Bump version to 0.0.83

Increment flake8-bugbear to 6/32
Implement B002 (unary prefix increment) (#468 )
2022-10-25 21:24:13 -04:00 · 2022-10-25 21:23:13 -04:00 · 2022-10-25 21:10:51 -04:00 · 2022-10-25 20:55:00 -04:00 · 2022-10-25 08:02:11 -04:00 · 2022-10-24 15:16:56 -04:00
254 changed files with 9699 additions and 5332 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -418,9 +418,9 @@ checksum = "fff857943da45f546682664a79488be82e69e43c1a7a2307679ab9afb3a66d2e"

 [[package]]
 name = "clap"
-version = "4.0.9"
+version = "4.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30607dd93c420c6f1f80b544be522a0238a7db35e6a12968d28910983fee0df0"
+checksum = "6bf8832993da70a4c6d13c581f4463c2bdda27b9bf1c5498dc4365543abe6d6f"
 dependencies = [
 "atty",
 "bitflags",
@@ -433,9 +433,9 @@ dependencies = [

 [[package]]
 name = "clap_derive"
-version = "4.0.9"
+version = "4.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4a307492e1a34939f79d3b6b9650bd2b971513cd775436bf2b78defeb5af00b"
+checksum = "c42f169caba89a7d512b5418b09864543eeb4d497416c917d7137863bd2076ad"
 dependencies = [
 "heck",
 "proc-macro-error",
@@ -466,6 +466,16 @@ dependencies = [
 "winapi 0.3.9",
 ]

+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "colored"
 version = "2.0.0"
@@ -588,6 +598,50 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "cxx"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19f39818dcfc97d45b03953c1292efc4e80954e1583c4aa770bac1383e2310a4"
+dependencies = [
+ "cc",
+ "cxxbridge-flags",
+ "cxxbridge-macro",
+ "link-cplusplus",
+]
+
+[[package]]
+name = "cxx-build"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e580d70777c116df50c390d1211993f62d40302881e54d4b79727acb83d0199"
+dependencies = [
+ "cc",
+ "codespan-reporting",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "scratch",
+ "syn",
+]
+
+[[package]]
+name = "cxxbridge-flags"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56a46460b88d1cec95112c8c363f0e2c39afdb237f60583b0b36343bf627ea9c"
+
+[[package]]
+name = "cxxbridge-macro"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "747b608fecf06b0d72d440f27acc99288207324b793be2c17991839f3d4995ea"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "diff"
 version = "0.1.13"
@@ -954,8 +1008,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
 dependencies = [
 "cfg-if 1.0.0",
+ "js-sys",
 "libc",
 "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasm-bindgen",
 ]

 [[package]]
@@ -981,6 +1037,9 @@ name = "hashbrown"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash",
+]

 [[package]]
 name = "heck"
@@ -1017,17 +1076,28 @@ checksum = "dfa686283ad6dd069f105e5ab091b04c62850d3e4cf5d67debad1933f55023df"

 [[package]]
 name = "iana-time-zone"
-version = "0.1.50"
+version = "0.1.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd911b35d940d2bd0bea0f9100068e5b97b51a1cbe13d13382f132e0365257a0"
+checksum = "f5a6ef98976b22b3b7f2f3a806f858cb862044cfa66805aa3ad84cb3d3b785ed"
 dependencies = [
 "android_system_properties",
 "core-foundation-sys",
+ "iana-time-zone-haiku",
 "js-sys",
 "wasm-bindgen",
 "winapi 0.3.9",
 ]

+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fde6edd6cef363e9359ed3c98ba64590ba9eecba2293eb5a723ab32aee8926aa"
+dependencies = [
+ "cxx",
+ "cxx-build",
+]
+
 [[package]]
 name = "idna"
 version = "0.3.0"
@@ -1111,9 +1181,15 @@ dependencies = [

 [[package]]
 name = "itoa"
-version = "1.0.3"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8af84674fe1f223a982c933a0ee1086ac4d4052aa0fb8060c12c6ad838e754"
+checksum = "4217ad341ebadf8d8e724e264f13e593e0648f5b3e94b3896a5df283be015ecc"
+
+[[package]]
+name = "joinery"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72167d68f5fce3b8655487b8038691a3c9984ee769590f93f2a631f4ad64e4f5"

 [[package]]
 name = "js-sys"
@@ -1219,9 +1295,9 @@ dependencies = [

 [[package]]
 name = "libc"
-version = "0.2.134"
+version = "0.2.135"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "329c933548736bc49fd575ee68c89e8be4d260064184389a5b77517cddd99ffb"
+checksum = "68783febc7782c6c5cb401fbda4de5a9898be1762314da0bb2c10ced61f18b0c"

 [[package]]
 name = "libcst"
@@ -1247,6 +1323,15 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "link-cplusplus"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9272ab7b96c9046fbc5bc56c06c117cb639fe2d509df0c421cad82d2915cf369"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "linked-hash-map"
 version = "0.5.6"
@@ -1532,18 +1617,18 @@ checksum = "b1de2e551fb905ac83f73f7aedf2f0cb4a0da7e35efa24a202a936269f1f18e1"

 [[package]]
 name = "path-absolutize"
-version = "3.0.13"
+version = "3.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3de4b40bd9736640f14c438304c09538159802388febb02c8abaae0846c1f13"
+checksum = "0f1d4993b16f7325d90c18c3c6a3327db7808752db8d208cea0acee0abd52c52"
 dependencies = [
 "path-dedot",
 ]

 [[package]]
 name = "path-dedot"
-version = "3.0.17"
+version = "3.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d611d5291372b3738a34ebf0d1f849e58b1dcc1101032f76a346eaa1f8ddbb5b"
+checksum = "9a81540d94551664b72b72829b12bd167c73c9d25fbac0e04fafa8023f7e4901"
 dependencies = [
 "once_cell",
 ]
@@ -1960,7 +2045,7 @@ dependencies = [

 [[package]]
 name = "ruff"
-version = "0.0.70"
+version = "0.0.83"
 dependencies = [
 "anyhow",
 "assert_cmd",
@@ -1974,6 +2059,7 @@ dependencies = [
 "dirs 4.0.0",
 "fern",
 "filetime",
+ "getrandom 0.2.7",
 "glob",
 "insta",
 "itertools",
@@ -1992,6 +2078,9 @@ dependencies = [
 "serde_json",
 "strum",
 "strum_macros",
+ "test-case",
+ "textwrap",
+ "titlecase",
 "toml",
 "update-informer",
 "walkdir",
@@ -2012,7 +2101,7 @@ dependencies = [
 [[package]]
 name = "rustpython-ast"
 version = "0.1.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f#778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
 dependencies = [
 "num-bigint",
 "rustpython-common",
@@ -2022,7 +2111,7 @@ dependencies = [
 [[package]]
 name = "rustpython-common"
 version = "0.0.0"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f#778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
 dependencies = [
 "ascii",
 "cfg-if 1.0.0",
@@ -2045,7 +2134,7 @@ dependencies = [
 [[package]]
 name = "rustpython-compiler-core"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f#778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
 dependencies = [
 "bincode",
 "bitflags",
@@ -2062,7 +2151,7 @@ dependencies = [
 [[package]]
 name = "rustpython-parser"
 version = "0.1.2"
-source = "git+https://github.com/charliermarsh/RustPython.git?rev=778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f#778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f"
+source = "git+https://github.com/charliermarsh/RustPython.git?rev=1b253a12705f84972cd76e8dc1cdaaccb233e5a5#1b253a12705f84972cd76e8dc1cdaaccb233e5a5"
 dependencies = [
 "ahash",
 "anyhow",
@@ -2110,6 +2199,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"

+[[package]]
+name = "scratch"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8132065adcfd6e02db789d9285a0deb2f3fcb04002865ab67d5fb103533898"
+
 [[package]]
 name = "sct"
 version = "0.7.0"
@@ -2148,9 +2243,9 @@ dependencies = [

 [[package]]
 name = "serde_json"
-version = "1.0.85"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e55a28e3aaef9d5ce0506d0a14dbba8054ddc7e499ef522dd8b26859ec9d4a44"
+checksum = "41feea4228a6f1cd09ec7a3593a682276702cd67b5273544757dae23c096f074"
 dependencies = [
 "itoa",
 "ryu",
@@ -2253,6 +2348,12 @@ version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"

+[[package]]
+name = "smawk"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f67ad224767faa3c7d8b6d91985b78e70a1324408abcb1cfcc2be4c06bc06043"
+
 [[package]]
 name = "socket2"
 version = "0.4.7"
@@ -2333,9 +2434,9 @@ dependencies = [

 [[package]]
 name = "syn"
-version = "1.0.101"
+version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "3fcd952facd492f9be3ef0d0b7032a6e442ee9b361d4acc2b1d0c4aaa5f613a1"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -2405,6 +2506,39 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "507e9898683b6c43a9aa55b64259b721b52ba226e0f3779137e50ad114a4c90b"

+[[package]]
+name = "test-case"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21d6cf5a7dffb3f9dceec8e6b8ca528d9bd71d36c9f074defb548ce161f598c0"
+dependencies = [
+ "test-case-macros",
+]
+
+[[package]]
+name = "test-case-macros"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e45b7bf6e19353ddd832745c8fcf77a17a93171df7151187f26623f2b75b5b26"
+dependencies = [
+ "cfg-if 1.0.0",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.15.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "949517c0cf1bf4ee812e2e07e08ab448e3ae0d23472aee8a06c985f0c8815b16"
+dependencies = [
+ "smawk",
+ "unicode-linebreak",
+ "unicode-width",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.37"
@@ -2460,6 +2594,17 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"

+[[package]]
+name = "titlecase"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38397a8cdb017cfeb48bf6c154d6de975ac69ffeed35980fde199d2ee0842042"
+dependencies = [
+ "joinery",
+ "lazy_static",
+ "regex",
+]
+
 [[package]]
 name = "toml"
 version = "0.5.9"
@@ -2557,9 +2702,19 @@ checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"

 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
+
+[[package]]
+name = "unicode-linebreak"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5faade31a542b8b35855fff6e8def199853b2da8da256da52f52f1316ee3137"
+dependencies = [
+ "hashbrown",
+ "regex",
+]

 [[package]]
 name = "unicode-normalization"
@@ -2570,6 +2725,12 @@ dependencies = [
 "tinyvec",
 ]

+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.4"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruff"
-version = "0.0.70"
+version = "0.0.83"
 edition = "2021"

 [lib]
@@ -9,10 +9,8 @@ name = "ruff"
 [dependencies]
 anyhow = { version = "1.0.60" }
 bincode = { version = "1.3.3" }
-cacache = { version = "10.0.1" }
 chrono = { version = "0.4.21" }
 clap = { version = "4.0.1", features = ["derive"] }
-clearscreen = { version = "1.0.10" }
 colored = { version = "2.0.0" }
 common-path = { version = "1.0.0" }
 dirs = { version = "4.0.0" }
@@ -23,25 +21,37 @@ itertools = { version = "0.10.5" }
 libcst = { git = "https://github.com/charliermarsh/LibCST", rev = "32a044c127668df44582f85699358e67803b0d73" }
 log = { version = "0.4.17" }
 notify = { version = "4.0.17" }
+num-bigint = { version = "0.4.3" }
 once_cell = { version = "1.13.1" }
-path-absolutize = { version = "3.0.13", features = ["once_cell_cache"] }
+path-absolutize = { version = "3.0.14", features = ["once_cell_cache", "use_unix_paths_on_wasm"] }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-ast = { features = ["unparse"], git = "https://github.com/charliermarsh/RustPython.git", rev = "778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f" }
-rustpython-common = { git = "https://github.com/charliermarsh/RustPython.git", rev = "778ae2aeb521d0438d2a91bd11238bb5c2bf9d4f" }
+rustpython-ast = { features = ["unparse"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
+rustpython-common = { git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "1b253a12705f84972cd76e8dc1cdaaccb233e5a5" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
+strum = { version = "0.24.1", features = ["strum_macros"] }
+strum_macros = { version = "0.24.3" }
+textwrap = { version = "0.15.1" }
+titlecase = { version = "2.2.1" }
 toml = { version = "0.5.9" }
 update-informer = { version = "0.5.0", default_features = false, features = ["pypi"], optional = true }
 walkdir = { version = "2.3.2" }
-strum = { version = "0.24.1", features = ["strum_macros"] }
-strum_macros = "0.24.3"
-num-bigint = "0.4.3"
+
+[target.'cfg(not(target_family = "wasm"))'.dependencies]
+cacache = { version = "10.0.1" } # uses async-std
+clearscreen = { version = "1.0.10" } # uses which
+
+# https://docs.rs/getrandom/0.2.7/getrandom/#webassembly-support
+# For (future) wasm-pack support
+[target.'cfg(all(target_family = "wasm", target_os = "unknown"))'.dependencies]
+getrandom = { version = "0.2.7", features = ["js"] }

 [dev-dependencies]
-assert_cmd = "2.0.4"
+assert_cmd = { version = "2.0.4" }
 insta = { version = "1.19.1", features = ["yaml"] }
+test-case = { version = "2.2.2" }

 [features]
 default = ["update-informer"]
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# ruff
+# Ruff

 [![image](https://img.shields.io/pypi/v/ruff.svg)](https://pypi.python.org/pypi/ruff)
 [![image](https://img.shields.io/pypi/l/ruff.svg)](https://pypi.python.org/pypi/ruff)
@@ -20,17 +20,37 @@ An extremely fast Python linter, written in Rust.
 - 🤝 Python 3.10 compatibility
 - 🛠️ `pyproject.toml` support
 - 📦 [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#--fix)-inspired `--fix` support
- 👀 [TypeScript](https://www.typescriptlang.org/docs/handbook/configuring-watch.html)-inspired `--watch` support
- ⚖️ [Near-complete parity](#Parity-with-Flake8) with the built-in Flake8 rule set
+- 🔧 [ESLint](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix)-inspired autofix support (e.g., automatically remove unused imports)
+- 👀 [TypeScript](https://www.typescriptlang.org/docs/handbook/configuring-watch.html)-inspired `--watch` support, for continuous file monitoring
+- ⚖️ [Near-parity](#how-does-ruff-compare-to-flake8) with the built-in Flake8 rule set
+- 🔌 Native re-implementations of popular Flake8 plugins, like [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/) ([`pydocstyle`](https://pypi.org/project/pydocstyle/))
+
+Ruff aims to be orders of magnitude faster than alternative tools while integrating more
+functionality behind a single, common interface. Ruff can be used to replace Flake8 (plus a variety
+of plugins), [`pydocstyle`](https://pypi.org/project/pydocstyle/), [`yesqa`](https://github.com/asottile/yesqa),
+and even a subset of [`pyupgrade`](https://pypi.org/project/pyupgrade/) and [`autoflake`](https://pypi.org/project/autoflake/)
+all while executing tens or hundreds of times faster than any individual tool.

 Read the [launch blog post](https://notes.crmarsh.com/python-tooling-could-be-much-much-faster).

-## Installation and usage
+## Table of Contents
+
+1. [Installation and Usage](#installation-and-usage)
+2. [Configuration](#configuration)
+3. [Supported Rules](#supported-rules)
+4. [Editor Integrations](#editor-integrations)
+5. [FAQ](#faq)
+6. [Development](#development)
+7. [Releases](#releases)
+8. [Benchmarks](#benchmarks)
+9. [License](#license)
+10. [Contributing](#contributing)
+
+## Installation and Usage

 ### Installation

-Available as [ruff](https://pypi.org/project/ruff/) on PyPI:
+Available as [`ruff`](https://pypi.org/project/ruff/) on PyPI:

 ```shell
 pip install ruff
@@ -38,7 +58,7 @@ pip install ruff

 ### Usage

-To run ruff, try any of the following:
+To run Ruff, try any of the following:

 ```shell
 ruff path/to/code/to/check.py
@@ -46,27 +66,27 @@ ruff path/to/code/
 ruff path/to/code/*.py
 ```

-You can run ruff in `--watch` mode to automatically re-run on-change:
+You can run Ruff in `--watch` mode to automatically re-run on-change:

 ```shell
 ruff path/to/code/ --watch
 ```

-ruff also works with [pre-commit](https://pre-commit.com):
+Ruff also works with [pre-commit](https://pre-commit.com):

 ```yaml
 repos:
  - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.70
+    rev: v0.0.83
    hooks:
      - id: lint
 ```

 ## Configuration

-ruff is configurable both via `pyproject.toml` and the command line.
+Ruff is configurable both via `pyproject.toml` and the command line.

-For example, you could configure ruff to only enforce a subset of rules with:
+For example, you could configure Ruff to only enforce a subset of rules with:

 ```toml
 [tool.ruff]
@@ -94,6 +114,8 @@ Arguments:
  <FILES>...

 Options:
+      --config <CONFIG>
+          Path to the `pyproject.toml` file to use for configuration
  -v, --verbose
          Enable verbose logging
  -q, --quiet
@@ -132,6 +154,8 @@ Options:
          Regular expression matching the name of dummy variables
      --target-version <TARGET_VERSION>
          The minimum Python version that should be supported
+      --stdin-filename <STDIN_FILENAME>
+          The name of the file when passing it through stdin
  -h, --help
          Print help information
  -V, --version
@@ -154,7 +178,7 @@ Exclusions are based on globs, and can be either:
 To omit a lint check entirely, add it to the "ignore" list via `--ignore` or `--extend-ignore`,
 either  on the command-line or in your `project.toml` file.

-To ignore an error in-line, ruff uses a `noqa` system similar to [Flake8](https://flake8.pycqa.org/en/3.1.1/user/ignoring-errors.html).
+To ignore an error in-line, Ruff uses a `noqa` system similar to [Flake8](https://flake8.pycqa.org/en/3.1.1/user/ignoring-errors.html).
 To ignore an individual error, add `# noqa: {code}` to the end of the line, like so:

 ```python
@@ -178,177 +202,228 @@ Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor i
 """  # noqa: E501
 ```

-ruff supports several (experimental) workflows to aid in `noqa` management.
+Ruff supports several workflows to aid in `noqa` management.

-First, ruff provides a special error code, `M001`, to enforce that your `noqa` directives are
+First, Ruff provides a special error code, `M001`, to enforce that your `noqa` directives are
 "valid", in that the errors they _say_ they ignore are actually being triggered on that line (and
 thus suppressed). **You can run `ruff /path/to/file.py --extend-select M001` to flag unused `noqa`
 directives.**

-Second, ruff can _automatically remove_ unused `noqa` directives via its autofix functionality.
+Second, Ruff can _automatically remove_ unused `noqa` directives via its autofix functionality.
 **You can run `ruff /path/to/file.py --extend-select M001 --fix` to automatically remove unused
 `noqa` directives.**

-Third, ruff can _automatically add_ `noqa` directives to all failing lines. This is useful when
-migrating a new codebase to ruff. **You can run `ruff /path/to/file.py --add-noqa` to automatically
+Third, Ruff can _automatically add_ `noqa` directives to all failing lines. This is useful when
+migrating a new codebase to Ruff. **You can run `ruff /path/to/file.py --add-noqa` to automatically
 add `noqa` directives to all failing lines, with the appropriate error codes.**

-### Compatibility with Black
+## Supported Rules

-ruff is compatible with [Black](https://github.com/psf/black) 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
-stylistic lint rules that are obviated by autoformatting.
-
-### Parity with Flake8
-
-ruff's goal is to achieve feature parity with Flake8 when used (1) without plugins, (2) alongside
-Black, and (3) on Python 3 code.
-
-**Under those conditions, ruff implements 44 out of 60 rules.** (ruff is missing: 14 rules related
-to string `.format` calls, 1 rule related to docstring parsing, and 1 rule related to redefined
-variables.)
-
-ruff also implements some of the most popular Flake8 plugins natively, including:
-
- [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
- [`flake8-super`](https://pypi.org/project/flake8-super/)
- [`flake8-print`](https://pypi.org/project/flake8-print/)
- [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/) (12/16)
- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (3/32)
- [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/) (25/48)
- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34)
-
-Beyond rule-set parity, ruff suffers from the following limitations vis-à-vis Flake8:
-
-1. ruff does not yet support a few Python 3.9 and 3.10 language features, including structural
-   pattern matching and parenthesized context managers.
-2. Flake8 has a plugin architecture and supports writing custom lint rules.
-
-## Rules
-
-The ✅ emoji indicates a rule is enabled by default.
+By default, Ruff enables all `E`, `W`, and `F` error codes, which correspond to those built-in to
+Flake8.

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

-| Code | Name | Message |     |     |
-| ---- | ---- | ------- | --- | --- |
-| E402 | ModuleImportNotAtTopOfFile | Module level import not at top of file | ✅ |  |
-| E501 | LineTooLong | Line too long (89 > 88 characters) | ✅ |  |
-| 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` | ✅ |  |
-| E721 | TypeComparison | Do not compare types, use `isinstance()` | ✅ |  |
-| E722 | DoNotUseBareExcept | Do not use bare `except` | ✅ |  |
-| E731 | DoNotAssignLambda | Do not assign a lambda expression, use a def | ✅ |  |
-| E741 | AmbiguousVariableName | Ambiguous variable name: `...` | ✅ |  |
-| E742 | AmbiguousClassName | Ambiguous class name: `...` | ✅ |  |
-| E743 | AmbiguousFunctionName | Ambiguous function name: `...` | ✅ |  |
-| E902 | IOError | IOError: `...` | ✅ |  |
-| E999 | SyntaxError | SyntaxError: `...` | ✅ |  |
-| W292 | NoNewLineAtEndOfFile | No newline at end of file | ✅ |  |
-| F401 | UnusedImport | `...` imported but unused | ✅ | 🛠 |
-| F402 | ImportShadowedByLoopVar | Import `...` from line 1 shadowed by loop variable | ✅ |  |
-| F403 | ImportStarUsed | `from ... import *` used; unable to detect undefined names | ✅ |  |
-| F404 | LateFutureImport | `from __future__` imports must occur at the beginning of the file | ✅ |  |
-| F405 | ImportStarUsage | `...` may be undefined, or defined from star imports: `...` | ✅ |  |
-| F406 | ImportStarNotPermitted | `from ... import *` only allowed at module level | ✅ |  |
-| F407 | FutureFeatureNotDefined | Future feature `...` is not defined | ✅ |  |
-| F541 | FStringMissingPlaceholders | f-string without any placeholders | ✅ |  |
-| F601 | MultiValueRepeatedKeyLiteral | Dictionary key literal repeated | ✅ |  |
-| F602 | MultiValueRepeatedKeyVariable | Dictionary key `...` repeated | ✅ |  |
-| F621 | ExpressionsInStarAssignment | Too many expressions in star-unpacking assignment | ✅ |  |
-| F622 | TwoStarredExpressions | Two starred expressions in assignment | ✅ |  |
-| F631 | AssertTuple | Assert test is a non-empty tuple, which is always `True` | ✅ |  |
-| F632 | IsLiteral | Use `==` and `!=` to compare constant literals | ✅ |  |
-| F633 | InvalidPrintSyntax | Use of `>>` is invalid with `print` function | ✅ |  |
-| F634 | IfTuple | If test is a tuple, which is always `True` | ✅ |  |
-| F701 | BreakOutsideLoop | `break` outside loop | ✅ |  |
-| F702 | ContinueOutsideLoop | `continue` not properly in loop | ✅ |  |
-| F704 | YieldOutsideFunction | `yield` or `yield from` statement outside of a function/method | ✅ |  |
-| F706 | ReturnOutsideFunction | `return` statement outside of a function/method | ✅ |  |
-| F707 | DefaultExceptNotLast | An `except:` block as not the last exception handler | ✅ |  |
-| F722 | ForwardAnnotationSyntaxError | Syntax error in forward annotation: `...` | ✅ |  |
-| 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` | ✅ |  |
-| A001 | BuiltinVariableShadowing | Variable `...` is shadowing a python builtin |  |  |
-| A002 | BuiltinArgumentShadowing | Argument `...` is shadowing a python builtin |  |  |
-| A003 | BuiltinAttributeShadowing | Class attribute `...` is shadowing a python builtin |  |  |
-| B011 | DoNotAssertFalse | Do not `assert False` (`python -O` removes these calls), raise `AssertionError()` |  | 🛠 |
-| B014 | DuplicateHandlerException | Exception handler with duplicate exception: `ValueError` |  | 🛠 |
-| B025 | DuplicateTryBlockException | try-except block with duplicate exception `Exception` |  |  |
-| C400 | UnnecessaryGeneratorList | Unnecessary generator - rewrite as a list comprehension |  |  |
-| C401 | UnnecessaryGeneratorSet | Unnecessary generator - rewrite as a set comprehension |  |  |
-| C402 | UnnecessaryGeneratorDict | Unnecessary generator - rewrite as a dict comprehension |  |  |
-| C403 | UnnecessaryListComprehensionSet | Unnecessary list comprehension - rewrite as a set comprehension |  |  |
-| C404 | UnnecessaryListComprehensionDict | Unnecessary list comprehension - rewrite as a dict comprehension |  |  |
-| C405 | UnnecessaryLiteralSet | Unnecessary <list/tuple> literal - rewrite as a set literal |  |  |
-| C406 | UnnecessaryLiteralDict | Unnecessary <list/tuple> literal - rewrite as a dict literal |  |  |
-| C408 | UnnecessaryCollectionCall | Unnecessary <dict/list/tuple> call - rewrite as a literal |  |  |
-| C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary <list/tuple> literal passed to tuple() - remove the outer call to tuple() |  |  |
-| C410 | UnnecessaryLiteralWithinListCall | Unnecessary <list/tuple> literal passed to list() - rewrite as a list literal |  |  |
-| C414 | UnnecessaryDoubleCastOrProcess | Unnecessary <list/reversed/set/sorted/tuple> call within <list/set/sorted/tuple>(). |  |  |
-| C415 | UnnecessarySubscriptReversal | Unnecessary subscript reversal of iterable within <reversed/set/sorted>() |  |  |
-| T201 | PrintFound | `print` found |  | 🛠 |
-| T203 | PPrintFound | `pprint` found |  | 🛠 |
-| U001 | UselessMetaclassType | `__metaclass__ = type` is implied |  | 🛠 |
-| U002 | UnnecessaryAbspath | `abspath(__file__)` is unnecessary in Python 3.9 and later |  | 🛠 |
-| U003 | TypeOfPrimitive | Use `str` instead of `type(...)` |  | 🛠 |
-| U004 | UselessObjectInheritance | Class `...` inherits from object |  | 🛠 |
-| U005 | DeprecatedUnittestAlias | `assertEquals` is deprecated, use `assertEqual` instead |  | 🛠 |
-| U006 | UsePEP585Annotation | Use `list` instead of `List` for type annotations |  | 🛠 |
-| U007 | UsePEP604Annotation | Use `X \| Y` for type annotations |  | 🛠 |
-| U008 | SuperCallWithParameters | Use `super()` instead of `super(__class__, self)` |  | 🛠 |
-| D100 | PublicModule | Missing docstring in public module |  |  |
-| D101 | PublicClass | Missing docstring in public class |  |  |
-| D102 | PublicMethod | Missing docstring in public method |  |  |
-| D103 | PublicFunction | Missing docstring in public function |  |  |
-| D104 | PublicPackage | Missing docstring in public package |  |  |
-| D105 | MagicMethod | Missing docstring in magic method |  |  |
-| D106 | PublicNestedClass | Missing docstring in public nested class |  |  |
-| D107 | PublicInit | Missing docstring in __init__ |  |  |
-| D200 | FitsOnOneLine | One-line docstring should fit on one line |  |  |
-| D205 | NoBlankLineAfterSummary | 1 blank line required between summary line and description |  |  |
-| D209 | NewLineAfterLastParagraph | Multi-line docstring closing quotes should be on a separate line |  |  |
-| D210 | NoSurroundingWhitespace | No whitespaces allowed surrounding docstring text |  |  |
-| D212 | MultiLineSummaryFirstLine | Multi-line docstring summary should start at the first line |  |  |
-| D213 | MultiLineSummarySecondLine | Multi-line docstring summary should start at the second line |  |  |
-| D300 | UsesTripleQuotes | Use """triple double quotes""" |  |  |
-| D400 | EndsInPeriod | First line should end with a period |  |  |
-| D402 | NoSignature | First line should not be the function's 'signature' |  |  |
-| D403 | FirstLineCapitalized | First word of the first line should be properly capitalized |  |  |
-| D415 | EndsInPunctuation | First line should end with a period, question mark, or exclamation point |  |  |
-| D419 | NonEmpty | Docstring is empty |  |  |
-| D201 | NoBlankLineBeforeFunction | No blank lines allowed before function docstring (found 1) |  |  |
-| D202 | NoBlankLineAfterFunction | No blank lines allowed after function docstring (found 1) |  |  |
-| D211 | NoBlankLineBeforeClass | No blank lines allowed before class docstring |  |  |
-| D203 | OneBlankLineBeforeClass | 1 blank line required before class docstring |  |  |
-| D204 | OneBlankLineAfterClass | 1 blank line required after class docstring |  |  |
-| M001 | UnusedNOQA | Unused `noqa` directive |  | 🛠 |
+### Pyflakes

-## Integrations
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| F401 | UnusedImport | `...` imported but unused | 🛠 |
+| F402 | ImportShadowedByLoopVar | Import `...` from line 1 shadowed by loop variable |  |
+| F403 | ImportStarUsed | `from ... import *` used; unable to detect undefined names |  |
+| F404 | LateFutureImport | `from __future__` imports must occur at the beginning of the file |  |
+| F405 | ImportStarUsage | `...` may be undefined, or defined from star imports: `...` |  |
+| F406 | ImportStarNotPermitted | `from ... import *` only allowed at module level |  |
+| F407 | FutureFeatureNotDefined | Future feature `...` is not defined |  |
+| F541 | FStringMissingPlaceholders | f-string without any placeholders |  |
+| F601 | MultiValueRepeatedKeyLiteral | Dictionary key literal repeated |  |
+| F602 | MultiValueRepeatedKeyVariable | Dictionary key `...` repeated |  |
+| F621 | ExpressionsInStarAssignment | Too many expressions in star-unpacking assignment |  |
+| F622 | TwoStarredExpressions | Two starred expressions in assignment |  |
+| F631 | AssertTuple | Assert test is a non-empty tuple, which is always `True` |  |
+| F632 | IsLiteral | Use `==` and `!=` to compare constant literals |  |
+| F633 | InvalidPrintSyntax | Use of `>>` is invalid with `print` function |  |
+| F634 | IfTuple | If test is a tuple, which is always `True` |  |
+| F701 | BreakOutsideLoop | `break` outside loop |  |
+| F702 | ContinueOutsideLoop | `continue` not properly in loop |  |
+| F704 | YieldOutsideFunction | `yield` or `yield from` statement outside of a function/method |  |
+| F706 | ReturnOutsideFunction | `return` statement outside of a function/method |  |
+| F707 | DefaultExceptNotLast | An `except:` block as not the last exception handler |  |
+| F722 | ForwardAnnotationSyntaxError | Syntax error in forward annotation: `...` |  |
+| 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` |  |
+
+### pycodestyle
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| E402 | ModuleImportNotAtTopOfFile | Module level import not at top of file |  |
+| E501 | LineTooLong | Line too long (89 > 88 characters) |  |
+| 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` |  |
+| E721 | TypeComparison | Do not compare types, use `isinstance()` |  |
+| E722 | DoNotUseBareExcept | Do not use bare `except` |  |
+| E731 | DoNotAssignLambda | Do not assign a lambda expression, use a def |  |
+| E741 | AmbiguousVariableName | Ambiguous variable name: `...` |  |
+| E742 | AmbiguousClassName | Ambiguous class name: `...` |  |
+| E743 | AmbiguousFunctionName | Ambiguous function name: `...` |  |
+| E902 | IOError | IOError: `...` |  |
+| E999 | SyntaxError | SyntaxError: `...` |  |
+| W292 | NoNewLineAtEndOfFile | No newline at end of file |  |
+
+### pydocstyle
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| D100 | PublicModule | Missing docstring in public module |  |
+| D101 | PublicClass | Missing docstring in public class |  |
+| D102 | PublicMethod | Missing docstring in public method |  |
+| D103 | PublicFunction | Missing docstring in public function |  |
+| D104 | PublicPackage | Missing docstring in public package |  |
+| D105 | MagicMethod | Missing docstring in magic method |  |
+| D106 | PublicNestedClass | Missing docstring in public nested class |  |
+| D107 | PublicInit | Missing docstring in `__init__` |  |
+| D200 | FitsOnOneLine | One-line docstring should fit on one line |  |
+| D201 | NoBlankLineBeforeFunction | No blank lines allowed before function docstring (found 1) | 🛠 |
+| D202 | NoBlankLineAfterFunction | No blank lines allowed after function docstring (found 1) | 🛠 |
+| D203 | OneBlankLineBeforeClass | 1 blank line required before class docstring | 🛠 |
+| D204 | OneBlankLineAfterClass | 1 blank line required after class docstring | 🛠 |
+| D205 | BlankLineAfterSummary | 1 blank line required between summary line and description | 🛠 |
+| D206 | IndentWithSpaces | Docstring should be indented with spaces, not tabs |  |
+| D207 | NoUnderIndentation | Docstring is under-indented | 🛠 |
+| D208 | NoOverIndentation | Docstring is over-indented | 🛠 |
+| D209 | NewLineAfterLastParagraph | Multi-line docstring closing quotes should be on a separate line | 🛠 |
+| D210 | NoSurroundingWhitespace | No whitespaces allowed surrounding docstring text | 🛠 |
+| D211 | NoBlankLineBeforeClass | No blank lines allowed before class docstring | 🛠 |
+| D212 | MultiLineSummaryFirstLine | Multi-line docstring summary should start at the first line |  |
+| D213 | MultiLineSummarySecondLine | Multi-line docstring summary should start at the second line |  |
+| D214 | SectionNotOverIndented | Section is over-indented ("Returns") | 🛠 |
+| D215 | SectionUnderlineNotOverIndented | Section underline is over-indented ("Returns") | 🛠 |
+| D300 | UsesTripleQuotes | Use """triple double quotes""" |  |
+| D400 | EndsInPeriod | First line should end with a period |  |
+| D402 | NoSignature | First line should not be the function's signature |  |
+| D403 | FirstLineCapitalized | First word of the first line should be properly capitalized |  |
+| D404 | NoThisPrefix | First word of the docstring should not be `This` |  |
+| D405 | CapitalizeSectionName | Section name should be properly capitalized ("returns") | 🛠 |
+| D406 | NewLineAfterSectionName | Section name should end with a newline ("Returns") | 🛠 |
+| D407 | DashedUnderlineAfterSection | Missing dashed underline after section ("Returns") | 🛠 |
+| D408 | SectionUnderlineAfterName | Section underline should be in the line following the section's name ("Returns") | 🛠 |
+| D409 | SectionUnderlineMatchesSectionLength | Section underline should match the length of its name ("Returns") | 🛠 |
+| D410 | BlankLineAfterSection | Missing blank line after section ("Returns") | 🛠 |
+| D411 | BlankLineBeforeSection | Missing blank line before section ("Returns") | 🛠 |
+| D412 | NoBlankLinesBetweenHeaderAndContent | No blank lines allowed between a section header and its content ("Returns") | 🛠 |
+| D413 | BlankLineAfterLastSection | Missing blank line after last section ("Returns") | 🛠 |
+| D414 | NonEmptySection | Section has no content ("Returns") |  |
+| D415 | EndsInPunctuation | First line should end with a period, question mark, or exclamation point |  |
+| D416 | SectionNameEndsInColon | Section name should end with a colon ("Returns") | 🛠 |
+| D417 | DocumentAllArguments | Missing argument descriptions in the docstring: `x`, `y` |  |
+| D418 | SkipDocstring | Function decorated with @overload shouldn't contain a docstring |  |
+| D419 | NonEmpty | Docstring is empty |  |
+
+### pyupgrade
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| U001 | UselessMetaclassType | `__metaclass__ = type` is implied | 🛠 |
+| U002 | UnnecessaryAbspath | `abspath(__file__)` is unnecessary in Python 3.9 and later | 🛠 |
+| U003 | TypeOfPrimitive | Use `str` instead of `type(...)` | 🛠 |
+| U004 | UselessObjectInheritance | Class `...` inherits from object | 🛠 |
+| U005 | DeprecatedUnittestAlias | `assertEquals` is deprecated, use `assertEqual` instead | 🛠 |
+| U006 | UsePEP585Annotation | Use `list` instead of `List` for type annotations | 🛠 |
+| U007 | UsePEP604Annotation | Use `X \| Y` for type annotations | 🛠 |
+| U008 | SuperCallWithParameters | Use `super()` instead of `super(__class__, self)` | 🛠 |
+
+### pep8-naming
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| N801 | InvalidClassName | Class name `...` should use CapWords convention  |  |
+| N802 | InvalidFunctionName | Function name `...` should be lowercase |  |
+| N803 | InvalidArgumentName | Argument name `...` should be lowercase |  |
+| N804 | InvalidFirstArgumentNameForClassMethod | First argument of a class method should be named `cls` |  |
+| N805 | InvalidFirstArgumentNameForMethod | First argument of a method should be named `self` |  |
+| N807 | DunderFunctionName | Function name should not start and end with `__` |  |
+| N811 | ConstantImportedAsNonConstant | Constant `...` imported as non-constant `...` |  |
+| N812 | LowercaseImportedAsNonLowercase | Lowercase `...` imported as non-lowercase `...` |  |
+| N813 | CamelcaseImportedAsLowercase | Camelcase `...` imported as lowercase `...` |  |
+| N814 | CamelcaseImportedAsConstant | Camelcase `...` imported as constant `...` |  |
+| N817 | CamelcaseImportedAsAcronym | Camelcase `...` imported as acronym `...` |  |
+
+### flake8-comprehensions
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| C400 | UnnecessaryGeneratorList | Unnecessary generator (rewrite as a `list` comprehension) |  |
+| C401 | UnnecessaryGeneratorSet | Unnecessary generator (rewrite as a `set` comprehension) |  |
+| C402 | UnnecessaryGeneratorDict | Unnecessary generator (rewrite as a `dict` comprehension) |  |
+| C403 | UnnecessaryListComprehensionSet | Unnecessary `list` comprehension (rewrite as a `set` comprehension) |  |
+| C404 | UnnecessaryListComprehensionDict | Unnecessary `list` comprehension (rewrite as a `dict` comprehension) |  |
+| C405 | UnnecessaryLiteralSet | Unnecessary `(list\|tuple)` literal (rewrite as a `set` literal) |  |
+| C406 | UnnecessaryLiteralDict | Unnecessary `(list\|tuple)` literal (rewrite as a `dict` literal) |  |
+| C408 | UnnecessaryCollectionCall | Unnecessary `(dict\|list\|tuple)` call (rewrite as a literal) |  |
+| C409 | UnnecessaryLiteralWithinTupleCall | Unnecessary `(list\|tuple)` literal passed to `tuple()` (remove the outer call to `tuple()`) |  |
+| C410 | UnnecessaryLiteralWithinListCall | Unnecessary `(list\|tuple)` literal passed to `list()` (rewrite as a `list` literal) |  |
+| C411 | UnnecessaryListCall | Unnecessary `list` call (remove the outer call to `list()`) |  |
+| C413 | UnnecessaryCallAroundSorted | Unnecessary `(list\|reversed)` call around `sorted()` |  |
+| C414 | UnnecessaryDoubleCastOrProcess | Unnecessary `(list\|reversed\|set\|sorted\|tuple)` call within `(list\|set\|sorted\|tuple)()` |  |
+| C415 | UnnecessarySubscriptReversal | Unnecessary subscript reversal of iterable within `(reversed\|set\|sorted)()` |  |
+| C416 | UnnecessaryComprehension |  Unnecessary `(list\|set)` comprehension (rewrite using `(list\|set)()`) |  |
+| C417 | UnnecessaryMap | Unnecessary `map` usage (rewrite using a `(list\|set\|dict)` comprehension) |  |
+
+### flake8-bugbear
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| B002 | UnaryPrefixIncrement | Python does not support the unary prefix increment. |  |
+| B011 | DoNotAssertFalse | Do not `assert False` (`python -O` removes these calls), raise `AssertionError()` | 🛠 |
+| B014 | DuplicateHandlerException | Exception handler with duplicate exception: `ValueError` | 🛠 |
+| B017 | NoAssertRaisesException | `assertRaises(Exception):` should be considered evil. |  |
+| B025 | DuplicateTryBlockException | try-except block with duplicate exception `Exception` |  |
+
+### flake8-builtins
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| A001 | BuiltinVariableShadowing | Variable `...` is shadowing a python builtin |  |
+| A002 | BuiltinArgumentShadowing | Argument `...` is shadowing a python builtin |  |
+| A003 | BuiltinAttributeShadowing | Class attribute `...` is shadowing a python builtin |  |
+
+### flake8-print
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| T201 | PrintFound | `print` found | 🛠 |
+| T203 | PPrintFound | `pprint` found | 🛠 |
+
+### Meta rules
+
+| Code | Name | Message | Fix |
+| ---- | ---- | ------- | --- |
+| M001 | UnusedNOQA | Unused `noqa` directive | 🛠 |
+
+## Editor Integrations

 ### PyCharm

-ruff can be installed as an [External Tool](https://www.jetbrains.com/help/pycharm/configuring-third-party-tools.html)
+Ruff can be installed as an [External Tool](https://www.jetbrains.com/help/pycharm/configuring-third-party-tools.html)
 in PyCharm. Open the Preferences pane, then navigate to "Tools", then "External Tools". From there,
 add a new tool with the following configuration:

-![Install ruff as an External Tool](https://user-images.githubusercontent.com/1309177/193155720-336e43f0-1a8d-46b4-bc12-e60f9ae01f7e.png)
+![Install Ruff as an External Tool](https://user-images.githubusercontent.com/1309177/193155720-336e43f0-1a8d-46b4-bc12-e60f9ae01f7e.png)

-ruff should then appear as a runnable action:
+Ruff should then appear as a runnable action:

-![ruff as a runnable action](https://user-images.githubusercontent.com/1309177/193156026-732b0aaf-3dd9-4549-9b4d-2de6d2168a33.png)
+![Ruff as a runnable action](https://user-images.githubusercontent.com/1309177/193156026-732b0aaf-3dd9-4549-9b4d-2de6d2168a33.png)

 ### GitHub Actions

-GitHub Actions has everything you need to run ruff out-of-the-box:
+GitHub Actions has everything you need to run Ruff out-of-the-box:

 ```yaml
 name: CI
@@ -366,13 +441,175 @@ jobs:
        run: |
          python -m pip install --upgrade pip
          pip install ruff
-      - name: Run ruff
+      - name: Run Ruff
        run: ruff .
 ```

+## FAQ
+
+### Is Ruff compatible with Black?
+
+Yes. Ruff is compatible with [Black](https://github.com/psf/black) 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
+stylistic lint rules that are obviated by autoformatting.
+
+### How does Ruff compare to Flake8?
+
+Ruff can be used as a (near) drop-in replacement for Flake8 when used (1) without or with a small
+number of plugins, (2) alongside Black, and (3) on Python 3 code.
+
+Under those conditions Ruff is missing 14 rules related to string `.format` calls, 1 rule related
+to docstring parsing, and 1 rule related to redefined variables.
+
+Ruff re-implements some of the most popular Flake8 plugins and related code quality tools natively,
+including:
+
+- [`pydocstyle`](https://pypi.org/project/pydocstyle/)
+- [`yesqa`](https://github.com/asottile/yesqa)
+- [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
+- [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
+- [`flake8-super`](https://pypi.org/project/flake8-super/)
+- [`flake8-print`](https://pypi.org/project/flake8-print/)
+- [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
+- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (6/32)
+- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34)
+- [`autoflake`](https://pypi.org/project/autoflake/) (1/7)
+
+Beyond rule-set parity, Ruff suffers from the following limitations vis-à-vis Flake8:
+
+1. Ruff does not yet support a few Python 3.9 and 3.10 language features, including structural
+   pattern matching and parenthesized context managers.
+2. Flake8 has a plugin architecture and supports writing custom lint rules. (To date, popular Flake8
+   plugins have been re-implemented within Ruff directly.)
+
+### Which tools does Ruff replace?
+
+Today, Ruff can be used to replace Flake8 when used with any of the following plugins:
+
+- [`flake8-docstrings`](https://pypi.org/project/flake8-docstrings/)
+- [`flake8-builtins`](https://pypi.org/project/flake8-builtins/)
+- [`flake8-super`](https://pypi.org/project/flake8-super/)
+- [`flake8-print`](https://pypi.org/project/flake8-print/)
+- [`flake8-comprehensions`](https://pypi.org/project/flake8-comprehensions/)
+- [`flake8-bugbear`](https://pypi.org/project/flake8-bugbear/) (6/32)
+
+Ruff also implements the functionality that you get from [`yesqa`](https://github.com/asottile/yesqa),
+and a subset of the rules implemented in [`pyupgrade`](https://pypi.org/project/pyupgrade/) (8/34).
+
+If you're looking to use Ruff, but rely on an unsupported Flake8 plugin, free to file an Issue.
+
+### Do I need to install Rust to use Ruff?
+
+Nope! Ruff is available as [`ruff`](https://pypi.org/project/ruff/) on PyPI:
+
+```shell
+pip install ruff
+```
+
+Ruff ships with wheels for all major platforms, which enables `pip` to install Ruff without relying
+on Rust at all.
+
+### Can I write my own plugins for Ruff?
+
+Ruff does not yet support third-party plugins, though a plugin system is within-scope for the
+project. See [#283](https://github.com/charliermarsh/ruff/issues/283) for more.
+
+### Does Ruff support NumPy- or Google-style docstrings?
+
+Yes! To enable a specific docstring convention, start by enabling all `pydocstyle` error codes, and
+then selectively disabling based on your [preferred convention](https://www.pydocstyle.org/en/latest/error_codes.html#default-conventions).
+
+For example, if you're coming from `flake8-docstrings`, the following configuration is equivalent to
+`--docstring-convention numpy`:
+
+```toml
+[tool.ruff]
+extend-select = [
+    "D100",
+    "D101",
+    "D102",
+    "D103",
+    "D104",
+    "D105",
+    "D106",
+    "D200",
+    "D201",
+    "D202",
+    "D204",
+    "D205",
+    "D206",
+    "D207",
+    "D208",
+    "D209",
+    "D210",
+    "D211",
+    "D214",
+    "D215",
+    "D300",
+    "D400",
+    "D402",
+    "D403",
+    "D404",
+    "D405",
+    "D406",
+    "D407",
+    "D408",
+    "D409",
+    "D410",
+    "D411",
+    "D412",
+    "D413",
+    "D418",
+    "D419",
+]
+```
+
+Similarly, the following is equivalent to `--docstring-convention google`:
+
+```toml
+[tool.ruff]
+extend-select = [
+    "D100",
+    "D101",
+    "D102",
+    "D103",
+    "D104",
+    "D105",
+    "D106",
+    "D107",
+    "D200",
+    "D201",
+    "D202",
+    "D205",
+    "D206",
+    "D207",
+    "D208",
+    "D209",
+    "D210",
+    "D211",
+    "D212",
+    "D214",
+    "D300",
+    "D402",
+    "D403",
+    "D405",
+    "D410",
+    "D411",
+    "D412",
+    "D414",
+    "D415",
+    "D416",
+    "D417",
+    "D418",
+    "D419",
+]
+```
+
 ## Development

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

 Assuming you have `cargo` installed, you can run:
@@ -384,13 +621,13 @@ cargo clippy
 cargo test
 ```

-## Deployment
+## Releases

-ruff is distributed on [PyPI](https://pypi.org/project/ruff/), and published via [`maturin`](https://github.com/PyO3/maturin).
+Ruff is distributed on [PyPI](https://pypi.org/project/ruff/), and published via [`maturin`](https://github.com/PyO3/maturin).

 See: `.github/workflows/release.yaml`.

-## Benchmarking
+## Benchmarks

 First, clone [CPython](https://github.com/python/cpython). It's a large and diverse Python codebase,
 which makes it a good target for benchmarking.
@@ -467,9 +704,9 @@ hyperfine --ignore-failure --warmup 5 \

 In order, these evaluate:

- ruff
+- Ruff
 - Pylint
- PyFlakes
+- Pyflakes
 - autoflake
 - pycodestyle
 - Flake8
--- a/examples/generate_rules_table.rs
+++ b/examples/generate_rules_table.rs
@@ -1,26 +1,29 @@
-/// Generate a Markdown-compatible table of supported lint rules.
+//! Generate a Markdown-compatible table of supported lint rules.
+
 use strum::IntoEnumIterator;

-use ruff::checks::{CheckCode, DEFAULT_CHECK_CODES};
+use ruff::checks::{CheckCategory, CheckCode};

 fn main() {
-    println!("| Code | Name | Message |     |     |");
-    println!("| ---- | ---- | ------- | --- | --- |");
-    for check_code in CheckCode::iter() {
-        let check_kind = check_code.kind();
-        let default_token = if DEFAULT_CHECK_CODES.contains(&check_code) {
-            "✅"
-        } else {
-            ""
-        };
-        let fix_token = if check_kind.fixable() { "🛠" } else { "" };
-        println!(
-            "| {} | {} | {} | {} | {} |",
-            check_kind.code().as_ref(),
-            check_kind.as_ref(),
-            check_kind.body().replace("|", r"\|"),
-            default_token,
-            fix_token
-        );
+    for check_category in CheckCategory::iter() {
+        println!("### {}", check_category.title());
+        println!();
+
+        println!("| Code | Name | Message | Fix |");
+        println!("| ---- | ---- | ------- | --- |");
+        for check_code in CheckCode::iter() {
+            if check_code.category() == check_category {
+                let check_kind = check_code.kind();
+                let fix_token = if check_kind.fixable() { "🛠" } else { "" };
+                println!(
+                    "| {} | {} | {} | {} |",
+                    check_kind.code().as_ref(),
+                    check_kind.as_ref(),
+                    check_kind.summary().replace("|", r"\|"),
+                    fix_token
+                );
+            }
+        }
+        println!();
    }
 }
--- a/examples/print_ast.rs
+++ b/examples/print_ast.rs
@@ -1,4 +1,5 @@
-/// Print the AST for a given Python file.
+//! Print the AST for a given Python file.
+
 use std::path::PathBuf;

 use anyhow::Result;
--- a/examples/print_tokens.rs
+++ b/examples/print_tokens.rs
@@ -1,4 +1,5 @@
-/// Print the token stream for a given Python file.
+//! Print the token stream for a given Python file.
+
 use std::path::PathBuf;

 use anyhow::Result;
--- a/resources/test/fixtures/B002.py
+++ b/resources/test/fixtures/B002.py
@@ -0,0 +1,20 @@
+"""
+Should emit:
+B002 - on lines 15 and 20
+"""
+
+
+def this_is_all_fine(n):
+    x = n + 1
+    y = 1 + n
+    z = +x + y
+    return +z
+
+
+def this_is_buggy(n):
+    x = ++n
+    return x
+
+
+def this_is_buggy_too(n):
+    return ++n
--- a/resources/test/fixtures/B017.py
+++ b/resources/test/fixtures/B017.py
@@ -0,0 +1,36 @@
+"""
+Should emit:
+B017 - on lines 20
+"""
+import asyncio
+import unittest
+
+CONSTANT = True
+
+
+def something_else() -> None:
+    for i in (1, 2, 3):
+        print(i)
+
+
+class Foo:
+    pass
+
+
+class Foobar(unittest.TestCase):
+    def evil_raises(self) -> None:
+        with self.assertRaises(Exception):
+            raise Exception("Evil I say!")
+
+    def context_manager_raises(self) -> None:
+        with self.assertRaises(Exception) as ex:
+            raise Exception("Context manager is good")
+        self.assertEqual("Context manager is good", str(ex.exception))
+
+    def regex_raises(self) -> None:
+        with self.assertRaisesRegex(Exception, "Regex is good"):
+            raise Exception("Regex is good")
+
+    def raises_with_absolute_reference(self):
+        with self.assertRaises(asyncio.CancelledError):
+            Foo()
--- a/resources/test/fixtures/C411.py
+++ b/resources/test/fixtures/C411.py
@@ -0,0 +1,2 @@
+x = [1, 2, 3]
+list([i for i in x])
--- a/resources/test/fixtures/C413.py
+++ b/resources/test/fixtures/C413.py
@@ -0,0 +1,4 @@
+x = [2, 3, 1]
+list(sorted(x))
+reversed(sorted(x))
+reversed(sorted(x, reverse=True))
--- a/resources/test/fixtures/C416.py
+++ b/resources/test/fixtures/C416.py
@@ -0,0 +1,6 @@
+x = [1, 2, 3]
+[i for i in x]
+{i for i in x}
+
+[i for i in x if i > 1]
+[i for i in x for j in x]
--- a/resources/test/fixtures/C417.py
+++ b/resources/test/fixtures/C417.py
@@ -0,0 +1,6 @@
+nums = [1, 2, 3]
+map(lambda x: x + 1, nums)
+map(lambda x: str(x), nums)
+list(map(lambda x: x * 2, nums))
+set(map(lambda x: x % 2 == 0, nums))
+dict(map(lambda v: (v, v**2), nums))
--- a/resources/test/fixtures/F401_0.py
+++ b/resources/test/fixtures/F401_0.py
@@ -61,7 +61,7 @@ Y = TypeVar("Y", bound="Dict")
 Z = TypeVar("Z", "List", "Set")

 a = list["Fruit"]
-b = Union["Nut", None]
+b = Union["""Nut""", None]
 c = cast("Vegetable", b)

 Field = lambda default=MISSING: field(default=default)
--- a/resources/test/fixtures/N801.py
+++ b/resources/test/fixtures/N801.py
@@ -0,0 +1,34 @@
+class bad:
+    pass
+
+
+class _bad:
+    pass
+
+
+class bad_class:
+    pass
+
+
+class Bad_Class:
+    pass
+
+
+class BAD_CLASS:
+    pass
+
+
+class Good:
+    pass
+
+
+class _Good:
+    pass
+
+
+class GoodClass:
+    pass
+
+
+class GOOD:
+    pass
--- a/resources/test/fixtures/N802.py
+++ b/resources/test/fixtures/N802.py
@@ -0,0 +1,26 @@
+def Bad():
+    pass
+
+
+def _Bad():
+    pass
+
+
+def BAD():
+    pass
+
+
+def BAD_FUNC():
+    pass
+
+
+def good():
+    pass
+
+
+def _good():
+    pass
+
+
+def good_func():
+    pass
--- a/resources/test/fixtures/N803.py
+++ b/resources/test/fixtures/N803.py
@@ -0,0 +1,7 @@
+def func(a, A):
+    return a, A
+
+
+class Class:
+    def method(self, a, A):
+        return a, A
--- a/resources/test/fixtures/N804.py
+++ b/resources/test/fixtures/N804.py
@@ -0,0 +1,19 @@
+class Class:
+    @classmethod
+    def bad_class_method(this):
+        pass
+
+    @classmethod
+    def good_class_method(cls):
+        pass
+
+    def method(self):
+        pass
+
+    @staticmethod
+    def static_method(x):
+        return x
+
+
+def func(x):
+    return x
--- a/resources/test/fixtures/N805.py
+++ b/resources/test/fixtures/N805.py
@@ -0,0 +1,26 @@
+import random
+
+
+class Class:
+    def bad_method(this):
+        pass
+
+    if random.random(0, 2) == 0:
+
+        def extra_bad_method(this):
+            pass
+
+    def good_method(self):
+        pass
+
+    @classmethod
+    def class_method(cls):
+        pass
+
+    @staticmethod
+    def static_method(x):
+        return x
+
+
+def func(x):
+    return x
--- a/resources/test/fixtures/N807.py
+++ b/resources/test/fixtures/N807.py
@@ -0,0 +1,15 @@
+def __bad__():
+    pass
+
+
+def __good():
+    pass
+
+
+def good__():
+    pass
+
+
+class Class:
+    def __good__(self):
+        pass
--- a/resources/test/fixtures/N811.py
+++ b/resources/test/fixtures/N811.py
@@ -0,0 +1,3 @@
+import mod.CONST as const
+from mod import CONSTANT as constant
+from mod import ANOTHER_CONSTANT as another_constant
--- a/resources/test/fixtures/N812.py
+++ b/resources/test/fixtures/N812.py
@@ -0,0 +1,3 @@
+import modl.lowercase as Lower
+from mod import lowercase as Lowercase
+from mod import another_lowercase as AnotherLowercase
--- a/resources/test/fixtures/N813.py
+++ b/resources/test/fixtures/N813.py
@@ -0,0 +1,3 @@
+import mod.Camel as camel
+from mod import CamelCase as camelcase
+from mod import AnotherCamelCase as another_camelcase
--- a/resources/test/fixtures/N814.py
+++ b/resources/test/fixtures/N814.py
@@ -0,0 +1,3 @@
+import mod.Camel as CAMEL
+from mod import CamelCase as CAMELCASE
+from mod import AnotherCamelCase as ANOTHER_CAMELCASE
--- a/resources/test/fixtures/N817.py
+++ b/resources/test/fixtures/N817.py
@@ -0,0 +1,2 @@
+import mod.CaMel as CM
+from mod import CamelCase as CC
--- a/resources/test/fixtures/canonical_google_examples.py
+++ b/resources/test/fixtures/canonical_google_examples.py
@@ -0,0 +1,108 @@
+"""A one line summary of the module or program, terminated by a period.
+
+Leave one blank line.  The rest of this docstring should contain an
+overall description of the module or program.  Optionally, it may also
+contain a brief description of exported classes and functions and/or usage
+examples.
+
+  Typical usage example:
+
+  foo = ClassFoo()
+  bar = foo.FunctionBar()
+"""
+# above: "2.8.2 Modules" section example
+# https://google.github.io/styleguide/pyguide.html#382-modules
+
+# Examples from the official "Google Python Style Guide" documentation:
+#     * As HTML: https://google.github.io/styleguide/pyguide.html
+#     * Source Markdown:
+#         https://github.com/google/styleguide/blob/gh-pages/pyguide.md
+
+import os
+from .expected import Expectation
+
+expectation = Expectation()
+expect = expectation.expect
+
+# module docstring expected violations:
+expectation.expected.add((
+    os.path.normcase(__file__),
+    "D213: Multi-line docstring summary should start at the second line"))
+
+
+# "3.8.3 Functions and Methods" section example
+# https://google.github.io/styleguide/pyguide.html#383-functions-and-methods
+@expect("D213: Multi-line docstring summary should start at the second line",
+        arg_count=3)
+@expect("D401: First line should be in imperative mood "
+        "(perhaps 'Fetch', not 'Fetches')", arg_count=3)
+@expect("D406: Section name should end with a newline "
+        "('Raises', not 'Raises:')", arg_count=3)
+@expect("D406: Section name should end with a newline "
+        "('Returns', not 'Returns:')", arg_count=3)
+@expect("D407: Missing dashed underline after section ('Raises')", arg_count=3)
+@expect("D407: Missing dashed underline after section ('Returns')",
+        arg_count=3)
+@expect("D413: Missing blank line after last section ('Raises')", arg_count=3)
+def fetch_bigtable_rows(big_table, keys, other_silly_variable=None):
+    """Fetches rows from a Bigtable.
+
+    Retrieves rows pertaining to the given keys from the Table instance
+    represented by big_table.  Silly things may happen if
+    other_silly_variable is not None.
+
+    Args:
+        big_table: An open Bigtable Table instance.
+        keys: A sequence of strings representing the key of each table row
+            to fetch.
+        other_silly_variable: Another optional variable, that has a much
+            longer name than the other args, and which does nothing.
+
+    Returns:
+        A dict mapping keys to the corresponding table row data
+        fetched. Each row is represented as a tuple of strings. For
+        example:
+
+        {'Serak': ('Rigel VII', 'Preparer'),
+         'Zim': ('Irk', 'Invader'),
+         'Lrrr': ('Omicron Persei 8', 'Emperor')}
+
+        If a key from the keys argument is missing from the dictionary,
+        then that row was not found in the table.
+
+    Raises:
+        IOError: An error occurred accessing the bigtable.Table object.
+    """
+
+
+# "3.8.4 Classes" section example
+# https://google.github.io/styleguide/pyguide.html#384-classes
+@expect("D203: 1 blank line required before class docstring (found 0)")
+@expect("D213: Multi-line docstring summary should start at the second line")
+@expect("D406: Section name should end with a newline "
+        "('Attributes', not 'Attributes:')")
+@expect("D407: Missing dashed underline after section ('Attributes')")
+@expect("D413: Missing blank line after last section ('Attributes')")
+class SampleClass:
+    """Summary of class here.
+
+    Longer class information....
+    Longer class information....
+
+    Attributes:
+        likes_spam: A boolean indicating if we like SPAM or not.
+        eggs: An integer count of the eggs we have laid.
+    """
+
+    @expect("D401: First line should be in imperative mood "
+            "(perhaps 'Init', not 'Inits')", arg_count=2)
+    def __init__(self, likes_spam=False):
+        """Inits SampleClass with blah."""
+        if self:  # added to avoid NameError when run via @expect decorator
+            self.likes_spam = likes_spam
+            self.eggs = 0
+
+    @expect("D401: First line should be in imperative mood "
+            "(perhaps 'Perform', not 'Performs')", arg_count=1)
+    def public_method(self):
+        """Performs operation blah."""
--- a/resources/test/fixtures/canonical_numpy_examples.py
+++ b/resources/test/fixtures/canonical_numpy_examples.py
@@ -0,0 +1,163 @@
+"""This is the docstring for the example.py module.  Modules names should
+have short, all-lowercase names.  The module name may have underscores if
+this improves readability.
+
+Every module should have a docstring at the very top of the file.  The
+module's docstring may extend over multiple lines.  If your docstring does
+extend over multiple lines, the closing three quotation marks must be on
+a line by itself, preferably preceded by a blank line.
+
+"""
+
+# Example source file from the official "numpydoc docstring guide"
+# documentation (with the modification of commenting out all the original
+# ``import`` lines, plus adding this note and ``Expectation`` code):
+#     * As HTML: https://numpydoc.readthedocs.io/en/latest/example.html
+#     * Source Python:
+#         https://github.com/numpy/numpydoc/blob/master/doc/example.py
+
+# from __future__ import division, absolute_import, print_function
+#
+# import os  # standard library imports first
+#
+# Do NOT import using *, e.g. from numpy import *
+#
+# Import the module using
+#
+#   import numpy
+#
+# instead or import individual functions as needed, e.g
+#
+#  from numpy import array, zeros
+#
+# If you prefer the use of abbreviated module names, we suggest the
+# convention used by NumPy itself::
+#
+# import numpy as np
+# import matplotlib as mpl
+# import matplotlib.pyplot as plt
+#
+# These abbreviated names are not to be used in docstrings; users must
+# be able to paste and execute docstrings after importing only the
+# numpy module itself, unabbreviated.
+
+import os
+from .expected import Expectation
+
+expectation = Expectation()
+expect = expectation.expect
+
+# module docstring expected violations:
+expectation.expected.add((
+    os.path.normcase(__file__),
+    "D205: 1 blank line required between summary line and description "
+    "(found 0)"))
+expectation.expected.add((
+    os.path.normcase(__file__),
+    "D213: Multi-line docstring summary should start at the second line"))
+expectation.expected.add((
+    os.path.normcase(__file__),
+    "D400: First line should end with a period (not 'd')"))
+expectation.expected.add((
+    os.path.normcase(__file__),
+    "D404: First word of the docstring should not be `This`"))
+expectation.expected.add((
+    os.path.normcase(__file__),
+    "D415: First line should end with a period, question mark, or exclamation "
+    "point (not 'd')"))
+
+
+@expect("D213: Multi-line docstring summary should start at the second line",
+        arg_count=3)
+@expect("D401: First line should be in imperative mood; try rephrasing "
+        "(found 'A')", arg_count=3)
+@expect("D413: Missing blank line after last section ('Examples')",
+        arg_count=3)
+def foo(var1, var2, long_var_name='hi'):
+    r"""A one-line summary that does not use variable names.
+
+    Several sentences providing an extended description. Refer to
+    variables using back-ticks, e.g. `var`.
+
+    Parameters
+    ----------
+    var1 : array_like
+        Array_like means all those objects -- lists, nested lists, etc. --
+        that can be converted to an array.  We can also refer to
+        variables like `var1`.
+    var2 : int
+        The type above can either refer to an actual Python type
+        (e.g. ``int``), or describe the type of the variable in more
+        detail, e.g. ``(N,) ndarray`` or ``array_like``.
+    long_var_name : {'hi', 'ho'}, optional
+        Choices in brackets, default first when optional.
+
+    Returns
+    -------
+    type
+        Explanation of anonymous return value of type ``type``.
+    describe : type
+        Explanation of return value named `describe`.
+    out : type
+        Explanation of `out`.
+    type_without_description
+
+    Other Parameters
+    ----------------
+    only_seldom_used_keywords : type
+        Explanation
+    common_parameters_listed_above : type
+        Explanation
+
+    Raises
+    ------
+    BadException
+        Because you shouldn't have done that.
+
+    See Also
+    --------
+    numpy.array : Relationship (optional).
+    numpy.ndarray : Relationship (optional), which could be fairly long, in
+                    which case the line wraps here.
+    numpy.dot, numpy.linalg.norm, numpy.eye
+
+    Notes
+    -----
+    Notes about the implementation algorithm (if needed).
+
+    This can have multiple paragraphs.
+
+    You may include some math:
+
+    .. math:: X(e^{j\omega } ) = x(n)e^{ - j\omega n}
+
+    And even use a Greek symbol like :math:`\omega` inline.
+
+    References
+    ----------
+    Cite the relevant literature, e.g. [1]_.  You may also cite these
+    references in the notes section above.
+
+    .. [1] O. McNoleg, "The integration of GIS, remote sensing,
+       expert systems and adaptive co-kriging for environmental habitat
+       modelling of the Highland Haggis using object-oriented, fuzzy-logic
+       and neural-network techniques," Computers & Geosciences, vol. 22,
+       pp. 585-588, 1996.
+
+    Examples
+    --------
+    These are written in doctest format, and should illustrate how to
+    use the function.
+
+    >>> a = [1, 2, 3]
+    >>> print([x + 3 for x in a])
+    [4, 5, 6]
+    >>> print("a\nb")
+    a
+    b
+    """
+    # After closing class docstring, there should be one blank line to
+    # separate following codes (according to PEP257).
+    # But for function, method and module, there should be no blank lines
+    # after closing the docstring.
+    pass
--- a/resources/test/fixtures/sections.py
+++ b/resources/test/fixtures/sections.py
@@ -0,0 +1,497 @@
+"""A valid module docstring."""
+
+from .expected import Expectation
+
+expectation = Expectation()
+expect = expectation.expect
+
+
+_D213 = 'D213: Multi-line docstring summary should start at the second line'
+_D400 = "D400: First line should end with a period (not '!')"
+
+
+@expect(_D213)
+@expect("D405: Section name should be properly capitalized "
+        "('Returns', not 'returns')")
+def not_capitalized():  # noqa: D416
+    """Toggle the gizmo.
+
+    returns
+    -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D406: Section name should end with a newline "
+        "('Returns', not 'Returns:')")
+def superfluous_suffix():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns:
+    -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D407: Missing dashed underline after section ('Returns')")
+def no_underline():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D407: Missing dashed underline after section ('Returns')")
+@expect("D414: Section has no content ('Returns')")
+def no_underline_and_no_description():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+
+    """
+
+
+@expect(_D213)
+@expect("D410: Missing blank line after section ('Returns')")
+@expect("D414: Section has no content ('Returns')")
+@expect("D411: Missing blank line before section ('Yields')")
+@expect("D414: Section has no content ('Yields')")
+def consecutive_sections():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+    -------
+    Yields
+    ------
+
+    Raises
+    ------
+    Questions.
+
+    """
+
+
+@expect(_D213)
+@expect("D408: Section underline should be in the line following the "
+        "section's name ('Returns')")
+def blank_line_before_underline():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+
+    -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D409: Section underline should match the length of its name "
+        "(Expected 7 dashes in section 'Returns', got 2)")
+def bad_underline_length():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+    --
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D413: Missing blank line after last section ('Returns')")
+def no_blank_line_after_last_section():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+    -------
+    A value of some sort.
+    """
+
+
+@expect(_D213)
+@expect("D411: Missing blank line before section ('Returns')")
+def no_blank_line_before_section():  # noqa: D416
+    """Toggle the gizmo.
+
+    The function's description.
+    Returns
+    -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D214: Section is over-indented ('Returns')")
+def section_overindented():  # noqa: D416
+    """Toggle the gizmo.
+
+        Returns
+    -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D215: Section underline is over-indented (in section 'Returns')")
+def section_underline_overindented():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+        -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D215: Section underline is over-indented (in section 'Returns')")
+@expect("D413: Missing blank line after last section ('Returns')")
+@expect("D414: Section has no content ('Returns')")
+def section_underline_overindented_and_contentless():  # noqa: D416
+    """Toggle the gizmo.
+
+    Returns
+        -------
+    """
+
+
+@expect(_D213)
+def ignore_non_actual_section():  # noqa: D416
+    """Toggle the gizmo.
+
+    This is the function's description, which will also specify what it
+    returns
+
+    """
+
+
+@expect(_D213)
+@expect("D401: First line should be in imperative mood "
+        "(perhaps 'Return', not 'Returns')")
+@expect("D400: First line should end with a period (not 's')")
+@expect("D415: First line should end with a period, question "
+        "mark, or exclamation point (not 's')")
+@expect("D205: 1 blank line required between summary line and description "
+        "(found 0)")
+def section_name_in_first_line():  # noqa: D416
+    """Returns
+    -------
+    A value of some sort.
+
+    """
+
+
+@expect(_D213)
+@expect("D405: Section name should be properly capitalized "
+        "('Short Summary', not 'Short summary')")
+@expect("D412: No blank lines allowed between a section header and its "
+        "content ('Short Summary')")
+@expect("D409: Section underline should match the length of its name "
+        "(Expected 7 dashes in section 'Returns', got 6)")
+@expect("D410: Missing blank line after section ('Returns')")
+@expect("D411: Missing blank line before section ('Raises')")
+@expect("D406: Section name should end with a newline "
+        "('Raises', not 'Raises:')")
+@expect("D407: Missing dashed underline after section ('Raises')")
+def multiple_sections():  # noqa: D416
+    """Toggle the gizmo.
+
+    Short summary
+    -------------
+
+    This is the function's description, which will also specify what it
+    returns.
+
+    Returns
+    ------
+    Many many wonderful things.
+    Raises:
+    My attention.
+
+    """
+
+
+@expect(_D213)
+def false_positive_section_prefix():  # noqa: D416
+    """Toggle the gizmo.
+
+    Parameters
+    ----------
+    attributes_are_fun: attributes for the function.
+
+    """
+
+
+@expect(_D213)
+def section_names_as_parameter_names():  # noqa: D416
+    """Toggle the gizmo.
+
+    Parameters
+    ----------
+    notes : list
+        A list of wonderful notes.
+    examples: list
+        A list of horrible examples.
+
+    """
+
+
+@expect(_D213)
+@expect("D414: Section has no content ('Returns')")
+def valid_google_style_section():  # noqa: D406, D407
+    """Toggle the gizmo.
+
+    Args:
+        note: A random string.
+
+    Returns:
+
+    Raises:
+        RandomError: A random error that occurs randomly.
+
+    """
+
+
+@expect(_D213)
+@expect("D416: Section name should end with a colon "
+        "('Args:', not 'Args')")
+def missing_colon_google_style_section():  # noqa: D406, D407
+    """Toggle the gizmo.
+
+    Args
+        note: A random string.
+
+    """
+
+
+@expect("D417: Missing argument descriptions in the docstring "
+        "(argument(s) y are missing descriptions in "
+        "'bar' docstring)", func_name="bar")
+def _test_nested_functions():
+    x = 1
+
+    def bar(y=2):  # noqa: D207, D213, D406, D407
+        """Nested function test for docstrings.
+
+        Will this work when referencing x?
+
+        Args:
+            x: Test something
+that is broken.
+
+        """
+        print(x)
+
+
+@expect(_D213)
+@expect("D417: Missing argument descriptions in the docstring "
+        "(argument(s) y are missing descriptions in "
+        "'test_missing_google_args' docstring)")
+def test_missing_google_args(x=1, y=2, _private=3):  # noqa: D406, D407
+    """Toggle the gizmo.
+
+    Args:
+        x (int): The greatest integer.
+
+    """
+
+
+class TestGoogle:  # noqa: D203
+    """Test class."""
+
+    def test_method(self, test, another_test, _):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Args:
+            test: A parameter.
+            another_test: Another parameter.
+
+        """
+
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) test, y, z are missing descriptions in "
+            "'test_missing_args' docstring)", arg_count=5)
+    def test_missing_args(self, test, x, y, z=3, _private_arg=3):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Args:
+            x: Another parameter.
+
+        """
+
+    @classmethod
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) test, y, z are missing descriptions in "
+            "'test_missing_args_class_method' docstring)", arg_count=5)
+    def test_missing_args_class_method(cls, test, x, y, _, z=3):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Args:
+            x: Another parameter. The parameter below is missing description.
+            y:
+
+        """
+
+    @staticmethod
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) a, y, z are missing descriptions in "
+            "'test_missing_args_static_method' docstring)", arg_count=4)
+    def test_missing_args_static_method(a, x, y, _test, z=3):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Args:
+            x: Another parameter.
+
+        """
+
+    @staticmethod
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) a, b are missing descriptions in "
+            "'test_missing_docstring' docstring)", arg_count=2)
+    def test_missing_docstring(a, b):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Args:
+            a:
+
+        """
+
+    @staticmethod
+    def test_hanging_indent(skip, verbose):  # noqa: D213, D407
+        """Do stuff.
+
+        Args:
+            skip (:attr:`.Skip`):
+                Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+                Etiam at tellus a tellus faucibus maximus. Curabitur tellus
+                mauris, semper id vehicula ac, feugiat ut tortor.
+            verbose (bool):
+                If True, print out as much infromation as possible.
+                If False, print out concise "one-liner" information.
+
+        """
+
+
+@expect(_D213)
+@expect("D417: Missing argument descriptions in the docstring "
+        "(argument(s) y are missing descriptions in "
+        "'test_missing_numpy_args' docstring)")
+def test_missing_numpy_args(_private_arg=0, x=1, y=2):  # noqa: D406, D407
+    """Toggle the gizmo.
+
+    Parameters
+    ----------
+    x : int
+        The greatest integer in the history \
+of the entire world.
+
+    """
+
+
+class TestNumpy:  # noqa: D203
+    """Test class."""
+
+    def test_method(self, test, another_test, z, _, x=1, y=2, _private_arg=1):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Some long string with a \
+line continuation.
+
+        Parameters
+        ----------
+        test, another_test
+            Some parameters without type.
+        z : some parameter with a very long type description that requires a \
+line continuation.
+            But no further description.
+        x, y : int
+            Some integer parameters.
+
+        """
+
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) test, y, z are missing descriptions in "
+            "'test_missing_args' docstring)", arg_count=5)
+    def test_missing_args(self, test, x, y, z=3, t=1, _private=0):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Parameters
+        ----------
+        x, t : int
+            Some parameters.
+
+
+        """
+
+    @classmethod
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) test, y, z are missing descriptions in "
+            "'test_missing_args_class_method' docstring)", arg_count=4)
+    def test_missing_args_class_method(cls, test, x, y, z=3):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Parameters
+        ----------
+        z
+        x
+            Another parameter. The parameters y, test below are
+            missing descriptions. The parameter z above is also missing
+            a description.
+        y
+        test
+
+        """
+
+    @staticmethod
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) a, z are missing descriptions in "
+            "'test_missing_args_static_method' docstring)", arg_count=3)
+    def test_missing_args_static_method(a, x, y, z=3, t=1):  # noqa: D213, D407
+        """Test a valid args section.
+
+        Parameters
+        ----------
+        x, y
+            Another parameter.
+        t : int
+            Yet another parameter.
+
+        """
+
+    @staticmethod
+    def test_mixing_numpy_and_google(danger):  # noqa: D213
+        """Repro for #388.
+
+        Parameters
+        ----------
+        danger
+            Zoneeeeee!
+
+        """
+
+
+class TestIncorrectIndent:  # noqa: D203
+    """Test class."""
+
+    @expect("D417: Missing argument descriptions in the docstring "
+            "(argument(s) y are missing descriptions in "
+            "'test_incorrect_indent' docstring)", arg_count=3)
+    def test_incorrect_indent(self, x=1, y=2):  # noqa: D207, D213, D407
+        """Reproducing issue #437.
+
+Testing this incorrectly indented docstring.
+
+        Args:
+            x: Test argument.
+
+        """
--- a/scripts/.flake8
+++ b/scripts/.flake8
@@ -0,0 +1,19 @@
+[flake8]
+exclude =
+    # Defaults
+    .svn,
+    CVS,
+    .bzr,
+    .hg,
+    .git,
+    __pycache__,
+    .tox,
+    .idea,
+    .mypy_cache,
+    .venv,
+    node_modules,
+    # Custom
+    _state_machine.py,
+    test_fstring.py,
+    bad_coding2.py,
+    badsyntax_*.py
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -1,4 +1,3 @@
-pub mod checkers;
 pub mod helpers;
 pub mod operations;
 pub mod relocate;
--- a/src/ast/checkers.rs
+++ b/src/ast/checkers.rs
--- a/src/ast/helpers.rs
+++ b/src/ast/helpers.rs
@@ -1,6 +1,6 @@
 use once_cell::sync::Lazy;
 use regex::Regex;
-use rustpython_ast::{Excepthandler, ExcepthandlerKind, Expr, ExprKind, StmtKind};
+use rustpython_ast::{Excepthandler, ExcepthandlerKind, Expr, ExprKind, Location, StmtKind};

 use crate::python::typing;

@@ -123,7 +123,7 @@ pub fn extract_handler_names(handlers: &[Excepthandler]) -> Vec<String> {
 }

 /// Returns `true` if a call is an argumented `super` invocation.
-pub fn is_super_call_with_arguments(func: &Expr, args: &Vec<Expr>) -> bool {
+pub fn is_super_call_with_arguments(func: &Expr, args: &[Expr]) -> bool {
    // Check: is this a `super` call?
    if let ExprKind::Name { id, .. } = &func.node {
        id == "super" && !args.is_empty()
@@ -131,3 +131,15 @@ pub fn is_super_call_with_arguments(func: &Expr, args: &Vec<Expr>) -> bool {
        false
    }
 }
+
+/// Convert a location within a file (relative to `base`) to an absolute position.
+pub fn to_absolute(relative: &Location, base: &Location) -> Location {
+    if relative.row() == 1 {
+        Location::new(
+            relative.row() + base.row() - 1,
+            relative.column() + base.column() - 1,
+        )
+    } else {
+        Location::new(relative.row() + base.row() - 1, relative.column())
+    }
+}
--- a/src/ast/operations.rs
+++ b/src/ast/operations.rs
@@ -121,7 +121,7 @@ pub fn is_unpacking_assignment(stmt: &Stmt) -> bool {
 /// Struct used to efficiently slice source code at (row, column) Locations.
 pub struct SourceCodeLocator<'a> {
    content: &'a str,
-    offsets: Vec<usize>,
+    offsets: Vec<Vec<usize>>,
    initialized: bool,
 }

@@ -137,26 +137,32 @@ impl<'a> SourceCodeLocator<'a> {
    fn init(&mut self) {
        if !self.initialized {
            let mut offset = 0;
-            for i in self.content.lines() {
-                self.offsets.push(offset);
-                offset += i.len();
-                offset += 1;
+            for line in self.content.lines() {
+                let mut newline = 0;
+                let mut line_offsets: Vec<usize> = vec![];
+                for (i, _char) in line.char_indices() {
+                    line_offsets.push(offset + i);
+                    newline = i + 1;
+                }
+                line_offsets.push(offset + newline);
+                self.offsets.push(line_offsets);
+                offset += newline + 1;
            }
-            self.offsets.push(offset);
+            self.offsets.push(vec![offset]);
            self.initialized = true;
        }
    }

    pub fn slice_source_code_at(&mut self, location: &Location) -> &'a str {
        self.init();
-        let offset = self.offsets[location.row() - 1] + location.column() - 1;
+        let offset = self.offsets[location.row() - 1][location.column() - 1];
        &self.content[offset..]
    }

    pub fn slice_source_code_range(&mut self, range: &Range) -> &'a str {
        self.init();
-        let start = self.offsets[range.location.row() - 1] + range.location.column() - 1;
-        let end = self.offsets[range.end_location.row() - 1] + range.end_location.column() - 1;
+        let start = self.offsets[range.location.row() - 1][range.location.column() - 1];
+        let end = self.offsets[range.end_location.row() - 1][range.end_location.column() - 1];
        &self.content[start..end]
    }

@@ -166,12 +172,10 @@ impl<'a> SourceCodeLocator<'a> {
        inner: &Range,
    ) -> (&'a str, &'a str, &'a str) {
        self.init();
-        let outer_start = self.offsets[outer.location.row() - 1] + outer.location.column() - 1;
-        let outer_end =
-            self.offsets[outer.end_location.row() - 1] + outer.end_location.column() - 1;
-        let inner_start = self.offsets[inner.location.row() - 1] + inner.location.column() - 1;
-        let inner_end =
-            self.offsets[inner.end_location.row() - 1] + inner.end_location.column() - 1;
+        let outer_start = self.offsets[outer.location.row() - 1][outer.location.column() - 1];
+        let outer_end = self.offsets[outer.end_location.row() - 1][outer.end_location.column() - 1];
+        let inner_start = self.offsets[inner.location.row() - 1][inner.location.column() - 1];
+        let inner_end = self.offsets[inner.end_location.row() - 1][inner.end_location.column() - 1];
        (
            &self.content[outer_start..inner_start],
            &self.content[inner_start..inner_end],
--- a/src/ast/relocate.rs
+++ b/src/ast/relocate.rs
@@ -4,14 +4,14 @@ use crate::ast::types::Range;

 fn relocate_keyword(keyword: &mut Keyword, location: Range) {
    keyword.location = location.location;
-    keyword.end_location = location.end_location;
+    keyword.end_location = Some(location.end_location);
    relocate_expr(&mut keyword.node.value, location);
 }

 /// Change an expression's location (recursively) to match a desired, fixed location.
 pub fn relocate_expr(expr: &mut Expr, location: Range) {
    expr.location = location.location;
-    expr.end_location = location.end_location;
+    expr.end_location = Some(location.end_location);
    match &mut expr.node {
        ExprKind::BoolOp { values, .. } => {
            for expr in values {
--- a/src/ast/types.rs
+++ b/src/ast/types.rs
@@ -18,7 +18,9 @@ impl Range {
    pub fn from_located<T>(located: &Located<T>) -> Self {
        Range {
            location: located.location,
-            end_location: located.end_location,
+            end_location: located
+                .end_location
+                .expect("AST nodes should have end_location."),
        }
    }
 }
--- a/src/autofix.rs
+++ b/src/autofix.rs
@@ -1,2 +0,0 @@
-pub mod fixer;
-pub mod fixes;
--- a/src/autofix/fixer.rs
+++ b/src/autofix/fixer.rs
@@ -1,11 +1,10 @@
-use std::fs;
-use std::path::Path;
-
-use anyhow::Result;
+use crate::autofix::Fix;
+use crate::autofix::Patch;
 use itertools::Itertools;
 use rustpython_parser::ast::Location;
+use std::collections::BTreeSet;

-use crate::checks::{Check, Fix};
+use crate::checks::Check;

 #[derive(Hash)]
 pub enum Mode {
@@ -24,51 +23,59 @@ impl From<bool> for Mode {
 }

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

-    let output = apply_fixes(
+    Some(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);
+    let mut output: String = Default::default();
+    let mut last_pos: Location = Default::default();
+    let mut applied: BTreeSet<&Patch> = Default::default();

-    for fix in fixes.sorted_by_key(|fix| fix.location) {
-        // Best-effort approach: if this fix overlaps with a fix we've already applied, skip it.
-        if last_pos > fix.location {
+    for fix in fixes.sorted_by_key(|fix| fix.patch.location) {
+        // If we already applied an identical fix as part of another correction, skip any
+        // re-application.
+        if applied.contains(&fix.patch) {
+            fix.applied = true;
            continue;
        }

-        if fix.location.row() > last_pos.row() {
+        // Best-effort approach: if this fix overlaps with a fix we've already applied, skip it.
+        if last_pos > fix.patch.location {
+            continue;
+        }
+
+        if fix.patch.location.row() > last_pos.row() {
            if last_pos.row() > 0 || last_pos.column() > 0 {
                output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
                output.push('\n');
            }
-            for line in &lines[last_pos.row()..fix.location.row() - 1] {
+            for line in &lines[last_pos.row()..fix.patch.location.row() - 1] {
                output.push_str(line);
                output.push('\n');
            }
-            output.push_str(&lines[fix.location.row() - 1][..fix.location.column() - 1]);
-            output.push_str(&fix.content);
+            output
+                .push_str(&lines[fix.patch.location.row() - 1][..fix.patch.location.column() - 1]);
+            output.push_str(&fix.patch.content);
        } else {
            output.push_str(
-                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.location.column() - 1],
+                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.patch.location.column() - 1],
            );
-            output.push_str(&fix.content);
+            output.push_str(&fix.patch.content);
        }
+        last_pos = fix.patch.end_location;

-        last_pos = fix.end_location;
+        applied.insert(&fix.patch);
        fix.applied = true;
    }

@@ -95,7 +102,8 @@ mod tests {
    use rustpython_parser::ast::Location;

    use crate::autofix::fixer::apply_fixes;
-    use crate::checks::Fix;
+    use crate::autofix::Fix;
+    use crate::autofix::Patch;

    #[test]
    fn empty_file() -> Result<()> {
@@ -111,9 +119,11 @@ mod tests {
    #[test]
    fn apply_single_replacement() -> Result<()> {
        let mut fixes = vec![Fix {
-            content: "Bar".to_string(),
-            location: Location::new(1, 9),
-            end_location: Location::new(1, 15),
+            patch: Patch {
+                content: "Bar".to_string(),
+                location: Location::new(1, 9),
+                end_location: Location::new(1, 15),
+            },
            applied: false,
        }];
        let actual = apply_fixes(
@@ -135,9 +145,11 @@ mod tests {
    #[test]
    fn apply_single_removal() -> Result<()> {
        let mut fixes = vec![Fix {
-            content: "".to_string(),
-            location: Location::new(1, 8),
-            end_location: Location::new(1, 16),
+            patch: Patch {
+                content: "".to_string(),
+                location: Location::new(1, 8),
+                end_location: Location::new(1, 16),
+            },
            applied: false,
        }];
        let actual = apply_fixes(
@@ -160,15 +172,19 @@ mod tests {
    fn apply_double_removal() -> Result<()> {
        let mut fixes = vec![
            Fix {
-                content: "".to_string(),
-                location: Location::new(1, 8),
-                end_location: Location::new(1, 17),
+                patch: Patch {
+                    content: "".to_string(),
+                    location: Location::new(1, 8),
+                    end_location: Location::new(1, 17),
+                },
                applied: false,
            },
            Fix {
-                content: "".to_string(),
-                location: Location::new(1, 17),
-                end_location: Location::new(1, 24),
+                patch: Patch {
+                    content: "".to_string(),
+                    location: Location::new(1, 17),
+                    end_location: Location::new(1, 24),
+                },
                applied: false,
            },
        ];
@@ -192,15 +208,19 @@ mod tests {
    fn ignore_overlapping_fixes() -> Result<()> {
        let mut fixes = vec![
            Fix {
-                content: "".to_string(),
-                location: Location::new(1, 8),
-                end_location: Location::new(1, 16),
+                patch: Patch {
+                    content: "".to_string(),
+                    location: Location::new(1, 8),
+                    end_location: Location::new(1, 16),
+                },
                applied: false,
            },
            Fix {
-                content: "ignored".to_string(),
-                location: Location::new(1, 10),
-                end_location: Location::new(1, 12),
+                patch: Patch {
+                    content: "ignored".to_string(),
+                    location: Location::new(1, 10),
+                    end_location: Location::new(1, 12),
+                },
                applied: false,
            },
        ];
--- a/src/autofix/fixes.rs
+++ b/src/autofix/fixes.rs
@@ -1,392 +0,0 @@
-use anyhow::Result;
-use itertools::Itertools;
-use libcst_native::ImportNames::Aliases;
-use libcst_native::NameOrAttribute::N;
-use libcst_native::{Codegen, Expression, SmallStatement, Statement};
-use rustpython_parser::ast::{ExcepthandlerKind, Expr, Keyword, Location, Stmt, StmtKind};
-use rustpython_parser::lexer;
-use rustpython_parser::token::Tok;
-
-use crate::ast::operations::SourceCodeLocator;
-use crate::ast::types::Range;
-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_at(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(),
-                location: start,
-                end_location: 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(),
-                location: start,
-                end_location: 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(),
-                location: start,
-                end_location: end,
-                applied: false,
-            }),
-            _ => None,
-        }
-    }
-}
-
-pub fn remove_super_arguments(locator: &mut SourceCodeLocator, expr: &Expr) -> Option<Fix> {
-    let range = Range::from_located(expr);
-    let contents = locator.slice_source_code_range(&range);
-
-    let mut tree = match libcst_native::parse_module(contents, None) {
-        Ok(m) => m,
-        Err(_) => return None,
-    };
-
-    if let Some(Statement::Simple(body)) = tree.body.first_mut() {
-        if let Some(SmallStatement::Expr(body)) = body.body.first_mut() {
-            if let Expression::Call(body) = &mut body.value {
-                body.args = vec![];
-                body.whitespace_before_args = Default::default();
-                body.whitespace_after_func = Default::default();
-
-                let mut state = Default::default();
-                tree.codegen(&mut state);
-
-                return Some(Fix {
-                    content: state.to_string(),
-                    location: range.location,
-                    end_location: range.end_location,
-                    applied: false,
-                });
-            }
-        }
-    }
-
-    None
-}
-
-/// Determine if a body contains only a single statement, taking into account deleted.
-fn has_single_child(body: &[Stmt], deleted: &[&Stmt]) -> bool {
-    body.iter().filter(|child| !deleted.contains(child)).count() == 1
-}
-
-/// Determine if a child is the only statement in its body.
-fn is_lone_child(child: &Stmt, parent: &Stmt, deleted: &[&Stmt]) -> Result<bool> {
-    match &parent.node {
-        StmtKind::FunctionDef { body, .. }
-        | StmtKind::AsyncFunctionDef { body, .. }
-        | StmtKind::ClassDef { body, .. }
-        | StmtKind::With { body, .. }
-        | StmtKind::AsyncWith { body, .. } => {
-            if body.iter().contains(child) {
-                Ok(has_single_child(body, deleted))
-            } else {
-                Err(anyhow::anyhow!("Unable to find child in parent body."))
-            }
-        }
-        StmtKind::For { body, orelse, .. }
-        | StmtKind::AsyncFor { body, orelse, .. }
-        | StmtKind::While { body, orelse, .. }
-        | StmtKind::If { body, orelse, .. } => {
-            if body.iter().contains(child) {
-                Ok(has_single_child(body, deleted))
-            } else if orelse.iter().contains(child) {
-                Ok(has_single_child(orelse, deleted))
-            } else {
-                Err(anyhow::anyhow!("Unable to find child in parent body."))
-            }
-        }
-        StmtKind::Try {
-            body,
-            handlers,
-            orelse,
-            finalbody,
-        } => {
-            if body.iter().contains(child) {
-                Ok(has_single_child(body, deleted))
-            } else if orelse.iter().contains(child) {
-                Ok(has_single_child(orelse, deleted))
-            } else if finalbody.iter().contains(child) {
-                Ok(has_single_child(finalbody, deleted))
-            } else if let Some(body) = handlers.iter().find_map(|handler| match &handler.node {
-                ExcepthandlerKind::ExceptHandler { body, .. } => {
-                    if body.iter().contains(child) {
-                        Some(body)
-                    } else {
-                        None
-                    }
-                }
-            }) {
-                Ok(has_single_child(body, deleted))
-            } else {
-                Err(anyhow::anyhow!("Unable to find child in parent body."))
-            }
-        }
-        _ => Err(anyhow::anyhow!("Unable to find child in parent body.")),
-    }
-}
-
-pub fn remove_stmt(stmt: &Stmt, parent: Option<&Stmt>, deleted: &[&Stmt]) -> Result<Fix> {
-    if parent
-        .map(|parent| is_lone_child(stmt, parent, deleted))
-        .map_or(Ok(None), |v| v.map(Some))?
-        .unwrap_or_default()
-    {
-        // If removing this node would lead to an invalid syntax tree, replace
-        // it with a `pass`.
-        Ok(Fix {
-            location: stmt.location,
-            end_location: stmt.end_location,
-            content: "pass".to_string(),
-            applied: false,
-        })
-    } else {
-        // Otherwise, nuke the entire line.
-        // TODO(charlie): This logic assumes that there are no multi-statement physical lines.
-        Ok(Fix {
-            location: Location::new(stmt.location.row(), 1),
-            end_location: Location::new(stmt.end_location.row() + 1, 1),
-            content: "".to_string(),
-            applied: false,
-        })
-    }
-}
-
-/// Generate a Fix to remove any unused imports from an `import` statement.
-pub fn remove_unused_imports(
-    locator: &mut SourceCodeLocator,
-    full_names: &[&str],
-    stmt: &Stmt,
-    parent: Option<&Stmt>,
-    deleted: &[&Stmt],
-) -> Result<Fix> {
-    let mut tree = match libcst_native::parse_module(
-        locator.slice_source_code_range(&Range::from_located(stmt)),
-        None,
-    ) {
-        Ok(m) => m,
-        Err(_) => return Err(anyhow::anyhow!("Failed to extract CST from source.")),
-    };
-
-    let body = if let Some(Statement::Simple(body)) = tree.body.first_mut() {
-        body
-    } else {
-        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple."));
-    };
-    let body = if let Some(SmallStatement::Import(body)) = body.body.first_mut() {
-        body
-    } else {
-        return Err(anyhow::anyhow!(
-            "Expected node to be: SmallStatement::ImportFrom."
-        ));
-    };
-    let aliases = &mut body.names;
-
-    // Preserve the trailing comma (or not) from the last entry.
-    let trailing_comma = aliases.last().and_then(|alias| alias.comma.clone());
-
-    // Identify unused imports from within the `import from`.
-    let mut removable = vec![];
-    for (index, alias) in aliases.iter().enumerate() {
-        if let N(import_name) = &alias.name {
-            if full_names.contains(&import_name.value) {
-                removable.push(index);
-            }
-        }
-    }
-    // TODO(charlie): This is quadratic.
-    for index in removable.iter().rev() {
-        aliases.remove(*index);
-    }
-
-    if let Some(alias) = aliases.last_mut() {
-        alias.comma = trailing_comma;
-    }
-
-    if aliases.is_empty() {
-        remove_stmt(stmt, parent, deleted)
-    } else {
-        let mut state = Default::default();
-        tree.codegen(&mut state);
-
-        Ok(Fix {
-            content: state.to_string(),
-            location: stmt.location,
-            end_location: stmt.end_location,
-            applied: false,
-        })
-    }
-}
-
-/// Generate a Fix to remove any unused imports from an `import from` statement.
-pub fn remove_unused_import_froms(
-    locator: &mut SourceCodeLocator,
-    full_names: &[&str],
-    stmt: &Stmt,
-    parent: Option<&Stmt>,
-    deleted: &[&Stmt],
-) -> Result<Fix> {
-    let mut tree = match libcst_native::parse_module(
-        locator.slice_source_code_range(&Range::from_located(stmt)),
-        None,
-    ) {
-        Ok(m) => m,
-        Err(_) => return Err(anyhow::anyhow!("Failed to extract CST from source.")),
-    };
-
-    let body = if let Some(Statement::Simple(body)) = tree.body.first_mut() {
-        body
-    } else {
-        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple."));
-    };
-    let body = if let Some(SmallStatement::ImportFrom(body)) = body.body.first_mut() {
-        body
-    } else {
-        return Err(anyhow::anyhow!(
-            "Expected node to be: SmallStatement::ImportFrom."
-        ));
-    };
-    let aliases = if let Aliases(aliases) = &mut body.names {
-        aliases
-    } else {
-        return Err(anyhow::anyhow!("Expected node to be: Aliases."));
-    };
-
-    // Preserve the trailing comma (or not) from the last entry.
-    let trailing_comma = aliases.last().and_then(|alias| alias.comma.clone());
-
-    // Identify unused imports from within the `import from`.
-    let mut removable = vec![];
-    for (index, alias) in aliases.iter().enumerate() {
-        if let N(name) = &alias.name {
-            let import_name = if let Some(N(module_name)) = &body.module {
-                format!("{}.{}", module_name.value, name.value)
-            } else {
-                name.value.to_string()
-            };
-            if full_names.contains(&import_name.as_str()) {
-                removable.push(index);
-            }
-        }
-    }
-    // TODO(charlie): This is quadratic.
-    for index in removable.iter().rev() {
-        aliases.remove(*index);
-    }
-
-    if let Some(alias) = aliases.last_mut() {
-        alias.comma = trailing_comma;
-    }
-
-    if aliases.is_empty() {
-        remove_stmt(stmt, parent, deleted)
-    } else {
-        let mut state = Default::default();
-        tree.codegen(&mut state);
-
-        Ok(Fix {
-            content: state.to_string(),
-            location: stmt.location,
-            end_location: stmt.end_location,
-            applied: false,
-        })
-    }
-}
--- a/src/autofix/helpers.rs
+++ b/src/autofix/helpers.rs
@@ -0,0 +1,89 @@
+use anyhow::Result;
+use itertools::Itertools;
+use rustpython_parser::ast::{ExcepthandlerKind, Location, Stmt, StmtKind};
+
+use crate::autofix::Fix;
+
+/// Determine if a body contains only a single statement, taking into account deleted.
+fn has_single_child(body: &[Stmt], deleted: &[&Stmt]) -> bool {
+    body.iter().filter(|child| !deleted.contains(child)).count() == 1
+}
+
+/// Determine if a child is the only statement in its body.
+fn is_lone_child(child: &Stmt, parent: &Stmt, deleted: &[&Stmt]) -> Result<bool> {
+    match &parent.node {
+        StmtKind::FunctionDef { body, .. }
+        | StmtKind::AsyncFunctionDef { body, .. }
+        | StmtKind::ClassDef { body, .. }
+        | StmtKind::With { body, .. }
+        | StmtKind::AsyncWith { body, .. } => {
+            if body.iter().contains(child) {
+                Ok(has_single_child(body, deleted))
+            } else {
+                Err(anyhow::anyhow!("Unable to find child in parent body."))
+            }
+        }
+        StmtKind::For { body, orelse, .. }
+        | StmtKind::AsyncFor { body, orelse, .. }
+        | StmtKind::While { body, orelse, .. }
+        | StmtKind::If { body, orelse, .. } => {
+            if body.iter().contains(child) {
+                Ok(has_single_child(body, deleted))
+            } else if orelse.iter().contains(child) {
+                Ok(has_single_child(orelse, deleted))
+            } else {
+                Err(anyhow::anyhow!("Unable to find child in parent body."))
+            }
+        }
+        StmtKind::Try {
+            body,
+            handlers,
+            orelse,
+            finalbody,
+        } => {
+            if body.iter().contains(child) {
+                Ok(has_single_child(body, deleted))
+            } else if orelse.iter().contains(child) {
+                Ok(has_single_child(orelse, deleted))
+            } else if finalbody.iter().contains(child) {
+                Ok(has_single_child(finalbody, deleted))
+            } else if let Some(body) = handlers.iter().find_map(|handler| match &handler.node {
+                ExcepthandlerKind::ExceptHandler { body, .. } => {
+                    if body.iter().contains(child) {
+                        Some(body)
+                    } else {
+                        None
+                    }
+                }
+            }) {
+                Ok(has_single_child(body, deleted))
+            } else {
+                Err(anyhow::anyhow!("Unable to find child in parent body."))
+            }
+        }
+        _ => Err(anyhow::anyhow!("Unable to find child in parent body.")),
+    }
+}
+
+pub fn remove_stmt(stmt: &Stmt, parent: Option<&Stmt>, deleted: &[&Stmt]) -> Result<Fix> {
+    if parent
+        .map(|parent| is_lone_child(stmt, parent, deleted))
+        .map_or(Ok(None), |v| v.map(Some))?
+        .unwrap_or_default()
+    {
+        // If removing this node would lead to an invalid syntax tree, replace
+        // it with a `pass`.
+        Ok(Fix::replacement(
+            "pass".to_string(),
+            stmt.location,
+            stmt.end_location.unwrap(),
+        ))
+    } else {
+        // Otherwise, nuke the entire line.
+        // TODO(charlie): This logic assumes that there are no multi-statement physical lines.
+        Ok(Fix::deletion(
+            Location::new(stmt.location.row(), 1),
+            Location::new(stmt.end_location.unwrap().row() + 1, 1),
+        ))
+    }
+}
--- a/src/autofix/mod.rs
+++ b/src/autofix/mod.rs
@@ -0,0 +1,53 @@
+use rustpython_ast::Location;
+use serde::{Deserialize, Serialize};
+
+pub mod fixer;
+pub mod helpers;
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
+pub struct Patch {
+    pub content: String,
+    pub location: Location,
+    pub end_location: Location,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Fix {
+    pub patch: Patch,
+    pub applied: bool,
+}
+
+impl Fix {
+    pub fn deletion(start: Location, end: Location) -> Self {
+        Self {
+            patch: Patch {
+                content: "".to_string(),
+                location: start,
+                end_location: end,
+            },
+            applied: false,
+        }
+    }
+
+    pub fn replacement(content: String, start: Location, end: Location) -> Self {
+        Self {
+            patch: Patch {
+                content,
+                location: start,
+                end_location: end,
+            },
+            applied: false,
+        }
+    }
+
+    pub fn insertion(content: String, at: Location) -> Self {
+        Self {
+            patch: Patch {
+                content,
+                location: at,
+                end_location: at,
+            },
+            applied: false,
+        }
+    }
+}
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,3 +1,9 @@
+// cacache uses asyncd-std which has no wasm support, so currently no caching support on wasm
+#![cfg_attr(
+    target_family = "wasm",
+    allow(unused_imports, unused_variables, dead_code)
+)]
+
 use std::collections::hash_map::DefaultHasher;
 use std::fs::{create_dir_all, File, Metadata};
 use std::hash::{Hash, Hasher};
@@ -5,6 +11,7 @@ use std::io::Write;
 use std::path::Path;

 use anyhow::Result;
+#[cfg(not(target_family = "wasm"))]
 use cacache::Error::EntryNotFound;
 use filetime::FileTime;
 use log::error;
@@ -107,6 +114,7 @@ pub fn get(
        return None;
    };

+    #[cfg(not(target_family = "wasm"))] // cacache needs async-std which doesn't support wasm
    match cacache::read_sync(cache_dir(), cache_key(path, settings, autofix)) {
        Ok(encoded) => match bincode::deserialize::<CheckResult>(&encoded[..]) {
            Ok(CheckResult {
@@ -137,12 +145,14 @@ pub fn set(
        return;
    };

+    #[cfg(not(target_family = "wasm"))] // modification date not supported on wasm
    let check_result = CheckResultRef {
        metadata: &CacheMetadata {
            mtime: FileTime::from_last_modification_time(metadata).unix_seconds(),
        },
        messages,
    };
+    #[cfg(not(target_family = "wasm"))] // cacache needs async-std which doesn't support wasm
    if let Err(e) = cacache::write_sync(
        cache_dir(),
        cache_key(path, settings, autofix),
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
--- a/src/check_lines.rs
+++ b/src/check_lines.rs
@@ -4,7 +4,8 @@ use rustpython_parser::ast::Location;

 use crate::ast::types::Range;
 use crate::autofix::fixer;
-use crate::checks::{Check, CheckCode, CheckKind, Fix};
+use crate::autofix::Fix;
+use crate::checks::{Check, CheckCode, CheckKind};
 use crate::noqa;
 use crate::noqa::Directive;
 use crate::settings::Settings;
@@ -166,15 +167,10 @@ pub fn check_lines(
                            },
                        );
                        if matches!(autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
-                            check.amend(Fix {
-                                content: "".to_string(),
-                                location: Location::new(row + 1, start + 1),
-                                end_location: Location::new(
-                                    row + 1,
-                                    lines[row].chars().count() + 1,
-                                ),
-                                applied: false,
-                            });
+                            check.amend(Fix::deletion(
+                                Location::new(row + 1, start + 1),
+                                Location::new(row + 1, lines[row].chars().count() + 1),
+                            ));
                        }
                        line_checks.push(check);
                    }
@@ -200,25 +196,16 @@ pub fn check_lines(
                        );
                        if matches!(autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
                            if valid_codes.is_empty() {
-                                check.amend(Fix {
-                                    content: "".to_string(),
-                                    location: Location::new(row + 1, start + 1),
-                                    end_location: Location::new(
-                                        row + 1,
-                                        lines[row].chars().count() + 1,
-                                    ),
-                                    applied: false,
-                                });
+                                check.amend(Fix::deletion(
+                                    Location::new(row + 1, start + 1),
+                                    Location::new(row + 1, lines[row].chars().count() + 1),
+                                ));
                            } else {
-                                check.amend(Fix {
-                                    content: format!("  # noqa: {}", valid_codes.join(", ")),
-                                    location: Location::new(row + 1, start + 1),
-                                    end_location: Location::new(
-                                        row + 1,
-                                        lines[row].chars().count() + 1,
-                                    ),
-                                    applied: false,
-                                });
+                                check.amend(Fix::replacement(
+                                    format!("  # noqa: {}", valid_codes.join(", ")),
+                                    Location::new(row + 1, start + 1),
+                                    Location::new(row + 1, lines[row].chars().count() + 1),
+                                ));
                            }
                        }
                        line_checks.push(check);
--- a/src/checks.rs
+++ b/src/checks.rs
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -17,6 +17,9 @@ use crate::RawSettings;
 pub struct Cli {
    #[arg(required = true)]
    pub files: Vec<PathBuf>,
+    /// Path to the `pyproject.toml` file to use for configuration.
+    #[arg(long)]
+    pub config: Option<PathBuf>,
    /// Enable verbose logging.
    #[arg(short, long)]
    pub verbose: bool,
@@ -100,9 +103,9 @@ impl fmt::Display for Warnable {
 /// Warn the user if they attempt to enable a code that won't be respected.
 pub fn warn_on(
    flag: Warnable,
-    codes: &Vec<CheckCode>,
-    cli_ignore: &Vec<CheckCode>,
-    cli_extend_ignore: &Vec<CheckCode>,
+    codes: &[CheckCode],
+    cli_ignore: &[CheckCode],
+    cli_extend_ignore: &[CheckCode],
    pyproject_settings: &RawSettings,
    pyproject_path: &Option<PathBuf>,
 ) {
--- a/src/docstrings.rs
+++ b/src/docstrings.rs
@@ -1,633 +0,0 @@
-use once_cell::sync::Lazy;
-use regex::Regex;
-use rustpython_ast::{Constant, Expr, ExprKind, Location, Stmt, StmtKind};
-
-use crate::ast::types::Range;
-use crate::check_ast::Checker;
-use crate::checks::{Check, CheckCode, CheckKind};
-use crate::visibility::{is_init, is_magic, is_overload, Modifier, Visibility, VisibleScope};
-
-#[derive(Debug)]
-pub enum DefinitionKind<'a> {
-    Module,
-    Package,
-    Class(&'a Stmt),
-    NestedClass(&'a Stmt),
-    Function(&'a Stmt),
-    NestedFunction(&'a Stmt),
-    Method(&'a Stmt),
-}
-
-#[derive(Debug)]
-pub struct Definition<'a> {
-    pub kind: DefinitionKind<'a>,
-    pub docstring: Option<&'a Expr>,
-}
-
-pub enum Documentable {
-    Class,
-    Function,
-}
-
-/// Extract a docstring from a function or class body.
-pub fn docstring_from(suite: &[Stmt]) -> Option<&Expr> {
-    if let Some(stmt) = suite.first() {
-        if let StmtKind::Expr { value } = &stmt.node {
-            if matches!(
-                &value.node,
-                ExprKind::Constant {
-                    value: Constant::Str(_),
-                    ..
-                }
-            ) {
-                return Some(value);
-            }
-        }
-    }
-    None
-}
-
-/// Extract a `Definition` from the AST node defined by a `Stmt`.
-pub fn extract<'a>(
-    scope: &VisibleScope,
-    stmt: &'a Stmt,
-    body: &'a [Stmt],
-    kind: &Documentable,
-) -> Definition<'a> {
-    let expr = docstring_from(body);
-    match kind {
-        Documentable::Function => match scope {
-            VisibleScope {
-                modifier: Modifier::Module,
-                ..
-            } => Definition {
-                kind: DefinitionKind::Function(stmt),
-                docstring: expr,
-            },
-            VisibleScope {
-                modifier: Modifier::Class,
-                ..
-            } => Definition {
-                kind: DefinitionKind::Method(stmt),
-                docstring: expr,
-            },
-            VisibleScope {
-                modifier: Modifier::Function,
-                ..
-            } => Definition {
-                kind: DefinitionKind::NestedFunction(stmt),
-                docstring: expr,
-            },
-        },
-        Documentable::Class => match scope {
-            VisibleScope {
-                modifier: Modifier::Module,
-                ..
-            } => Definition {
-                kind: DefinitionKind::Class(stmt),
-                docstring: expr,
-            },
-            VisibleScope {
-                modifier: Modifier::Class,
-                ..
-            } => Definition {
-                kind: DefinitionKind::NestedClass(stmt),
-                docstring: expr,
-            },
-            VisibleScope {
-                modifier: Modifier::Function,
-                ..
-            } => Definition {
-                kind: DefinitionKind::NestedClass(stmt),
-                docstring: expr,
-            },
-        },
-    }
-}
-
-/// Extract the source code range for a docstring.
-fn range_for(docstring: &Expr) -> Range {
-    // RustPython currently omits the first quotation mark in a string, so offset the location.
-    Range {
-        location: Location::new(docstring.location.row(), docstring.location.column() - 1),
-        end_location: docstring.end_location,
-    }
-}
-
-/// D100, D101, D102, D103, D104, D105, D106, D107
-pub fn not_missing(
-    checker: &mut Checker,
-    definition: &Definition,
-    visibility: &Visibility,
-) -> bool {
-    if matches!(visibility, Visibility::Private) {
-        return true;
-    }
-
-    if definition.docstring.is_some() {
-        return true;
-    }
-
-    match definition.kind {
-        DefinitionKind::Module => {
-            if checker.settings.enabled.contains(&CheckCode::D100) {
-                checker.add_check(Check::new(
-                    CheckKind::PublicModule,
-                    Range {
-                        location: Location::new(1, 1),
-                        end_location: Location::new(1, 1),
-                    },
-                ));
-            }
-            false
-        }
-        DefinitionKind::Package => {
-            if checker.settings.enabled.contains(&CheckCode::D104) {
-                checker.add_check(Check::new(
-                    CheckKind::PublicPackage,
-                    Range {
-                        location: Location::new(1, 1),
-                        end_location: Location::new(1, 1),
-                    },
-                ));
-            }
-            false
-        }
-        DefinitionKind::Class(stmt) => {
-            if checker.settings.enabled.contains(&CheckCode::D101) {
-                checker.add_check(Check::new(
-                    CheckKind::PublicClass,
-                    Range::from_located(stmt),
-                ));
-            }
-            false
-        }
-        DefinitionKind::NestedClass(stmt) => {
-            if checker.settings.enabled.contains(&CheckCode::D106) {
-                checker.add_check(Check::new(
-                    CheckKind::PublicNestedClass,
-                    Range::from_located(stmt),
-                ));
-            }
-            false
-        }
-        DefinitionKind::Function(stmt) | DefinitionKind::NestedFunction(stmt) => {
-            if is_overload(stmt) {
-                true
-            } else {
-                if checker.settings.enabled.contains(&CheckCode::D103) {
-                    checker.add_check(Check::new(
-                        CheckKind::PublicFunction,
-                        Range::from_located(stmt),
-                    ));
-                }
-                false
-            }
-        }
-        DefinitionKind::Method(stmt) => {
-            if is_overload(stmt) {
-                true
-            } else if is_magic(stmt) {
-                if checker.settings.enabled.contains(&CheckCode::D105) {
-                    checker.add_check(Check::new(
-                        CheckKind::MagicMethod,
-                        Range::from_located(stmt),
-                    ));
-                }
-                true
-            } else if is_init(stmt) {
-                if checker.settings.enabled.contains(&CheckCode::D107) {
-                    checker.add_check(Check::new(CheckKind::PublicInit, Range::from_located(stmt)));
-                }
-                true
-            } else {
-                if checker.settings.enabled.contains(&CheckCode::D102) {
-                    checker.add_check(Check::new(
-                        CheckKind::PublicMethod,
-                        Range::from_located(stmt),
-                    ));
-                }
-                true
-            }
-        }
-    }
-}
-
-/// D200
-pub fn one_liner(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = &definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            let mut line_count = 0;
-            let mut non_empty_line_count = 0;
-            for line in string.lines() {
-                line_count += 1;
-                if !line.trim().is_empty() {
-                    non_empty_line_count += 1;
-                }
-                if non_empty_line_count > 1 {
-                    break;
-                }
-            }
-
-            if non_empty_line_count == 1 && line_count > 1 {
-                checker.add_check(Check::new(CheckKind::FitsOnOneLine, range_for(docstring)));
-            }
-        }
-    }
-}
-
-static COMMENT_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^\s*#").unwrap());
-
-static INNER_FUNCTION_OR_CLASS_REGEX: Lazy<Regex> =
-    Lazy::new(|| Regex::new(r"^\s+(?:(?:class|def|async def)\s|@)").unwrap());
-
-/// D201, D202
-pub fn blank_before_after_function(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let DefinitionKind::Function(parent)
-        | DefinitionKind::NestedFunction(parent)
-        | DefinitionKind::Method(parent) = &definition.kind
-        {
-            if let ExprKind::Constant {
-                value: Constant::Str(_),
-                ..
-            } = &docstring.node
-            {
-                let (before, _, after) = checker
-                    .locator
-                    .partition_source_code_at(&Range::from_located(parent), &range_for(docstring));
-
-                if checker.settings.enabled.contains(&CheckCode::D201) {
-                    let blank_lines_before = before
-                        .lines()
-                        .rev()
-                        .skip(1)
-                        .take_while(|line| line.trim().is_empty())
-                        .count();
-                    if blank_lines_before != 0 {
-                        checker.add_check(Check::new(
-                            CheckKind::NoBlankLineBeforeFunction(blank_lines_before),
-                            range_for(docstring),
-                        ));
-                    }
-                }
-
-                if checker.settings.enabled.contains(&CheckCode::D202) {
-                    let blank_lines_after = after
-                        .lines()
-                        .skip(1)
-                        .take_while(|line| line.trim().is_empty())
-                        .count();
-                    let all_blank_after = after
-                        .lines()
-                        .skip(1)
-                        .all(|line| line.trim().is_empty() || COMMENT_REGEX.is_match(line));
-                    // Report a D202 violation if the docstring is followed by a blank line
-                    // and the blank line is not itself followed by an inner function or
-                    // class.
-                    if !all_blank_after
-                        && blank_lines_after != 0
-                        && !(blank_lines_after == 1
-                            && INNER_FUNCTION_OR_CLASS_REGEX.is_match(after))
-                    {
-                        checker.add_check(Check::new(
-                            CheckKind::NoBlankLineAfterFunction(blank_lines_after),
-                            range_for(docstring),
-                        ));
-                    }
-                }
-            }
-        }
-    }
-}
-
-/// D203, D204, D211
-pub fn blank_before_after_class(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = &definition.docstring {
-        if let DefinitionKind::Class(parent) | DefinitionKind::NestedClass(parent) =
-            &definition.kind
-        {
-            if let ExprKind::Constant {
-                value: Constant::Str(_),
-                ..
-            } = &docstring.node
-            {
-                let (before, _, after) = checker
-                    .locator
-                    .partition_source_code_at(&Range::from_located(parent), &range_for(docstring));
-
-                if checker.settings.enabled.contains(&CheckCode::D203)
-                    || checker.settings.enabled.contains(&CheckCode::D211)
-                {
-                    let blank_lines_before = before
-                        .lines()
-                        .rev()
-                        .skip(1)
-                        .take_while(|line| line.trim().is_empty())
-                        .count();
-                    if blank_lines_before != 0
-                        && checker.settings.enabled.contains(&CheckCode::D211)
-                    {
-                        checker.add_check(Check::new(
-                            CheckKind::NoBlankLineBeforeClass(blank_lines_before),
-                            range_for(docstring),
-                        ));
-                    }
-                    if blank_lines_before != 1
-                        && checker.settings.enabled.contains(&CheckCode::D203)
-                    {
-                        checker.add_check(Check::new(
-                            CheckKind::OneBlankLineBeforeClass(blank_lines_before),
-                            range_for(docstring),
-                        ));
-                    }
-                }
-
-                if checker.settings.enabled.contains(&CheckCode::D204) {
-                    let blank_lines_after = after
-                        .lines()
-                        .skip(1)
-                        .take_while(|line| line.trim().is_empty())
-                        .count();
-                    let all_blank_after = after
-                        .lines()
-                        .skip(1)
-                        .all(|line| line.trim().is_empty() || COMMENT_REGEX.is_match(line));
-                    if !all_blank_after && blank_lines_after != 1 {
-                        checker.add_check(Check::new(
-                            CheckKind::OneBlankLineAfterClass(blank_lines_after),
-                            range_for(docstring),
-                        ));
-                    }
-                }
-            }
-        }
-    }
-}
-
-/// D205
-pub fn blank_after_summary(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            let mut lines_count = 1;
-            let mut blanks_count = 0;
-            for line in string.trim().lines().skip(1) {
-                lines_count += 1;
-                if line.trim().is_empty() {
-                    blanks_count += 1;
-                } else {
-                    break;
-                }
-            }
-            if lines_count > 1 && blanks_count != 1 {
-                checker.add_check(Check::new(
-                    CheckKind::NoBlankLineAfterSummary,
-                    range_for(docstring),
-                ));
-            }
-        }
-    }
-}
-
-/// D209
-pub fn newline_after_last_paragraph(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            let mut line_count = 0;
-            for line in string.lines() {
-                if !line.trim().is_empty() {
-                    line_count += 1;
-                }
-                if line_count > 1 {
-                    let content = checker
-                        .locator
-                        .slice_source_code_range(&range_for(docstring));
-                    if let Some(line) = content.lines().last() {
-                        let line = line.trim();
-                        if line != "\"\"\"" && line != "'''" {
-                            checker.add_check(Check::new(
-                                CheckKind::NewLineAfterLastParagraph,
-                                range_for(docstring),
-                            ));
-                        }
-                    }
-                    return;
-                }
-            }
-        }
-    }
-}
-
-/// D210
-pub fn no_surrounding_whitespace(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            let mut lines = string.lines();
-            if let Some(line) = lines.next() {
-                if line.trim().is_empty() {
-                    return;
-                }
-                if line.starts_with(' ') || (matches!(lines.next(), None) && line.ends_with(' ')) {
-                    checker.add_check(Check::new(
-                        CheckKind::NoSurroundingWhitespace,
-                        range_for(docstring),
-                    ));
-                }
-            }
-        }
-    }
-}
-
-/// D212, D213
-pub fn multi_line_summary_start(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            if string.lines().nth(1).is_some() {
-                let content = checker
-                    .locator
-                    .slice_source_code_range(&range_for(docstring));
-                if let Some(first_line) = content.lines().next() {
-                    let first_line = first_line.trim();
-                    if first_line == "\"\"\"" || first_line == "'''" {
-                        if checker.settings.enabled.contains(&CheckCode::D212) {
-                            checker.add_check(Check::new(
-                                CheckKind::MultiLineSummaryFirstLine,
-                                range_for(docstring),
-                            ));
-                        }
-                    } else if checker.settings.enabled.contains(&CheckCode::D213) {
-                        checker.add_check(Check::new(
-                            CheckKind::MultiLineSummarySecondLine,
-                            range_for(docstring),
-                        ));
-                    }
-                }
-            }
-        }
-    }
-}
-
-/// D300
-pub fn triple_quotes(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            let content = checker
-                .locator
-                .slice_source_code_range(&range_for(docstring));
-            if string.contains("\"\"\"") {
-                if !content.starts_with("'''") {
-                    checker.add_check(Check::new(
-                        CheckKind::UsesTripleQuotes,
-                        range_for(docstring),
-                    ));
-                }
-            } else if !content.starts_with("\"\"\"") {
-                checker.add_check(Check::new(
-                    CheckKind::UsesTripleQuotes,
-                    range_for(docstring),
-                ));
-            }
-        }
-    }
-}
-
-/// D400
-pub fn ends_with_period(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            if let Some(string) = string.lines().next() {
-                if !string.ends_with('.') {
-                    checker.add_check(Check::new(CheckKind::EndsInPeriod, range_for(docstring)));
-                }
-            }
-        }
-    }
-}
-
-/// D402
-pub fn no_signature(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let DefinitionKind::Function(parent)
-        | DefinitionKind::NestedFunction(parent)
-        | DefinitionKind::Method(parent) = definition.kind
-        {
-            if let StmtKind::FunctionDef { name, .. } = &parent.node {
-                if let ExprKind::Constant {
-                    value: Constant::Str(string),
-                    ..
-                } = &docstring.node
-                {
-                    if let Some(first_line) = string.lines().next() {
-                        if first_line.contains(&format!("{name}(")) {
-                            checker.add_check(Check::new(
-                                CheckKind::NoSignature,
-                                range_for(docstring),
-                            ));
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
-/// D403
-pub fn capitalized(checker: &mut Checker, definition: &Definition) {
-    if !matches!(definition.kind, DefinitionKind::Function(_)) {
-        return;
-    }
-
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            if let Some(first_word) = string.split(' ').next() {
-                if first_word == first_word.to_uppercase() {
-                    return;
-                }
-                for char in first_word.chars() {
-                    if !char.is_ascii_alphabetic() && char != '\'' {
-                        return;
-                    }
-                }
-                if let Some(first_char) = first_word.chars().next() {
-                    if !first_char.is_uppercase() {
-                        checker.add_check(Check::new(
-                            CheckKind::FirstLineCapitalized,
-                            range_for(docstring),
-                        ));
-                    }
-                }
-            }
-        }
-    }
-}
-
-/// D415
-pub fn ends_with_punctuation(checker: &mut Checker, definition: &Definition) {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            if let Some(string) = string.lines().next() {
-                if !(string.ends_with('.') || string.ends_with('!') || string.ends_with('?')) {
-                    checker.add_check(Check::new(
-                        CheckKind::EndsInPunctuation,
-                        range_for(docstring),
-                    ));
-                }
-            }
-        }
-    }
-}
-
-/// D419
-pub fn not_empty(checker: &mut Checker, definition: &Definition) -> bool {
-    if let Some(docstring) = definition.docstring {
-        if let ExprKind::Constant {
-            value: Constant::Str(string),
-            ..
-        } = &docstring.node
-        {
-            if string.trim().is_empty() {
-                if checker.settings.enabled.contains(&CheckCode::D419) {
-                    checker.add_check(Check::new(CheckKind::NonEmpty, range_for(docstring)));
-                }
-                return false;
-            }
-        }
-    }
-    true
-}
--- a/src/docstrings/definition.rs
+++ b/src/docstrings/definition.rs
@@ -0,0 +1,23 @@
+use rustpython_ast::{Expr, Stmt};
+
+#[derive(Debug)]
+pub enum DefinitionKind<'a> {
+    Module,
+    Package,
+    Class(&'a Stmt),
+    NestedClass(&'a Stmt),
+    Function(&'a Stmt),
+    NestedFunction(&'a Stmt),
+    Method(&'a Stmt),
+}
+
+#[derive(Debug)]
+pub struct Definition<'a> {
+    pub kind: DefinitionKind<'a>,
+    pub docstring: Option<&'a Expr>,
+}
+
+pub enum Documentable {
+    Class,
+    Function,
+}
--- a/src/docstrings/extraction.rs
+++ b/src/docstrings/extraction.rs
@@ -0,0 +1,82 @@
+//! Extract docstrings from an AST.
+
+use rustpython_ast::{Constant, Expr, ExprKind, Stmt, StmtKind};
+
+use crate::docstrings::definition::{Definition, DefinitionKind, Documentable};
+use crate::visibility::{Modifier, VisibleScope};
+
+/// Extract a docstring from a function or class body.
+pub fn docstring_from(suite: &[Stmt]) -> Option<&Expr> {
+    if let Some(stmt) = suite.first() {
+        if let StmtKind::Expr { value } = &stmt.node {
+            if matches!(
+                &value.node,
+                ExprKind::Constant {
+                    value: Constant::Str(_),
+                    ..
+                }
+            ) {
+                return Some(value);
+            }
+        }
+    }
+    None
+}
+
+/// Extract a `Definition` from the AST node defined by a `Stmt`.
+pub fn extract<'a>(
+    scope: &VisibleScope,
+    stmt: &'a Stmt,
+    body: &'a [Stmt],
+    kind: &Documentable,
+) -> Definition<'a> {
+    let expr = docstring_from(body);
+    match kind {
+        Documentable::Function => match scope {
+            VisibleScope {
+                modifier: Modifier::Module,
+                ..
+            } => Definition {
+                kind: DefinitionKind::Function(stmt),
+                docstring: expr,
+            },
+            VisibleScope {
+                modifier: Modifier::Class,
+                ..
+            } => Definition {
+                kind: DefinitionKind::Method(stmt),
+                docstring: expr,
+            },
+            VisibleScope {
+                modifier: Modifier::Function,
+                ..
+            } => Definition {
+                kind: DefinitionKind::NestedFunction(stmt),
+                docstring: expr,
+            },
+        },
+        Documentable::Class => match scope {
+            VisibleScope {
+                modifier: Modifier::Module,
+                ..
+            } => Definition {
+                kind: DefinitionKind::Class(stmt),
+                docstring: expr,
+            },
+            VisibleScope {
+                modifier: Modifier::Class,
+                ..
+            } => Definition {
+                kind: DefinitionKind::NestedClass(stmt),
+                docstring: expr,
+            },
+            VisibleScope {
+                modifier: Modifier::Function,
+                ..
+            } => Definition {
+                kind: DefinitionKind::NestedClass(stmt),
+                docstring: expr,
+            },
+        },
+    }
+}
--- a/src/docstrings/google.rs
+++ b/src/docstrings/google.rs
@@ -0,0 +1,71 @@
+//! Abstractions for Google-style docstrings.
+
+use std::collections::BTreeSet;
+
+use once_cell::sync::Lazy;
+
+pub(crate) static GOOGLE_SECTION_NAMES: Lazy<BTreeSet<&'static str>> = Lazy::new(|| {
+    BTreeSet::from([
+        "Args",
+        "Arguments",
+        "Attention",
+        "Attributes",
+        "Caution",
+        "Danger",
+        "Error",
+        "Example",
+        "Examples",
+        "Hint",
+        "Important",
+        "Keyword Args",
+        "Keyword Arguments",
+        "Methods",
+        "Note",
+        "Notes",
+        "Return",
+        "Returns",
+        "Raises",
+        "References",
+        "See Also",
+        "Tip",
+        "Todo",
+        "Warning",
+        "Warnings",
+        "Warns",
+        "Yield",
+        "Yields",
+    ])
+});
+
+pub(crate) static LOWERCASE_GOOGLE_SECTION_NAMES: Lazy<BTreeSet<&'static str>> = Lazy::new(|| {
+    BTreeSet::from([
+        "args",
+        "arguments",
+        "attention",
+        "attributes",
+        "caution",
+        "danger",
+        "error",
+        "example",
+        "examples",
+        "hint",
+        "important",
+        "keyword args",
+        "keyword arguments",
+        "methods",
+        "note",
+        "notes",
+        "return",
+        "returns",
+        "raises",
+        "references",
+        "see also",
+        "tip",
+        "todo",
+        "warning",
+        "warnings",
+        "warns",
+        "yield",
+        "yields",
+    ])
+});
--- a/src/docstrings/helpers.rs
+++ b/src/docstrings/helpers.rs
@@ -0,0 +1,42 @@
+use rustpython_ast::{Expr, Location};
+
+use crate::ast::types::Range;
+use crate::check_ast::Checker;
+
+pub const TRIPLE_QUOTE_PREFIXES: &[&str] = &[
+    "ur\"\"\"", "ur'''", "u\"\"\"", "u'''", "r\"\"\"", "r'''", "\"\"\"", "'''",
+];
+
+pub const SINGLE_QUOTE_PREFIXES: &[&str] = &["ur\"", "ur'", "u\"", "u'", "r\"", "r'", "\"", "'"];
+
+/// Extract the leading words from a line of text.
+pub fn leading_words(line: &str) -> String {
+    line.trim()
+        .chars()
+        .take_while(|char| char.is_alphanumeric() || char.is_whitespace())
+        .collect()
+}
+
+/// Extract the leading whitespace from a line of text.
+pub fn leading_space(line: &str) -> String {
+    line.chars()
+        .take_while(|char| char.is_whitespace())
+        .collect()
+}
+
+/// Extract the leading indentation from a docstring.
+pub fn indentation<'a>(checker: &'a mut Checker, docstring: &Expr) -> &'a str {
+    let range = Range::from_located(docstring);
+    checker.locator.slice_source_code_range(&Range {
+        location: Location::new(range.location.row(), 1),
+        end_location: Location::new(range.location.row(), range.location.column()),
+    })
+}
+
+/// Replace any non-whitespace characters from an indentation string.
+pub fn clean(indentation: &str) -> String {
+    indentation
+        .chars()
+        .map(|char| if char.is_whitespace() { char } else { ' ' })
+        .collect()
+}
--- a/src/docstrings/mod.rs
+++ b/src/docstrings/mod.rs
@@ -0,0 +1,7 @@
+pub mod definition;
+pub mod extraction;
+pub mod google;
+pub mod helpers;
+pub mod numpy;
+pub mod sections;
+pub mod styles;
--- a/src/docstrings/numpy.rs
+++ b/src/docstrings/numpy.rs
@@ -0,0 +1,41 @@
+//! Abstractions for NumPy-style docstrings.
+
+use std::collections::BTreeSet;
+
+use once_cell::sync::Lazy;
+
+pub(crate) static LOWERCASE_NUMPY_SECTION_NAMES: Lazy<BTreeSet<&'static str>> = Lazy::new(|| {
+    BTreeSet::from([
+        "short summary",
+        "extended summary",
+        "parameters",
+        "returns",
+        "yields",
+        "other parameters",
+        "raises",
+        "see also",
+        "notes",
+        "references",
+        "examples",
+        "attributes",
+        "methods",
+    ])
+});
+
+pub(crate) static NUMPY_SECTION_NAMES: Lazy<BTreeSet<&'static str>> = Lazy::new(|| {
+    BTreeSet::from([
+        "Short Summary",
+        "Extended Summary",
+        "Parameters",
+        "Returns",
+        "Yields",
+        "Other Parameters",
+        "Raises",
+        "See Also",
+        "Notes",
+        "References",
+        "Examples",
+        "Attributes",
+        "Methods",
+    ])
+});
--- a/src/docstrings/sections.rs
+++ b/src/docstrings/sections.rs
@@ -0,0 +1,99 @@
+use crate::docstrings::helpers;
+use crate::docstrings::styles::SectionStyle;
+
+#[derive(Debug)]
+pub(crate) struct SectionContext<'a> {
+    pub(crate) section_name: String,
+    pub(crate) previous_line: &'a str,
+    pub(crate) line: &'a str,
+    pub(crate) following_lines: &'a [&'a str],
+    pub(crate) is_last_section: bool,
+    pub(crate) original_index: usize,
+}
+
+fn suspected_as_section(line: &str, style: &SectionStyle) -> bool {
+    style
+        .lowercase_section_names()
+        .contains(&helpers::leading_words(line).to_lowercase().as_str())
+}
+
+/// Check if the suspected context is really a section header.
+fn is_docstring_section(context: &SectionContext) -> bool {
+    let section_name_suffix = context
+        .line
+        .trim()
+        .strip_prefix(&context.section_name)
+        .unwrap()
+        .trim();
+    let this_looks_like_a_section_name =
+        section_name_suffix == ":" || section_name_suffix.is_empty();
+    if !this_looks_like_a_section_name {
+        return false;
+    }
+
+    let prev_line = context.previous_line.trim();
+    let prev_line_ends_with_punctuation = [',', ';', '.', '-', '\\', '/', ']', '}', ')']
+        .into_iter()
+        .any(|char| prev_line.ends_with(char));
+    let prev_line_looks_like_end_of_paragraph =
+        prev_line_ends_with_punctuation || prev_line.is_empty();
+    if !prev_line_looks_like_end_of_paragraph {
+        return false;
+    }
+
+    true
+}
+
+/// Extract all `SectionContext` values from a docstring.
+pub(crate) fn section_contexts<'a>(
+    lines: &'a [&'a str],
+    style: &SectionStyle,
+) -> Vec<SectionContext<'a>> {
+    let suspected_section_indices: Vec<usize> = lines
+        .iter()
+        .enumerate()
+        .filter_map(|(lineno, line)| {
+            if lineno > 0 && suspected_as_section(line, style) {
+                Some(lineno)
+            } else {
+                None
+            }
+        })
+        .collect();
+
+    let mut contexts = vec![];
+    for lineno in suspected_section_indices {
+        let context = SectionContext {
+            section_name: helpers::leading_words(lines[lineno]),
+            previous_line: lines[lineno - 1],
+            line: lines[lineno],
+            following_lines: &lines[lineno + 1..],
+            original_index: lineno,
+            is_last_section: false,
+        };
+        if is_docstring_section(&context) {
+            contexts.push(context);
+        }
+    }
+
+    let mut truncated_contexts = vec![];
+    let mut end: Option<usize> = None;
+    for context in contexts.into_iter().rev() {
+        let next_end = context.original_index;
+        truncated_contexts.push(SectionContext {
+            section_name: context.section_name,
+            previous_line: context.previous_line,
+            line: context.line,
+            following_lines: if let Some(end) = end {
+                &lines[context.original_index + 1..end]
+            } else {
+                context.following_lines
+            },
+            original_index: context.original_index,
+            is_last_section: end.is_none(),
+        });
+        end = Some(next_end);
+    }
+    truncated_contexts.reverse();
+    truncated_contexts
+}
--- a/src/docstrings/styles.rs
+++ b/src/docstrings/styles.rs
@@ -0,0 +1,27 @@
+use std::collections::BTreeSet;
+
+use once_cell::sync::Lazy;
+
+use crate::docstrings::google::{GOOGLE_SECTION_NAMES, LOWERCASE_GOOGLE_SECTION_NAMES};
+use crate::docstrings::numpy::{LOWERCASE_NUMPY_SECTION_NAMES, NUMPY_SECTION_NAMES};
+
+pub(crate) enum SectionStyle {
+    NumPy,
+    Google,
+}
+
+impl SectionStyle {
+    pub(crate) fn section_names(&self) -> &Lazy<BTreeSet<&'static str>> {
+        match self {
+            SectionStyle::NumPy => &NUMPY_SECTION_NAMES,
+            SectionStyle::Google => &GOOGLE_SECTION_NAMES,
+        }
+    }
+
+    pub(crate) fn lowercase_section_names(&self) -> &Lazy<BTreeSet<&'static str>> {
+        match self {
+            SectionStyle::NumPy => &LOWERCASE_NUMPY_SECTION_NAMES,
+            SectionStyle::Google => &LOWERCASE_GOOGLE_SECTION_NAMES,
+        }
+    }
+}
--- a/src/flake8_bugbear/mod.rs
+++ b/src/flake8_bugbear/mod.rs
@@ -0,0 +1 @@
+pub mod plugins;
--- a/src/flake8_bugbear/plugins/assert_false.rs
+++ b/src/flake8_bugbear/plugins/assert_false.rs
@@ -2,8 +2,9 @@ use rustpython_ast::{Constant, Expr, ExprContext, ExprKind, Stmt, StmtKind};

 use crate::ast::types::Range;
 use crate::autofix::fixer;
+use crate::autofix::Fix;
 use crate::check_ast::Checker;
-use crate::checks::{Check, CheckKind, Fix};
+use crate::checks::{Check, CheckKind};
 use crate::code_gen::SourceGenerator;

 fn assertion_error(msg: &Option<Box<Expr>>) -> Stmt {
@@ -47,12 +48,11 @@ pub fn assert_false(checker: &mut Checker, stmt: &Stmt, test: &Expr, msg: &Optio
            let mut generator = SourceGenerator::new();
            if let Ok(()) = generator.unparse_stmt(&assertion_error(msg)) {
                if let Ok(content) = generator.generate() {
-                    check.amend(Fix {
+                    check.amend(Fix::replacement(
                        content,
-                        location: stmt.location,
-                        end_location: stmt.end_location,
-                        applied: false,
-                    })
+                        stmt.location,
+                        stmt.end_location.unwrap(),
+                    ));
                }
            }
        }
--- a/src/flake8_bugbear/plugins/assert_raises_exception.rs
+++ b/src/flake8_bugbear/plugins/assert_raises_exception.rs
@@ -0,0 +1,25 @@
+use rustpython_ast::{ExprKind, Stmt, Withitem};
+
+use crate::ast::helpers::match_name_or_attr;
+use crate::ast::types::Range;
+use crate::check_ast::Checker;
+use crate::checks::{Check, CheckKind};
+
+/// B017
+pub fn assert_raises_exception(checker: &mut Checker, stmt: &Stmt, items: &[Withitem]) {
+    if let Some(item) = items.first() {
+        let item_context = &item.context_expr;
+        if let ExprKind::Call { func, args, .. } = &item_context.node {
+            if match_name_or_attr(func, "assertRaises")
+                && args.len() == 1
+                && match_name_or_attr(args.first().unwrap(), "Exception")
+                && item.optional_vars.is_none()
+            {
+                checker.add_check(Check::new(
+                    CheckKind::NoAssertRaisesException,
+                    Range::from_located(stmt),
+                ));
+            }
+        }
+    }
+}
--- a/src/flake8_bugbear/plugins/duplicate_exceptions.rs
+++ b/src/flake8_bugbear/plugins/duplicate_exceptions.rs
@@ -6,8 +6,9 @@ use rustpython_ast::{Excepthandler, ExcepthandlerKind, Expr, ExprContext, ExprKi
 use crate::ast::helpers;
 use crate::ast::types::{CheckLocator, Range};
 use crate::autofix::fixer;
+use crate::autofix::Fix;
 use crate::check_ast::Checker;
-use crate::checks::{Check, CheckCode, CheckKind, Fix};
+use crate::checks::{Check, CheckCode, CheckKind};
 use crate::code_gen::SourceGenerator;

 fn type_pattern(elts: Vec<&Expr>) -> Expr {
@@ -24,7 +25,7 @@ fn type_pattern(elts: Vec<&Expr>) -> Expr {
 pub fn duplicate_handler_exceptions(
    checker: &mut Checker,
    expr: &Expr,
-    elts: &Vec<Expr>,
+    elts: &[Expr],
 ) -> BTreeSet<String> {
    let mut seen: BTreeSet<String> = Default::default();
    let mut duplicates: BTreeSet<String> = Default::default();
@@ -54,12 +55,11 @@ pub fn duplicate_handler_exceptions(
                let mut generator = SourceGenerator::new();
                if let Ok(()) = generator.unparse_expr(&type_pattern(unique_elts), 0) {
                    if let Ok(content) = generator.generate() {
-                        check.amend(Fix {
+                        check.amend(Fix::replacement(
                            content,
-                            location: expr.location,
-                            end_location: expr.end_location,
-                            applied: false,
-                        })
+                            expr.location,
+                            expr.end_location.unwrap(),
+                        ))
                    }
                }
            }
--- a/src/flake8_bugbear/plugins/mod.rs
+++ b/src/flake8_bugbear/plugins/mod.rs
@@ -0,0 +1,10 @@
+pub use assert_false::assert_false;
+pub use assert_raises_exception::assert_raises_exception;
+pub use duplicate_exceptions::duplicate_exceptions;
+pub use duplicate_exceptions::duplicate_handler_exceptions;
+pub use unary_prefix_increment::unary_prefix_increment;
+
+mod assert_false;
+mod assert_raises_exception;
+mod duplicate_exceptions;
+mod unary_prefix_increment;
--- a/src/flake8_bugbear/plugins/unary_prefix_increment.rs
+++ b/src/flake8_bugbear/plugins/unary_prefix_increment.rs
@@ -0,0 +1,19 @@
+use rustpython_ast::{Expr, ExprKind, Unaryop};
+
+use crate::ast::types::Range;
+use crate::check_ast::Checker;
+use crate::checks::{Check, CheckKind};
+
+/// B002
+pub fn unary_prefix_increment(checker: &mut Checker, expr: &Expr, op: &Unaryop, operand: &Expr) {
+    if matches!(op, Unaryop::UAdd) {
+        if let ExprKind::UnaryOp { op, .. } = &operand.node {
+            if matches!(op, Unaryop::UAdd) {
+                checker.add_check(Check::new(
+                    CheckKind::UnaryPrefixIncrement,
+                    Range::from_located(expr),
+                ))
+            }
+        }
+    }
+}
--- a/src/flake8_builtins/checks.rs
+++ b/src/flake8_builtins/checks.rs
@@ -0,0 +1,20 @@
+use crate::ast::types::Range;
+use crate::checks::{Check, CheckKind};
+use crate::flake8_builtins::types::ShadowingType;
+use crate::python::builtins::BUILTINS;
+
+/// Check builtin name shadowing.
+pub fn builtin_shadowing(name: &str, location: Range, node_type: ShadowingType) -> Option<Check> {
+    if BUILTINS.contains(&name) {
+        Some(Check::new(
+            match node_type {
+                ShadowingType::Variable => CheckKind::BuiltinVariableShadowing(name.to_string()),
+                ShadowingType::Argument => CheckKind::BuiltinArgumentShadowing(name.to_string()),
+                ShadowingType::Attribute => CheckKind::BuiltinAttributeShadowing(name.to_string()),
+            },
+            location,
+        ))
+    } else {
+        None
+    }
+}
--- a/src/flake8_builtins/mod.rs
+++ b/src/flake8_builtins/mod.rs
@@ -0,0 +1,2 @@
+pub mod checks;
+pub mod types;
--- a/src/flake8_builtins/types.rs
+++ b/src/flake8_builtins/types.rs
@@ -0,0 +1,5 @@
+pub enum ShadowingType {
+    Variable,
+    Argument,
+    Attribute,
+}
--- a/src/flake8_comprehensions/checks.rs
+++ b/src/flake8_comprehensions/checks.rs
@@ -0,0 +1,378 @@
+use num_bigint::BigInt;
+use rustpython_ast::{Comprehension, Constant, Expr, ExprKind, KeywordData, Located, Unaryop};
+
+use crate::ast::types::Range;
+use crate::checks::{Check, CheckKind};
+
+fn function_name(func: &Expr) -> Option<&str> {
+    if let ExprKind::Name { id, .. } = &func.node {
+        Some(id)
+    } else {
+        None
+    }
+}
+
+fn exactly_one_argument_with_matching_function<'a>(
+    name: &str,
+    func: &Expr,
+    args: &'a [Expr],
+) -> Option<&'a ExprKind> {
+    if args.len() != 1 {
+        return None;
+    }
+    if function_name(func)? != name {
+        return None;
+    }
+    Some(&args[0].node)
+}
+
+fn first_argument_with_matching_function<'a>(
+    name: &str,
+    func: &Expr,
+    args: &'a [Expr],
+) -> Option<&'a ExprKind> {
+    if function_name(func)? != name {
+        return None;
+    }
+    Some(&args.first()?.node)
+}
+
+/// Check `list(generator)` compliance.
+pub fn unnecessary_generator_list(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("list", func, args)?;
+    if let ExprKind::GeneratorExp { .. } = argument {
+        return Some(Check::new(
+            CheckKind::UnnecessaryGeneratorList,
+            Range::from_located(expr),
+        ));
+    }
+    None
+}
+
+/// Check `set(generator)` compliance.
+pub fn unnecessary_generator_set(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("set", func, args)?;
+    if let ExprKind::GeneratorExp { .. } = argument {
+        return Some(Check::new(
+            CheckKind::UnnecessaryGeneratorSet,
+            Range::from_located(expr),
+        ));
+    }
+    None
+}
+
+/// Check `dict((x, y) for x, y in iterable)` compliance.
+pub fn unnecessary_generator_dict(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("dict", func, args)?;
+    if let ExprKind::GeneratorExp { elt, .. } = argument {
+        match &elt.node {
+            ExprKind::Tuple { elts, .. } if elts.len() == 2 => {
+                return Some(Check::new(
+                    CheckKind::UnnecessaryGeneratorDict,
+                    Range::from_located(expr),
+                ));
+            }
+            _ => {}
+        }
+    }
+    None
+}
+
+/// Check `set([...])` compliance.
+pub fn unnecessary_list_comprehension_set(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("set", func, args)?;
+    if let ExprKind::ListComp { .. } = &argument {
+        return Some(Check::new(
+            CheckKind::UnnecessaryListComprehensionSet,
+            Range::from_located(expr),
+        ));
+    }
+    None
+}
+
+/// Check `dict([...])` compliance.
+pub fn unnecessary_list_comprehension_dict(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("dict", func, args)?;
+    if let ExprKind::ListComp { elt, .. } = &argument {
+        match &elt.node {
+            ExprKind::Tuple { elts, .. } if elts.len() == 2 => {
+                return Some(Check::new(
+                    CheckKind::UnnecessaryListComprehensionDict,
+                    Range::from_located(expr),
+                ));
+            }
+            _ => {}
+        }
+    }
+    None
+}
+
+/// Check `set([1, 2])` compliance.
+pub fn unnecessary_literal_set(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("set", func, args)?;
+    let kind = match argument {
+        ExprKind::List { .. } => "list",
+        ExprKind::Tuple { .. } => "tuple",
+        _ => return None,
+    };
+    Some(Check::new(
+        CheckKind::UnnecessaryLiteralSet(kind.to_string()),
+        Range::from_located(expr),
+    ))
+}
+
+/// Check `dict([(1, 2)])` compliance.
+pub fn unnecessary_literal_dict(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let argument = exactly_one_argument_with_matching_function("dict", func, args)?;
+    let (kind, elts) = match argument {
+        ExprKind::Tuple { elts, .. } => ("tuple", elts),
+        ExprKind::List { elts, .. } => ("list", elts),
+        _ => return None,
+    };
+
+    if let Some(elt) = elts.first() {
+        // dict((1, 2), ...)) or dict([(1, 2), ...])
+        if !matches!(&elt.node, ExprKind::Tuple { elts, .. } if elts.len() == 2) {
+            return None;
+        }
+    }
+
+    Some(Check::new(
+        CheckKind::UnnecessaryLiteralDict(kind.to_string()),
+        Range::from_located(expr),
+    ))
+}
+
+pub fn unnecessary_collection_call(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+    keywords: &[Located<KeywordData>],
+) -> Option<Check> {
+    if !args.is_empty() {
+        return None;
+    }
+    let id = function_name(func)?;
+    match id {
+        "list" | "tuple" => {
+            // list() or tuple()
+        }
+        "dict" if keywords.is_empty() || keywords.iter().all(|kw| kw.node.arg.is_some()) => (),
+        _ => return None,
+    };
+    Some(Check::new(
+        CheckKind::UnnecessaryCollectionCall(id.to_string()),
+        Range::from_located(expr),
+    ))
+}
+
+pub fn unnecessary_literal_within_tuple_call(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+) -> Option<Check> {
+    let argument = first_argument_with_matching_function("tuple", func, args)?;
+    let argument_kind = match argument {
+        ExprKind::Tuple { .. } => "tuple",
+        ExprKind::List { .. } => "list",
+        _ => return None,
+    };
+    Some(Check::new(
+        CheckKind::UnnecessaryLiteralWithinTupleCall(argument_kind.to_string()),
+        Range::from_located(expr),
+    ))
+}
+
+pub fn unnecessary_literal_within_list_call(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+) -> Option<Check> {
+    let argument = first_argument_with_matching_function("list", func, args)?;
+    let argument_kind = match argument {
+        ExprKind::Tuple { .. } => "tuple",
+        ExprKind::List { .. } => "list",
+        _ => return None,
+    };
+    Some(Check::new(
+        CheckKind::UnnecessaryLiteralWithinListCall(argument_kind.to_string()),
+        Range::from_located(expr),
+    ))
+}
+
+pub fn unnecessary_list_call(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let argument = first_argument_with_matching_function("list", func, args)?;
+    if let ExprKind::ListComp { .. } = argument {
+        return Some(Check::new(
+            CheckKind::UnnecessaryListCall,
+            Range::from_located(expr),
+        ));
+    }
+    None
+}
+
+pub fn unnecessary_call_around_sorted(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let outer = function_name(func)?;
+    if !(outer == "list" || outer == "reversed") {
+        return None;
+    }
+    if let ExprKind::Call { func, .. } = &args.first()?.node {
+        if function_name(func)? == "sorted" {
+            return Some(Check::new(
+                CheckKind::UnnecessaryCallAroundSorted(outer.to_string()),
+                Range::from_located(expr),
+            ));
+        }
+    }
+    None
+}
+
+pub fn unnecessary_double_cast_or_process(
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+) -> Option<Check> {
+    let outer = function_name(func)?;
+    if !["list", "tuple", "set", "reversed", "sorted"].contains(&outer) {
+        return None;
+    }
+
+    fn new_check(inner: &str, outer: &str, expr: &Expr) -> Check {
+        Check::new(
+            CheckKind::UnnecessaryDoubleCastOrProcess(inner.to_string(), outer.to_string()),
+            Range::from_located(expr),
+        )
+    }
+
+    if let ExprKind::Call { func, .. } = &args.first()?.node {
+        let inner = function_name(func)?;
+        // Ex) set(tuple(...))
+        if (outer == "set" || outer == "sorted")
+            && (inner == "list" || inner == "tuple" || inner == "reversed" || inner == "sorted")
+        {
+            return Some(new_check(inner, outer, expr));
+        }
+
+        // Ex) list(tuple(...))
+        if (outer == "list" || outer == "tuple") && (inner == "list" || inner == "tuple") {
+            return Some(new_check(inner, outer, expr));
+        }
+
+        // Ex) set(set(...))
+        if outer == "set" && inner == "set" {
+            return Some(new_check(inner, outer, expr));
+        }
+    }
+    None
+}
+
+pub fn unnecessary_subscript_reversal(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    let first_arg = args.first()?;
+    let id = function_name(func)?;
+    if !["set", "sorted", "reversed"].contains(&id) {
+        return None;
+    }
+    if let ExprKind::Subscript { slice, .. } = &first_arg.node {
+        if let ExprKind::Slice { lower, upper, step } = &slice.node {
+            if lower.is_none() && upper.is_none() {
+                if let Some(step) = step {
+                    if let ExprKind::UnaryOp {
+                        op: Unaryop::USub,
+                        operand,
+                    } = &step.node
+                    {
+                        if let ExprKind::Constant {
+                            value: Constant::Int(val),
+                            ..
+                        } = &operand.node
+                        {
+                            if *val == BigInt::from(1) {
+                                return Some(Check::new(
+                                    CheckKind::UnnecessarySubscriptReversal(id.to_string()),
+                                    Range::from_located(expr),
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    None
+}
+
+pub fn unnecessary_comprehension(
+    expr: &Expr,
+    elt: &Expr,
+    generators: &[Comprehension],
+) -> Option<Check> {
+    if generators.len() != 1 {
+        return None;
+    }
+    let generator = &generators[0];
+    if !(generator.ifs.is_empty() && generator.is_async == 0) {
+        return None;
+    }
+    let elt_id = function_name(elt)?;
+    let target_id = function_name(&generator.target)?;
+    if elt_id != target_id {
+        return None;
+    }
+    let expr_kind = match &expr.node {
+        ExprKind::ListComp { .. } => "list",
+        ExprKind::SetComp { .. } => "set",
+        _ => return None,
+    };
+    Some(Check::new(
+        CheckKind::UnnecessaryComprehension(expr_kind.to_string()),
+        Range::from_located(expr),
+    ))
+}
+
+pub fn unnecessary_map(expr: &Expr, func: &Expr, args: &[Expr]) -> Option<Check> {
+    fn new_check(kind: &str, expr: &Expr) -> Check {
+        Check::new(
+            CheckKind::UnnecessaryMap(kind.to_string()),
+            Range::from_located(expr),
+        )
+    }
+    let id = function_name(func)?;
+    match id {
+        "map" => {
+            if args.len() == 2 && matches!(&args[0].node, ExprKind::Lambda { .. }) {
+                return Some(new_check("generator", expr));
+            }
+        }
+        "list" | "set" => {
+            if let ExprKind::Call { func, args, .. } = &args.first()?.node {
+                let argument = first_argument_with_matching_function("map", func, args)?;
+                if let ExprKind::Lambda { .. } = argument {
+                    return Some(new_check(id, expr));
+                }
+            }
+        }
+        "dict" => {
+            if args.len() == 1 {
+                if let ExprKind::Call { func, args, .. } = &args[0].node {
+                    let argument = first_argument_with_matching_function("map", func, args)?;
+                    if let ExprKind::Lambda { body, .. } = &argument {
+                        if matches!(&body.node, ExprKind::Tuple { elts, .. } | ExprKind::List { elts, .. } if elts.len() == 2)
+                        {
+                            return Some(new_check(id, expr));
+                        }
+                    }
+                }
+            }
+        }
+        _ => (),
+    }
+    None
+}
--- a/src/flake8_comprehensions/mod.rs
+++ b/src/flake8_comprehensions/mod.rs
@@ -0,0 +1 @@
+pub mod checks;
--- a/src/flake8_print/checks.rs
+++ b/src/flake8_print/checks.rs
@@ -0,0 +1,36 @@
+use rustpython_ast::{Expr, ExprKind};
+
+use crate::ast::types::Range;
+use crate::checks::{Check, CheckKind};
+
+/// Check whether a function call is a `print` or `pprint` invocation
+pub fn print_call(
+    expr: &Expr,
+    func: &Expr,
+    check_print: bool,
+    check_pprint: bool,
+) -> Option<Check> {
+    if let ExprKind::Name { id, .. } = &func.node {
+        if check_print && id == "print" {
+            return Some(Check::new(CheckKind::PrintFound, Range::from_located(expr)));
+        } else if check_pprint && id == "pprint" {
+            return Some(Check::new(
+                CheckKind::PPrintFound,
+                Range::from_located(expr),
+            ));
+        }
+    }
+
+    if let ExprKind::Attribute { value, attr, .. } = &func.node {
+        if let ExprKind::Name { id, .. } = &value.node {
+            if check_pprint && id == "pprint" && attr == "pprint" {
+                return Some(Check::new(
+                    CheckKind::PPrintFound,
+                    Range::from_located(expr),
+                ));
+            }
+        }
+    }
+
+    None
+}
--- a/src/flake8_print/mod.rs
+++ b/src/flake8_print/mod.rs
@@ -0,0 +1,2 @@
+mod checks;
+pub mod plugins;
--- a/src/flake8_print/plugins/mod.rs
+++ b/src/flake8_print/plugins/mod.rs
@@ -0,0 +1,3 @@
+pub use print_call::print_call;
+
+mod print_call;
--- a/src/flake8_print/plugins/print_call.rs
+++ b/src/flake8_print/plugins/print_call.rs
@@ -1,13 +1,13 @@
 use log::error;
 use rustpython_ast::{Expr, Stmt, StmtKind};

-use crate::ast::checkers;
-use crate::autofix::{fixer, fixes};
+use crate::autofix::{fixer, helpers};
 use crate::check_ast::Checker;
 use crate::checks::CheckCode;
+use crate::flake8_print::checks;

 pub fn print_call(checker: &mut Checker, expr: &Expr, func: &Expr) {
-    if let Some(mut check) = checkers::print_call(
+    if let Some(mut check) = checks::print_call(
        expr,
        func,
        checker.settings.enabled.contains(&CheckCode::T201),
@@ -25,13 +25,13 @@ pub fn print_call(checker: &mut Checker, expr: &Expr, func: &Expr) {
                    .map(|index| checker.parents[*index])
                    .collect();

-                match fixes::remove_stmt(
+                match helpers::remove_stmt(
                    checker.parents[context.defined_by],
                    context.defined_in.map(|index| checker.parents[index]),
                    &deleted,
                ) {
                    Ok(fix) => {
-                        if fix.content.is_empty() || fix.content == "pass" {
+                        if fix.patch.content.is_empty() || fix.patch.content == "pass" {
                            checker.deletions.insert(context.defined_by);
                        }
                        check.amend(fix)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::collapsible_if, clippy::collapsible_else_if)]
+
 use std::path::Path;

 use anyhow::Result;
@@ -17,16 +19,24 @@ mod check_lines;
 pub mod checks;
 pub mod cli;
 pub mod code_gen;
-pub mod docstrings;
+mod docstrings;
+mod flake8_bugbear;
+mod flake8_builtins;
+mod flake8_comprehensions;
+mod flake8_print;
 pub mod fs;
 pub mod linter;
 pub mod logging;
 pub mod message;
 mod noqa;
-mod plugins;
+mod pep8_naming;
 pub mod printer;
+mod pycodestyle;
+mod pydocstyle;
+mod pyflakes;
 pub mod pyproject;
 mod python;
+mod pyupgrade;
 pub mod settings;
 pub mod visibility;

--- a/src/linter.rs
+++ b/src/linter.rs
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,9 +9,11 @@ use clap::Parser;
 use colored::Colorize;
 use log::{debug, error};
 use notify::{raw_watcher, RecursiveMode, Watcher};
+#[cfg(not(target_family = "wasm"))]
 use rayon::prelude::*;
 use walkdir::DirEntry;

+#[cfg(not(target_family = "wasm"))]
 use ruff::cache;
 use ruff::checks::CheckCode;
 use ruff::checks::CheckKind;
@@ -29,9 +31,24 @@ use ruff::settings::RawSettings;
 use ruff::settings::{FilePattern, PerFileIgnore, Settings};
 use ruff::tell_user;

+#[cfg(feature = "update-informer")]
 const CARGO_PKG_NAME: &str = env!("CARGO_PKG_NAME");
+#[cfg(feature = "update-informer")]
 const CARGO_PKG_VERSION: &str = env!("CARGO_PKG_VERSION");

+/// Shim that calls par_iter except for wasm because there's no wasm support in rayon yet
+/// (there is a shim to be used for the web, but it requires js cooperation)
+/// Unfortunately, ParallelIterator does not implement Iterator so the signatures diverge
+#[cfg(not(target_family = "wasm"))]
+fn par_iter<T: Sync>(iterable: &Vec<T>) -> impl ParallelIterator<Item = &T> {
+    iterable.par_iter()
+}
+
+#[cfg(target_family = "wasm")]
+fn par_iter<T: Sync>(iterable: &Vec<T>) -> impl Iterator<Item = &T> {
+    iterable.iter()
+}
+
 #[cfg(feature = "update-informer")]
 fn check_for_updates() {
    use update_informer::{registry, Check};
@@ -81,9 +98,9 @@ fn read_from_stdin() -> Result<String> {
    Ok(buffer)
 }

-fn run_once_stdin(settings: &Settings, filename: &Path) -> Result<Vec<Message>> {
+fn run_once_stdin(settings: &Settings, filename: &Path, autofix: bool) -> Result<Vec<Message>> {
    let stdin = read_from_stdin()?;
-    let mut messages = lint_stdin(filename, &stdin, settings)?;
+    let mut messages = lint_stdin(filename, &stdin, settings, &autofix.into())?;
    messages.sort_unstable();
    Ok(messages)
 }
@@ -104,8 +121,7 @@ fn run_once(
    debug!("Identified files to lint in: {:?}", duration);

    let start = Instant::now();
-    let mut messages: Vec<Message> = paths
-        .par_iter()
+    let mut messages: Vec<Message> = par_iter(&paths)
        .map(|entry| {
            match entry {
                Ok(entry) => {
@@ -160,8 +176,7 @@ fn add_noqa(files: &[PathBuf], settings: &Settings) -> Result<usize> {
    debug!("Identified files to lint in: {:?}", duration);

    let start = Instant::now();
-    let modifications: usize = paths
-        .par_iter()
+    let modifications: usize = par_iter(&paths)
        .map(|entry| match entry {
            Ok(entry) => {
                let path = entry.path();
@@ -190,8 +205,7 @@ fn autoformat(files: &[PathBuf], settings: &Settings) -> Result<usize> {
    debug!("Identified files to lint in: {:?}", duration);

    let start = Instant::now();
-    let modifications = paths
-        .par_iter()
+    let modifications = par_iter(&paths)
        .map(|entry| {
            let path = entry.path();
            autoformat_path(path)
@@ -216,7 +230,9 @@ fn inner_main() -> Result<ExitCode> {
        Some(path) => debug!("Found project root at: {:?}", path),
        None => debug!("Unable to identify project root; assuming current directory..."),
    };
-    let pyproject = pyproject::find_pyproject_toml(&project_root);
+    let pyproject = cli
+        .config
+        .or_else(|| pyproject::find_pyproject_toml(&project_root));
    match &pyproject {
        Some(path) => debug!("Found pyproject.toml at: {:?}", path),
        None => debug!("Unable to find pyproject.toml; using default settings..."),
@@ -300,6 +316,7 @@ fn inner_main() -> Result<ExitCode> {
        return Ok(ExitCode::SUCCESS);
    }

+    #[cfg(not(target_family = "wasm"))]
    cache::init()?;

    let mut printer = Printer::new(cli.format, cli.verbose);
@@ -365,23 +382,30 @@ fn inner_main() -> Result<ExitCode> {
            println!("Formatted {modifications} files.");
        }
    } else {
-        let messages = if cli.files == vec![PathBuf::from("-")] {
-            if cli.fix {
-                eprintln!("Warning: --fix is not enabled when reading from stdin.");
-            }
-
-            let filename = cli.stdin_filename.unwrap_or_else(|| "-".to_string());
-            let path = Path::new(&filename);
-            run_once_stdin(&settings, path)?
-        } else {
-            run_once(&cli.files, &settings, !cli.no_cache, cli.fix)?
-        };
-        if !cli.quiet {
+        let (messages, should_print_messages, should_check_updates) =
+            if cli.files == vec![PathBuf::from("-")] {
+                let filename = cli.stdin_filename.unwrap_or_else(|| "-".to_string());
+                let path = Path::new(&filename);
+                (
+                    run_once_stdin(&settings, path, cli.fix)?,
+                    !cli.quiet && !cli.fix,
+                    false,
+                )
+            } else {
+                (
+                    run_once(&cli.files, &settings, !cli.no_cache, cli.fix)?,
+                    !cli.quiet,
+                    !cli.quiet,
+                )
+            };
+        if should_print_messages {
            printer.write_once(&messages)?;
        }

        #[cfg(feature = "update-informer")]
-        check_for_updates();
+        if should_check_updates {
+            check_for_updates();
+        }

        if messages.iter().any(|message| !message.fixed) && !cli.exit_zero {
            return Ok(ExitCode::FAILURE);
--- a/src/noqa.rs
+++ b/src/noqa.rs
@@ -81,7 +81,7 @@ pub fn extract_noqa_line_for(lxr: &[LexResult]) -> Vec<usize> {
 }

 fn add_noqa_inner(
-    checks: &Vec<Check>,
+    checks: &[Check],
    contents: &str,
    noqa_line_for: &[usize],
 ) -> Result<(usize, String)> {
@@ -138,7 +138,7 @@ fn add_noqa_inner(
 }

 pub fn add_noqa(
-    checks: &Vec<Check>,
+    checks: &[Check],
    contents: &str,
    noqa_line_for: &[usize],
    path: &Path,
--- a/src/pep8_naming/checks.rs
+++ b/src/pep8_naming/checks.rs
@@ -0,0 +1,261 @@
+use itertools::Itertools;
+use rustpython_ast::{Arguments, Expr, ExprKind, Stmt};
+
+use crate::ast::types::{Range, Scope, ScopeKind};
+use crate::checks::{Check, CheckKind};
+
+pub fn invalid_class_name(class_def: &Stmt, name: &str) -> Option<Check> {
+    let stripped = name.strip_prefix('_').unwrap_or(name);
+    if !stripped
+        .chars()
+        .next()
+        .map(|c| c.is_uppercase())
+        .unwrap_or(false)
+        || stripped.contains('_')
+    {
+        return Some(Check::new(
+            CheckKind::InvalidClassName(name.to_string()),
+            Range::from_located(class_def),
+        ));
+    }
+    None
+}
+
+pub fn invalid_function_name(func_def: &Stmt, name: &str) -> Option<Check> {
+    if name.chars().any(|c| c.is_uppercase()) {
+        return Some(Check::new(
+            CheckKind::InvalidFunctionName(name.to_string()),
+            Range::from_located(func_def),
+        ));
+    }
+    None
+}
+
+pub fn invalid_argument_name(location: Range, name: &str) -> Option<Check> {
+    if name.chars().any(|c| c.is_uppercase()) {
+        return Some(Check::new(
+            CheckKind::InvalidArgumentName(name.to_string()),
+            location,
+        ));
+    }
+    None
+}
+
+pub fn invalid_first_argument_name_for_class_method(
+    scope: &Scope,
+    decorator_list: &[Expr],
+    args: &Arguments,
+) -> Option<Check> {
+    if !matches!(scope.kind, ScopeKind::Class) {
+        return None;
+    }
+
+    if decorator_list.iter().any(|decorator| {
+        if let ExprKind::Name { id, .. } = &decorator.node {
+            id == "classmethod"
+        } else {
+            false
+        }
+    }) {
+        if let Some(arg) = args.args.first() {
+            if arg.node.arg != "cls" {
+                return Some(Check::new(
+                    CheckKind::InvalidFirstArgumentNameForClassMethod,
+                    Range::from_located(arg),
+                ));
+            }
+        }
+    }
+    None
+}
+
+pub fn invalid_first_argument_name_for_method(
+    scope: &Scope,
+    decorator_list: &[Expr],
+    args: &Arguments,
+) -> Option<Check> {
+    if !matches!(scope.kind, ScopeKind::Class) {
+        return None;
+    }
+
+    if decorator_list.iter().any(|decorator| {
+        if let ExprKind::Name { id, .. } = &decorator.node {
+            id == "classmethod" || id == "staticmethod"
+        } else {
+            false
+        }
+    }) {
+        return None;
+    }
+
+    if let Some(arg) = args.args.first() {
+        if arg.node.arg != "self" {
+            return Some(Check::new(
+                CheckKind::InvalidFirstArgumentNameForMethod,
+                Range::from_located(arg),
+            ));
+        }
+    }
+    None
+}
+
+pub fn dunder_function_name(func_def: &Stmt, scope: &Scope, name: &str) -> Option<Check> {
+    if matches!(scope.kind, ScopeKind::Class) {
+        return None;
+    }
+
+    if name.starts_with("__") && name.ends_with("__") {
+        return Some(Check::new(
+            CheckKind::DunderFunctionName,
+            Range::from_located(func_def),
+        ));
+    }
+
+    None
+}
+
+fn is_lower(s: &str) -> bool {
+    let mut cased = false;
+    for c in s.chars() {
+        if c.is_uppercase() {
+            return false;
+        } else if !cased && c.is_lowercase() {
+            cased = true;
+        }
+    }
+    cased
+}
+
+fn is_upper(s: &str) -> bool {
+    let mut cased = false;
+    for c in s.chars() {
+        if c.is_lowercase() {
+            return false;
+        } else if (!cased) && c.is_uppercase() {
+            cased = true;
+        }
+    }
+    cased
+}
+
+pub fn constant_imported_as_non_constant(
+    import_from: &Stmt,
+    name: &str,
+    asname: &str,
+) -> Option<Check> {
+    if is_upper(name) && !is_upper(asname) {
+        return Some(Check::new(
+            CheckKind::ConstantImportedAsNonConstant(name.to_string(), asname.to_string()),
+            Range::from_located(import_from),
+        ));
+    }
+    None
+}
+
+pub fn lowercase_imported_as_non_lowercase(
+    import_from: &Stmt,
+    name: &str,
+    asname: &str,
+) -> Option<Check> {
+    if is_lower(name) && asname.to_lowercase() != asname {
+        return Some(Check::new(
+            CheckKind::LowercaseImportedAsNonLowercase(name.to_string(), asname.to_string()),
+            Range::from_located(import_from),
+        ));
+    }
+    None
+}
+
+fn is_camelcase(name: &str) -> bool {
+    !is_lower(name) && !is_upper(name) && !name.contains('_')
+}
+fn is_acronym(name: &str, asname: &str) -> bool {
+    name.chars().filter(|c| c.is_uppercase()).join("") == asname
+}
+
+pub fn camelcase_imported_as_lowercase(
+    import_from: &Stmt,
+    name: &str,
+    asname: &str,
+) -> Option<Check> {
+    if is_camelcase(name) && is_lower(asname) {
+        return Some(Check::new(
+            CheckKind::CamelcaseImportedAsLowercase(name.to_string(), asname.to_string()),
+            Range::from_located(import_from),
+        ));
+    }
+    None
+}
+
+pub fn camelcase_imported_as_constant(
+    import_from: &Stmt,
+    name: &str,
+    asname: &str,
+) -> Option<Check> {
+    if is_camelcase(name) && is_upper(asname) && !is_acronym(name, asname) {
+        return Some(Check::new(
+            CheckKind::CamelcaseImportedAsConstant(name.to_string(), asname.to_string()),
+            Range::from_located(import_from),
+        ));
+    }
+    None
+}
+
+pub fn camelcase_imported_as_acronym(
+    import_from: &Stmt,
+    name: &str,
+    asname: &str,
+) -> Option<Check> {
+    if is_camelcase(name) && is_upper(asname) && is_acronym(name, asname) {
+        return Some(Check::new(
+            CheckKind::CamelcaseImportedAsAcronym(name.to_string(), asname.to_string()),
+            Range::from_located(import_from),
+        ));
+    }
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{is_acronym, is_camelcase, is_lower, is_upper};
+
+    #[test]
+    fn test_is_lower() -> () {
+        assert!(is_lower("abc"));
+        assert!(is_lower("a_b_c"));
+        assert!(is_lower("a2c"));
+        assert!(!is_lower("aBc"));
+        assert!(!is_lower("ABC"));
+        assert!(!is_lower(""));
+        assert!(!is_lower("_"));
+    }
+
+    #[test]
+    fn test_is_upper() -> () {
+        assert!(is_upper("ABC"));
+        assert!(is_upper("A_B_C"));
+        assert!(is_upper("A2C"));
+        assert!(!is_upper("aBc"));
+        assert!(!is_upper("abc"));
+        assert!(!is_upper(""));
+        assert!(!is_upper("_"));
+    }
+
+    #[test]
+    fn test_is_camelcase() -> () {
+        assert!(is_camelcase("Camel"));
+        assert!(is_camelcase("CamelCase"));
+        assert!(!is_camelcase("camel"));
+        assert!(!is_camelcase("camel_case"));
+        assert!(!is_camelcase("CAMEL"));
+        assert!(!is_camelcase("CAMEL_CASE"));
+    }
+
+    #[test]
+    fn test_is_acronym() -> () {
+        assert!(is_acronym("AB", "AB"));
+        assert!(is_acronym("AbcDef", "AD"));
+        assert!(!is_acronym("AbcDef", "Ad"));
+        assert!(!is_acronym("AbcDef", "AB"));
+    }
+}
--- a/src/pep8_naming/mod.rs
+++ b/src/pep8_naming/mod.rs
@@ -0,0 +1 @@
+pub mod checks;
--- a/src/plugins/unnecessary_abspath.rs
+++ b/src/plugins/unnecessary_abspath.rs
@@ -1,23 +0,0 @@
-use rustpython_ast::Expr;
-
-use crate::ast::checkers;
-use crate::ast::types::{CheckLocator, Range};
-use crate::autofix::fixer;
-use crate::check_ast::Checker;
-use crate::checks::Fix;
-
-pub fn unnecessary_abspath(checker: &mut Checker, expr: &Expr, func: &Expr, args: &Vec<Expr>) {
-    if let Some(mut check) =
-        checkers::unnecessary_abspath(func, args, checker.locate_check(Range::from_located(expr)))
-    {
-        if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
-            check.amend(Fix {
-                content: "__file__".to_string(),
-                location: expr.location,
-                end_location: expr.end_location,
-                applied: false,
-            });
-        }
-        checker.add_check(check);
-    }
-}
--- a/src/printer.rs
+++ b/src/printer.rs
@@ -50,14 +50,14 @@ impl Printer {
                    serde_json::to_string_pretty(
                        &messages
                            .iter()
-                            .map(|m| ExpandedMessage {
-                                kind: &m.kind,
-                                code: m.kind.code(),
-                                message: m.kind.body(),
-                                fixed: m.fixed,
-                                location: m.location,
-                                end_location: m.end_location,
-                                filename: &m.filename,
+                            .map(|message| ExpandedMessage {
+                                kind: &message.kind,
+                                code: message.kind.code(),
+                                message: message.kind.body(),
+                                fixed: message.fixed,
+                                location: message.location,
+                                end_location: message.end_location,
+                                filename: &message.filename,
                            })
                            .collect::<Vec<_>>()
                    )?
@@ -104,6 +104,7 @@ impl Printer {
    }

    pub fn clear_screen(&mut self) -> Result<()> {
+        #[cfg(not(target_family = "wasm"))]
        clearscreen::clear()?;
        Ok(())
    }
--- a/src/pycodestyle/checks.rs
+++ b/src/pycodestyle/checks.rs
@@ -0,0 +1,238 @@
+use itertools::izip;
+use rustpython_parser::ast::{Cmpop, Constant, Expr, ExprKind, Unaryop};
+
+use crate::ast::types::{CheckLocator, Range};
+use crate::checks::{Check, CheckKind, RejectedCmpop};
+
+fn is_ambiguous_name(name: &str) -> bool {
+    name == "l" || name == "I" || name == "O"
+}
+
+/// Check AmbiguousVariableName compliance.
+pub fn ambiguous_variable_name(name: &str, location: Range) -> Option<Check> {
+    if is_ambiguous_name(name) {
+        Some(Check::new(
+            CheckKind::AmbiguousVariableName(name.to_string()),
+            location,
+        ))
+    } else {
+        None
+    }
+}
+
+/// Check AmbiguousClassName compliance.
+pub fn ambiguous_class_name(name: &str, location: Range) -> Option<Check> {
+    if is_ambiguous_name(name) {
+        Some(Check::new(
+            CheckKind::AmbiguousClassName(name.to_string()),
+            location,
+        ))
+    } else {
+        None
+    }
+}
+
+/// Check AmbiguousFunctionName compliance.
+pub fn ambiguous_function_name(name: &str, location: Range) -> Option<Check> {
+    if is_ambiguous_name(name) {
+        Some(Check::new(
+            CheckKind::AmbiguousFunctionName(name.to_string()),
+            location,
+        ))
+    } else {
+        None
+    }
+}
+
+/// Check DoNotAssignLambda compliance.
+pub fn do_not_assign_lambda(value: &Expr, location: Range) -> Option<Check> {
+    if let ExprKind::Lambda { .. } = &value.node {
+        Some(Check::new(CheckKind::DoNotAssignLambda, location))
+    } else {
+        None
+    }
+}
+
+/// Check NotInTest and NotIsTest compliance.
+pub fn not_tests(
+    op: &Unaryop,
+    operand: &Expr,
+    check_not_in: bool,
+    check_not_is: bool,
+    locator: &dyn CheckLocator,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    if matches!(op, Unaryop::Not) {
+        if let ExprKind::Compare { ops, .. } = &operand.node {
+            for op in ops {
+                match op {
+                    Cmpop::In => {
+                        if check_not_in {
+                            checks.push(Check::new(
+                                CheckKind::NotInTest,
+                                locator.locate_check(Range::from_located(operand)),
+                            ));
+                        }
+                    }
+                    Cmpop::Is => {
+                        if check_not_is {
+                            checks.push(Check::new(
+                                CheckKind::NotIsTest,
+                                locator.locate_check(Range::from_located(operand)),
+                            ));
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        }
+    }
+
+    checks
+}
+
+/// Check TrueFalseComparison and NoneComparison compliance.
+pub fn literal_comparisons(
+    left: &Expr,
+    ops: &[Cmpop],
+    comparators: &[Expr],
+    check_none_comparisons: bool,
+    check_true_false_comparisons: bool,
+    locator: &dyn CheckLocator,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    let op = ops.first().unwrap();
+    let comparator = left;
+
+    // Check `left`.
+    if check_none_comparisons
+        && matches!(
+            comparator.node,
+            ExprKind::Constant {
+                value: Constant::None,
+                kind: None
+            }
+        )
+    {
+        if matches!(op, Cmpop::Eq) {
+            checks.push(Check::new(
+                CheckKind::NoneComparison(RejectedCmpop::Eq),
+                locator.locate_check(Range::from_located(comparator)),
+            ));
+        }
+        if matches!(op, Cmpop::NotEq) {
+            checks.push(Check::new(
+                CheckKind::NoneComparison(RejectedCmpop::NotEq),
+                locator.locate_check(Range::from_located(comparator)),
+            ));
+        }
+    }
+
+    if check_true_false_comparisons {
+        if let ExprKind::Constant {
+            value: Constant::Bool(value),
+            kind: None,
+        } = comparator.node
+        {
+            if matches!(op, Cmpop::Eq) {
+                checks.push(Check::new(
+                    CheckKind::TrueFalseComparison(value, RejectedCmpop::Eq),
+                    locator.locate_check(Range::from_located(comparator)),
+                ));
+            }
+            if matches!(op, Cmpop::NotEq) {
+                checks.push(Check::new(
+                    CheckKind::TrueFalseComparison(value, RejectedCmpop::NotEq),
+                    locator.locate_check(Range::from_located(comparator)),
+                ));
+            }
+        }
+    }
+
+    // Check each comparator in order.
+    for (op, comparator) in izip!(ops, comparators) {
+        if check_none_comparisons
+            && matches!(
+                comparator.node,
+                ExprKind::Constant {
+                    value: Constant::None,
+                    kind: None
+                }
+            )
+        {
+            if matches!(op, Cmpop::Eq) {
+                checks.push(Check::new(
+                    CheckKind::NoneComparison(RejectedCmpop::Eq),
+                    locator.locate_check(Range::from_located(comparator)),
+                ));
+            }
+            if matches!(op, Cmpop::NotEq) {
+                checks.push(Check::new(
+                    CheckKind::NoneComparison(RejectedCmpop::NotEq),
+                    locator.locate_check(Range::from_located(comparator)),
+                ));
+            }
+        }
+
+        if check_true_false_comparisons {
+            if let ExprKind::Constant {
+                value: Constant::Bool(value),
+                kind: None,
+            } = comparator.node
+            {
+                if matches!(op, Cmpop::Eq) {
+                    checks.push(Check::new(
+                        CheckKind::TrueFalseComparison(value, RejectedCmpop::Eq),
+                        locator.locate_check(Range::from_located(comparator)),
+                    ));
+                }
+                if matches!(op, Cmpop::NotEq) {
+                    checks.push(Check::new(
+                        CheckKind::TrueFalseComparison(value, RejectedCmpop::NotEq),
+                        locator.locate_check(Range::from_located(comparator)),
+                    ));
+                }
+            }
+        }
+    }
+
+    checks
+}
+
+/// Check TypeComparison compliance.
+pub fn type_comparison(ops: &[Cmpop], comparators: &[Expr], location: Range) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    for (op, right) in izip!(ops, comparators) {
+        if matches!(op, Cmpop::Is | Cmpop::IsNot | Cmpop::Eq | Cmpop::NotEq) {
+            match &right.node {
+                ExprKind::Call { func, args, .. } => {
+                    if let ExprKind::Name { id, .. } = &func.node {
+                        // Ex) type(False)
+                        if id == "type" {
+                            if let Some(arg) = args.first() {
+                                // Allow comparison for types which are not obvious.
+                                if !matches!(arg.node, ExprKind::Name { .. }) {
+                                    checks.push(Check::new(CheckKind::TypeComparison, location));
+                                }
+                            }
+                        }
+                    }
+                }
+                ExprKind::Attribute { value, .. } => {
+                    if let ExprKind::Name { id, .. } = &value.node {
+                        // Ex) types.IntType
+                        if id == "types" {
+                            checks.push(Check::new(CheckKind::TypeComparison, location));
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+    }
+
+    checks
+}
--- a/src/pycodestyle/mod.rs
+++ b/src/pycodestyle/mod.rs
@@ -0,0 +1 @@
+pub mod checks;
--- a/src/pydocstyle/mod.rs
+++ b/src/pydocstyle/mod.rs
@@ -0,0 +1 @@
+pub mod plugins;
--- a/src/pydocstyle/plugins.rs
+++ b/src/pydocstyle/plugins.rs
--- a/src/pyflakes/checks.rs
+++ b/src/pyflakes/checks.rs
@@ -0,0 +1,345 @@
+use std::collections::BTreeSet;
+
+use itertools::izip;
+use regex::Regex;
+use rustpython_parser::ast::{
+    Arg, Arguments, Cmpop, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprKind, Stmt,
+    StmtKind,
+};
+
+use crate::ast::types::{BindingKind, CheckLocator, FunctionScope, Range, Scope, ScopeKind};
+use crate::checks::{Check, CheckKind};
+
+/// Check IfTuple compliance.
+pub fn if_tuple(test: &Expr, location: Range) -> Option<Check> {
+    if let ExprKind::Tuple { elts, .. } = &test.node {
+        if !elts.is_empty() {
+            return Some(Check::new(CheckKind::IfTuple, location));
+        }
+    }
+    None
+}
+
+/// Check AssertTuple compliance.
+pub fn assert_tuple(test: &Expr, location: Range) -> Option<Check> {
+    if let ExprKind::Tuple { elts, .. } = &test.node {
+        if !elts.is_empty() {
+            return Some(Check::new(CheckKind::AssertTuple, location));
+        }
+    }
+    None
+}
+
+/// Check UnusedVariable compliance.
+pub fn unused_variables(
+    scope: &Scope,
+    locator: &dyn CheckLocator,
+    dummy_variable_rgx: &Regex,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    if matches!(
+        scope.kind,
+        ScopeKind::Function(FunctionScope { uses_locals: true })
+    ) {
+        return checks;
+    }
+
+    for (name, binding) in scope.values.iter() {
+        if binding.used.is_none()
+            && matches!(binding.kind, BindingKind::Assignment)
+            && !dummy_variable_rgx.is_match(name)
+            && name != "__tracebackhide__"
+            && name != "__traceback_info__"
+            && name != "__traceback_supplement__"
+        {
+            checks.push(Check::new(
+                CheckKind::UnusedVariable(name.to_string()),
+                locator.locate_check(binding.range),
+            ));
+        }
+    }
+
+    checks
+}
+
+/// Check DefaultExceptNotLast compliance.
+pub fn default_except_not_last(handlers: &[Excepthandler]) -> Option<Check> {
+    for (idx, handler) in handlers.iter().enumerate() {
+        let ExcepthandlerKind::ExceptHandler { type_, .. } = &handler.node;
+        if type_.is_none() && idx < handlers.len() - 1 {
+            return Some(Check::new(
+                CheckKind::DefaultExceptNotLast,
+                Range::from_located(handler),
+            ));
+        }
+    }
+
+    None
+}
+
+/// Check RaiseNotImplemented compliance.
+pub fn raise_not_implemented(expr: &Expr) -> Option<Check> {
+    match &expr.node {
+        ExprKind::Call { func, .. } => {
+            if let ExprKind::Name { id, .. } = &func.node {
+                if id == "NotImplemented" {
+                    return Some(Check::new(
+                        CheckKind::RaiseNotImplemented,
+                        Range::from_located(expr),
+                    ));
+                }
+            }
+        }
+        ExprKind::Name { id, .. } => {
+            if id == "NotImplemented" {
+                return Some(Check::new(
+                    CheckKind::RaiseNotImplemented,
+                    Range::from_located(expr),
+                ));
+            }
+        }
+        _ => {}
+    }
+
+    None
+}
+
+/// Check DuplicateArgumentName compliance.
+pub fn duplicate_arguments(arguments: &Arguments) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    // Collect all the arguments into a single vector.
+    let mut all_arguments: Vec<&Arg> = arguments
+        .args
+        .iter()
+        .chain(arguments.posonlyargs.iter())
+        .chain(arguments.kwonlyargs.iter())
+        .collect();
+    if let Some(arg) = &arguments.vararg {
+        all_arguments.push(arg);
+    }
+    if let Some(arg) = &arguments.kwarg {
+        all_arguments.push(arg);
+    }
+
+    // Search for duplicates.
+    let mut idents: BTreeSet<&str> = BTreeSet::new();
+    for arg in all_arguments {
+        let ident = &arg.node.arg;
+        if idents.contains(ident.as_str()) {
+            checks.push(Check::new(
+                CheckKind::DuplicateArgumentName,
+                Range::from_located(arg),
+            ));
+        }
+        idents.insert(ident);
+    }
+
+    checks
+}
+
+#[derive(Debug, PartialEq)]
+enum DictionaryKey<'a> {
+    Constant(&'a Constant),
+    Variable(&'a String),
+}
+
+fn convert_to_value(expr: &Expr) -> Option<DictionaryKey> {
+    match &expr.node {
+        ExprKind::Constant { value, .. } => Some(DictionaryKey::Constant(value)),
+        ExprKind::Name { id, .. } => Some(DictionaryKey::Variable(id)),
+        _ => None,
+    }
+}
+
+/// Check MultiValueRepeatedKeyLiteral and MultiValueRepeatedKeyVariable compliance.
+pub fn repeated_keys(
+    keys: &[Expr],
+    check_repeated_literals: bool,
+    check_repeated_variables: bool,
+    locator: &dyn CheckLocator,
+) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    let num_keys = keys.len();
+    for i in 0..num_keys {
+        let k1 = &keys[i];
+        let v1 = convert_to_value(k1);
+        for k2 in keys.iter().take(num_keys).skip(i + 1) {
+            let v2 = convert_to_value(k2);
+            match (&v1, &v2) {
+                (Some(DictionaryKey::Constant(v1)), Some(DictionaryKey::Constant(v2))) => {
+                    if check_repeated_literals && v1 == v2 {
+                        checks.push(Check::new(
+                            CheckKind::MultiValueRepeatedKeyLiteral,
+                            locator.locate_check(Range::from_located(k2)),
+                        ))
+                    }
+                }
+                (Some(DictionaryKey::Variable(v1)), Some(DictionaryKey::Variable(v2))) => {
+                    if check_repeated_variables && v1 == v2 {
+                        checks.push(Check::new(
+                            CheckKind::MultiValueRepeatedKeyVariable((*v2).to_string()),
+                            locator.locate_check(Range::from_located(k2)),
+                        ))
+                    }
+                }
+                _ => {}
+            }
+        }
+    }
+
+    checks
+}
+
+fn is_constant(expr: &Expr) -> bool {
+    match &expr.node {
+        ExprKind::Constant { .. } => true,
+        ExprKind::Tuple { elts, .. } => elts.iter().all(is_constant),
+        _ => false,
+    }
+}
+
+fn is_singleton(expr: &Expr) -> bool {
+    matches!(
+        expr.node,
+        ExprKind::Constant {
+            value: Constant::None | Constant::Bool(_) | Constant::Ellipsis,
+            ..
+        }
+    )
+}
+
+fn is_constant_non_singleton(expr: &Expr) -> bool {
+    is_constant(expr) && !is_singleton(expr)
+}
+
+/// Check IsLiteral compliance.
+pub fn is_literal(left: &Expr, ops: &[Cmpop], comparators: &[Expr], location: Range) -> Vec<Check> {
+    let mut checks: Vec<Check> = vec![];
+
+    let mut left = left;
+    for (op, right) in izip!(ops, comparators) {
+        if matches!(op, Cmpop::Is | Cmpop::IsNot)
+            && (is_constant_non_singleton(left) || is_constant_non_singleton(right))
+        {
+            checks.push(Check::new(CheckKind::IsLiteral, location));
+        }
+        left = right;
+    }
+
+    checks
+}
+
+/// Check TwoStarredExpressions and TooManyExpressionsInStarredAssignment compliance.
+pub fn starred_expressions(
+    elts: &[Expr],
+    check_too_many_expressions: bool,
+    check_two_starred_expressions: bool,
+    location: Range,
+) -> Option<Check> {
+    let mut has_starred: bool = false;
+    let mut starred_index: Option<usize> = None;
+    for (index, elt) in elts.iter().enumerate() {
+        if matches!(elt.node, ExprKind::Starred { .. }) {
+            if has_starred && check_two_starred_expressions {
+                return Some(Check::new(CheckKind::TwoStarredExpressions, location));
+            }
+            has_starred = true;
+            starred_index = Some(index);
+        }
+    }
+
+    if check_too_many_expressions {
+        if let Some(starred_index) = starred_index {
+            if starred_index >= 1 << 8 || elts.len() - starred_index > 1 << 24 {
+                return Some(Check::new(CheckKind::ExpressionsInStarAssignment, location));
+            }
+        }
+    }
+
+    None
+}
+
+/// Check BreakOutsideLoop compliance.
+pub fn break_outside_loop(
+    stmt: &Stmt,
+    parents: &[&Stmt],
+    parent_stack: &[usize],
+    locator: &dyn CheckLocator,
+) -> Option<Check> {
+    let mut allowed: bool = false;
+    let mut parent = stmt;
+    for index in parent_stack.iter().rev() {
+        let child = parent;
+        parent = parents[*index];
+        match &parent.node {
+            StmtKind::For { orelse, .. }
+            | StmtKind::AsyncFor { orelse, .. }
+            | StmtKind::While { orelse, .. } => {
+                if !orelse.contains(child) {
+                    allowed = true;
+                    break;
+                }
+            }
+
+            StmtKind::FunctionDef { .. }
+            | StmtKind::AsyncFunctionDef { .. }
+            | StmtKind::ClassDef { .. } => {
+                break;
+            }
+            _ => {}
+        }
+    }
+
+    if !allowed {
+        Some(Check::new(
+            CheckKind::BreakOutsideLoop,
+            locator.locate_check(Range::from_located(stmt)),
+        ))
+    } else {
+        None
+    }
+}
+
+/// Check ContinueOutsideLoop compliance.
+pub fn continue_outside_loop(
+    stmt: &Stmt,
+    parents: &[&Stmt],
+    parent_stack: &[usize],
+    locator: &dyn CheckLocator,
+) -> Option<Check> {
+    let mut allowed: bool = false;
+    let mut parent = stmt;
+    for index in parent_stack.iter().rev() {
+        let child = parent;
+        parent = parents[*index];
+        match &parent.node {
+            StmtKind::For { orelse, .. }
+            | StmtKind::AsyncFor { orelse, .. }
+            | StmtKind::While { orelse, .. } => {
+                if !orelse.contains(child) {
+                    allowed = true;
+                    break;
+                }
+            }
+
+            StmtKind::FunctionDef { .. }
+            | StmtKind::AsyncFunctionDef { .. }
+            | StmtKind::ClassDef { .. } => {
+                break;
+            }
+            _ => {}
+        }
+    }
+
+    if !allowed {
+        Some(Check::new(
+            CheckKind::ContinueOutsideLoop,
+            locator.locate_check(Range::from_located(stmt)),
+        ))
+    } else {
+        None
+    }
+}
--- a/src/pyflakes/fixes.rs
+++ b/src/pyflakes/fixes.rs
@@ -0,0 +1,147 @@
+use libcst_native::ImportNames::Aliases;
+use libcst_native::NameOrAttribute::N;
+use libcst_native::{Codegen, SmallStatement, Statement};
+use rustpython_ast::Stmt;
+
+use crate::ast::operations::SourceCodeLocator;
+use crate::ast::types::Range;
+use crate::autofix::{helpers, Fix};
+
+/// Generate a Fix to remove any unused imports from an `import` statement.
+pub fn remove_unused_imports(
+    locator: &mut SourceCodeLocator,
+    full_names: &[&str],
+    stmt: &Stmt,
+    parent: Option<&Stmt>,
+    deleted: &[&Stmt],
+) -> anyhow::Result<Fix> {
+    let mut tree = match libcst_native::parse_module(
+        locator.slice_source_code_range(&Range::from_located(stmt)),
+        None,
+    ) {
+        Ok(m) => m,
+        Err(_) => return Err(anyhow::anyhow!("Failed to extract CST from source.")),
+    };
+
+    let body = if let Some(Statement::Simple(body)) = tree.body.first_mut() {
+        body
+    } else {
+        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple."));
+    };
+    let body = if let Some(SmallStatement::Import(body)) = body.body.first_mut() {
+        body
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected node to be: SmallStatement::ImportFrom."
+        ));
+    };
+    let aliases = &mut body.names;
+
+    // Preserve the trailing comma (or not) from the last entry.
+    let trailing_comma = aliases.last().and_then(|alias| alias.comma.clone());
+
+    // Identify unused imports from within the `import from`.
+    let mut removable = vec![];
+    for (index, alias) in aliases.iter().enumerate() {
+        if let N(import_name) = &alias.name {
+            if full_names.contains(&import_name.value) {
+                removable.push(index);
+            }
+        }
+    }
+    // TODO(charlie): This is quadratic.
+    for index in removable.iter().rev() {
+        aliases.remove(*index);
+    }
+
+    if let Some(alias) = aliases.last_mut() {
+        alias.comma = trailing_comma;
+    }
+
+    if aliases.is_empty() {
+        helpers::remove_stmt(stmt, parent, deleted)
+    } else {
+        let mut state = Default::default();
+        tree.codegen(&mut state);
+
+        Ok(Fix::replacement(
+            state.to_string(),
+            stmt.location,
+            stmt.end_location.unwrap(),
+        ))
+    }
+}
+
+/// Generate a Fix to remove any unused imports from an `import from` statement.
+pub fn remove_unused_import_froms(
+    locator: &mut SourceCodeLocator,
+    full_names: &[&str],
+    stmt: &Stmt,
+    parent: Option<&Stmt>,
+    deleted: &[&Stmt],
+) -> anyhow::Result<Fix> {
+    let mut tree = match libcst_native::parse_module(
+        locator.slice_source_code_range(&Range::from_located(stmt)),
+        None,
+    ) {
+        Ok(m) => m,
+        Err(_) => return Err(anyhow::anyhow!("Failed to extract CST from source.")),
+    };
+
+    let body = if let Some(Statement::Simple(body)) = tree.body.first_mut() {
+        body
+    } else {
+        return Err(anyhow::anyhow!("Expected node to be: Statement::Simple."));
+    };
+    let body = if let Some(SmallStatement::ImportFrom(body)) = body.body.first_mut() {
+        body
+    } else {
+        return Err(anyhow::anyhow!(
+            "Expected node to be: SmallStatement::ImportFrom."
+        ));
+    };
+    let aliases = if let Aliases(aliases) = &mut body.names {
+        aliases
+    } else {
+        return Err(anyhow::anyhow!("Expected node to be: Aliases."));
+    };
+
+    // Preserve the trailing comma (or not) from the last entry.
+    let trailing_comma = aliases.last().and_then(|alias| alias.comma.clone());
+
+    // Identify unused imports from within the `import from`.
+    let mut removable = vec![];
+    for (index, alias) in aliases.iter().enumerate() {
+        if let N(name) = &alias.name {
+            let import_name = if let Some(N(module_name)) = &body.module {
+                format!("{}.{}", module_name.value, name.value)
+            } else {
+                name.value.to_string()
+            };
+            if full_names.contains(&import_name.as_str()) {
+                removable.push(index);
+            }
+        }
+    }
+    // TODO(charlie): This is quadratic.
+    for index in removable.iter().rev() {
+        aliases.remove(*index);
+    }
+
+    if let Some(alias) = aliases.last_mut() {
+        alias.comma = trailing_comma;
+    }
+
+    if aliases.is_empty() {
+        helpers::remove_stmt(stmt, parent, deleted)
+    } else {
+        let mut state = Default::default();
+        tree.codegen(&mut state);
+
+        Ok(Fix::replacement(
+            state.to_string(),
+            stmt.location,
+            stmt.end_location.unwrap(),
+        ))
+    }
+}
--- a/src/pyflakes/mod.rs
+++ b/src/pyflakes/mod.rs
@@ -0,0 +1,3 @@
+pub mod checks;
+pub mod fixes;
+pub mod plugins;
--- a/src/pyflakes/plugins/assert_tuple.rs
+++ b/src/pyflakes/plugins/assert_tuple.rs
@@ -1,12 +1,11 @@
 use rustpython_ast::{Expr, Stmt};

-use crate::ast::checkers;
 use crate::ast::types::{CheckLocator, Range};
 use crate::check_ast::Checker;
+use crate::pyflakes::checks;

 pub fn assert_tuple(checker: &mut Checker, stmt: &Stmt, test: &Expr) {
-    if let Some(check) =
-        checkers::assert_tuple(test, checker.locate_check(Range::from_located(stmt)))
+    if let Some(check) = checks::assert_tuple(test, checker.locate_check(Range::from_located(stmt)))
    {
        checker.add_check(check);
    }
--- a/src/pyflakes/plugins/if_tuple.rs
+++ b/src/pyflakes/plugins/if_tuple.rs
@@ -1,11 +1,11 @@
 use rustpython_ast::{Expr, Stmt};

-use crate::ast::checkers;
 use crate::ast::types::{CheckLocator, Range};
 use crate::check_ast::Checker;
+use crate::pyflakes::checks;

 pub fn if_tuple(checker: &mut Checker, stmt: &Stmt, test: &Expr) {
-    if let Some(check) = checkers::if_tuple(test, checker.locate_check(Range::from_located(stmt))) {
+    if let Some(check) = checks::if_tuple(test, checker.locate_check(Range::from_located(stmt))) {
        checker.add_check(check);
    }
 }
--- a/src/pyflakes/plugins/invalid_print_syntax.rs
+++ b/src/pyflakes/plugins/invalid_print_syntax.rs
--- a/src/pyflakes/plugins/mod.rs
+++ b/src/pyflakes/plugins/mod.rs
@@ -0,0 +1,7 @@
+pub use assert_tuple::assert_tuple;
+pub use if_tuple::if_tuple;
+pub use invalid_print_syntax::invalid_print_syntax;
+
+mod assert_tuple;
+mod if_tuple;
+mod invalid_print_syntax;
--- a/src/python/mod.rs
+++ b/src/python/mod.rs
--- a/src/pyupgrade/checks.rs
+++ b/src/pyupgrade/checks.rs
@@ -0,0 +1,156 @@
+use rustpython_parser::ast::{ArgData, Expr, ExprKind, Stmt, StmtKind};
+
+use crate::ast::helpers;
+use crate::ast::types::{Binding, BindingKind, Range, Scope, ScopeKind};
+use crate::checks::{Check, CheckKind};
+use crate::pyupgrade::types::Primitive;
+
+/// Check that `super()` has no args
+pub fn super_args(
+    scope: &Scope,
+    parents: &[&Stmt],
+    expr: &Expr,
+    func: &Expr,
+    args: &[Expr],
+) -> Option<Check> {
+    if !helpers::is_super_call_with_arguments(func, args) {
+        return None;
+    }
+
+    // Check: are we in a Function scope?
+    if !matches!(scope.kind, ScopeKind::Function { .. }) {
+        return None;
+    }
+
+    let mut parents = parents.iter().rev();
+
+    // For a `super` invocation to be unnecessary, the first argument needs to match the enclosing
+    // class, and the second argument needs to match the first argument to the enclosing function.
+    if let [first_arg, second_arg] = args {
+        // Find the enclosing function definition (if any).
+        if let Some(StmtKind::FunctionDef {
+            args: parent_args, ..
+        }) = parents
+            .find(|stmt| matches!(stmt.node, StmtKind::FunctionDef { .. }))
+            .map(|stmt| &stmt.node)
+        {
+            // Extract the name of the first argument to the enclosing function.
+            if let Some(ArgData {
+                arg: parent_arg, ..
+            }) = parent_args.args.first().map(|expr| &expr.node)
+            {
+                // Find the enclosing class definition (if any).
+                if let Some(StmtKind::ClassDef {
+                    name: parent_name, ..
+                }) = parents
+                    .find(|stmt| matches!(stmt.node, StmtKind::ClassDef { .. }))
+                    .map(|stmt| &stmt.node)
+                {
+                    if let (
+                        ExprKind::Name {
+                            id: first_arg_id, ..
+                        },
+                        ExprKind::Name {
+                            id: second_arg_id, ..
+                        },
+                    ) = (&first_arg.node, &second_arg.node)
+                    {
+                        if first_arg_id == parent_name && second_arg_id == parent_arg {
+                            return Some(Check::new(
+                                CheckKind::SuperCallWithParameters,
+                                Range::from_located(expr),
+                            ));
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    None
+}
+
+/// Check UselessMetaclassType compliance.
+pub fn useless_metaclass_type(targets: &[Expr], value: &Expr, location: Range) -> Option<Check> {
+    if targets.len() == 1 {
+        if let ExprKind::Name { id, .. } = targets.first().map(|expr| &expr.node).unwrap() {
+            if id == "__metaclass__" {
+                if let ExprKind::Name { id, .. } = &value.node {
+                    if id == "type" {
+                        return Some(Check::new(CheckKind::UselessMetaclassType, location));
+                    }
+                }
+            }
+        }
+    }
+    None
+}
+
+/// Check UnnecessaryAbspath compliance.
+pub fn unnecessary_abspath(func: &Expr, args: &[Expr], location: Range) -> Option<Check> {
+    // Validate the arguments.
+    if args.len() == 1 {
+        if let ExprKind::Name { id, .. } = &args[0].node {
+            if id == "__file__" {
+                match &func.node {
+                    ExprKind::Attribute { attr: id, .. } | ExprKind::Name { id, .. } => {
+                        if id == "abspath" {
+                            return Some(Check::new(CheckKind::UnnecessaryAbspath, location));
+                        }
+                    }
+                    _ => {}
+                }
+            }
+        }
+    }
+    None
+}
+
+/// Check UselessObjectInheritance compliance.
+pub fn useless_object_inheritance(name: &str, bases: &[Expr], scope: &Scope) -> Option<Check> {
+    for expr in bases {
+        if let ExprKind::Name { id, .. } = &expr.node {
+            if id == "object" {
+                match scope.values.get(id) {
+                    None
+                    | Some(Binding {
+                        kind: BindingKind::Builtin,
+                        ..
+                    }) => {
+                        return Some(Check::new(
+                            CheckKind::UselessObjectInheritance(name.to_string()),
+                            Range::from_located(expr),
+                        ));
+                    }
+                    _ => {}
+                }
+            }
+        }
+    }
+
+    None
+}
+
+/// Check TypeOfPrimitive compliance.
+pub fn type_of_primitive(func: &Expr, args: &[Expr], location: Range) -> Option<Check> {
+    // Validate the arguments.
+    if args.len() == 1 {
+        match &func.node {
+            ExprKind::Attribute { attr: id, .. } | ExprKind::Name { id, .. } => {
+                if id == "type" {
+                    if let ExprKind::Constant { value, .. } = &args[0].node {
+                        if let Some(primitive) = Primitive::from_constant(value) {
+                            return Some(Check::new(
+                                CheckKind::TypeOfPrimitive(primitive),
+                                location,
+                            ));
+                        }
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+
+    None
+}
--- a/src/pyupgrade/fixes.rs
+++ b/src/pyupgrade/fixes.rs
@@ -0,0 +1,133 @@
+use libcst_native::{Codegen, Expression, SmallStatement, Statement};
+use rustpython_ast::{Expr, Keyword, Location};
+use rustpython_parser::lexer;
+use rustpython_parser::lexer::Tok;
+
+use crate::ast::helpers;
+use crate::ast::operations::SourceCodeLocator;
+use crate::ast::types::Range;
+use crate::autofix::Fix;
+
+/// 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_at(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(helpers::to_absolute(&start, stmt_at));
+                }
+                count += 1;
+            }
+
+            if matches!(tok, Tok::Rpar) {
+                count -= 1;
+                if count == 0 {
+                    fix_end = Some(helpers::to_absolute(&end, stmt_at));
+                    break;
+                }
+            }
+        }
+
+        return match (fix_start, fix_end) {
+            (Some(start), Some(end)) => Some(Fix::replacement("".to_string(), start, end)),
+            _ => 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 = helpers::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::replacement("".to_string(), start, end)),
+            _ => 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 = helpers::to_absolute(&start, stmt_at);
+            let end = helpers::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::replacement("".to_string(), start, end)),
+            _ => None,
+        }
+    }
+}
+
+pub fn remove_super_arguments(locator: &mut SourceCodeLocator, expr: &Expr) -> Option<Fix> {
+    let range = Range::from_located(expr);
+    let contents = locator.slice_source_code_range(&range);
+
+    let mut tree = match libcst_native::parse_module(contents, None) {
+        Ok(m) => m,
+        Err(_) => return None,
+    };
+
+    if let Some(Statement::Simple(body)) = tree.body.first_mut() {
+        if let Some(SmallStatement::Expr(body)) = body.body.first_mut() {
+            if let Expression::Call(body) = &mut body.value {
+                body.args = vec![];
+                body.whitespace_before_args = Default::default();
+                body.whitespace_after_func = Default::default();
+
+                let mut state = Default::default();
+                tree.codegen(&mut state);
+
+                return Some(Fix::replacement(
+                    state.to_string(),
+                    range.location,
+                    range.end_location,
+                ));
+            }
+        }
+    }
+
+    None
+}
--- a/src/pyupgrade/mod.rs
+++ b/src/pyupgrade/mod.rs
@@ -0,0 +1,4 @@
+mod checks;
+pub mod fixes;
+pub mod plugins;
+pub mod types;
--- a/src/pyupgrade/plugins/deprecated_unittest_alias.rs
+++ b/src/pyupgrade/plugins/deprecated_unittest_alias.rs
@@ -1,12 +1,13 @@
 use std::collections::BTreeMap;

 use once_cell::sync::Lazy;
-use rustpython_ast::{Expr, ExprKind, Location};
+use rustpython_ast::{Expr, ExprKind};

 use crate::ast::types::Range;
 use crate::autofix::fixer;
+use crate::autofix::Fix;
 use crate::check_ast::Checker;
-use crate::checks::{Check, CheckKind, Fix};
+use crate::checks::{Check, CheckKind};

 static DEPRECATED_ALIASES: Lazy<BTreeMap<&'static str, &'static str>> = Lazy::new(|| {
    BTreeMap::from([
@@ -38,15 +39,11 @@ pub fn deprecated_unittest_alias(checker: &mut Checker, expr: &Expr) {
                        Range::from_located(expr),
                    );
                    if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
-                        check.amend(Fix {
-                            content: format!("self.{}", target),
-                            location: Location::new(expr.location.row(), expr.location.column()),
-                            end_location: Location::new(
-                                expr.end_location.row(),
-                                expr.end_location.column(),
-                            ),
-                            applied: false,
-                        });
+                        check.amend(Fix::replacement(
+                            format!("self.{}", target),
+                            expr.location,
+                            expr.end_location.unwrap(),
+                        ));
                    }
                    checker.add_check(check);
                }
--- a/src/pyupgrade/plugins/mod.rs
+++ b/src/pyupgrade/plugins/mod.rs
@@ -1,10 +1,4 @@
-pub use assert_false::assert_false;
-pub use assert_tuple::assert_tuple;
 pub use deprecated_unittest_alias::deprecated_unittest_alias;
-pub use duplicate_exceptions::duplicate_exceptions;
-pub use if_tuple::if_tuple;
-pub use invalid_print_syntax::invalid_print_syntax;
-pub use print_call::print_call;
 pub use super_call_with_parameters::super_call_with_parameters;
 pub use type_of_primitive::type_of_primitive;
 pub use unnecessary_abspath::unnecessary_abspath;
@@ -13,13 +7,7 @@ pub use use_pep604_annotation::use_pep604_annotation;
 pub use useless_metaclass_type::useless_metaclass_type;
 pub use useless_object_inheritance::useless_object_inheritance;

-mod assert_false;
-mod assert_tuple;
 mod deprecated_unittest_alias;
-mod duplicate_exceptions;
-mod if_tuple;
-mod invalid_print_syntax;
-mod print_call;
 mod super_call_with_parameters;
 mod type_of_primitive;
 mod unnecessary_abspath;
--- a/src/pyupgrade/plugins/super_call_with_parameters.rs
+++ b/src/pyupgrade/plugins/super_call_with_parameters.rs
@@ -1,15 +1,12 @@
 use rustpython_ast::{Expr, Stmt};

-use crate::ast::{checkers, helpers};
-use crate::autofix::{fixer, fixes};
+use crate::ast::helpers;
+use crate::autofix::fixer;
 use crate::check_ast::Checker;
+use crate::pyupgrade;
+use crate::pyupgrade::checks;

-pub fn super_call_with_parameters(
-    checker: &mut Checker,
-    expr: &Expr,
-    func: &Expr,
-    args: &Vec<Expr>,
-) {
+pub fn super_call_with_parameters(checker: &mut Checker, expr: &Expr, func: &Expr, args: &[Expr]) {
    // Only bother going through the super check at all if we're in a `super` call.
    // (We check this in `check_super_args` too, so this is just an optimization.)
    if helpers::is_super_call_with_arguments(func, args) {
@@ -19,9 +16,11 @@ pub fn super_call_with_parameters(
            .iter()
            .map(|index| checker.parents[*index])
            .collect();
-        if let Some(mut check) = checkers::super_args(scope, &parents, expr, func, args) {
+        if let Some(mut check) = checks::super_args(scope, &parents, expr, func, args) {
            if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
-                if let Some(fix) = fixes::remove_super_arguments(&mut checker.locator, expr) {
+                if let Some(fix) =
+                    pyupgrade::fixes::remove_super_arguments(&mut checker.locator, expr)
+                {
                    check.amend(fix);
                }
            }
--- a/src/pyupgrade/plugins/type_of_primitive.rs
+++ b/src/pyupgrade/plugins/type_of_primitive.rs
@@ -1,23 +1,23 @@
 use rustpython_ast::Expr;

-use crate::ast::checkers;
 use crate::ast::types::{CheckLocator, Range};
 use crate::autofix::fixer;
+use crate::autofix::Fix;
 use crate::check_ast::Checker;
-use crate::checks::{CheckKind, Fix};
+use crate::checks::CheckKind;
+use crate::pyupgrade::checks;

-pub fn type_of_primitive(checker: &mut Checker, expr: &Expr, func: &Expr, args: &Vec<Expr>) {
+pub fn type_of_primitive(checker: &mut Checker, expr: &Expr, func: &Expr, args: &[Expr]) {
    if let Some(mut check) =
-        checkers::type_of_primitive(func, args, checker.locate_check(Range::from_located(expr)))
+        checks::type_of_primitive(func, args, checker.locate_check(Range::from_located(expr)))
    {
        if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
            if let CheckKind::TypeOfPrimitive(primitive) = &check.kind {
-                check.amend(Fix {
-                    content: primitive.builtin(),
-                    location: expr.location,
-                    end_location: expr.end_location,
-                    applied: false,
-                });
+                check.amend(Fix::replacement(
+                    primitive.builtin(),
+                    expr.location,
+                    expr.end_location.unwrap(),
+                ));
            }
        }
        checker.add_check(check);
--- a/src/pyupgrade/plugins/unnecessary_abspath.rs
+++ b/src/pyupgrade/plugins/unnecessary_abspath.rs
@@ -0,0 +1,22 @@
+use rustpython_ast::Expr;
+
+use crate::ast::types::{CheckLocator, Range};
+use crate::autofix::fixer;
+use crate::autofix::Fix;
+use crate::check_ast::Checker;
+use crate::pyupgrade::checks;
+
+pub fn unnecessary_abspath(checker: &mut Checker, expr: &Expr, func: &Expr, args: &[Expr]) {
+    if let Some(mut check) =
+        checks::unnecessary_abspath(func, args, checker.locate_check(Range::from_located(expr)))
+    {
+        if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
+            check.amend(Fix::replacement(
+                "__file__".to_string(),
+                expr.location,
+                expr.end_location.unwrap(),
+            ));
+        }
+        checker.add_check(check);
+    }
+}
--- a/src/pyupgrade/plugins/use_pep585_annotation.rs
+++ b/src/pyupgrade/plugins/use_pep585_annotation.rs
@@ -2,8 +2,9 @@ use rustpython_ast::Expr;

 use crate::ast::types::Range;
 use crate::autofix::fixer;
+use crate::autofix::Fix;
 use crate::check_ast::Checker;
-use crate::checks::{Check, CheckKind, Fix};
+use crate::checks::{Check, CheckKind};
 use crate::python::typing;

 pub fn use_pep585_annotation(checker: &mut Checker, expr: &Expr, id: &str) {
@@ -14,12 +15,11 @@ pub fn use_pep585_annotation(checker: &mut Checker, expr: &Expr, id: &str) {
            Range::from_located(expr),
        );
        if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
-            check.amend(Fix {
-                content: id.to_lowercase(),
-                location: expr.location,
-                end_location: expr.end_location,
-                applied: false,
-            })
+            check.amend(Fix::replacement(
+                id.to_lowercase(),
+                expr.location,
+                expr.end_location.unwrap(),
+            ));
        }
        checker.add_check(check);
    }
--- a/src/pyupgrade/plugins/use_pep604_annotation.rs
+++ b/src/pyupgrade/plugins/use_pep604_annotation.rs
@@ -3,8 +3,9 @@ use rustpython_ast::{Constant, Expr, ExprKind, Operator};
 use crate::ast::helpers::match_name_or_attr;
 use crate::ast::types::Range;
 use crate::autofix::fixer;
+use crate::autofix::Fix;
 use crate::check_ast::Checker;
-use crate::checks::{Check, CheckKind, Fix};
+use crate::checks::{Check, CheckKind};
 use crate::code_gen::SourceGenerator;

 fn optional(expr: &Expr) -> Expr {
@@ -49,12 +50,11 @@ pub fn use_pep604_annotation(checker: &mut Checker, expr: &Expr, value: &Expr, s
            let mut generator = SourceGenerator::new();
            if let Ok(()) = generator.unparse_expr(&optional(slice), 0) {
                if let Ok(content) = generator.generate() {
-                    check.amend(Fix {
+                    check.amend(Fix::replacement(
                        content,
-                        location: expr.location,
-                        end_location: expr.end_location,
-                        applied: false,
-                    })
+                        expr.location,
+                        expr.end_location.unwrap(),
+                    ))
                }
            }
        }
@@ -70,12 +70,11 @@ pub fn use_pep604_annotation(checker: &mut Checker, expr: &Expr, value: &Expr, s
                    let mut generator = SourceGenerator::new();
                    if let Ok(()) = generator.unparse_expr(&union(elts), 0) {
                        if let Ok(content) = generator.generate() {
-                            check.amend(Fix {
+                            check.amend(Fix::replacement(
                                content,
-                                location: expr.location,
-                                end_location: expr.end_location,
-                                applied: false,
-                            })
+                                expr.location,
+                                expr.end_location.unwrap(),
+                            ))
                        }
                    }
                }
@@ -84,12 +83,11 @@ pub fn use_pep604_annotation(checker: &mut Checker, expr: &Expr, value: &Expr, s
                    let mut generator = SourceGenerator::new();
                    if let Ok(()) = generator.unparse_expr(slice, 0) {
                        if let Ok(content) = generator.generate() {
-                            check.amend(Fix {
+                            check.amend(Fix::replacement(
                                content,
-                                location: expr.location,
-                                end_location: expr.end_location,
-                                applied: false,
-                            });
+                                expr.location,
+                                expr.end_location.unwrap(),
+                            ));
                        }
                    }
                }
--- a/src/pyupgrade/plugins/useless_metaclass_type.rs
+++ b/src/pyupgrade/plugins/useless_metaclass_type.rs
@@ -1,18 +1,13 @@
 use log::error;
 use rustpython_ast::{Expr, Stmt};

-use crate::ast::checkers;
 use crate::ast::types::{CheckLocator, Range};
-use crate::autofix::{fixer, fixes};
+use crate::autofix::{fixer, helpers};
 use crate::check_ast::Checker;
+use crate::pyupgrade::checks;

-pub fn useless_metaclass_type(
-    checker: &mut Checker,
-    stmt: &Stmt,
-    value: &Expr,
-    targets: &Vec<Expr>,
-) {
-    if let Some(mut check) = checkers::useless_metaclass_type(
+pub fn useless_metaclass_type(checker: &mut Checker, stmt: &Stmt, value: &Expr, targets: &[Expr]) {
+    if let Some(mut check) = checks::useless_metaclass_type(
        targets,
        value,
        checker.locate_check(Range::from_located(stmt)),
@@ -25,13 +20,13 @@ pub fn useless_metaclass_type(
                .map(|index| checker.parents[*index])
                .collect();

-            match fixes::remove_stmt(
+            match helpers::remove_stmt(
                checker.parents[context.defined_by],
                context.defined_in.map(|index| checker.parents[index]),
                &deleted,
            ) {
                Ok(fix) => {
-                    if fix.content.is_empty() || fix.content == "pass" {
+                    if fix.patch.content.is_empty() || fix.patch.content == "pass" {
                        checker.deletions.insert(context.defined_by);
                    }
                    check.amend(fix)
--- a/src/pyupgrade/plugins/useless_object_inheritance.rs
+++ b/src/pyupgrade/plugins/useless_object_inheritance.rs
@@ -1,8 +1,9 @@
 use rustpython_ast::{Expr, Keyword, Stmt};

-use crate::ast::checkers;
-use crate::autofix::{fixer, fixes};
+use crate::autofix::fixer;
 use crate::check_ast::Checker;
+use crate::pyupgrade;
+use crate::pyupgrade::checks;

 pub fn useless_object_inheritance(
    checker: &mut Checker,
@@ -12,9 +13,9 @@ pub fn useless_object_inheritance(
    keywords: &[Keyword],
 ) {
    let scope = checker.current_scope();
-    if let Some(mut check) = checkers::useless_object_inheritance(name, bases, scope) {
+    if let Some(mut check) = checks::useless_object_inheritance(name, bases, scope) {
        if matches!(checker.autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
-            if let Some(fix) = fixes::remove_class_def_base(
+            if let Some(fix) = pyupgrade::fixes::remove_class_def_base(
                &mut checker.locator,
                &stmt.location,
                check.location,
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Charlie Marsh	db3c847771	Bump version to 0.0.83	2022-10-25 21:24:13 -04:00
Charlie Marsh	4adbfc24a5	Increment flake8-bugbear to 6/32	2022-10-25 21:23:13 -04:00
Charlie Marsh	8f734a6562	Implement B002 (unary prefix increment) (#468 )	2022-10-25 21:10:51 -04:00
Charlie Marsh	bcf7519eb3	Implement B017 (no assertRaises(Exception)) (#467 )	2022-10-25 20:55:00 -04:00
Heyward Fann	66089052ee	chore: typo on #283 link (#464 )	2022-10-25 08:02:11 -04:00
Jeong YunWon	d50cc8ff65	Restyle flake8_comprehensions::check to reduce indent (#462 )	2022-10-24 15:16:56 -04:00
Harutaka Kawamura	b75ea94f58	Fix uppercase and lowercase check (#461 )	2022-10-22 12:49:13 -04:00
Harutaka Kawamura	2c24e2fd28	Enable N811, 812, 813, 814, 817 for `Import` (#460 )	2022-10-22 08:31:02 -04:00
Charlie Marsh	f8dc208665	Tweak messages for pep8-naming rules	2022-10-21 17:06:16 -04:00
Charlie Marsh	c72b8e8d1e	Bump version to 0.0.82	2022-10-21 12:15:19 -04:00
Harutaka Kawamura	b108c693fa	Implement N811, 812, 813, 814, and 817 (#457 )	2022-10-20 12:20:44 -04:00
Harutaka Kawamura	aac1912ea7	Implement N807 (#456 )	2022-10-20 11:12:02 -04:00
Charlie Marsh	3dcd26aac3	Add SectionUnderlineAfterName to autofix list	2022-10-17 22:08:49 -04:00
Charlie Marsh	e53b9807f6	Bump version to 0.0.81	2022-10-17 21:43:49 -04:00
Charlie Marsh	36fe8b76d4	Enable autofix for over- and under-indented docstrings (#451 )	2022-10-17 21:43:38 -04:00
Charlie Marsh	f832f88c75	Implement autofix support for D214, D405, D406, and D416 (#450 )	2022-10-17 17:37:20 -04:00
Charlie Marsh	659a28de02	Bump version to 0.0.80	2022-10-17 17:02:44 -04:00
Charlie Marsh	583149a472	Break up autofix/fixes.rs (#449 )	2022-10-17 17:01:50 -04:00
Charlie Marsh	206e6463be	Implement autofix for more docstring-related rules (#448 )	2022-10-17 16:56:47 -04:00
Charlie Marsh	118a9feec8	Split checks and plugins into source-related modules (#447 )	2022-10-17 15:38:49 -04:00
Charlie Marsh	1f2ccb059a	Break up some nested if statements	2022-10-17 13:08:33 -04:00
Charlie Marsh	f4d9d6c858	Fix typo in prev_visible_scope	2022-10-17 13:03:50 -04:00
Charlie Marsh	3477f5664a	Fix README link to near-parity	2022-10-17 11:57:07 -04:00
Charlie Marsh	edefa5219c	Update RustPython to get main versions of end_location etc. (#445 )	2022-10-17 11:52:40 -04:00
Charlie Marsh	cf0d198365	Bump version to 0.0.79	2022-10-16 21:39:01 -04:00
Charlie Marsh	08b14ed77e	Remove leading 'or' from fixable match	2022-10-16 21:38:22 -04:00
Charlie Marsh	6ee3075867	Bump version to 0.0.78	2022-10-16 21:28:25 -04:00
Charlie Marsh	cc8a945cbf	Tweak messages for flake8-comprehensions rules (#444 )	2022-10-16 21:27:13 -04:00
Charlie Marsh	1a1922b3fc	Re-add the fix icon to README.md (#443 )	2022-10-16 21:21:30 -04:00
Charlie Marsh	48bd766298	Implement autofixes for more docstring rules (#442 )	2022-10-16 21:16:57 -04:00
Charlie Marsh	1ece3873cd	Implement autofix for newline-related docstring rules (#441 )	2022-10-16 19:40:38 -04:00
Charlie Marsh	472d902486	Rename docstring_plugins.rs to plugins.rs	2022-10-16 18:39:08 -04:00
Charlie Marsh	4ac6a18d40	Remove some Vec arguments	2022-10-16 18:17:10 -04:00
Charlie Marsh	8a47ea91ba	Use CheckCategory to drive default rules	2022-10-16 18:07:03 -04:00
Charlie Marsh	bd4394aa89	Capitalize pep8-naming messages	2022-10-16 17:58:26 -04:00
Charlie Marsh	56f69ce71e	Bump version to 0.0.77	2022-10-16 13:43:52 -04:00
Charlie Marsh	248a6cd50b	Remove offsets hacks for docstring parsing logic (#440 )	2022-10-16 13:43:30 -04:00
Charlie Marsh	d9e659d817	Revert "Remove trailing colon from messages" This reverts commit `77e5564f4b`.	2022-10-16 12:35:40 -04:00
Charlie Marsh	77e5564f4b	Remove trailing colon from messages	2022-10-16 12:09:46 -04:00
Charlie Marsh	e79766d5ec	Use backticks for pep8-naming messages	2022-10-16 12:09:07 -04:00
Harutaka Kawamura	c55fd76743	Implement N801 ~ N805 (#439 )	2022-10-16 11:58:39 -04:00
Charlie Marsh	e2aedc5ba8	Bump version to 0.0.76	2022-10-15 17:22:12 -04:00
Charlie Marsh	1b2d085460	Mark W292 as a non-AST check	2022-10-15 17:21:52 -04:00
Charlie Marsh	cb138526b1	Add a note on pydocstyle	2022-10-15 17:05:18 -04:00
Charlie Marsh	8eac270d8f	Add an FAQ	2022-10-15 16:52:20 -04:00
Charlie Marsh	6e19fd20bb	Add table of contents	2022-10-15 16:37:52 -04:00
Charlie Marsh	10868445f5	Use H3 for rules sections	2022-10-15 16:33:26 -04:00
Charlie Marsh	e3ecf21287	Break rules table into sections (#437 )	2022-10-15 16:29:08 -04:00
Charlie Marsh	fd849e112e	Remove checkmark from rule table (#436 )	2022-10-15 11:28:32 -04:00
Harutaka Kawamura	af27471c77	Fix C401 and C402 (#435 )	2022-10-15 09:16:43 -04:00
konstin	bb466bc8d3	Add initial wasm32-wasi support (#416 )	2022-10-14 20:58:18 -04:00
Charlie Marsh	7741a713e2	Avoid checking for updates when executing via stdin (#433 )	2022-10-14 20:57:40 -04:00
Charlie Marsh	3ab1cfc6f8	Make some improvements to the README	2022-10-14 17:30:40 -04:00
Charlie Marsh	e73f13473d	Add a .flake8 file for benchmarking	2022-10-14 17:05:24 -04:00
Charlie Marsh	3e8ef5b40f	Bump version to 0.0.75	2022-10-14 14:42:57 -04:00
Charlie Marsh	c59610906c	Optimize imports	2022-10-14 14:42:48 -04:00
Charlie Marsh	2353a52be8	Nest if	2022-10-14 14:36:45 -04:00
Charlie Marsh	bbffdd57ff	Handle multi-byte chars in SourceCodeLocator (#431 )	2022-10-14 14:29:18 -04:00
Charlie Marsh	3c15c578a7	Implement D206, D207, and D208 (#429 )	2022-10-14 13:26:36 -04:00
Charlie Marsh	6a8e31b2ff	Bump version to 0.0.74	2022-10-14 12:36:44 -04:00
Charlie Marsh	6407fd5a33	Re-arrange some docstring modules (#428 )	2022-10-14 12:34:35 -04:00
Harutaka Kawamura	b64040cbb2	Implement C417 (#426 )	2022-10-14 12:34:00 -04:00
Charlie Marsh	952a0eb4e3	Implement checks for Google-style docstrings (#427 )	2022-10-14 11:53:29 -04:00
Charlie Marsh	3e28d6de04	Bump version to 0.0.73	2022-10-14 10:18:42 -04:00
Charlie Marsh	9bbfd1d3b2	Implement docstring argument tracking for NumPy-style docstrings (#425 )	2022-10-14 10:18:07 -04:00
Charlie Marsh	6fb82ab763	Use test_case for macro-driven check tests (#424 )	2022-10-13 18:51:01 -04:00
Charlie Marsh	6b286e9bc1	Add --config as a command-line option (#422 )	2022-10-13 18:13:41 -04:00
Harutaka Kawamura	bcddd9e97f	Implement C413 (#421 )	2022-10-13 11:15:41 -04:00
Harutaka Kawamura	3e789136af	Implement C411 (#420 )	2022-10-13 09:48:27 -04:00
Harutaka Kawamura	07ef3b8754	Implement C416 (#415 )	2022-10-13 08:34:33 -04:00
Charlie Marsh	46e1b16472	Bump version to 0.0.72	2022-10-12 22:43:29 -04:00
fsouza	720bfe0161	Implement --fix with stdin (#405 )	2022-10-12 22:31:46 -04:00
Charlie Marsh	2f69be0d41	Bump version to 0.0.71	2022-10-12 17:14:28 -04:00
Charlie Marsh	54cb2eb15b	Only run section checks when CheckCodes are enabled	2022-10-12 17:14:16 -04:00
Charlie Marsh	167992ad48	Implement D407, D408, D409, D412, and D414 (#413 )	2022-10-12 17:12:54 -04:00
Charlie Marsh	f0dab24079	Implement D405, D406, D410, D411, and D413 (#411 )	2022-10-12 16:31:14 -04:00
Charlie Marsh	77055faab6	Implement D404 and D418 for pydocstyle (#409 )	2022-10-12 13:20:55 -04:00