cfg(test)]
+mod tests {
+    use anyhow::Result;
+    use rustpython_parser::ast::Location;
+
+    use crate::autofix::apply_fixes;
+    use crate::checks::Fix;
+
+    #[test]
+    fn empty_file() -> Result<()> {
+        let mut fixes = vec![];
+        let actual = apply_fixes(fixes.iter_mut(), "");
+        let expected = "";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn apply_single_replacement() -> Result<()> {
+        let mut fixes = vec![Fix {
+            content: "Bar".to_string(),
+            start: Location::new(1, 9),
+            end: Location::new(1, 15),
+            applied: false,
+        }];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object):
+        ...
+",
+        );
+
+        let expected = "class A(Bar):
+        ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn apply_single_removal() -> Result<()> {
+        let mut fixes = vec![Fix {
+            content: "".to_string(),
+            start: Location::new(1, 8),
+            end: Location::new(1, 16),
+            applied: false,
+        }];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object):
+        ...
+",
+        );
+
+        let expected = "class A:
+        ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn apply_double_removal() -> Result<()> {
+        let mut fixes = vec![
+            Fix {
+                content: "".to_string(),
+                start: Location::new(1, 8),
+                end: Location::new(1, 17),
+                applied: false,
+            },
+            Fix {
+                content: "".to_string(),
+                start: Location::new(1, 17),
+                end: Location::new(1, 24),
+                applied: false,
+            },
+        ];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object, object):
+        ...
+",
+        );
+
+        let expected = "class A:
+        ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn ignore_overlapping_fixes() -> Result<()> {
+        let mut fixes = vec![
+            Fix {
+                content: "".to_string(),
+                start: Location::new(1, 8),
+                end: Location::new(1, 16),
+                applied: false,
+            },
+            Fix {
+                content: "ignored".to_string(),
+                start: Location::new(1, 10),
+                end: Location::new(1, 12),
+                applied: false,
+            },
+        ];
+        let actual = apply_fixes(
+            fixes.iter_mut(),
+            "class A(object):
+    ...
+",
+        );
+
+        let expected = "class A:
+    ...
+";
+
+        assert_eq!(actual, expected);
+
+        Ok(())
+    }
+}
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,7 +1,9 @@
 use std::collections::hash_map::DefaultHasher;
+use std::fs::Metadata;
 use std::hash::{Hash, Hasher};
 use std::path::Path;

+use crate::autofix;
 use cacache::Error::EntryNotFound;
 use filetime::FileTime;
 use log::error;
@@ -66,12 +68,13 @@ impl From<bool> for Mode {
 }

 fn cache_dir() -> &'static str {
-    "./.cache"
+    "./.ruff_cache"
 }

-fn cache_key(path: &Path, settings: &Settings) -> String {
+fn cache_key(path: &Path, settings: &Settings, autofix: &autofix::Mode) -> String {
    let mut hasher = DefaultHasher::new();
    settings.hash(&mut hasher);
+    autofix.hash(&mut hasher);
    format!(
        "{}@{}@{}",
        path.canonicalize().unwrap().to_string_lossy(),
@@ -80,22 +83,28 @@ fn cache_key(path: &Path, settings: &Settings) -> String {
    )
 }

-pub fn get(path: &Path, settings: &Settings, mode: &Mode) -> Option<Vec<Message>> {
+pub fn get(
+    path: &Path,
+    metadata: &Metadata,
+    settings: &Settings,
+    autofix: &autofix::Mode,
+    mode: &Mode,
+) -> Option<Vec<Message>> {
    if !mode.allow_read() {
        return None;
    };

-    match cacache::read_sync(cache_dir(), cache_key(path, settings)) {
-        Ok(encoded) => match path.metadata() {
-            Ok(m) => match bincode::deserialize::<CheckResult>(&encoded[..]) {
-                Ok(CheckResult { metadata, messages }) => {
-                    if FileTime::from_last_modification_time(&m).unix_seconds() == metadata.mtime {
-                        return Some(messages);
-                    }
+    match cacache::read_sync(cache_dir(), cache_key(path, settings, autofix)) {
+        Ok(encoded) => match bincode::deserialize::<CheckResult>(&encoded[..]) {
+            Ok(CheckResult {
+                metadata: CacheMetadata { mtime },
+                messages,
+            }) => {
+                if FileTime::from_last_modification_time(metadata).unix_seconds() == mtime {
+                    return Some(messages);
                }
-                Err(e) => error!("Failed to deserialize encoded cache entry: {e:?}"),
-            },
-            Err(e) => error!("Failed to read metadata from path: {e:?}"),
+            }
+            Err(e) => error!("Failed to deserialize encoded cache entry: {e:?}"),
        },
        Err(EntryNotFound(_, _)) => {}
        Err(e) => error!("Failed to read from cache: {e:?}"),
@@ -103,24 +112,29 @@ pub fn get(path: &Path, settings: &Settings, mode: &Mode) -> Option<Vec<Message>
    None
 }

-pub fn set(path: &Path, settings: &Settings, messages: &[Message], mode: &Mode) {
+pub fn set(
+    path: &Path,
+    metadata: &Metadata,
+    settings: &Settings,
+    autofix: &autofix::Mode,
+    messages: &[Message],
+    mode: &Mode,
+) {
    if !mode.allow_write() {
        return;
    };

-    if let Ok(metadata) = path.metadata() {
-        let check_result = CheckResultRef {
-            metadata: &CacheMetadata {
-                mtime: FileTime::from_last_modification_time(&metadata).unix_seconds(),
-            },
-            messages,
-        };
-        if let Err(e) = cacache::write_sync(
-            cache_dir(),
-            cache_key(path, settings),
-            bincode::serialize(&check_result).unwrap(),
-        ) {
-            error!("Failed to write to cache: {e:?}")
-        }
+    let check_result = CheckResultRef {
+        metadata: &CacheMetadata {
+            mtime: FileTime::from_last_modification_time(metadata).unix_seconds(),
+        },
+        messages,
+    };
+    if let Err(e) = cacache::write_sync(
+        cache_dir(),
+        cache_key(path, settings, autofix),
+        bincode::serialize(&check_result).unwrap(),
+    ) {
+        error!("Failed to write to cache: {e:?}")
    }
 }
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
--- a/src/check_lines.rs
+++ b/src/check_lines.rs
@@ -3,8 +3,24 @@ use rustpython_parser::ast::Location;
 use crate::checks::{Check, CheckKind};
 use crate::settings::Settings;

+/// Whether the given line is too long and should be reported.
+fn should_enforce_line_length(line: &str, limit: usize) -> bool {
+    if line.len() > limit {
+        let mut chunks = line.split_whitespace();
+        if let (Some(first), Some(_)) = (chunks.next(), chunks.next()) {
+            // Do not enforce the line length for commented lines with a single word
+            !(first == "#" && chunks.next().is_none())
+        } else {
+            // Single word / no printable chars - no way to make the line shorter
+            false
+        }
+    } else {
+        false
+    }
+}
+
 pub fn check_lines(checks: &mut Vec<Check>, contents: &str, settings: &Settings) {
-    let enforce_line_too_ling = settings.select.contains(CheckKind::LineTooLong.code());
+    let enforce_line_too_long = settings.select.contains(CheckKind::LineTooLong.code());

    let mut line_checks = vec![];
    let mut ignored = vec![];
@@ -18,21 +34,19 @@ pub fn check_lines(checks: &mut Vec<Check>, contents: &str, settings: &Settings)
        }

        // Enforce line length.
-        if enforce_line_too_ling && line.len() > settings.line_length {
-            let chunks: Vec<&str> = line.split_whitespace().collect();
-            if !(chunks.len() == 1 || (chunks.len() == 2 && chunks[0] == "#")) {
-                let check = Check {
-                    kind: CheckKind::LineTooLong,
-                    location: Location::new(row + 1, settings.line_length + 1),
-                };
-                if !check.is_inline_ignored(line) {
-                    line_checks.push(check);
-                }
+        if enforce_line_too_long && should_enforce_line_length(line, settings.line_length) {
+            let check = Check::new(
+                CheckKind::LineTooLong,
+                Location::new(row + 1, settings.line_length + 1),
+            );
+            if !check.is_inline_ignored(line) {
+                line_checks.push(check);
            }
        }
    }
+    ignored.sort();
    for index in ignored.iter().rev() {
-        checks.remove(*index);
+        checks.swap_remove(*index);
    }
    checks.extend(line_checks);
 }
--- a/src/checks.rs
+++ b/src/checks.rs
@@ -1,22 +1,37 @@
 use std::str::FromStr;

 use anyhow::Result;
+use once_cell::sync::Lazy;
 use regex::Regex;
 use rustpython_parser::ast::Location;
 use serde::{Deserialize, Serialize};

 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Hash, PartialOrd, Ord)]
 pub enum CheckCode {
+    E402,
    E501,
+    E711,
+    E712,
+    E713,
+    E714,
+    E731,
+    E902,
    F401,
    F403,
    F541,
+    F631,
    F634,
+    F704,
    F706,
+    F707,
    F821,
+    F822,
+    F823,
    F831,
-    F832,
+    F841,
    F901,
+    R001,
+    R002,
 }

 impl FromStr for CheckCode {
@@ -24,16 +39,30 @@ impl FromStr for CheckCode {

    fn from_str(s: &str) -> Result<Self> {
        match s {
+            "E402" => Ok(CheckCode::E402),
            "E501" => Ok(CheckCode::E501),
+            "E711" => Ok(CheckCode::E711),
+            "E712" => Ok(CheckCode::E712),
+            "E713" => Ok(CheckCode::E713),
+            "E714" => Ok(CheckCode::E714),
+            "E731" => Ok(CheckCode::E731),
+            "E902" => Ok(CheckCode::E902),
            "F401" => Ok(CheckCode::F401),
            "F403" => Ok(CheckCode::F403),
            "F541" => Ok(CheckCode::F541),
+            "F631" => Ok(CheckCode::F631),
            "F634" => Ok(CheckCode::F634),
+            "F704" => Ok(CheckCode::F704),
            "F706" => Ok(CheckCode::F706),
+            "F707" => Ok(CheckCode::F707),
            "F821" => Ok(CheckCode::F821),
+            "F822" => Ok(CheckCode::F822),
+            "F823" => Ok(CheckCode::F823),
            "F831" => Ok(CheckCode::F831),
-            "F832" => Ok(CheckCode::F832),
+            "F841" => Ok(CheckCode::F841),
            "F901" => Ok(CheckCode::F901),
+            "R001" => Ok(CheckCode::R001),
+            "R002" => Ok(CheckCode::R002),
            _ => Err(anyhow::anyhow!("Unknown check code: {s}")),
        }
    }
@@ -42,32 +71,60 @@ impl FromStr for CheckCode {
 impl CheckCode {
    pub fn as_str(&self) -> &str {
        match self {
+            CheckCode::E402 => "E402",
            CheckCode::E501 => "E501",
+            CheckCode::E711 => "E711",
+            CheckCode::E712 => "E712",
+            CheckCode::E713 => "E713",
+            CheckCode::E714 => "E714",
+            CheckCode::E731 => "E731",
+            CheckCode::E902 => "E902",
            CheckCode::F401 => "F401",
            CheckCode::F403 => "F403",
            CheckCode::F541 => "F541",
+            CheckCode::F631 => "F631",
            CheckCode::F634 => "F634",
+            CheckCode::F704 => "F704",
            CheckCode::F706 => "F706",
+            CheckCode::F707 => "F707",
            CheckCode::F821 => "F821",
+            CheckCode::F822 => "F822",
+            CheckCode::F823 => "F823",
            CheckCode::F831 => "F831",
-            CheckCode::F832 => "F832",
+            CheckCode::F841 => "F841",
            CheckCode::F901 => "F901",
+            CheckCode::R001 => "R001",
+            CheckCode::R002 => "R002",
        }
    }

    /// The source for the check (either the AST, or the physical lines).
    pub fn lint_source(&self) -> &'static LintSource {
        match self {
+            CheckCode::E402 => &LintSource::AST,
            CheckCode::E501 => &LintSource::Lines,
+            CheckCode::E711 => &LintSource::AST,
+            CheckCode::E712 => &LintSource::AST,
+            CheckCode::E713 => &LintSource::AST,
+            CheckCode::E714 => &LintSource::AST,
+            CheckCode::E731 => &LintSource::AST,
+            CheckCode::E902 => &LintSource::FileSystem,
            CheckCode::F401 => &LintSource::AST,
            CheckCode::F403 => &LintSource::AST,
            CheckCode::F541 => &LintSource::AST,
+            CheckCode::F631 => &LintSource::AST,
            CheckCode::F634 => &LintSource::AST,
+            CheckCode::F704 => &LintSource::AST,
            CheckCode::F706 => &LintSource::AST,
+            CheckCode::F707 => &LintSource::AST,
            CheckCode::F821 => &LintSource::AST,
+            CheckCode::F822 => &LintSource::AST,
+            CheckCode::F823 => &LintSource::AST,
            CheckCode::F831 => &LintSource::AST,
-            CheckCode::F832 => &LintSource::AST,
+            CheckCode::F841 => &LintSource::AST,
            CheckCode::F901 => &LintSource::AST,
+            CheckCode::R001 => &LintSource::AST,
+            CheckCode::R002 => &LintSource::AST,
        }
    }
 }
@@ -76,59 +133,169 @@ impl CheckCode {
 pub enum LintSource {
    AST,
    Lines,
+    FileSystem,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum RejectedCmpop {
+    Eq,
+    NotEq,
 }

 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub enum CheckKind {
+    AssertTuple,
+    DefaultExceptNotLast,
+    DoNotAssignLambda,
    DuplicateArgumentName,
    FStringMissingPlaceholders,
+    IOError(String),
    IfTuple,
    ImportStarUsage,
    LineTooLong,
+    ModuleImportNotAtTopOfFile,
+    NoAssertEquals,
+    NoneComparison(RejectedCmpop),
+    NotInTest,
+    NotIsTest,
    RaiseNotImplemented,
    ReturnOutsideFunction,
-    UndefinedName(String),
+    TrueFalseComparison(bool, RejectedCmpop),
+    UndefinedExport(String),
    UndefinedLocal(String),
+    UndefinedName(String),
    UnusedImport(String),
+    UnusedVariable(String),
+    UselessObjectInheritance(String),
+    YieldOutsideFunction,
 }

 impl CheckKind {
+    /// The name of the check.
+    pub fn name(&self) -> &'static str {
+        match self {
+            CheckKind::AssertTuple => "AssertTuple",
+            CheckKind::DefaultExceptNotLast => "DefaultExceptNotLast",
+            CheckKind::DuplicateArgumentName => "DuplicateArgumentName",
+            CheckKind::FStringMissingPlaceholders => "FStringMissingPlaceholders",
+            CheckKind::IOError(_) => "IOError",
+            CheckKind::IfTuple => "IfTuple",
+            CheckKind::ImportStarUsage => "ImportStarUsage",
+            CheckKind::LineTooLong => "LineTooLong",
+            CheckKind::DoNotAssignLambda => "DoNotAssignLambda",
+            CheckKind::ModuleImportNotAtTopOfFile => "ModuleImportNotAtTopOfFile",
+            CheckKind::NoAssertEquals => "NoAssertEquals",
+            CheckKind::NoneComparison(_) => "NoneComparison",
+            CheckKind::NotInTest => "NotInTest",
+            CheckKind::NotIsTest => "NotIsTest",
+            CheckKind::RaiseNotImplemented => "RaiseNotImplemented",
+            CheckKind::ReturnOutsideFunction => "ReturnOutsideFunction",
+            CheckKind::TrueFalseComparison(_, _) => "TrueFalseComparison",
+            CheckKind::UndefinedExport(_) => "UndefinedExport",
+            CheckKind::UndefinedLocal(_) => "UndefinedLocal",
+            CheckKind::UndefinedName(_) => "UndefinedName",
+            CheckKind::UnusedImport(_) => "UnusedImport",
+            CheckKind::UnusedVariable(_) => "UnusedVariable",
+            CheckKind::UselessObjectInheritance(_) => "UselessObjectInheritance",
+            CheckKind::YieldOutsideFunction => "YieldOutsideFunction",
+        }
+    }
+
    /// A four-letter shorthand code for the check.
    pub fn code(&self) -> &'static CheckCode {
        match self {
+            CheckKind::AssertTuple => &CheckCode::F631,
+            CheckKind::DefaultExceptNotLast => &CheckCode::F707,
            CheckKind::DuplicateArgumentName => &CheckCode::F831,
            CheckKind::FStringMissingPlaceholders => &CheckCode::F541,
+            CheckKind::IOError(_) => &CheckCode::E902,
            CheckKind::IfTuple => &CheckCode::F634,
            CheckKind::ImportStarUsage => &CheckCode::F403,
            CheckKind::LineTooLong => &CheckCode::E501,
+            CheckKind::DoNotAssignLambda => &CheckCode::E731,
+            CheckKind::ModuleImportNotAtTopOfFile => &CheckCode::E402,
+            CheckKind::NoAssertEquals => &CheckCode::R002,
+            CheckKind::NoneComparison(_) => &CheckCode::E711,
+            CheckKind::NotInTest => &CheckCode::E713,
+            CheckKind::NotIsTest => &CheckCode::E714,
            CheckKind::RaiseNotImplemented => &CheckCode::F901,
            CheckKind::ReturnOutsideFunction => &CheckCode::F706,
+            CheckKind::TrueFalseComparison(_, _) => &CheckCode::E712,
+            CheckKind::UndefinedExport(_) => &CheckCode::F822,
+            CheckKind::UndefinedLocal(_) => &CheckCode::F823,
            CheckKind::UndefinedName(_) => &CheckCode::F821,
-            CheckKind::UndefinedLocal(_) => &CheckCode::F832,
            CheckKind::UnusedImport(_) => &CheckCode::F401,
+            CheckKind::UnusedVariable(_) => &CheckCode::F841,
+            CheckKind::UselessObjectInheritance(_) => &CheckCode::R001,
+            CheckKind::YieldOutsideFunction => &CheckCode::F704,
        }
    }

    /// The body text for the check.
    pub fn body(&self) -> String {
        match self {
+            CheckKind::AssertTuple => {
+                "Assert test is a non-empty tuple, which is always `True`".to_string()
+            }
+            CheckKind::DefaultExceptNotLast => {
+                "an `except:` block as not the last exception handler".to_string()
+            }
            CheckKind::DuplicateArgumentName => {
                "Duplicate argument name in function definition".to_string()
            }
            CheckKind::FStringMissingPlaceholders => {
                "f-string without any placeholders".to_string()
            }
-            CheckKind::IfTuple => {
-                "If test is a tuple.to_string(), which is always `True`".to_string()
+            CheckKind::IOError(name) => {
+                format!("No such file or directory: `{name}`")
            }
+            CheckKind::IfTuple => "If test is a tuple, which is always `True`".to_string(),
            CheckKind::ImportStarUsage => "Unable to detect undefined names".to_string(),
            CheckKind::LineTooLong => "Line too long".to_string(),
+            CheckKind::DoNotAssignLambda => {
+                "Do not assign a lambda expression, use a def".to_string()
+            }
+            CheckKind::ModuleImportNotAtTopOfFile => {
+                "Module level import not at top of file".to_string()
+            }
+            CheckKind::NoAssertEquals => {
+                "`assertEquals` is deprecated, use `assertEqual` instead".to_string()
+            }
+            CheckKind::NoneComparison(op) => match op {
+                RejectedCmpop::Eq => "Comparison to `None` should be `cond is None`".to_string(),
+                RejectedCmpop::NotEq => {
+                    "Comparison to `None` should be `cond is not None`".to_string()
+                }
+            },
+            CheckKind::NotInTest => "Test for membership should be `not in`".to_string(),
+            CheckKind::NotIsTest => "Test for object identity should be `is not`".to_string(),
            CheckKind::RaiseNotImplemented => {
-                "'raise NotImplemented' should be 'raise NotImplementedError".to_string()
+                "`raise NotImplemented` should be `raise NotImplementedError`".to_string()
            }
            CheckKind::ReturnOutsideFunction => {
                "a `return` statement outside of a function/method".to_string()
            }
+            CheckKind::TrueFalseComparison(value, op) => match *value {
+                true => match op {
+                    RejectedCmpop::Eq => {
+                        "Comparison to `True` should be `cond is True`".to_string()
+                    }
+                    RejectedCmpop::NotEq => {
+                        "Comparison to `True` should be `cond is not True`".to_string()
+                    }
+                },
+                false => match op {
+                    RejectedCmpop::Eq => {
+                        "Comparison to `False` should be `cond is False`".to_string()
+                    }
+                    RejectedCmpop::NotEq => {
+                        "Comparison to `False` should be `cond is not False`".to_string()
+                    }
+                },
+            },
+            CheckKind::UndefinedExport(name) => {
+                format!("Undefined name `{name}` in `__all__`")
+            }
            CheckKind::UndefinedName(name) => {
                format!("Undefined name `{name}`")
            }
@@ -136,24 +303,87 @@ impl CheckKind {
                format!("Local variable `{name}` referenced before assignment")
            }
            CheckKind::UnusedImport(name) => format!("`{name}` imported but unused"),
+            CheckKind::UnusedVariable(name) => {
+                format!("Local variable `{name}` is assigned to but never used")
+            }
+            CheckKind::UselessObjectInheritance(name) => {
+                format!("Class `{name}` inherits from object")
+            }
+            CheckKind::YieldOutsideFunction => {
+                "a `yield` or `yield from` statement outside of a function/method".to_string()
+            }
+        }
+    }
+
+    /// Whether the check kind is (potentially) fixable.
+    pub fn fixable(&self) -> bool {
+        match self {
+            CheckKind::AssertTuple => false,
+            CheckKind::DefaultExceptNotLast => false,
+            CheckKind::DuplicateArgumentName => false,
+            CheckKind::FStringMissingPlaceholders => false,
+            CheckKind::IOError(_) => false,
+            CheckKind::IfTuple => false,
+            CheckKind::ImportStarUsage => false,
+            CheckKind::DoNotAssignLambda => false,
+            CheckKind::LineTooLong => false,
+            CheckKind::ModuleImportNotAtTopOfFile => false,
+            CheckKind::NoAssertEquals => true,
+            CheckKind::NotInTest => false,
+            CheckKind::NotIsTest => false,
+            CheckKind::NoneComparison(_) => false,
+            CheckKind::RaiseNotImplemented => false,
+            CheckKind::ReturnOutsideFunction => false,
+            CheckKind::TrueFalseComparison(_, _) => false,
+            CheckKind::UndefinedExport(_) => false,
+            CheckKind::UndefinedLocal(_) => false,
+            CheckKind::UndefinedName(_) => false,
+            CheckKind::UnusedImport(_) => false,
+            CheckKind::UnusedVariable(_) => false,
+            CheckKind::UselessObjectInheritance(_) => true,
+            CheckKind::YieldOutsideFunction => false,
        }
    }
 }

-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Fix {
+    pub content: String,
+    pub start: Location,
+    pub end: Location,
+    pub applied: bool,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Check {
    pub kind: CheckKind,
    pub location: Location,
+    pub fix: Option<Fix>,
 }

+static NO_QA_REGEX: Lazy<Regex> = Lazy::new(|| {
+    Regex::new(r"(?i)# noqa(?::\s?(?P<codes>([A-Z]+[0-9]+(?:[,\s]+)?)+))?").expect("Invalid regex")
+});
+static SPLIT_COMMA_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").expect("Invalid regex"));
+
 impl Check {
+    pub fn new(kind: CheckKind, location: Location) -> Self {
+        Self {
+            kind,
+            location,
+            fix: None,
+        }
+    }
+
+    pub fn amend(&mut self, fix: Fix) {
+        self.fix = Some(fix);
+    }
+
    pub fn is_inline_ignored(&self, line: &str) -> bool {
-        let re = Regex::new(r"(?i)# noqa(?::\s?(?P<codes>([A-Z]+[0-9]+(?:[,\s]+)?)+))?").unwrap();
-        match re.captures(line) {
+        match NO_QA_REGEX.captures(line) {
            Some(caps) => match caps.name("codes") {
                Some(codes) => {
-                    let re = Regex::new(r"[,\s]").unwrap();
-                    for code in re
+                    for code in SPLIT_COMMA_REGEX
                        .split(codes.as_str())
                        .map(|code| code.trim())
                        .filter(|code| !code.is_empty())
--- a/src/fixer.rs
+++ b/src/fixer.rs
@@ -0,0 +1,126 @@
+use crate::ast_ops::SourceCodeLocator;
+use rustpython_parser::ast::{Expr, Keyword, Location};
+use rustpython_parser::lexer;
+use rustpython_parser::token::Tok;
+
+use crate::checks::Fix;
+
+/// Convert a location within a file (relative to `base`) to an absolute position.
+fn to_absolute(relative: &Location, base: &Location) -> Location {
+    if relative.row() == 1 {
+        Location::new(
+            relative.row() + base.row() - 1,
+            relative.column() + base.column() - 1,
+        )
+    } else {
+        Location::new(relative.row() + base.row() - 1, relative.column())
+    }
+}
+
+/// Generate a fix to remove a base from a ClassDef statement.
+pub fn remove_class_def_base(
+    locator: &mut SourceCodeLocator,
+    stmt_at: &Location,
+    expr_at: Location,
+    bases: &[Expr],
+    keywords: &[Keyword],
+) -> Option<Fix> {
+    let content = locator.slice_source_code(stmt_at);
+
+    // Case 1: `object` is the only base.
+    if bases.len() == 1 && keywords.is_empty() {
+        let mut fix_start = None;
+        let mut fix_end = None;
+        let mut count: usize = 0;
+        for (start, tok, end) in lexer::make_tokenizer(content).flatten() {
+            if matches!(tok, Tok::Lpar) {
+                if count == 0 {
+                    fix_start = Some(to_absolute(&start, stmt_at));
+                }
+                count += 1;
+            }
+
+            if matches!(tok, Tok::Rpar) {
+                count -= 1;
+                if count == 0 {
+                    fix_end = Some(to_absolute(&end, stmt_at));
+                    break;
+                }
+            }
+        }
+
+        return match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix {
+                content: "".to_string(),
+                start,
+                end,
+                applied: false,
+            }),
+            _ => None,
+        };
+    }
+
+    if bases
+        .iter()
+        .map(|node| node.location)
+        .chain(keywords.iter().map(|node| node.location))
+        .any(|location| location > expr_at)
+    {
+        // Case 2: `object` is _not_ the last node.
+        let mut fix_start: Option<Location> = None;
+        let mut fix_end: Option<Location> = None;
+        let mut seen_comma = false;
+        for (start, tok, end) in lexer::make_tokenizer(content).flatten() {
+            let start = to_absolute(&start, stmt_at);
+            if seen_comma {
+                if matches!(tok, Tok::Newline) {
+                    fix_end = Some(end);
+                } else {
+                    fix_end = Some(start);
+                }
+                break;
+            }
+            if start == expr_at {
+                fix_start = Some(start);
+            }
+            if fix_start.is_some() && matches!(tok, Tok::Comma) {
+                seen_comma = true;
+            }
+        }
+
+        match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix {
+                content: "".to_string(),
+                start,
+                end,
+                applied: false,
+            }),
+            _ => None,
+        }
+    } else {
+        // Case 3: `object` is the last node, so we have to find the last token that isn't a comma.
+        let mut fix_start: Option<Location> = None;
+        let mut fix_end: Option<Location> = None;
+        for (start, tok, end) in lexer::make_tokenizer(content).flatten() {
+            let start = to_absolute(&start, stmt_at);
+            let end = to_absolute(&end, stmt_at);
+            if start == expr_at {
+                fix_end = Some(end);
+                break;
+            }
+            if matches!(tok, Tok::Comma) {
+                fix_start = Some(start);
+            }
+        }
+
+        match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix {
+                content: "".to_string(),
+                start,
+                end,
+                applied: false,
+            }),
+            _ => None,
+        }
+    }
+}
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -3,21 +3,33 @@ use std::io::{BufReader, Read};
 use std::path::{Path, PathBuf};

 use anyhow::Result;
+use glob::Pattern;
 use walkdir::{DirEntry, WalkDir};

 fn is_not_hidden(entry: &DirEntry) -> bool {
    entry
        .file_name()
        .to_str()
-        .map(|s| entry.depth() == 0 || !s.starts_with('.'))
+        .map(|s| (entry.depth() == 0 || !s.starts_with('.')))
        .unwrap_or(false)
 }

-pub fn iter_python_files(path: &PathBuf) -> impl Iterator<Item = DirEntry> {
+fn is_not_excluded(entry: &DirEntry, exclude: &[Pattern]) -> bool {
+    entry
+        .path()
+        .to_str()
+        .map(|s| !exclude.iter().any(|pattern| pattern.matches(s)))
+        .unwrap_or(false)
+}
+
+pub fn iter_python_files<'a>(
+    path: &'a PathBuf,
+    exclude: &'a [Pattern],
+) -> impl Iterator<Item = DirEntry> + 'a {
    WalkDir::new(path)
        .follow_links(true)
        .into_iter()
-        .filter_entry(is_not_hidden)
+        .filter_entry(|entry| is_not_hidden(entry) && is_not_excluded(entry, exclude))
        .filter_map(|entry| entry.ok())
        .filter(|entry| entry.path().to_string_lossy().ends_with(".py"))
 }
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,13 @@
+extern crate core;
+
+mod ast_ops;
+mod autofix;
 mod builtins;
 mod cache;
 pub mod check_ast;
 mod check_lines;
 pub mod checks;
+mod fixer;
 pub mod fs;
 pub mod linter;
 pub mod logging;
--- a/src/linter.rs
+++ b/src/linter.rs
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,15 +12,19 @@ use rayon::prelude::*;
 use walkdir::DirEntry;

 use ::ruff::checks::CheckCode;
+use ::ruff::checks::CheckKind;
 use ::ruff::fs::iter_python_files;
-use ::ruff::linter::check_path;
+use ::ruff::linter::lint_path;
 use ::ruff::logging::set_up_logging;
 use ::ruff::message::Message;
 use ::ruff::settings::Settings;
 use ::ruff::tell_user;

+const CARGO_PKG_NAME: &str = env!("CARGO_PKG_NAME");
+const CARGO_PKG_VERSION: &str = env!("CARGO_PKG_VERSION");
+
 #[derive(Debug, Parser)]
-#[clap(name = "ruff")]
+#[clap(name = format!("{CARGO_PKG_NAME} (v{CARGO_PKG_VERSION})"))]
 #[clap(about = "An extremely fast Python linter.", long_about = None)]
 struct Cli {
    #[clap(parse(from_os_str), value_hint = ValueHint::AnyPath, required = true)]
@@ -37,6 +41,9 @@ struct Cli {
    /// Run in watch mode by re-running whenever files change.
    #[clap(short, long, action)]
    watch: bool,
+    /// Attempt to automatically fix lint errors.
+    #[clap(short, long, action)]
+    fix: bool,
    /// Disable cache reads.
    #[clap(short, long, action)]
    no_cache: bool,
@@ -48,30 +55,71 @@ struct Cli {
    ignore: Vec<CheckCode>,
 }

-fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<Message>> {
+#[cfg(feature = "update-informer")]
+fn check_for_updates() {
+    use update_informer::{registry, Check};
+
+    let informer = update_informer::new(registry::PyPI, CARGO_PKG_NAME, CARGO_PKG_VERSION);
+
+    if let Some(new_version) = informer.check_version().ok().flatten() {
+        let msg = format!(
+            "A new version of {pkg_name} is available: v{pkg_version} -> {new_version}",
+            pkg_name = CARGO_PKG_NAME.italic().cyan(),
+            pkg_version = CARGO_PKG_VERSION,
+            new_version = new_version.to_string().green()
+        );
+
+        let cmd = format!(
+            "Run to update: {cmd} {pkg_name}",
+            cmd = "pip3 install --upgrade".green(),
+            pkg_name = CARGO_PKG_NAME.green()
+        );
+
+        println!("\n{msg}\n{cmd}");
+    }
+}
+
+fn run_once(
+    files: &[PathBuf],
+    settings: &Settings,
+    cache: bool,
+    autofix: bool,
+) -> Result<Vec<Message>> {
    // Collect all the files to check.
    let start = Instant::now();
-    let files: Vec<DirEntry> = files.iter().flat_map(iter_python_files).collect();
+    let paths: Vec<DirEntry> = files
+        .iter()
+        .flat_map(|path| iter_python_files(path, &settings.exclude))
+        .collect();
    let duration = start.elapsed();
    debug!("Identified files to lint in: {:?}", duration);

    let start = Instant::now();
-    let messages: Vec<Message> = files
+    let mut messages: Vec<Message> = paths
        .par_iter()
-        .filter(|entry| {
-            !settings
-                .exclude
-                .iter()
-                .any(|exclusion| entry.path().starts_with(exclusion))
-        })
        .map(|entry| {
-            check_path(entry.path(), settings, &cache.into()).unwrap_or_else(|e| {
+            lint_path(entry.path(), settings, &cache.into(), &autofix.into()).unwrap_or_else(|e| {
                error!("Failed to check {}: {e:?}", entry.path().to_string_lossy());
                vec![]
            })
        })
        .flatten()
        .collect();
+
+    if settings.select.contains(&CheckCode::E902) {
+        for file in files {
+            if !file.exists() {
+                messages.push(Message {
+                    kind: CheckKind::IOError(file.to_string_lossy().to_string()),
+                    fixed: false,
+                    location: Default::default(),
+                    filename: file.to_string_lossy().to_string(),
+                })
+            }
+        }
+    }
+
+    messages.sort_unstable();
    let duration = start.elapsed();
    debug!("Checked files in: {:?}", duration);

@@ -79,13 +127,32 @@ fn run_once(files: &[PathBuf], settings: &Settings, cache: bool) -> Result<Vec<M
 }

 fn report_once(messages: &[Message]) -> Result<()> {
-    println!("Found {} error(s).", messages.len());
+    let (fixed, outstanding): (Vec<&Message>, Vec<&Message>) =
+        messages.iter().partition(|message| message.fixed);
+    let num_fixable = outstanding
+        .iter()
+        .filter(|message| message.kind.fixable())
+        .count();

-    if !messages.is_empty() {
-        println!();
-        for message in messages {
+    if !outstanding.is_empty() {
+        for message in &outstanding {
            println!("{}", message);
        }
+        println!();
+    }
+
+    if !fixed.is_empty() {
+        println!(
+            "Found {} error(s) ({} fixed).",
+            outstanding.len(),
+            fixed.len()
+        );
+    } else {
+        println!("Found {} error(s).", outstanding.len());
+    }
+
+    if num_fixable > 0 {
+        println!("{num_fixable} potentially fixable with the --fix option.");
    }

    Ok(())
@@ -123,11 +190,15 @@ fn inner_main() -> Result<ExitCode> {
    }

    if cli.watch {
+        if cli.fix {
+            println!("Warning: --fix is not enabled in watch mode.")
+        }
+
        // Perform an initial run instantly.
        clearscreen::clear()?;
        tell_user!("Starting linter in watch mode...\n");

-        let messages = run_once(&cli.files, &settings, !cli.no_cache)?;
+        let messages = run_once(&cli.files, &settings, !cli.no_cache, false)?;
        if !cli.quiet {
            report_continuously(&messages)?;
        }
@@ -147,7 +218,7 @@ fn inner_main() -> Result<ExitCode> {
                            clearscreen::clear()?;
                            tell_user!("File change detected...\n");

-                            let messages = run_once(&cli.files, &settings, !cli.no_cache)?;
+                            let messages = run_once(&cli.files, &settings, !cli.no_cache, false)?;
                            if !cli.quiet {
                                report_continuously(&messages)?;
                            }
@@ -158,11 +229,14 @@ fn inner_main() -> Result<ExitCode> {
            }
        }
    } else {
-        let messages = run_once(&cli.files, &settings, !cli.no_cache)?;
+        let messages = run_once(&cli.files, &settings, !cli.no_cache, cli.fix)?;
        if !cli.quiet {
            report_once(&messages)?;
        }

+        #[cfg(feature = "update-informer")]
+        check_for_updates();
+
        if !messages.is_empty() && !cli.exit_zero {
            return Ok(ExitCode::FAILURE);
        }
--- a/src/message.rs
+++ b/src/message.rs
@@ -1,3 +1,4 @@
+use std::cmp::Ordering;
 use std::fmt;

 use colored::Colorize;
@@ -6,29 +7,30 @@ use serde::{Deserialize, Serialize};

 use crate::checks::CheckKind;

-#[derive(Serialize, Deserialize)]
-#[serde(remote = "Location")]
-struct LocationDef {
-    #[serde(getter = "Location::row")]
-    row: usize,
-    #[serde(getter = "Location::column")]
-    column: usize,
-}
-
-impl From<LocationDef> for Location {
-    fn from(def: LocationDef) -> Location {
-        Location::new(def.row, def.column)
-    }
-}
-
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Message {
    pub kind: CheckKind,
-    #[serde(with = "LocationDef")]
+    pub fixed: bool,
    pub location: Location,
    pub filename: String,
 }

+impl Ord for Message {
+    fn cmp(&self, other: &Self) -> Ordering {
+        (&self.filename, self.location.row(), self.location.column()).cmp(&(
+            &other.filename,
+            other.location.row(),
+            self.location.column(),
+        ))
+    }
+}
+
+impl PartialOrd for Message {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
 impl fmt::Display for Message {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(
--- a/src/pyproject.rs
+++ b/src/pyproject.rs
@@ -14,12 +14,20 @@ pub fn load_config<'a>(paths: impl IntoIterator<Item = &'a Path>) -> Result<(Pat
        Some(project_root) => match find_pyproject_toml(&project_root) {
            Some(path) => {
                debug!("Found pyproject.toml at: {}", path.to_string_lossy());
-                let pyproject = parse_pyproject_toml(&path)?;
-                let config = pyproject
-                    .tool
-                    .and_then(|tool| tool.ruff)
-                    .unwrap_or_default();
-                Ok((project_root, config))
+                match parse_pyproject_toml(&path) {
+                    Ok(pyproject) => {
+                        let config = pyproject
+                            .tool
+                            .and_then(|tool| tool.ruff)
+                            .unwrap_or_default();
+                        Ok((project_root, config))
+                    }
+                    Err(e) => {
+                        println!("Failed to load pyproject.toml: {:?}", e);
+                        println!("Falling back to default configuration...");
+                        Ok(Default::default())
+                    }
+                }
            }
            None => Ok(Default::default()),
        },
@@ -208,35 +216,51 @@ other-attribute = 1

    #[test]
    fn find_and_parse_pyproject_toml() -> Result<()> {
-        let project_root = find_project_root([Path::new("resources/test/src/__init__.py")])
+        let project_root = find_project_root([Path::new("resources/test/fixtures/__init__.py")])
            .expect("Unable to find project root.");
-        assert_eq!(project_root, Path::new("resources/test/src"));
+        assert_eq!(project_root, Path::new("resources/test/fixtures"));

        let path = find_pyproject_toml(&project_root).expect("Unable to find pyproject.toml.");
-        assert_eq!(path, Path::new("resources/test/src/pyproject.toml"));
+        assert_eq!(path, Path::new("resources/test/fixtures/pyproject.toml"));

        let pyproject = parse_pyproject_toml(&path)?;
        let config = pyproject
            .tool
-            .map(|tool| tool.ruff)
-            .flatten()
+            .and_then(|tool| tool.ruff)
            .expect("Unable to find tool.ruff.");
        assert_eq!(
            config,
            Config {
                line_length: Some(88),
-                exclude: Some(vec![Path::new("excluded.py").to_path_buf()]),
+                exclude: Some(vec![
+                    Path::new("excluded.py").to_path_buf(),
+                    Path::new("**/migrations").to_path_buf()
+                ]),
                select: Some(BTreeSet::from([
+                    CheckCode::E402,
                    CheckCode::E501,
+                    CheckCode::E711,
+                    CheckCode::E712,
+                    CheckCode::E713,
+                    CheckCode::E714,
+                    CheckCode::E731,
+                    CheckCode::E902,
                    CheckCode::F401,
                    CheckCode::F403,
                    CheckCode::F541,
+                    CheckCode::F631,
                    CheckCode::F634,
+                    CheckCode::F704,
                    CheckCode::F706,
+                    CheckCode::F707,
                    CheckCode::F821,
+                    CheckCode::F822,
+                    CheckCode::F823,
                    CheckCode::F831,
-                    CheckCode::F832,
+                    CheckCode::F841,
                    CheckCode::F901,
+                    CheckCode::R001,
+                    CheckCode::R002,
                ])),
            }
        );
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -1,8 +1,9 @@
 use std::collections::BTreeSet;
 use std::hash::{Hash, Hasher};
-use std::path::{Path, PathBuf};
+use std::path::Path;

 use anyhow::Result;
+use glob::Pattern;

 use crate::checks::CheckCode;
 use crate::pyproject::load_config;
@@ -10,7 +11,7 @@ use crate::pyproject::load_config;
 #[derive(Debug)]
 pub struct Settings {
    pub line_length: usize,
-    pub exclude: Vec<PathBuf>,
+    pub exclude: Vec<Pattern>,
    pub select: BTreeSet<CheckCode>,
 }

@@ -39,19 +40,35 @@ impl Settings {
                        path
                    }
                })
+                .map(|path| Pattern::new(&path.to_string_lossy()).expect("Invalid pattern."))
                .collect(),
            select: config.select.unwrap_or_else(|| {
                BTreeSet::from([
+                    CheckCode::E402,
                    CheckCode::E501,
+                    CheckCode::E711,
+                    CheckCode::E712,
+                    CheckCode::E713,
+                    CheckCode::E714,
+                    CheckCode::E731,
+                    CheckCode::E902,
                    CheckCode::F401,
                    CheckCode::F403,
                    CheckCode::F541,
+                    CheckCode::F631,
                    CheckCode::F634,
+                    CheckCode::F704,
                    CheckCode::F706,
+                    CheckCode::F707,
                    CheckCode::F821,
+                    CheckCode::F822,
+                    CheckCode::F823,
                    CheckCode::F831,
-                    CheckCode::F832,
+                    CheckCode::F841,
                    CheckCode::F901,
+                    // Disable refactoring codes by default.
+                    // CheckCode::R001,
+                    // CheckCode::R002,
                ])
            }),
        })
--- a/src/visitor.rs
+++ b/src/visitor.rs
@@ -11,12 +11,9 @@ pub trait Visitor {
    fn visit_annotation(&mut self, expr: &Expr) {
        walk_expr(self, expr);
    }
-    fn visit_expr(&mut self, expr: &Expr) {
+    fn visit_expr(&mut self, expr: &Expr, _parent: Option<&Stmt>) {
        walk_expr(self, expr);
    }
-    fn visit_ident(&mut self, ident: &str) {
-        walk_ident(self, ident);
-    }
    fn visit_constant(&mut self, constant: &Constant) {
        walk_constant(self, constant);
    }
@@ -66,87 +63,43 @@ pub trait Visitor {

 pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
    match &stmt.node {
-        StmtKind::FunctionDef {
-            name,
-            args,
-            body,
-            decorator_list,
-            returns,
-            ..
-        } => {
-            visitor.visit_ident(name);
+        StmtKind::FunctionDef { args, body, .. } => {
            visitor.visit_arguments(args);
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
-            for expr in decorator_list {
-                visitor.visit_expr(expr)
-            }
-            for expr in returns {
-                visitor.visit_annotation(expr);
-            }
        }
-        StmtKind::AsyncFunctionDef {
-            name,
-            args,
-            body,
-            decorator_list,
-            returns,
-            ..
-        } => {
-            visitor.visit_ident(name);
+        StmtKind::AsyncFunctionDef { args, body, .. } => {
            visitor.visit_arguments(args);
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
-            for expr in decorator_list {
-                visitor.visit_expr(expr)
-            }
-            for expr in returns {
-                visitor.visit_annotation(expr);
-            }
        }
-        StmtKind::ClassDef {
-            name,
-            bases,
-            keywords,
-            body,
-            decorator_list,
-        } => {
-            visitor.visit_ident(name);
-            for expr in bases {
-                visitor.visit_expr(expr)
-            }
-            for keyword in keywords {
-                visitor.visit_keyword(keyword)
-            }
+        StmtKind::ClassDef { body, .. } => {
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
-            for expr in decorator_list {
-                visitor.visit_expr(expr)
-            }
        }
        StmtKind::Return { value } => {
            if let Some(expr) = value {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::Delete { targets } => {
            for expr in targets {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::Assign { targets, value, .. } => {
            for expr in targets {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
-            visitor.visit_expr(value)
+            visitor.visit_expr(value, Some(stmt))
        }
        StmtKind::AugAssign { target, op, value } => {
-            visitor.visit_expr(target);
+            visitor.visit_expr(target, Some(stmt));
            visitor.visit_operator(op);
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, Some(stmt));
        }
        StmtKind::AnnAssign {
            target,
@@ -154,10 +107,10 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            value,
            ..
        } => {
-            visitor.visit_expr(target);
+            visitor.visit_expr(target, Some(stmt));
            visitor.visit_annotation(annotation);
            if let Some(expr) = value {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::For {
@@ -167,8 +120,8 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            orelse,
            ..
        } => {
-            visitor.visit_expr(target);
-            visitor.visit_expr(iter);
+            visitor.visit_expr(target, Some(stmt));
+            visitor.visit_expr(iter, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -183,8 +136,8 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            orelse,
            ..
        } => {
-            visitor.visit_expr(target);
-            visitor.visit_expr(iter);
+            visitor.visit_expr(target, Some(stmt));
+            visitor.visit_expr(iter, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -193,7 +146,7 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            }
        }
        StmtKind::While { test, body, orelse } => {
-            visitor.visit_expr(test);
+            visitor.visit_expr(test, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -202,7 +155,7 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            }
        }
        StmtKind::If { test, body, orelse } => {
-            visitor.visit_expr(test);
+            visitor.visit_expr(test, Some(stmt));
            for stmt in body {
                visitor.visit_stmt(stmt)
            }
@@ -228,17 +181,17 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
        }
        StmtKind::Match { subject, cases } => {
            // TODO(charlie): Handle `cases`.
-            visitor.visit_expr(subject);
+            visitor.visit_expr(subject, Some(stmt));
            for match_case in cases {
                visitor.visit_match_case(match_case);
            }
        }
        StmtKind::Raise { exc, cause } => {
            if let Some(expr) = exc {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            };
            if let Some(expr) = cause {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            };
        }
        StmtKind::Try {
@@ -261,9 +214,9 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
            }
        }
        StmtKind::Assert { test, msg } => {
-            visitor.visit_expr(test);
+            visitor.visit_expr(test, None);
            if let Some(expr) = msg {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, Some(stmt))
            }
        }
        StmtKind::Import { names } => {
@@ -271,25 +224,14 @@ pub fn walk_stmt<V: Visitor + ?Sized>(visitor: &mut V, stmt: &Stmt) {
                visitor.visit_alias(alias);
            }
        }
-        StmtKind::ImportFrom { module, names, .. } => {
-            if let Some(ident) = module {
-                visitor.visit_ident(ident);
-            }
+        StmtKind::ImportFrom { names, .. } => {
            for alias in names {
                visitor.visit_alias(alias);
            }
        }
-        StmtKind::Global { names } => {
-            for ident in names {
-                visitor.visit_ident(ident)
-            }
-        }
-        StmtKind::Nonlocal { names } => {
-            for ident in names {
-                visitor.visit_ident(ident)
-            }
-        }
-        StmtKind::Expr { value } => visitor.visit_expr(value),
+        StmtKind::Global { .. } => {}
+        StmtKind::Nonlocal { .. } => {}
+        StmtKind::Expr { value } => visitor.visit_expr(value, Some(stmt)),
        StmtKind::Pass => {}
        StmtKind::Break => {}
        StmtKind::Continue => {}
@@ -301,91 +243,91 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
        ExprKind::BoolOp { op, values } => {
            visitor.visit_boolop(op);
            for expr in values {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::NamedExpr { target, value } => {
-            visitor.visit_expr(target);
-            visitor.visit_expr(value);
+            visitor.visit_expr(target, None);
+            visitor.visit_expr(value, None);
        }
        ExprKind::BinOp { left, op, right } => {
-            visitor.visit_expr(left);
+            visitor.visit_expr(left, None);
            visitor.visit_operator(op);
-            visitor.visit_expr(right);
+            visitor.visit_expr(right, None);
        }
        ExprKind::UnaryOp { op, operand } => {
            visitor.visit_unaryop(op);
-            visitor.visit_expr(operand);
+            visitor.visit_expr(operand, None);
        }
        ExprKind::Lambda { args, body } => {
            visitor.visit_arguments(args);
-            visitor.visit_expr(body);
+            visitor.visit_expr(body, None);
        }
        ExprKind::IfExp { test, body, orelse } => {
-            visitor.visit_expr(test);
-            visitor.visit_expr(body);
-            visitor.visit_expr(orelse);
+            visitor.visit_expr(test, None);
+            visitor.visit_expr(body, None);
+            visitor.visit_expr(orelse, None);
        }
        ExprKind::Dict { keys, values } => {
            for expr in keys {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
            for expr in values {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::Set { elts } => {
            for expr in elts {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::ListComp { elt, generators } => {
-            visitor.visit_expr(elt);
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
+            visitor.visit_expr(elt, None);
        }
        ExprKind::SetComp { elt, generators } => {
-            visitor.visit_expr(elt);
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
+            visitor.visit_expr(elt, None);
        }
        ExprKind::DictComp {
            key,
            value,
            generators,
        } => {
-            visitor.visit_expr(key);
-            visitor.visit_expr(value);
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
+            visitor.visit_expr(key, None);
+            visitor.visit_expr(value, None);
        }
        ExprKind::GeneratorExp { elt, generators } => {
-            visitor.visit_expr(elt);
            for comprehension in generators {
                visitor.visit_comprehension(comprehension)
            }
+            visitor.visit_expr(elt, None);
        }
-        ExprKind::Await { value } => visitor.visit_expr(value),
+        ExprKind::Await { value } => visitor.visit_expr(value, None),
        ExprKind::Yield { value } => {
            if let Some(expr) = value {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
-        ExprKind::YieldFrom { value } => visitor.visit_expr(value),
+        ExprKind::YieldFrom { value } => visitor.visit_expr(value, None),
        ExprKind::Compare {
            left,
            ops,
            comparators,
        } => {
-            visitor.visit_expr(left);
+            visitor.visit_expr(left, None);
            for cmpop in ops {
                visitor.visit_cmpop(cmpop);
            }
            for expr in comparators {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::Call {
@@ -393,9 +335,9 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
            args,
            keywords,
        } => {
-            visitor.visit_expr(func);
+            visitor.visit_expr(func, None);
            for expr in args {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            for keyword in keywords {
                visitor.visit_keyword(keyword);
@@ -404,55 +346,54 @@ pub fn walk_expr<V: Visitor + ?Sized>(visitor: &mut V, expr: &Expr) {
        ExprKind::FormattedValue {
            value, format_spec, ..
        } => {
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, None);
            if let Some(expr) = format_spec {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::JoinedStr { values } => {
            for expr in values {
-                visitor.visit_expr(expr)
+                visitor.visit_expr(expr, None)
            }
        }
        ExprKind::Constant { value, .. } => visitor.visit_constant(value),
        ExprKind::Attribute { value, ctx, .. } => {
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, None);
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Subscript { value, slice, ctx } => {
-            visitor.visit_expr(value);
-            visitor.visit_expr(slice);
+            visitor.visit_expr(value, None);
+            visitor.visit_expr(slice, None);
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Starred { value, ctx } => {
-            visitor.visit_expr(value);
+            visitor.visit_expr(value, None);
            visitor.visit_expr_context(ctx);
        }
-        ExprKind::Name { id, ctx } => {
-            visitor.visit_ident(id);
+        ExprKind::Name { ctx, .. } => {
            visitor.visit_expr_context(ctx);
        }
        ExprKind::List { elts, ctx } => {
            for expr in elts {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Tuple { elts, ctx } => {
            for expr in elts {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            visitor.visit_expr_context(ctx);
        }
        ExprKind::Slice { lower, upper, step } => {
            if let Some(expr) = lower {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            if let Some(expr) = upper {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            if let Some(expr) = step {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
        }
    }
@@ -467,21 +408,18 @@ pub fn walk_constant<V: Visitor + ?Sized>(visitor: &mut V, constant: &Constant)
 }

 pub fn walk_comprehension<V: Visitor + ?Sized>(visitor: &mut V, comprehension: &Comprehension) {
-    visitor.visit_expr(&comprehension.target);
-    visitor.visit_expr(&comprehension.iter);
+    visitor.visit_expr(&comprehension.target, None);
+    visitor.visit_expr(&comprehension.iter, None);
    for expr in &comprehension.ifs {
-        visitor.visit_expr(expr);
+        visitor.visit_expr(expr, None);
    }
 }

 pub fn walk_excepthandler<V: Visitor + ?Sized>(visitor: &mut V, excepthandler: &Excepthandler) {
    match &excepthandler.node {
-        ExcepthandlerKind::ExceptHandler { type_, name, body } => {
+        ExcepthandlerKind::ExceptHandler { type_, body, .. } => {
            if let Some(expr) = type_ {
-                visitor.visit_expr(expr);
-            }
-            if let Some(ident) = name {
-                visitor.visit_ident(ident);
+                visitor.visit_expr(expr, None);
            }
            for stmt in body {
                visitor.visit_stmt(stmt);
@@ -504,13 +442,13 @@ pub fn walk_arguments<V: Visitor + ?Sized>(visitor: &mut V, arguments: &Argument
        visitor.visit_arg(arg);
    }
    for expr in &arguments.kw_defaults {
-        visitor.visit_expr(expr)
+        visitor.visit_expr(expr, None)
    }
    if let Some(arg) = &arguments.kwarg {
        visitor.visit_arg(arg)
    }
    for expr in &arguments.defaults {
-        visitor.visit_expr(expr)
+        visitor.visit_expr(expr, None)
    }
 }

@@ -521,20 +459,20 @@ pub fn walk_arg<V: Visitor + ?Sized>(visitor: &mut V, arg: &Arg) {
 }

 pub fn walk_keyword<V: Visitor + ?Sized>(visitor: &mut V, keyword: &Keyword) {
-    visitor.visit_expr(&keyword.node.value);
+    visitor.visit_expr(&keyword.node.value, None);
 }

 pub fn walk_withitem<V: Visitor + ?Sized>(visitor: &mut V, withitem: &Withitem) {
-    visitor.visit_expr(&withitem.context_expr);
+    visitor.visit_expr(&withitem.context_expr, None);
    if let Some(expr) = &withitem.optional_vars {
-        visitor.visit_expr(expr);
+        visitor.visit_expr(expr, None);
    }
 }

 pub fn walk_match_case<V: Visitor + ?Sized>(visitor: &mut V, match_case: &MatchCase) {
    visitor.visit_pattern(&match_case.pattern);
    if let Some(expr) = &match_case.guard {
-        visitor.visit_expr(expr);
+        visitor.visit_expr(expr, None);
    }
    for stmt in &match_case.body {
        visitor.visit_stmt(stmt);
@@ -543,57 +481,41 @@ pub fn walk_match_case<V: Visitor + ?Sized>(visitor: &mut V, match_case: &MatchC

 pub fn walk_pattern<V: Visitor + ?Sized>(visitor: &mut V, pattern: &Pattern) {
    match &pattern.node {
-        PatternKind::MatchValue { value } => visitor.visit_expr(value),
+        PatternKind::MatchValue { value } => visitor.visit_expr(value, None),
        PatternKind::MatchSingleton { value } => visitor.visit_constant(value),
        PatternKind::MatchSequence { patterns } => {
            for pattern in patterns {
                visitor.visit_pattern(pattern)
            }
        }
-        PatternKind::MatchMapping {
-            keys,
-            patterns,
-            rest,
-        } => {
+        PatternKind::MatchMapping { keys, patterns, .. } => {
            for expr in keys {
-                visitor.visit_expr(expr);
+                visitor.visit_expr(expr, None);
            }
            for pattern in patterns {
                visitor.visit_pattern(pattern);
            }
-            if let Some(ident) = rest {
-                visitor.visit_ident(ident);
-            }
        }
        PatternKind::MatchClass {
            cls,
            patterns,
-            kwd_attrs,
            kwd_patterns,
+            ..
        } => {
-            visitor.visit_expr(cls);
+            visitor.visit_expr(cls, None);
            for pattern in patterns {
                visitor.visit_pattern(pattern);
            }
-            for ident in kwd_attrs {
-                visitor.visit_ident(ident);
-            }
+
            for pattern in kwd_patterns {
                visitor.visit_pattern(pattern);
            }
        }
-        PatternKind::MatchStar { name } => {
-            if let Some(ident) = name {
-                visitor.visit_ident(ident)
-            }
-        }
-        PatternKind::MatchAs { pattern, name } => {
+        PatternKind::MatchStar { .. } => {}
+        PatternKind::MatchAs { pattern, .. } => {
            if let Some(pattern) = pattern {
                visitor.visit_pattern(pattern)
            }
-            if let Some(ident) = name {
-                visitor.visit_ident(ident)
-            }
        }
        PatternKind::MatchOr { patterns } => {
            for pattern in patterns {
@@ -604,22 +526,25 @@ pub fn walk_pattern<V: Visitor + ?Sized>(visitor: &mut V, pattern: &Pattern) {
 }

 #[allow(unused_variables)]
-pub fn walk_ident<V: Visitor + ?Sized>(visitor: &mut V, ident: &str) {}
-
-#[allow(unused_variables)]
+#[inline(always)]
 pub fn walk_expr_context<V: Visitor + ?Sized>(visitor: &mut V, expr_context: &ExprContext) {}

 #[allow(unused_variables)]
+#[inline(always)]
 pub fn walk_boolop<V: Visitor + ?Sized>(visitor: &mut V, boolop: &Boolop) {}

 #[allow(unused_variables)]
+#[inline(always)]
 pub fn walk_operator<V: Visitor + ?Sized>(visitor: &mut V, operator: &Operator) {}

 #[allow(unused_variables)]
+#[inline(always)]
 pub fn walk_unaryop<V: Visitor + ?Sized>(visitor: &mut V, unaryop: &Unaryop) {}

 #[allow(unused_variables)]
+#[inline(always)]
 pub fn walk_cmpop<V: Visitor + ?Sized>(visitor: &mut V, cmpop: &Cmpop) {}

 #[allow(unused_variables)]
+#[inline(always)]
 pub fn walk_alias<V: Visitor + ?Sized>(visitor: &mut V, alias: &Alias) {}
Author	SHA1	Message	Date
Charlie Marsh	55d1f34bae	Bump version to 0.0.29	2022-09-06 22:14:12 -04:00
Charlie Marsh	59b518a54a	Upgrade RustPython to handle AnnAssign (#117 )	2022-09-06 20:53:51 -04:00
Colin J. Fuller	74ecdc73ac	Handle E731 in type-annotated assignment (#116 )	2022-09-06 20:18:46 -04:00
Colin J. Fuller	1ad6be7196	Add fixture examples for #114 (#115 )	2022-09-06 20:18:05 -04:00
Charlie Marsh	b44d6c2c44	Bump version to 0.0.28	2022-09-06 14:20:02 -04:00
Charlie Marsh	2749660b1f	Disable update-informer on linux-cross (#113 )	2022-09-06 14:19:38 -04:00
Charlie Marsh	c1eeae90f1	Bump version to 0.0.27	2022-09-06 10:23:48 -04:00
Charlie Marsh	27025055ee	Implement E713 and E714 (#111 )	2022-09-06 10:23:20 -04:00
Charlie Marsh	e306fe0765	Implement E711 and E712 (#110 )	2022-09-06 10:14:36 -04:00
Harutaka Kawamura	5ffb9c08d5	Implement E731 (#109 )	2022-09-06 09:48:51 -04:00
Charlie Marsh	1a8940f015	Implement E902 (IOError) (#107 )	2022-09-05 13:15:12 -04:00
Charlie Marsh	45db571935	Bump version to 0.0.26	2022-09-05 12:28:27 -04:00
Charlie Marsh	198e5cf27f	Implement R002 (NoAssertEquals) (#98 )	2022-09-05 12:27:47 -04:00
Charlie Marsh	79b6472c7c	Add a note RE Black compat	2022-09-05 12:27:39 -04:00
Charlie Marsh	f902d25dc7	Implement ESLint-style fix for R0205 (#97 )	2022-09-05 12:16:06 -04:00
Charlie Marsh	826bdfeb63	Add utility scripts for AST printing (#105 )	2022-09-05 09:31:55 -04:00
Charlie Marsh	a3fb0d6c20	Remove custom serialization for Location (#104 )	2022-09-04 17:54:45 -04:00
Charlie Marsh	3cf9e3b201	Implement E402 (ModuleImportNotAtTopOfFile) (#102 )	2022-09-04 16:20:36 -04:00
Charlie Marsh	533b4e752b	Reduce ignores in CPython benchmark	2022-09-04 16:13:35 -04:00
Charlie Marsh	cf45d520e6	Fix failing test	2022-09-04 12:02:21 -04:00
Harutaka Kawamura	b86414dc7a	Implement F707 (DefaultExceptNotLast) (#101 )	2022-09-04 11:55:06 -04:00
Charlie Marsh	8f6ab8b37a	Fix formatting of some rule messages	2022-09-04 09:52:31 -04:00
Harutaka Kawamura	312bfd8d2b	Implement F631 (AssertTuple) (#99 )	2022-09-04 08:39:49 -04:00
Harutaka Kawamura	e2f46537fd	Fix false positive for `IfTuple` (#96 )	2022-09-03 22:56:55 -04:00
Charlie Marsh	97cc30768d	Fix typo in enforce_line_too_long	2022-09-03 16:32:15 -04:00
Grachev Mikhail	d580f2eb90	Check for updates (#90 )	2022-09-03 16:31:44 -04:00
Dmitry Dygalo	507fecfd9a	perf: Avoid `Vec<&str>` allocation during line length checking (#95 )	2022-09-03 16:27:18 -04:00
Charlie Marsh	4319bd1755	Bump version to 0.0.25	2022-09-03 12:09:11 -04:00
Charlie Marsh	6bb6cb1783	Implement F822 (#94 )	2022-09-03 12:08:26 -04:00
Charlie Marsh	e9412c9452	Generate a list of supported lint rules (#93 )	2022-09-03 11:56:11 -04:00
Charlie Marsh	94faa7f301	Rename resources/test/src to resources/test/fixtures (#92 )	2022-09-03 11:49:03 -04:00
Charlie Marsh	5041f6530c	Implement R0205 (#91 )	2022-09-03 11:33:54 -04:00
Narawit Rakket	3c7716ef27	refactor: run `cargo clippy --fix` (#88 )	2022-09-02 17:01:24 -04:00
Charlie Marsh	26e1f4b6df	Bump version to 0.0.24	2022-09-02 10:18:40 -04:00
Charlie Marsh	17c08523dc	Remove rogue println	2022-09-02 10:18:12 -04:00
Charlie Marsh	221f4304ad	Add support for __all__ export bindings (#87 )	2022-09-02 10:17:31 -04:00
Charlie Marsh	c0131e65e5	Avoid putting decorators in the function scope (#86 )	2022-09-02 09:13:06 -04:00
Charlie Marsh	bf4722a62f	Fix future-to-__future__ typo (#85 )	2022-09-02 08:56:26 -04:00
Charlie Marsh	994f5d452c	Update .gitignore	2022-09-01 20:32:32 -04:00
Nikita Sobolev	741857cdf9	Use the latest version of `actions/checkout` (#79 )	2022-09-01 13:18:31 -04:00
Ariel Richtman	4f42f51bd2	Add pre-commit hook (#55 )	2022-09-01 13:01:28 -04:00
Dmitry Dygalo	5a3092e805	perf: Compile `Regex` once (#77 )	2022-09-01 12:49:29 -04:00
Charlie Marsh	0318406535	Re-sort lint rules	2022-09-01 12:39:25 -04:00
Sekky61	0c99b5aac5	Fix F832 --> F823 typo (#73 )	2022-09-01 12:37:34 -04:00
Kian-Meng Ang	b442402b13	Prettify md/yaml files (#74 )	2022-09-01 12:36:47 -04:00
Charlie Marsh	ba27e50164	Bump version to 0.0.23	2022-09-01 09:21:43 -04:00
Charlie Marsh	d55651d470	Rename cache to .ruff_cache	2022-09-01 09:19:32 -04:00
Charlie Marsh	0c110bcecf	Add some user-visible logging when pyproject.toml fails to parse	2022-09-01 09:18:47 -04:00
Patrick Haller	9bf8a0d0f1	Check if toml file is parsed correctly (#71 )	2022-09-01 09:15:07 -04:00
Eric Hagman	888cfeba35	Remove .to_string() from F634 error message (#67 )	2022-09-01 09:08:48 -04:00
Charlie Marsh	64df4eb311	Bump version to 0.0.22	2022-08-31 19:12:31 -04:00
Charlie Marsh	2bac3027a5	Implement F704 (#66 )	2022-08-31 19:11:59 -04:00
Charlie Marsh	c28ac75591	Implement F841 (for functions) (#65 )	2022-08-31 19:11:26 -04:00
Charlie Marsh	59f009b52d	Enable globs in excludes list (#64 )	2022-08-31 18:53:13 -04:00
Charlie Marsh	b5edcee9f2	Implement F841 (for exception handlers) (#63 )	2022-08-31 18:40:34 -04:00
Charlie Marsh	3f739214b4	Bind excepthandler names (#62 )	2022-08-31 18:16:37 -04:00
Charlie Marsh	0b9e3f8b47	Minor formatting changes	2022-08-31 12:38:23 -04:00
Charlie Marsh	556ae00078	Bump version to 0.0.21	2022-08-31 11:25:46 -04:00
Charlie Marsh	adad214619	Handle submodule imports for F401 (#58 )	2022-08-31 11:24:25 -04:00
Charlie Marsh	0ebed13e67	Sort messages prior to display (#56 )	2022-08-31 10:53:35 -04:00
Charlie Marsh	3afedcd48b	Upgrade parser to handle more F821 cases (#57 )	2022-08-31 10:52:54 -04:00
Charlie Marsh	875e812188	Disable build-on-push for now	2022-08-31 10:45:41 -04:00
Charlie Marsh	80f3cd0ef7	Don't assume errors appear in-order with line contents	2022-08-31 08:40:38 -04:00
Dmitry Dygalo	9e3c35e6dc	Improve search for duplicates (#53 )	2022-08-31 08:23:43 -04:00