Bump version to 0.0.55

.editorconfig

@@ -0,0 +1,14 @@
+# Check http://editorconfig.org for more information
+# This is the main config file for this project:
+root = true
+
+[*]
+charset = utf-8
+trim_trailing_whitespace = true
+end_of_line = lf
+indent_style = space
+insert_final_newline = true
+indent_size = 2
+
+[*.{rs,py}]
+indent_size = 4

.pre-commit-config.yaml

@@ -3,3 +3,8 @@ repos:
     rev: v0.0.40
     hooks:
       - id: lint
+
+  - repo: https://github.com/abravalheri/validate-pyproject
+    rev: v0.10.1
+    hooks:
+      - id: validate-pyproject

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+charlie.r.marsh@gmail.com.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

CONTRIBUTING.md

@@ -0,0 +1,105 @@
+# Contributing to ruff
+
+Welcome! We're happy to have you here. Thank you in advance for your contribution to ruff.
+
+## The basics
+
+ruff welcomes contributions in the form of Pull Requests. For small changes (e.g., bug fixes), feel
+free to submit a PR. For larger changes (e.g., new lint rules, new functionality, new configuration
+options), consider submitting an [Issue](https://github.com/charliermarsh/ruff/issues) outlining
+your proposed change.
+
+### Prerequisites
+
+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.
+
+### Development
+
+After cloning the repository, run ruff locally with:
+
+```shell
+cargo run resources/test/fixtures --no-cache
+```
+
+Prior to opening a pull request, ensure that your code has been auto-formatted, and that it passes
+both the lint and test validation checks:
+
+```shell
+cargo fmt     # Auto-formatting...
+cargo clippy  # Linting...
+cargo test    # Testing...
+```
+
+These checks will run on GitHub Actions when you open your Pull Request, but running them locally
+will save you time and expedite the merge process.
+
+Your Pull Request will be reviewed by a maintainer, which may involve a few rounds of iteration
+prior to merging.
+
+### Example: Adding a new lint rule
+
+There are three phases to adding a new lint rule:
+
+1. Define the rule in `src/checks.rs`.
+2. Define the _logic_ for triggering the rule in `src/check_ast.rs` (for AST-based checks)
+   or `src/check_lines.rs` (for text-based checks).
+3. Add a test fixture.
+
+To define the rule, open up `src/checks.rs`. You'll need to define both a `CheckCode` and
+`CheckKind`. As an example, you can grep for `E402` and `ModuleImportNotAtTopOfFile`, and follow the
+pattern implemented therein.
+
+To trigger the rule, you'll likely want to augment the logic in `src/check_ast.rs`, which defines
+the Python AST visitor, responsible for iterating over the abstract syntax tree and collecting
+lint-rule violations as it goes. Grep for the `Check::new` invocations to understand how other,
+similar rules are implemented.
+
+To add a test fixture, create a file under `resources/test/fixtures`, named to match the `CheckCode`
+you defined earlier (e.g., `E402.py`). This file should contain a variety of violations and
+non-violations designed to evaluate and demonstrate the behavior of your lint rule. Run ruff locally
+with (e.g.) `cargo run resources/test/fixtures/E402.py`. Once you're satisified with the output,
+codify the behavior as a snapshot test by adding a new function to the `mod tests` section of
+`src/linter.rs`, like so:
+
+```rust
+#[test]
+fn e402() -> Result<()> {
+    let mut checks = check_path(
+        Path::new("./resources/test/fixtures/E402.py"),
+        &settings::Settings::for_rule(CheckCode::E402),
+        &fixer::Mode::Generate,
+    )?;
+    checks.sort_by_key(|check| check.location);
+    insta::assert_yaml_snapshot!(checks);
+    Ok(())
+}
+```
+
+Then, run `cargo test`. Your test will fail, but you'll be prompted to follow-up with
+`cargo insta review`. Accept the generated snapshot, then commit the snapshot file alongside the
+rest of your changes.
+
+### Example: Adding a new configuration option
+
+ruff's user-facing settings live in two places: first, the command-line options defined with
+[clap](https://docs.rs/clap/latest/clap/) via the `Cli` struct in `src/main.rs`; and second, the
+`Config` struct defined `src/pyproject.rs`, which is responsible for extracting user-defined
+settings from a `pyproject.toml` file.
+
+Ultimately, these two sources of configuration are merged into the `Settings` struct defined
+in `src/settings.rs`, which is then threaded through the codebase.
+
+To add a new configuration option, you'll likely want to _both_ add a CLI option to `src/main.rs`
+_and_ a `pyproject.toml` parameter to `src/pyproject.rs`. If you want to pattern-match against an
+existing example, grep for `dummy_variable_rgx`, which defines a regular expression to match against
+acceptable unused variables (e.g., `_`).
+
+## Release process
+
+As of now, ruff has an ad hoc release process: releases are cut with high frequency via GitHub
+Actions, which automatically generates the appropriate wheels across architectures and publishes
+them to [PyPI](https://pypi.org/project/ruff/).
+
+ruff follows the [semver](https://semver.org/) versioning standard. However, as pre-1.0 software,
+even patch releases may contain [non-backwards-compatible changes](https://semver.org/#spec-item-4).

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruff"
-version = "0.0.47"
+version = "0.0.55"
 edition = "2021"
 
 [lib]
@@ -19,14 +19,17 @@ dirs = { version = "4.0.0" }
 fern = { version = "0.6.1" }
 filetime = { version = "0.2.17" }
 glob = { version = "0.3.0" }
-itertools = { version = "0.10.3" }
+itertools = { version = "0.10.5" }
+libcst = { git = "https://github.com/charliermarsh/LibCST", rev = "32a044c127668df44582f85699358e67803b0d73" }
 log = { version = "0.4.17" }
 notify = { version = "4.0.17" }
 once_cell = { version = "1.13.1" }
 path-absolutize = { version = "3.0.13", features = ["once_cell_cache"] }
 rayon = { version = "1.5.3" }
 regex = { version = "1.6.0" }
-rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "966a80597d626a9a47eaec78471164422d341453" }
+rustpython-ast = { features = ["unparse"], git = "https://github.com/charliermarsh/RustPython.git", rev = "4f457893efc381ad5c432576b24bcc7e4a08c641" }
+rustpython-parser = { features = ["lalrpop"], git = "https://github.com/charliermarsh/RustPython.git", rev = "4f457893efc381ad5c432576b24bcc7e4a08c641" }
+rustpython-common = { git = "https://github.com/charliermarsh/RustPython.git", rev = "4f457893efc381ad5c432576b24bcc7e4a08c641" }
 serde = { version = "1.0.143", features = ["derive"] }
 serde_json = { version = "1.0.83" }
 toml = { version = "0.5.9" }

README.md

@@ -20,7 +20,7 @@ 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#caching)-inspired `--fix` 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
 
@@ -57,7 +57,7 @@ ruff also works with [pre-commit](https://pre-commit.com):
 ```yaml
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.40
+    rev: v0.0.48
     hooks:
       - id: lint
 ```
@@ -201,67 +201,124 @@ 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
+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/)
+- [`pyupgrade`](https://pypi.org/project/pyupgrade/) (partial)
+
 Beyond rule-set parity, ruff suffers from the following limitations vis-à-vis Flake8:
 
-1. Flake8 has a plugin architecture and supports writing custom lint rules.
-2. ruff does not yet support parenthesized context managers.
+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
 
-| 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 | ... |
-| E999 | SyntaxError | SyntaxError: ... |
-| 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 | TooManyExpressionsInStarredAssignment | 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 ==/!= 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 | a `yield` or `yield from` statement outside of a function/method |
-| F706 | ReturnOutsideFunction | a `return` statement outside of a function/method |
-| F707 | DefaultExceptNotLast | an `except:` block as not the last exception handler |
-| 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` |
-| R001 | UselessObjectInheritance | Class `...` inherits from object |
-| R002 | NoAssertEquals | `assertEquals` is deprecated, use `assertEqual` instead |
-| M001 | UnusedNOQA | Unused `noqa` directive |
+The ✅ emoji indicates a rule is enabled by default.
+
+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: `...` | ✅ |  |
+| 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 |  |  |
+| SPR001 | SuperCallWithParameters | Use `super()` instead of `super(__class__, self)` |  | 🛠 |
+| T201 | PrintFound | `print` found |  | 🛠 |
+| T203 | PPrintFound | `pprint` found |  | 🛠 |
+| U001 | UselessMetaclassType | `__metaclass__ = type` is implied |  | 🛠 |
+| R001 | UselessObjectInheritance | Class `...` inherits from object |  | 🛠 |
+| R002 | NoAssertEquals | `assertEquals` is deprecated, use `assertEqual` instead |  | 🛠 |
+| M001 | UnusedNOQA | Unused `noqa` directive |  | 🛠 |
+
+## Integrations
+
+### PyCharm
+
+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)
+
+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)
+
+### GitHub Actions
+
+GitHub Actions has everything you need to run ruff out-of-the-box:
+
+```yaml
+name: CI
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.10"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install ruff
+      - name: Run ruff
+        run: ruff .
+```
 
 ## Development
 
@@ -422,3 +479,8 @@ Summary
 ## License
 
 MIT
+
+## Contributing
+
+Contributions are welcome and hugely appreciated. To get started, check out the
+[contributing guidelines](https://github.com/charliermarsh/ruff/blob/main/CONTRIBUTING.md).

examples/generate_rules_table.rs

@@ -1,19 +1,27 @@
 /// Generate a Markdown-compatible table of supported lint rules.
-use ruff::checks::{CheckCode, ALL_CHECK_CODES};
+use ruff::checks::{CheckCode, ALL_CHECK_CODES, DEFAULT_CHECK_CODES};
 
 fn main() {
     let mut check_codes: Vec<CheckCode> = ALL_CHECK_CODES.to_vec();
     check_codes.sort();
 
-    println!("| Code | Name | Message |");
-    println!("| ---- | ----- | ------- |");
+    println!("| Code | Name | Message |     |     |");
+    println!("| ---- | ---- | ------- | --- | --- |");
     for check_code in check_codes {
         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_str(),
             check_kind.name(),
-            check_kind.body()
+            check_kind.body(),
+            default_token,
+            fix_token
         );
     }
 }

examples/generate_source_code.rs

@@ -0,0 +1,26 @@
+use std::path::PathBuf;
+
+use anyhow::Result;
+use clap::Parser;
+use rustpython_parser::parser;
+
+use ruff::code_gen::SourceGenerator;
+use ruff::fs;
+
+#[derive(Debug, Parser)]
+struct Cli {
+    #[arg(required = true)]
+    file: PathBuf,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    let contents = fs::read_file(&cli.file)?;
+    let python_ast = parser::parse_program(&contents, &cli.file.to_string_lossy())?;
+    let mut generator = SourceGenerator::new();
+    generator.unparse_suite(&python_ast)?;
+    println!("{}", generator.generate()?);
+
+    Ok(())
+}

output.py

@@ -0,0 +1,37 @@
+from collections import Counter
+
+
+def f() -> None:
+    """Docstring goes here."""
+    for x in range(5):
+        print(x)
+    else:
+        print("Nope!")
+
+
+a = {
+    "a",
+    "b",
+    "c",
+    "a",
+    "b",
+    "c",
+    "a",
+    "b",
+    "c",
+    "a",
+    "b",
+    "c",
+    "a",
+    "b",
+    "c",
+    "a",
+    "b",
+    "c",
+    "a",
+    "b",
+    "c",
+}
+
+cls(title=title, before_text=before_text, after_text=after_text, before_description=before_description, after_description=after_description, transform_type=transform_type)
+

resources/test/fixtures/A001.py

@@ -0,0 +1,27 @@
+import some as sum
+from some import other as int
+
+print = 1
+copyright: 'annotation' = 2
+(complex := 3)
+float = object = 4
+min, max = 5, 6
+
+def bytes():
+    pass
+
+class slice:
+    pass
+
+try:
+    ...
+except ImportError as ValueError:
+    ...
+
+for memoryview, *bytearray in []:
+    pass
+
+with open('file') as str, open('file2') as (all, any):
+    pass
+
+[0 for sum in ()]

resources/test/fixtures/A002.py

@@ -0,0 +1,9 @@
+def func1(str, /, type, *complex, Exception, **getattr):
+    pass
+
+
+async def func2(bytes):
+    pass
+
+
+map([], lambda float: ...)

resources/test/fixtures/A003.py

@@ -0,0 +1,8 @@
+class MyClass:
+    ImportError = 4
+
+    def __init__(self):
+        self.float = 5  # is fine
+
+    def str(self):
+        pass

resources/test/fixtures/E402.py

@@ -1,4 +1,8 @@
 """Top-level docstring."""
+
+__all__ = ["y"]
+__version__: str = "0.1.0"
+
 import a
 
 try:

resources/test/fixtures/F401.py

@@ -1,6 +1,5 @@
 from __future__ import all_feature_names
-import os
-import functools
+import functools, os
 from datetime import datetime
 from collections import (
     Counter,
@@ -11,14 +10,36 @@ import multiprocessing.pool
 import multiprocessing.process
 import logging.config
 import logging.handlers
-from typing import TYPING_CHECK, NamedTuple, Dict, Type, TypeVar, List, Set, Union, cast
+from typing import (
+    TYPE_CHECKING,
+    NamedTuple,
+    Dict,
+    Type,
+    TypeVar,
+    List,
+    Set,
+    Union,
+    cast,
+)
+from dataclasses import MISSING, field
 
 from blah import ClassA, ClassB, ClassC
 
-if TYPING_CHECK:
+if TYPE_CHECKING:
     from models import Fruit, Nut, Vegetable
 
 
+if TYPE_CHECKING:
+    import shelve
+    import importlib
+
+if TYPE_CHECKING:
+    """Hello, world!"""
+    import pathlib
+
+    z = 1
+
+
 class X:
     datetime: datetime
     foo: Type["NamedTuple"]
@@ -28,6 +49,9 @@ class X:
         y = Counter()
         z = multiprocessing.pool.ThreadPool()
 
+    def b(self) -> None:
+        import pickle
+
 
 __all__ = ["ClassA"] + ["ClassB"]
 __all__ += ["ClassC"]
@@ -39,3 +63,5 @@ Z = TypeVar("Z", "List", "Set")
 a = list["Fruit"]
 b = Union["Nut", None]
 c = cast("Vegetable", b)
+
+Field = lambda default=MISSING: field(default=default)

resources/test/fixtures/SPR001.py

@@ -0,0 +1,65 @@
+class Parent:
+    def method(self):
+        pass
+
+    def wrong(self):
+        pass
+
+
+class Child(Parent):
+    def method(self):
+        parent = super()  # ok
+        super().method()  # ok
+        Parent.method(self)  # ok
+        Parent.super(1, 2)  # ok
+
+    def wrong(self):
+        parent = super(Child, self)  # wrong
+        super(Child, self).method  # wrong
+        super(
+            Child,
+            self,
+        ).method()  # wrong
+
+
+class BaseClass:
+    def f(self):
+        print("f")
+
+
+def defined_outside(self):
+    super(MyClass, self).f()  # CANNOT use super()
+
+
+class MyClass(BaseClass):
+    def normal(self):
+        super(MyClass, self).f()  # can use super()
+        super().f()
+
+    def different_argument(self, other):
+        super(MyClass, other).f()  # CANNOT use super()
+
+    def comprehension_scope(self):
+        [super(MyClass, self).f() for x in [1]]  # CANNOT use super()
+
+    def inner_functions(self):
+        def outer_argument():
+            super(MyClass, self).f()  # CANNOT use super()
+
+        def inner_argument(self):
+            super(MyClass, self).f()  # can use super()
+            super().f()
+
+        outer_argument()
+        inner_argument(self)
+
+    def inner_class(self):
+        class InnerClass:
+            super(MyClass, self).f()  # CANNOT use super()
+
+            def method(inner_self):
+                super(MyClass, self).f()  # CANNOT use super()
+
+        InnerClass().method()
+
+    defined_outside = defined_outside

resources/test/fixtures/T201.py

@@ -0,0 +1 @@
+print("Hello, world!")  # T201

resources/test/fixtures/T203.py

@@ -0,0 +1,10 @@
+from pprint import pprint
+
+pprint("Hello, world!")  # T203
+
+
+import pprint
+
+pprint.pprint("Hello, world!")  # T203
+
+pprint.pformat("Hello, world!")

resources/test/fixtures/U001.py

@@ -0,0 +1,13 @@
+class A:
+    __metaclass__ = type
+
+
+class B:
+    __metaclass__ = type
+
+    def __init__(self) -> None:
+        pass
+
+
+class C(metaclass=type):
+    pass

resources/test/fixtures/future_annotations.py

@@ -2,7 +2,10 @@ from __future__ import annotations
 
 from dataclasses import dataclass
 
-from models import Fruit, Nut
+from models import (
+    Fruit,
+    Nut,
+)
 
 
 @dataclass

src/ast/checks.rs

@@ -3,17 +3,20 @@ use std::collections::BTreeSet;
 use itertools::izip;
 use regex::Regex;
 use rustpython_parser::ast::{
-    Arg, Arguments, Cmpop, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprKind, Keyword,
-    Location, Stmt, StmtKind, Unaryop,
+    Arg, ArgData, Arguments, Cmpop, Constant, Excepthandler, ExcepthandlerKind, Expr, ExprKind,
+    Keyword, Location, Stmt, StmtKind, Unaryop,
 };
 
 use crate::ast::operations::SourceCodeLocator;
-use crate::ast::types::{Binding, BindingKind, CheckLocator, FunctionScope, Scope, ScopeKind};
+use crate::ast::types::{
+    Binding, BindingKind, CheckLocator, FunctionScope, Range, Scope, ScopeKind,
+};
 use crate::autofix::{fixer, fixes};
 use crate::checks::{Check, CheckKind, Fix, RejectedCmpop};
+use crate::python::builtins::BUILTINS;
 
 /// Check IfTuple compliance.
-pub fn check_if_tuple(test: &Expr, location: Location) -> Option<Check> {
+pub fn check_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));
@@ -23,7 +26,7 @@ pub fn check_if_tuple(test: &Expr, location: Location) -> Option<Check> {
 }
 
 /// Check AssertTuple compliance.
-pub fn check_assert_tuple(test: &Expr, location: Location) -> Option<Check> {
+pub fn check_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));
@@ -50,7 +53,7 @@ pub fn check_not_tests(
                         if check_not_in {
                             checks.push(Check::new(
                                 CheckKind::NotInTest,
-                                locator.locate_check(operand.location),
+                                locator.locate_check(Range::from_located(operand)),
                             ));
                         }
                     }
@@ -58,7 +61,7 @@ pub fn check_not_tests(
                         if check_not_is {
                             checks.push(Check::new(
                                 CheckKind::NotIsTest,
-                                locator.locate_check(operand.location),
+                                locator.locate_check(Range::from_located(operand)),
                             ));
                         }
                     }
@@ -96,7 +99,7 @@ pub fn check_unused_variables(
         {
             checks.push(Check::new(
                 CheckKind::UnusedVariable(name.to_string()),
-                locator.locate_check(binding.location),
+                locator.locate_check(binding.range),
             ));
         }
     }
@@ -105,7 +108,7 @@ pub fn check_unused_variables(
 }
 
 /// Check DoNotAssignLambda compliance.
-pub fn check_do_not_assign_lambda(value: &Expr, location: Location) -> Option<Check> {
+pub fn check_do_not_assign_lambda(value: &Expr, location: Range) -> Option<Check> {
     if let ExprKind::Lambda { .. } = &value.node {
         Some(Check::new(CheckKind::DoNotAssignLambda, location))
     } else {
@@ -113,12 +116,32 @@ pub fn check_do_not_assign_lambda(value: &Expr, location: Location) -> Option<Ch
     }
 }
 
+/// Check UselessMetaclassType compliance.
+pub fn check_useless_metaclass_type(
+    targets: &Vec<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
+}
+
 fn is_ambiguous_name(name: &str) -> bool {
     name == "l" || name == "I" || name == "O"
 }
 
 /// Check AmbiguousVariableName compliance.
-pub fn check_ambiguous_variable_name(name: &str, location: Location) -> Option<Check> {
+pub fn check_ambiguous_variable_name(name: &str, location: Range) -> Option<Check> {
     if is_ambiguous_name(name) {
         Some(Check::new(
             CheckKind::AmbiguousVariableName(name.to_string()),
@@ -130,7 +153,7 @@ pub fn check_ambiguous_variable_name(name: &str, location: Location) -> Option<C
 }
 
 /// Check AmbiguousClassName compliance.
-pub fn check_ambiguous_class_name(name: &str, location: Location) -> Option<Check> {
+pub fn check_ambiguous_class_name(name: &str, location: Range) -> Option<Check> {
     if is_ambiguous_name(name) {
         Some(Check::new(
             CheckKind::AmbiguousClassName(name.to_string()),
@@ -142,7 +165,7 @@ pub fn check_ambiguous_class_name(name: &str, location: Location) -> Option<Chec
 }
 
 /// Check AmbiguousFunctionName compliance.
-pub fn check_ambiguous_function_name(name: &str, location: Location) -> Option<Check> {
+pub fn check_ambiguous_function_name(name: &str, location: Range) -> Option<Check> {
     if is_ambiguous_name(name) {
         Some(Check::new(
             CheckKind::AmbiguousFunctionName(name.to_string()),
@@ -174,7 +197,7 @@ pub fn check_useless_object_inheritance(
                     }) => {
                         let mut check = Check::new(
                             CheckKind::UselessObjectInheritance(name.to_string()),
-                            expr.location,
+                            Range::from_located(expr),
                         );
                         if matches!(autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
                             if let Some(fix) = fixes::remove_class_def_base(
@@ -205,7 +228,7 @@ pub fn check_default_except_not_last(handlers: &Vec<Excepthandler>) -> Option<Ch
         if type_.is_none() && idx < handlers.len() - 1 {
             return Some(Check::new(
                 CheckKind::DefaultExceptNotLast,
-                handler.location,
+                Range::from_located(handler),
             ));
         }
     }
@@ -219,13 +242,19 @@ pub fn check_raise_not_implemented(expr: &Expr) -> Option<Check> {
         ExprKind::Call { func, .. } => {
             if let ExprKind::Name { id, .. } = &func.node {
                 if id == "NotImplemented" {
-                    return Some(Check::new(CheckKind::RaiseNotImplemented, expr.location));
+                    return Some(Check::new(
+                        CheckKind::RaiseNotImplemented,
+                        Range::from_located(expr),
+                    ));
                 }
             }
         }
         ExprKind::Name { id, .. } => {
             if id == "NotImplemented" {
-                return Some(Check::new(CheckKind::RaiseNotImplemented, expr.location));
+                return Some(Check::new(
+                    CheckKind::RaiseNotImplemented,
+                    Range::from_located(expr),
+                ));
             }
         }
         _ => {}
@@ -257,7 +286,10 @@ pub fn check_duplicate_arguments(arguments: &Arguments) -> Vec<Check> {
     for arg in all_arguments {
         let ident = &arg.node.arg;
         if idents.contains(ident.as_str()) {
-            checks.push(Check::new(CheckKind::DuplicateArgumentName, arg.location));
+            checks.push(Check::new(
+                CheckKind::DuplicateArgumentName,
+                Range::from_located(arg),
+            ));
         }
         idents.insert(ident);
     }
@@ -271,12 +303,16 @@ pub fn check_assert_equals(expr: &Expr, autofix: &fixer::Mode) -> Option<Check>
         if attr == "assertEquals" {
             if let ExprKind::Name { id, .. } = &value.node {
                 if id == "self" {
-                    let mut check = Check::new(CheckKind::NoAssertEquals, expr.location);
+                    let mut check =
+                        Check::new(CheckKind::NoAssertEquals, Range::from_located(expr));
                     if matches!(autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
                         check.amend(Fix {
                             content: "assertEqual".to_string(),
-                            start: Location::new(expr.location.row(), expr.location.column() + 1),
-                            end: Location::new(
+                            location: Location::new(
+                                expr.location.row(),
+                                expr.location.column() + 1,
+                            ),
+                            end_location: Location::new(
                                 expr.location.row(),
                                 expr.location.column() + 1 + "assertEquals".len(),
                             ),
@@ -325,7 +361,7 @@ pub fn check_repeated_keys(
                     if check_repeated_literals && v1 == v2 {
                         checks.push(Check::new(
                             CheckKind::MultiValueRepeatedKeyLiteral,
-                            locator.locate_check(k2.location),
+                            locator.locate_check(Range::from_located(k2)),
                         ))
                     }
                 }
@@ -333,7 +369,7 @@ pub fn check_repeated_keys(
                     if check_repeated_variables && v1 == v2 {
                         checks.push(Check::new(
                             CheckKind::MultiValueRepeatedKeyVariable((*v2).to_string()),
-                            locator.locate_check(k2.location),
+                            locator.locate_check(Range::from_located(k2)),
                         ))
                     }
                 }
@@ -372,13 +408,13 @@ pub fn check_literal_comparisons(
         if matches!(op, Cmpop::Eq) {
             checks.push(Check::new(
                 CheckKind::NoneComparison(RejectedCmpop::Eq),
-                locator.locate_check(comparator.location),
+                locator.locate_check(Range::from_located(comparator)),
             ));
         }
         if matches!(op, Cmpop::NotEq) {
             checks.push(Check::new(
                 CheckKind::NoneComparison(RejectedCmpop::NotEq),
-                locator.locate_check(comparator.location),
+                locator.locate_check(Range::from_located(comparator)),
             ));
         }
     }
@@ -392,13 +428,13 @@ pub fn check_literal_comparisons(
             if matches!(op, Cmpop::Eq) {
                 checks.push(Check::new(
                     CheckKind::TrueFalseComparison(value, RejectedCmpop::Eq),
-                    locator.locate_check(comparator.location),
+                    locator.locate_check(Range::from_located(comparator)),
                 ));
             }
             if matches!(op, Cmpop::NotEq) {
                 checks.push(Check::new(
                     CheckKind::TrueFalseComparison(value, RejectedCmpop::NotEq),
-                    locator.locate_check(comparator.location),
+                    locator.locate_check(Range::from_located(comparator)),
                 ));
             }
         }
@@ -418,13 +454,13 @@ pub fn check_literal_comparisons(
             if matches!(op, Cmpop::Eq) {
                 checks.push(Check::new(
                     CheckKind::NoneComparison(RejectedCmpop::Eq),
-                    locator.locate_check(comparator.location),
+                    locator.locate_check(Range::from_located(comparator)),
                 ));
             }
             if matches!(op, Cmpop::NotEq) {
                 checks.push(Check::new(
                     CheckKind::NoneComparison(RejectedCmpop::NotEq),
-                    locator.locate_check(comparator.location),
+                    locator.locate_check(Range::from_located(comparator)),
                 ));
             }
         }
@@ -438,13 +474,13 @@ pub fn check_literal_comparisons(
                 if matches!(op, Cmpop::Eq) {
                     checks.push(Check::new(
                         CheckKind::TrueFalseComparison(value, RejectedCmpop::Eq),
-                        locator.locate_check(comparator.location),
+                        locator.locate_check(Range::from_located(comparator)),
                     ));
                 }
                 if matches!(op, Cmpop::NotEq) {
                     checks.push(Check::new(
                         CheckKind::TrueFalseComparison(value, RejectedCmpop::NotEq),
-                        locator.locate_check(comparator.location),
+                        locator.locate_check(Range::from_located(comparator)),
                     ));
                 }
             }
@@ -481,7 +517,7 @@ pub fn check_is_literal(
     left: &Expr,
     ops: &Vec<Cmpop>,
     comparators: &Vec<Expr>,
-    location: Location,
+    location: Range,
 ) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
@@ -502,7 +538,7 @@ pub fn check_is_literal(
 pub fn check_type_comparison(
     ops: &Vec<Cmpop>,
     comparators: &Vec<Expr>,
-    location: Location,
+    location: Range,
 ) -> Vec<Check> {
     let mut checks: Vec<Check> = vec![];
 
@@ -543,7 +579,7 @@ pub fn check_starred_expressions(
     elts: &[Expr],
     check_too_many_expressions: bool,
     check_two_starred_expressions: bool,
-    location: Location,
+    location: Range,
 ) -> Option<Check> {
     let mut has_starred: bool = false;
     let mut starred_index: Option<usize> = None;
@@ -560,10 +596,7 @@ pub fn check_starred_expressions(
     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::TooManyExpressionsInStarredAssignment,
-                    location,
-                ));
+                return Some(Check::new(CheckKind::ExpressionsInStarAssignment, location));
             }
         }
     }
@@ -605,7 +638,7 @@ pub fn check_break_outside_loop(
     if !allowed {
         Some(Check::new(
             CheckKind::BreakOutsideLoop,
-            locator.locate_check(stmt.location),
+            locator.locate_check(Range::from_located(stmt)),
         ))
     } else {
         None
@@ -646,9 +679,140 @@ pub fn check_continue_outside_loop(
     if !allowed {
         Some(Check::new(
             CheckKind::ContinueOutsideLoop,
-            locator.locate_check(stmt.location),
+            locator.locate_check(Range::from_located(stmt)),
         ))
     } else {
         None
     }
 }
+
+// flake8-builtins
+pub enum ShadowingType {
+    Variable,
+    Argument,
+    Attribute,
+}
+
+/// Check builtin name shadowing
+pub fn check_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
+    }
+}
+
+/// Returns `true` if a call is an argumented `super` invocation.
+pub fn is_super_call_with_arguments(func: &Expr, args: &Vec<Expr>) -> bool {
+    // Check: is this a `super` call?
+    if let ExprKind::Name { id, .. } = &func.node {
+        id == "super" && !args.is_empty()
+    } else {
+        false
+    }
+}
+
+// flake8-super
+/// Check that `super()` has no args
+pub fn check_super_args(
+    scope: &Scope,
+    parents: &[&Stmt],
+    expr: &Expr,
+    func: &Expr,
+    args: &Vec<Expr>,
+) -> Option<Check> {
+    if !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.as_slice() {
+        // 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
+}
+
+// flake8-print
+/// Check whether a function call is a `print` or `pprint` invocation
+pub fn check_print_call(expr: &Expr, func: &Expr) -> Option<Check> {
+    if let ExprKind::Name { id, .. } = &func.node {
+        if id == "print" {
+            return Some(Check::new(CheckKind::PrintFound, Range::from_located(expr)));
+        } else if 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 id == "pprint" && attr == "pprint" {
+                return Some(Check::new(
+                    CheckKind::PPrintFound,
+                    Range::from_located(expr),
+                ));
+            }
+        }
+    }
+
+    None
+}

src/ast/operations.rs

@@ -1,6 +1,6 @@
 use rustpython_parser::ast::{Constant, Expr, ExprKind, Location, Stmt, StmtKind};
 
-use crate::ast::types::{BindingKind, Scope};
+use crate::ast::types::{BindingKind, Range, Scope};
 
 /// Extract the names bound to a given __all__ assignment.
 pub fn extract_all_names(stmt: &Stmt, scope: &Scope) -> Vec<String> {
@@ -134,7 +134,7 @@ impl<'a> SourceCodeLocator<'a> {
         }
     }
 
-    pub fn slice_source_code(&mut self, location: &Location) -> &'a str {
+    pub fn slice_source_code_at(&mut self, location: &Location) -> &'a str {
         if !self.initialized {
             let mut offset = 0;
             for i in self.content.lines() {
@@ -147,4 +147,19 @@ impl<'a> SourceCodeLocator<'a> {
         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 {
+        if !self.initialized {
+            let mut offset = 0;
+            for i in self.content.lines() {
+                self.offsets.push(offset);
+                offset += i.len();
+                offset += 1;
+            }
+            self.initialized = true;
+        }
+        let 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]
+    }
 }

src/ast/relocate.rs

@@ -1,13 +1,17 @@
-use rustpython_parser::ast::{Expr, ExprKind, Keyword, Location};
+use rustpython_parser::ast::{Expr, ExprKind, Keyword};
 
-fn relocate_keyword(keyword: &mut Keyword, location: Location) {
-    keyword.location = location;
+use crate::ast::types::Range;
+
+fn relocate_keyword(keyword: &mut Keyword, location: Range) {
+    keyword.location = location.location;
+    keyword.end_location = 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: Location) {
-    expr.location = location;
+pub fn relocate_expr(expr: &mut Expr, location: Range) {
+    expr.location = location.location;
+    expr.end_location = location.end_location;
     match &mut expr.node {
         ExprKind::BoolOp { values, .. } => {
             for expr in values {

src/ast/types.rs

@@ -1,13 +1,28 @@
 use std::collections::BTreeMap;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
-use rustpython_parser::ast::Location;
+use rustpython_parser::ast::{Located, Location};
 
 fn id() -> usize {
     static COUNTER: AtomicUsize = AtomicUsize::new(1);
     COUNTER.fetch_add(1, Ordering::Relaxed)
 }
 
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Range {
+    pub location: Location,
+    pub end_location: Location,
+}
+
+impl Range {
+    pub fn from_located<T>(located: &Located<T>) -> Self {
+        Range {
+            location: located.location,
+            end_location: located.end_location,
+        }
+    }
+}
+
 #[derive(Clone, Debug, Default)]
 pub struct FunctionScope {
     pub uses_locals: bool,
@@ -40,6 +55,12 @@ impl Scope {
     }
 }
 
+#[derive(Clone, Debug)]
+pub struct BindingContext {
+    pub defined_by: usize,
+    pub defined_in: Option<usize>,
+}
+
 #[derive(Clone, Debug)]
 pub enum BindingKind {
     Annotation,
@@ -52,20 +73,27 @@ pub enum BindingKind {
     Definition,
     Export(Vec<String>),
     FutureImportation,
-    Importation(String),
     StarImportation,
-    SubmoduleImportation(String),
+    Importation(String, BindingContext),
+    FromImportation(String, BindingContext),
+    SubmoduleImportation(String, BindingContext),
 }
 
 #[derive(Clone, Debug)]
 pub struct Binding {
     pub kind: BindingKind,
-    pub location: Location,
-    /// Tuple of (scope index, location) indicating the scope and location at which the binding was
+    pub range: Range,
+    /// Tuple of (scope index, range) indicating the scope and range at which the binding was
     /// last used.
-    pub used: Option<(usize, Location)>,
+    pub used: Option<(usize, Range)>,
 }
 
 pub trait CheckLocator {
-    fn locate_check(&self, default: Location) -> Location;
+    fn locate_check(&self, default: Range) -> Range;
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub enum ImportKind {
+    Import,
+    ImportFrom,
 }

src/autofix/fixer.rs

@@ -2,6 +2,7 @@ use std::fs;
 use std::path::Path;
 
 use anyhow::Result;
+use itertools::Itertools;
 use rustpython_parser::ast::Location;
 
 use crate::checks::{Check, Fix};
@@ -43,41 +44,46 @@ fn apply_fixes<'a>(fixes: impl Iterator<Item = &'a mut Fix>, contents: &str) ->
     let mut output = "".to_string();
     let mut last_pos: Location = Location::new(0, 0);
 
-    for fix in fixes {
+    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.start {
+        if last_pos > fix.location {
             continue;
         }
 
-        if fix.start.row() > last_pos.row() {
+        if fix.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.start.row() - 1] {
+            for line in &lines[last_pos.row()..fix.location.row() - 1] {
                 output.push_str(line);
                 output.push('\n');
             }
-            output.push_str(&lines[fix.start.row() - 1][..fix.start.column() - 1]);
+            output.push_str(&lines[fix.location.row() - 1][..fix.location.column() - 1]);
             output.push_str(&fix.content);
         } else {
             output.push_str(
-                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.start.column() - 1],
+                &lines[last_pos.row() - 1][last_pos.column() - 1..fix.location.column() - 1],
             );
             output.push_str(&fix.content);
         }
 
-        last_pos = fix.end;
+        last_pos = fix.end_location;
         fix.applied = true;
     }
 
-    if last_pos.row() > 0 || last_pos.column() > 0 {
+    if last_pos.row() > 0
+        && (last_pos.row() - 1) < lines.len()
+        && (last_pos.row() > 0 || last_pos.column() > 0)
+    {
         output.push_str(&lines[last_pos.row() - 1][last_pos.column() - 1..]);
         output.push('\n');
     }
-    for line in &lines[last_pos.row()..] {
-        output.push_str(line);
-        output.push('\n');
+    if last_pos.row() < lines.len() {
+        for line in &lines[last_pos.row()..] {
+            output.push_str(line);
+            output.push('\n');
+        }
     }
 
     output
@@ -106,8 +112,8 @@ mod tests {
     fn apply_single_replacement() -> Result<()> {
         let mut fixes = vec![Fix {
             content: "Bar".to_string(),
-            start: Location::new(1, 9),
-            end: Location::new(1, 15),
+            location: Location::new(1, 9),
+            end_location: Location::new(1, 15),
             applied: false,
         }];
         let actual = apply_fixes(
@@ -130,8 +136,8 @@ mod tests {
     fn apply_single_removal() -> Result<()> {
         let mut fixes = vec![Fix {
             content: "".to_string(),
-            start: Location::new(1, 8),
-            end: Location::new(1, 16),
+            location: Location::new(1, 8),
+            end_location: Location::new(1, 16),
             applied: false,
         }];
         let actual = apply_fixes(
@@ -155,14 +161,14 @@ mod tests {
         let mut fixes = vec![
             Fix {
                 content: "".to_string(),
-                start: Location::new(1, 8),
-                end: Location::new(1, 17),
+                location: Location::new(1, 8),
+                end_location: Location::new(1, 17),
                 applied: false,
             },
             Fix {
                 content: "".to_string(),
-                start: Location::new(1, 17),
-                end: Location::new(1, 24),
+                location: Location::new(1, 17),
+                end_location: Location::new(1, 24),
                 applied: false,
             },
         ];
@@ -187,14 +193,14 @@ mod tests {
         let mut fixes = vec![
             Fix {
                 content: "".to_string(),
-                start: Location::new(1, 8),
-                end: Location::new(1, 16),
+                location: Location::new(1, 8),
+                end_location: Location::new(1, 16),
                 applied: false,
             },
             Fix {
                 content: "ignored".to_string(),
-                start: Location::new(1, 10),
-                end: Location::new(1, 12),
+                location: Location::new(1, 10),
+                end_location: Location::new(1, 12),
                 applied: false,
             },
         ];

src/autofix/fixes.rs

@@ -1,8 +1,14 @@
-use rustpython_parser::ast::{Expr, Keyword, Location};
+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.
@@ -25,7 +31,7 @@ pub fn remove_class_def_base(
     bases: &[Expr],
     keywords: &[Keyword],
 ) -> Option<Fix> {
-    let content = locator.slice_source_code(stmt_at);
+    let content = locator.slice_source_code_at(stmt_at);
 
     // Case 1: `object` is the only base.
     if bases.len() == 1 && keywords.is_empty() {
@@ -52,8 +58,8 @@ pub fn remove_class_def_base(
         return match (fix_start, fix_end) {
             (Some(start), Some(end)) => Some(Fix {
                 content: "".to_string(),
-                start,
-                end,
+                location: start,
+                end_location: end,
                 applied: false,
             }),
             _ => None,
@@ -91,8 +97,8 @@ pub fn remove_class_def_base(
         match (fix_start, fix_end) {
             (Some(start), Some(end)) => Some(Fix {
                 content: "".to_string(),
-                start,
-                end,
+                location: start,
+                end_location: end,
                 applied: false,
             }),
             _ => None,
@@ -116,11 +122,271 @@ pub fn remove_class_def_base(
         match (fix_start, fix_end) {
             (Some(start), Some(end)) => Some(Fix {
                 content: "".to_string(),
-                start,
-                end,
+                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,
+        })
+    }
+}

src/check_lines.rs

@@ -1,5 +1,6 @@
 use std::collections::BTreeMap;
 
+use crate::ast::types::Range;
 use rustpython_parser::ast::Location;
 
 use crate::autofix::fixer;
@@ -31,8 +32,8 @@ pub fn check_lines(
     settings: &Settings,
     autofix: &fixer::Mode,
 ) {
-    let enforce_line_too_long = settings.select.contains(&CheckCode::E501);
-    let enforce_noqa = settings.select.contains(&CheckCode::M001);
+    let enforce_line_too_long = settings.enabled.contains(&CheckCode::E501);
+    let enforce_noqa = settings.enabled.contains(&CheckCode::M001);
 
     let mut noqa_directives: BTreeMap<usize, (Directive, Vec<&str>)> = BTreeMap::new();
 
@@ -64,11 +65,11 @@ pub fn check_lines(
                     .or_insert_with(|| (noqa::extract_noqa_directive(lines[noqa_lineno]), vec![]));
 
                 match noqa {
-                    (Directive::All(_), matches) => {
+                    (Directive::All(_, _), matches) => {
                         matches.push(check.kind.code().as_str());
                         ignored.push(index)
                     }
-                    (Directive::Codes(_, codes), matches) => {
+                    (Directive::Codes(_, _, codes), matches) => {
                         if codes.contains(&check.kind.code().as_str()) {
                             matches.push(check.kind.code().as_str());
                             ignored.push(index);
@@ -89,14 +90,17 @@ pub fn check_lines(
 
                 let check = Check::new(
                     CheckKind::LineTooLong(line_length, settings.line_length),
-                    Location::new(lineno + 1, settings.line_length + 1),
+                    Range {
+                        location: Location::new(lineno + 1, 1),
+                        end_location: Location::new(lineno + 1, line_length + 1),
+                    },
                 );
 
                 match noqa {
-                    (Directive::All(_), matches) => {
+                    (Directive::All(_, _), matches) => {
                         matches.push(check.kind.code().as_str());
                     }
-                    (Directive::Codes(_, codes), matches) => {
+                    (Directive::Codes(_, _, codes), matches) => {
                         if codes.contains(&check.kind.code().as_str()) {
                             matches.push(check.kind.code().as_str());
                         } else {
@@ -113,24 +117,30 @@ pub fn check_lines(
     if enforce_noqa {
         for (row, (directive, matches)) in noqa_directives {
             match directive {
-                Directive::All(column) => {
+                Directive::All(start, end) => {
                     if matches.is_empty() {
                         let mut check = Check::new(
                             CheckKind::UnusedNOQA(None),
-                            Location::new(row + 1, column + 1),
+                            Range {
+                                location: Location::new(row + 1, start + 1),
+                                end_location: Location::new(row + 1, end + 1),
+                            },
                         );
                         if matches!(autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
                             check.amend(Fix {
                                 content: "".to_string(),
-                                start: Location::new(row + 1, column + 1),
-                                end: Location::new(row + 1, lines[row].chars().count() + 1),
+                                location: Location::new(row + 1, start + 1),
+                                end_location: Location::new(
+                                    row + 1,
+                                    lines[row].chars().count() + 1,
+                                ),
                                 applied: false,
                             });
                         }
                         line_checks.push(check);
                     }
                 }
-                Directive::Codes(column, codes) => {
+                Directive::Codes(start, end, codes) => {
                     let mut invalid_codes = vec![];
                     let mut valid_codes = vec![];
                     for code in codes {
@@ -144,21 +154,30 @@ pub fn check_lines(
                     if !invalid_codes.is_empty() {
                         let mut check = Check::new(
                             CheckKind::UnusedNOQA(Some(invalid_codes.join(", "))),
-                            Location::new(row + 1, column + 1),
+                            Range {
+                                location: Location::new(row + 1, start + 1),
+                                end_location: Location::new(row + 1, end + 1),
+                            },
                         );
                         if matches!(autofix, fixer::Mode::Generate | fixer::Mode::Apply) {
                             if valid_codes.is_empty() {
                                 check.amend(Fix {
                                     content: "".to_string(),
-                                    start: Location::new(row + 1, column + 1),
-                                    end: Location::new(row + 1, lines[row].chars().count() + 1),
+                                    location: Location::new(row + 1, start + 1),
+                                    end_location: Location::new(
+                                        row + 1,
+                                        lines[row].chars().count() + 1,
+                                    ),
                                     applied: false,
                                 });
                             } else {
                                 check.amend(Fix {
                                     content: format!("  # noqa: {}", valid_codes.join(", ")),
-                                    start: Location::new(row + 1, column + 1),
-                                    end: Location::new(row + 1, lines[row].chars().count() + 1),
+                                    location: Location::new(row + 1, start + 1),
+                                    end_location: Location::new(
+                                        row + 1,
+                                        lines[row].chars().count() + 1,
+                                    ),
                                     applied: false,
                                 });
                             }

src/checks.rs

@@ -1,10 +1,13 @@
 use std::str::FromStr;
 
+use crate::ast::types::Range;
 use anyhow::Result;
+use itertools::Itertools;
 use rustpython_parser::ast::Location;
 use serde::{Deserialize, Serialize};
 
 pub const DEFAULT_CHECK_CODES: [CheckCode; 42] = [
+    // pycodestyle
     CheckCode::E402,
     CheckCode::E501,
     CheckCode::E711,
@@ -19,6 +22,7 @@ pub const DEFAULT_CHECK_CODES: [CheckCode; 42] = [
     CheckCode::E743,
     CheckCode::E902,
     CheckCode::E999,
+    // pyflakes
     CheckCode::F401,
     CheckCode::F402,
     CheckCode::F403,
@@ -49,7 +53,8 @@ pub const DEFAULT_CHECK_CODES: [CheckCode; 42] = [
     CheckCode::F901,
 ];
 
-pub const ALL_CHECK_CODES: [CheckCode; 45] = [
+pub const ALL_CHECK_CODES: [CheckCode; 52] = [
+    // pycodestyle
     CheckCode::E402,
     CheckCode::E501,
     CheckCode::E711,
@@ -64,6 +69,7 @@ pub const ALL_CHECK_CODES: [CheckCode; 45] = [
     CheckCode::E743,
     CheckCode::E902,
     CheckCode::E999,
+    // pyflakes
     CheckCode::F401,
     CheckCode::F402,
     CheckCode::F403,
@@ -92,13 +98,27 @@ pub const ALL_CHECK_CODES: [CheckCode; 45] = [
     CheckCode::F831,
     CheckCode::F841,
     CheckCode::F901,
-    CheckCode::M001,
+    // flake8-builtins
+    CheckCode::A001,
+    CheckCode::A002,
+    CheckCode::A003,
+    // flake8-super
+    CheckCode::SPR001,
+    // flake8-print
+    CheckCode::T201,
+    CheckCode::T203,
+    // pyupgrade
+    CheckCode::U001,
+    // Refactor
     CheckCode::R001,
     CheckCode::R002,
+    // Meta
+    CheckCode::M001,
 ];
 
 #[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize, Hash, PartialOrd, Ord)]
 pub enum CheckCode {
+    // pycodestyle
     E402,
     E501,
     E711,
@@ -113,6 +133,7 @@ pub enum CheckCode {
     E743,
     E902,
     E999,
+    // pyflakes
     F401,
     F402,
     F403,
@@ -141,8 +162,21 @@ pub enum CheckCode {
     F831,
     F841,
     F901,
+    // flake8-builtins
+    A001,
+    A002,
+    A003,
+    // flake8-super
+    SPR001,
+    // flake8-print
+    T201,
+    T203,
+    // pyupgrade
+    U001,
+    // Refactor
     R001,
     R002,
+    // Meta
     M001,
 }
 
@@ -151,6 +185,7 @@ impl FromStr for CheckCode {
 
     fn from_str(s: &str) -> Result<Self> {
         match s {
+            // pycodestyle
             "E402" => Ok(CheckCode::E402),
             "E501" => Ok(CheckCode::E501),
             "E711" => Ok(CheckCode::E711),
@@ -165,6 +200,7 @@ impl FromStr for CheckCode {
             "E743" => Ok(CheckCode::E743),
             "E902" => Ok(CheckCode::E902),
             "E999" => Ok(CheckCode::E999),
+            // pyflakes
             "F401" => Ok(CheckCode::F401),
             "F402" => Ok(CheckCode::F402),
             "F403" => Ok(CheckCode::F403),
@@ -193,8 +229,18 @@ impl FromStr for CheckCode {
             "F831" => Ok(CheckCode::F831),
             "F841" => Ok(CheckCode::F841),
             "F901" => Ok(CheckCode::F901),
+            // flake8-builtins
+            "A001" => Ok(CheckCode::A001),
+            "A002" => Ok(CheckCode::A002),
+            "A003" => Ok(CheckCode::A003),
+            // flake8-super
+            "SPR001" => Ok(CheckCode::SPR001),
+            // pyupgrade
+            "U001" => Ok(CheckCode::U001),
+            // Refactor
             "R001" => Ok(CheckCode::R001),
             "R002" => Ok(CheckCode::R002),
+            // Meta
             "M001" => Ok(CheckCode::M001),
             _ => Err(anyhow::anyhow!("Unknown check code: {s}")),
         }
@@ -204,6 +250,7 @@ impl FromStr for CheckCode {
 impl CheckCode {
     pub fn as_str(&self) -> &str {
         match self {
+            // pycodestyle
             CheckCode::E402 => "E402",
             CheckCode::E501 => "E501",
             CheckCode::E711 => "E711",
@@ -218,6 +265,7 @@ impl CheckCode {
             CheckCode::E743 => "E743",
             CheckCode::E902 => "E902",
             CheckCode::E999 => "E999",
+            // pyflakes
             CheckCode::F401 => "F401",
             CheckCode::F402 => "F402",
             CheckCode::F403 => "F403",
@@ -246,8 +294,21 @@ impl CheckCode {
             CheckCode::F831 => "F831",
             CheckCode::F841 => "F841",
             CheckCode::F901 => "F901",
+            // flake8-builtins
+            CheckCode::A001 => "A001",
+            CheckCode::A002 => "A002",
+            CheckCode::A003 => "A003",
+            // flake8-super
+            CheckCode::SPR001 => "SPR001",
+            // flake8-print
+            CheckCode::T201 => "T201",
+            CheckCode::T203 => "T203",
+            // pyupgrade
+            CheckCode::U001 => "U001",
+            // Refactor
             CheckCode::R001 => "R001",
             CheckCode::R002 => "R002",
+            // Meta
             CheckCode::M001 => "M001",
         }
     }
@@ -264,6 +325,7 @@ impl CheckCode {
     /// A placeholder representation of the CheckKind for the check.
     pub fn kind(&self) -> CheckKind {
         match self {
+            // pycodestyle
             CheckCode::E402 => CheckKind::ModuleImportNotAtTopOfFile,
             CheckCode::E501 => CheckKind::LineTooLong(89, 88),
             CheckCode::E711 => CheckKind::NoneComparison(RejectedCmpop::Eq),
@@ -276,19 +338,22 @@ impl CheckCode {
             CheckCode::E741 => CheckKind::AmbiguousVariableName("...".to_string()),
             CheckCode::E742 => CheckKind::AmbiguousClassName("...".to_string()),
             CheckCode::E743 => CheckKind::AmbiguousFunctionName("...".to_string()),
-            CheckCode::E902 => CheckKind::IOError("...".to_string()),
-            CheckCode::E999 => CheckKind::SyntaxError("...".to_string()),
+            CheckCode::E902 => CheckKind::IOError("IOError: `...`".to_string()),
+            CheckCode::E999 => CheckKind::SyntaxError("`...`".to_string()),
+            // pyflakes
             CheckCode::F401 => CheckKind::UnusedImport("...".to_string()),
             CheckCode::F402 => CheckKind::ImportShadowedByLoopVar("...".to_string(), 1),
             CheckCode::F403 => CheckKind::ImportStarUsed("...".to_string()),
             CheckCode::F404 => CheckKind::LateFutureImport,
-            CheckCode::F405 => CheckKind::ImportStarUsage("...".to_string(), "...".to_string()),
+            CheckCode::F405 => {
+                CheckKind::ImportStarUsage("...".to_string(), vec!["...".to_string()])
+            }
             CheckCode::F406 => CheckKind::ImportStarNotPermitted("...".to_string()),
             CheckCode::F407 => CheckKind::FutureFeatureNotDefined("...".to_string()),
             CheckCode::F541 => CheckKind::FStringMissingPlaceholders,
             CheckCode::F601 => CheckKind::MultiValueRepeatedKeyLiteral,
             CheckCode::F602 => CheckKind::MultiValueRepeatedKeyVariable("...".to_string()),
-            CheckCode::F621 => CheckKind::TooManyExpressionsInStarredAssignment,
+            CheckCode::F621 => CheckKind::ExpressionsInStarAssignment,
             CheckCode::F622 => CheckKind::TwoStarredExpressions,
             CheckCode::F631 => CheckKind::AssertTuple,
             CheckCode::F632 => CheckKind::IsLiteral,
@@ -306,9 +371,22 @@ impl CheckCode {
             CheckCode::F831 => CheckKind::DuplicateArgumentName,
             CheckCode::F841 => CheckKind::UnusedVariable("...".to_string()),
             CheckCode::F901 => CheckKind::RaiseNotImplemented,
-            CheckCode::M001 => CheckKind::UnusedNOQA(None),
+            // flake8-builtins
+            CheckCode::A001 => CheckKind::BuiltinVariableShadowing("...".to_string()),
+            CheckCode::A002 => CheckKind::BuiltinArgumentShadowing("...".to_string()),
+            CheckCode::A003 => CheckKind::BuiltinAttributeShadowing("...".to_string()),
+            // flake8-super
+            CheckCode::SPR001 => CheckKind::SuperCallWithParameters,
+            // flake8-print
+            CheckCode::T201 => CheckKind::PrintFound,
+            CheckCode::T203 => CheckKind::PPrintFound,
+            // pyupgrade
+            CheckCode::U001 => CheckKind::UselessMetaclassType,
+            // Refactor
             CheckCode::R001 => CheckKind::UselessObjectInheritance("...".to_string()),
             CheckCode::R002 => CheckKind::NoAssertEquals,
+            // Meta
+            CheckCode::M001 => CheckKind::UnusedNOQA(None),
         }
     }
 }
@@ -328,7 +406,6 @@ pub enum RejectedCmpop {
 
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub enum CheckKind {
-    UnusedNOQA(Option<String>),
     AmbiguousClassName(String),
     AmbiguousFunctionName(String),
     AmbiguousVariableName(String),
@@ -339,14 +416,15 @@ pub enum CheckKind {
     DoNotAssignLambda,
     DoNotUseBareExcept,
     DuplicateArgumentName,
-    ForwardAnnotationSyntaxError(String),
+    ExpressionsInStarAssignment,
     FStringMissingPlaceholders,
+    ForwardAnnotationSyntaxError(String),
     FutureFeatureNotDefined(String),
     IOError(String),
     IfTuple,
     ImportShadowedByLoopVar(String, usize),
     ImportStarNotPermitted(String),
-    ImportStarUsage(String, String),
+    ImportStarUsage(String, Vec<String>),
     ImportStarUsed(String),
     InvalidPrintSyntax,
     IsLiteral,
@@ -362,7 +440,6 @@ pub enum CheckKind {
     RaiseNotImplemented,
     ReturnOutsideFunction,
     SyntaxError(String),
-    TooManyExpressionsInStarredAssignment,
     TrueFalseComparison(bool, RejectedCmpop),
     TwoStarredExpressions,
     TypeComparison,
@@ -370,9 +447,20 @@ pub enum CheckKind {
     UndefinedLocal(String),
     UndefinedName(String),
     UnusedImport(String),
+    UnusedNOQA(Option<String>),
     UnusedVariable(String),
+    UselessMetaclassType,
     UselessObjectInheritance(String),
     YieldOutsideFunction,
+    // flake8-builtin
+    BuiltinVariableShadowing(String),
+    BuiltinArgumentShadowing(String),
+    BuiltinAttributeShadowing(String),
+    // flake8-super
+    SuperCallWithParameters,
+    // flake8-print
+    PrintFound,
+    PPrintFound,
 }
 
 impl CheckKind {
@@ -389,6 +477,7 @@ impl CheckKind {
             CheckKind::DoNotAssignLambda => "DoNotAssignLambda",
             CheckKind::DoNotUseBareExcept => "DoNotUseBareExcept",
             CheckKind::DuplicateArgumentName => "DuplicateArgumentName",
+            CheckKind::ExpressionsInStarAssignment => "ExpressionsInStarAssignment",
             CheckKind::FStringMissingPlaceholders => "FStringMissingPlaceholders",
             CheckKind::ForwardAnnotationSyntaxError(_) => "ForwardAnnotationSyntaxError",
             CheckKind::FutureFeatureNotDefined(_) => "FutureFeatureNotDefined",
@@ -405,16 +494,12 @@ impl CheckKind {
             CheckKind::ModuleImportNotAtTopOfFile => "ModuleImportNotAtTopOfFile",
             CheckKind::MultiValueRepeatedKeyLiteral => "MultiValueRepeatedKeyLiteral",
             CheckKind::MultiValueRepeatedKeyVariable(_) => "MultiValueRepeatedKeyVariable",
-            CheckKind::NoAssertEquals => "NoAssertEquals",
             CheckKind::NoneComparison(_) => "NoneComparison",
             CheckKind::NotInTest => "NotInTest",
             CheckKind::NotIsTest => "NotIsTest",
             CheckKind::RaiseNotImplemented => "RaiseNotImplemented",
             CheckKind::ReturnOutsideFunction => "ReturnOutsideFunction",
             CheckKind::SyntaxError(_) => "SyntaxError",
-            CheckKind::TooManyExpressionsInStarredAssignment => {
-                "TooManyExpressionsInStarredAssignment"
-            }
             CheckKind::TrueFalseComparison(_, _) => "TrueFalseComparison",
             CheckKind::TwoStarredExpressions => "TwoStarredExpressions",
             CheckKind::TypeComparison => "TypeComparison",
@@ -423,8 +508,22 @@ impl CheckKind {
             CheckKind::UndefinedName(_) => "UndefinedName",
             CheckKind::UnusedImport(_) => "UnusedImport",
             CheckKind::UnusedVariable(_) => "UnusedVariable",
-            CheckKind::UselessObjectInheritance(_) => "UselessObjectInheritance",
             CheckKind::YieldOutsideFunction => "YieldOutsideFunction",
+            // flake8-builtins
+            CheckKind::BuiltinVariableShadowing(_) => "BuiltinVariableShadowing",
+            CheckKind::BuiltinArgumentShadowing(_) => "BuiltinArgumentShadowing",
+            CheckKind::BuiltinAttributeShadowing(_) => "BuiltinAttributeShadowing",
+            // flake8-super
+            CheckKind::SuperCallWithParameters => "SuperCallWithParameters",
+            // flake8-print
+            CheckKind::PrintFound => "PrintFound",
+            CheckKind::PPrintFound => "PPrintFound",
+            // pyupgrade
+            CheckKind::UselessMetaclassType => "UselessMetaclassType",
+            // Refactor
+            CheckKind::NoAssertEquals => "NoAssertEquals",
+            CheckKind::UselessObjectInheritance(_) => "UselessObjectInheritance",
+            // Meta
             CheckKind::UnusedNOQA(_) => "UnusedNOQA",
         }
     }
@@ -458,14 +557,13 @@ impl CheckKind {
             CheckKind::ModuleImportNotAtTopOfFile => &CheckCode::E402,
             CheckKind::MultiValueRepeatedKeyLiteral => &CheckCode::F601,
             CheckKind::MultiValueRepeatedKeyVariable(_) => &CheckCode::F602,
-            CheckKind::NoAssertEquals => &CheckCode::R002,
             CheckKind::NoneComparison(_) => &CheckCode::E711,
             CheckKind::NotInTest => &CheckCode::E713,
             CheckKind::NotIsTest => &CheckCode::E714,
             CheckKind::RaiseNotImplemented => &CheckCode::F901,
             CheckKind::ReturnOutsideFunction => &CheckCode::F706,
             CheckKind::SyntaxError(_) => &CheckCode::E999,
-            CheckKind::TooManyExpressionsInStarredAssignment => &CheckCode::F621,
+            CheckKind::ExpressionsInStarAssignment => &CheckCode::F621,
             CheckKind::TrueFalseComparison(_, _) => &CheckCode::E712,
             CheckKind::TwoStarredExpressions => &CheckCode::F622,
             CheckKind::TypeComparison => &CheckCode::E721,
@@ -473,10 +571,24 @@ impl CheckKind {
             CheckKind::UndefinedLocal(_) => &CheckCode::F823,
             CheckKind::UndefinedName(_) => &CheckCode::F821,
             CheckKind::UnusedImport(_) => &CheckCode::F401,
-            CheckKind::UnusedNOQA(_) => &CheckCode::M001,
             CheckKind::UnusedVariable(_) => &CheckCode::F841,
-            CheckKind::UselessObjectInheritance(_) => &CheckCode::R001,
             CheckKind::YieldOutsideFunction => &CheckCode::F704,
+            // flake8-builtins
+            CheckKind::BuiltinVariableShadowing(_) => &CheckCode::A001,
+            CheckKind::BuiltinArgumentShadowing(_) => &CheckCode::A002,
+            CheckKind::BuiltinAttributeShadowing(_) => &CheckCode::A003,
+            // flake8-super
+            CheckKind::SuperCallWithParameters => &CheckCode::SPR001,
+            // flake8-print
+            CheckKind::PrintFound => &CheckCode::T201,
+            CheckKind::PPrintFound => &CheckCode::T203,
+            // pyupgrade
+            CheckKind::UselessMetaclassType => &CheckCode::U001,
+            // Refactor
+            CheckKind::NoAssertEquals => &CheckCode::R002,
+            CheckKind::UselessObjectInheritance(_) => &CheckCode::R001,
+            // Meta
+            CheckKind::UnusedNOQA(_) => &CheckCode::M001,
         }
     }
 
@@ -484,13 +596,13 @@ impl CheckKind {
     pub fn body(&self) -> String {
         match self {
             CheckKind::AmbiguousClassName(name) => {
-                format!("ambiguous class name '{}'", name)
+                format!("Ambiguous class name: `{}`", name)
             }
             CheckKind::AmbiguousFunctionName(name) => {
-                format!("ambiguous function name '{}'", name)
+                format!("Ambiguous function name: `{}`", name)
             }
             CheckKind::AmbiguousVariableName(name) => {
-                format!("ambiguous variable name '{}'", name)
+                format!("Ambiguous variable name: `{}`", name)
             }
             CheckKind::AssertTuple => {
                 "Assert test is a non-empty tuple, which is always `True`".to_string()
@@ -498,7 +610,7 @@ impl CheckKind {
             CheckKind::BreakOutsideLoop => "`break` outside loop".to_string(),
             CheckKind::ContinueOutsideLoop => "`continue` not properly in loop".to_string(),
             CheckKind::DefaultExceptNotLast => {
-                "an `except:` block as not the last exception handler".to_string()
+                "An `except:` block as not the last exception handler".to_string()
             }
             CheckKind::DoNotAssignLambda => {
                 "Do not assign a lambda expression, use a def".to_string()
@@ -508,19 +620,21 @@ impl CheckKind {
                 "Duplicate argument name in function definition".to_string()
             }
             CheckKind::ForwardAnnotationSyntaxError(body) => {
-                format!("syntax error in forward annotation '{body}'")
+                format!("Syntax error in forward annotation: `{body}`")
             }
             CheckKind::FStringMissingPlaceholders => {
                 "f-string without any placeholders".to_string()
             }
             CheckKind::FutureFeatureNotDefined(name) => {
-                format!("future feature '{name}' is not defined")
+                format!("Future feature `{name}` is not defined")
             }
             CheckKind::IOError(message) => message.clone(),
             CheckKind::IfTuple => "If test is a tuple, which is always `True`".to_string(),
-            CheckKind::InvalidPrintSyntax => "use of >> is invalid with print function".to_string(),
+            CheckKind::InvalidPrintSyntax => {
+                "Use of `>>` is invalid with `print` function".to_string()
+            }
             CheckKind::ImportShadowedByLoopVar(name, line) => {
-                format!("import '{name}' from line {line} shadowed by loop variable")
+                format!("Import `{name}` from line {line} shadowed by loop variable")
             }
             CheckKind::ImportStarNotPermitted(name) => {
                 format!("`from {name} import *` only allowed at module level")
@@ -529,11 +643,15 @@ impl CheckKind {
                 format!("`from {name} import *` used; unable to detect undefined names")
             }
             CheckKind::ImportStarUsage(name, sources) => {
-                format!("'{name}' may be undefined, or defined from star imports: {sources}")
+                let sources = sources
+                    .iter()
+                    .map(|source| format!("`{}`", source))
+                    .join(", ");
+                format!("`{name}` may be undefined, or defined from star imports: {sources}")
             }
-            CheckKind::IsLiteral => "use ==/!= to compare constant literals".to_string(),
+            CheckKind::IsLiteral => "Use `==` and `!=` to compare constant literals".to_string(),
             CheckKind::LateFutureImport => {
-                "from __future__ imports must occur at the beginning of the file".to_string()
+                "`from __future__` imports must occur at the beginning of the file".to_string()
             }
             CheckKind::LineTooLong(length, limit) => {
                 format!("Line too long ({length} > {limit} characters)")
@@ -547,9 +665,6 @@ impl CheckKind {
             CheckKind::MultiValueRepeatedKeyVariable(name) => {
                 format!("Dictionary key `{name}` repeated")
             }
-            CheckKind::NoAssertEquals => {
-                "`assertEquals` is deprecated, use `assertEqual` instead".to_string()
-            }
             CheckKind::NoneComparison(op) => match op {
                 RejectedCmpop::Eq => "Comparison to `None` should be `cond is None`".to_string(),
                 RejectedCmpop::NotEq => {
@@ -562,11 +677,11 @@ impl CheckKind {
                 "`raise NotImplemented` should be `raise NotImplementedError`".to_string()
             }
             CheckKind::ReturnOutsideFunction => {
-                "a `return` statement outside of a function/method".to_string()
+                "`return` statement outside of a function/method".to_string()
             }
             CheckKind::SyntaxError(message) => format!("SyntaxError: {message}"),
-            CheckKind::TooManyExpressionsInStarredAssignment => {
-                "too many expressions in star-unpacking assignment".to_string()
+            CheckKind::ExpressionsInStarAssignment => {
+                "Too many expressions in star-unpacking assignment".to_string()
             }
             CheckKind::TrueFalseComparison(value, op) => match *value {
                 true => match op {
@@ -586,8 +701,8 @@ impl CheckKind {
                     }
                 },
             },
-            CheckKind::TwoStarredExpressions => "two starred expressions in assignment".to_string(),
-            CheckKind::TypeComparison => "do not compare types, use `isinstance()`".to_string(),
+            CheckKind::TwoStarredExpressions => "Two starred expressions in assignment".to_string(),
+            CheckKind::TypeComparison => "Do not compare types, use `isinstance()`".to_string(),
             CheckKind::UndefinedExport(name) => {
                 format!("Undefined name `{name}` in `__all__`")
             }
@@ -601,12 +716,37 @@ impl CheckKind {
             CheckKind::UnusedVariable(name) => {
                 format!("Local variable `{name}` is assigned to but never used")
             }
+            CheckKind::YieldOutsideFunction => {
+                "`yield` or `yield from` statement outside of a function/method".to_string()
+            }
+
+            // flake8-builtins
+            CheckKind::BuiltinVariableShadowing(name) => {
+                format!("Variable `{name}` is shadowing a python builtin")
+            }
+            CheckKind::BuiltinArgumentShadowing(name) => {
+                format!("Argument `{name}` is shadowing a python builtin")
+            }
+            CheckKind::BuiltinAttributeShadowing(name) => {
+                format!("Class attribute `{name}` is shadowing a python builtin")
+            }
+            // flake8-super
+            CheckKind::SuperCallWithParameters => {
+                "Use `super()` instead of `super(__class__, self)`".to_string()
+            }
+            // flake8-print
+            CheckKind::PrintFound => "`print` found".to_string(),
+            CheckKind::PPrintFound => "`pprint` found".to_string(),
+            // pyupgrade
+            CheckKind::UselessMetaclassType => "`__metaclass__ = type` is implied".to_string(),
+            // Refactor
+            CheckKind::NoAssertEquals => {
+                "`assertEquals` is deprecated, use `assertEqual` instead".to_string()
+            }
             CheckKind::UselessObjectInheritance(name) => {
                 format!("Class `{name}` inherits from object")
             }
-            CheckKind::YieldOutsideFunction => {
-                "a `yield` or `yield from` statement outside of a function/method".to_string()
-            }
+            // Meta
             CheckKind::UnusedNOQA(code) => match code {
                 None => "Unused `noqa` directive".to_string(),
                 Some(code) => format!("Unused `noqa` directive for: {code}"),
@@ -619,8 +759,13 @@ impl CheckKind {
         matches!(
             self,
             CheckKind::NoAssertEquals
-                | CheckKind::UselessObjectInheritance(_)
+                | CheckKind::PPrintFound
+                | CheckKind::PrintFound
+                | CheckKind::SuperCallWithParameters
+                | CheckKind::UnusedImport(_)
                 | CheckKind::UnusedNOQA(_)
+                | CheckKind::UselessMetaclassType
+                | CheckKind::UselessObjectInheritance(_)
         )
     }
 }
@@ -628,8 +773,8 @@ impl CheckKind {
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Fix {
     pub content: String,
-    pub start: Location,
-    pub end: Location,
+    pub location: Location,
+    pub end_location: Location,
     pub applied: bool,
 }
 
@@ -637,14 +782,16 @@ pub struct Fix {
 pub struct Check {
     pub kind: CheckKind,
     pub location: Location,
+    pub end_location: Location,
     pub fix: Option<Fix>,
 }
 
 impl Check {
-    pub fn new(kind: CheckKind, location: Location) -> Self {
+    pub fn new(kind: CheckKind, span: Range) -> Self {
         Self {
             kind,
-            location,
+            location: span.location,
+            end_location: span.end_location,
             fix: None,
         }
     }

src/fs.rs

@@ -76,7 +76,6 @@ pub fn iter_python_files<'a>(
         .all(|pattern| matches!(pattern, FilePattern::Simple(_)));
 
     WalkDir::new(normalize_path(path))
-        .follow_links(true)
         .into_iter()
         .filter_entry(move |entry| {
             if !has_exclude && !has_extend_exclude {
@@ -112,7 +111,9 @@ pub fn iter_python_files<'a>(
         })
         .filter(|entry| {
             entry.as_ref().map_or(true, |entry| {
-                (entry.depth() == 0 && !entry.file_type().is_dir()) || is_included(entry.path())
+                (entry.depth() == 0 || is_included(entry.path()))
+                    && !entry.file_type().is_dir()
+                    && !(entry.file_type().is_symlink() && entry.path().is_dir())
             })
         })
 }

src/lib.rs

@@ -1,4 +1,13 @@
-extern crate core;
+use std::path::Path;
+
+use anyhow::Result;
+use log::debug;
+use rustpython_parser::lexer::LexResult;
+
+use crate::autofix::fixer::Mode;
+use crate::linter::{check_path, tokenize};
+use crate::message::Message;
+use crate::settings::{RawSettings, Settings};
 
 mod ast;
 mod autofix;
@@ -6,6 +15,7 @@ pub mod cache;
 pub mod check_ast;
 mod check_lines;
 pub mod checks;
+pub mod code_gen;
 pub mod fs;
 pub mod linter;
 pub mod logging;
@@ -15,3 +25,50 @@ pub mod printer;
 pub mod pyproject;
 mod python;
 pub mod settings;
+
+/// Run ruff over Python source code directly.
+pub fn check(path: &Path, contents: &str) -> Result<Vec<Message>> {
+    // Find the project root and pyproject.toml.
+    let project_root = pyproject::find_project_root(&[path.to_path_buf()]);
+    match &project_root {
+        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);
+    match &pyproject {
+        Some(path) => debug!("Found pyproject.toml at: {:?}", path),
+        None => debug!("Unable to find pyproject.toml; using default settings..."),
+    };
+
+    let settings = Settings::from_raw(RawSettings::from_pyproject(pyproject, project_root)?);
+
+    // Tokenize once.
+    let tokens: Vec<LexResult> = tokenize(contents);
+
+    // Determine the noqa line for every line in the source.
+    let noqa_line_for = noqa::extract_noqa_line_for(&tokens);
+
+    // Generate checks.
+    let checks = check_path(
+        path,
+        contents,
+        tokens,
+        &noqa_line_for,
+        &settings,
+        &Mode::None,
+    )?;
+
+    // Convert to messages.
+    let messages: Vec<Message> = checks
+        .into_iter()
+        .map(|check| Message {
+            kind: check.kind,
+            fixed: check.fix.map(|fix| fix.applied).unwrap_or_default(),
+            location: check.location,
+            end_location: check.end_location,
+            filename: path.to_string_lossy().to_string(),
+        })
+        .collect();
+
+    Ok(messages)
+}

src/linter.rs

@@ -1,3 +1,4 @@
+use std::fs::write;
 use std::path::Path;
 
 use anyhow::Result;
@@ -5,18 +6,20 @@ use log::debug;
 use rustpython_parser::lexer::LexResult;
 use rustpython_parser::{lexer, parser};
 
+use crate::ast::types::Range;
 use crate::autofix::fixer;
 use crate::autofix::fixer::fix_file;
 use crate::check_ast::check_ast;
 use crate::check_lines::check_lines;
 use crate::checks::{Check, CheckCode, CheckKind, LintSource};
+use crate::code_gen::SourceGenerator;
 use crate::message::Message;
 use crate::noqa::add_noqa;
 use crate::settings::Settings;
 use crate::{cache, fs, noqa};
 
 /// Collect tokens up to and including the first error.
-fn tokenize(contents: &str) -> Vec<LexResult> {
+pub(crate) fn tokenize(contents: &str) -> Vec<LexResult> {
     let mut tokens: Vec<LexResult> = vec![];
     for tok in lexer::make_tokenizer(contents) {
         let is_err = tok.is_err();
@@ -28,7 +31,7 @@ fn tokenize(contents: &str) -> Vec<LexResult> {
     tokens
 }
 
-fn check_path(
+pub(crate) fn check_path(
     path: &Path,
     contents: &str,
     tokens: Vec<LexResult>,
@@ -41,7 +44,7 @@ fn check_path(
 
     // Run the AST-based checks.
     if settings
-        .select
+        .enabled
         .iter()
         .any(|check_code| matches!(check_code.lint_source(), LintSource::AST))
     {
@@ -50,10 +53,13 @@ fn check_path(
                 checks.extend(check_ast(&python_ast, contents, settings, autofix, path))
             }
             Err(parse_error) => {
-                if settings.select.contains(&CheckCode::E999) {
+                if settings.enabled.contains(&CheckCode::E999) {
                     checks.push(Check::new(
                         CheckKind::SyntaxError(parse_error.error.to_string()),
-                        parse_error.location,
+                        Range {
+                            location: parse_error.location,
+                            end_location: parse_error.location,
+                        },
                     ))
                 }
             }
@@ -115,6 +121,7 @@ pub fn lint_path(
             kind: check.kind,
             fixed: check.fix.map(|fix| fix.applied).unwrap_or_default(),
             location: check.location,
+            end_location: check.end_location,
             filename: path.to_string_lossy().to_string(),
         })
         .collect();
@@ -146,6 +153,22 @@ pub fn add_noqa_to_path(path: &Path, settings: &Settings) -> Result<usize> {
     add_noqa(&checks, &contents, &noqa_line_for, path)
 }
 
+pub fn autoformat_path(path: &Path) -> Result<()> {
+    // Read the file from disk.
+    let contents = fs::read_file(path)?;
+
+    // Tokenize once.
+    let tokens: Vec<LexResult> = tokenize(&contents);
+
+    // Generate the AST.
+    let python_ast = parser::parse_program_tokens(tokens, "<filename>")?;
+    let mut generator: SourceGenerator = Default::default();
+    generator.unparse_suite(&python_ast)?;
+    write(path, generator.generate()?)?;
+
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
     use std::path::Path;
@@ -726,4 +749,88 @@ mod tests {
         insta::assert_yaml_snapshot!(checks);
         Ok(())
     }
+
+    #[test]
+    fn a001() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/A001.py"),
+            &settings::Settings::for_rule(CheckCode::A001),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn a002() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/A002.py"),
+            &settings::Settings::for_rule(CheckCode::A002),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn a003() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/A003.py"),
+            &settings::Settings::for_rule(CheckCode::A003),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn spr001() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/SPR001.py"),
+            &settings::Settings::for_rule(CheckCode::SPR001),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn t201() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/T201.py"),
+            &settings::Settings::for_rule(CheckCode::T201),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn t203() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/T203.py"),
+            &settings::Settings::for_rule(CheckCode::T203),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
+
+    #[test]
+    fn u001() -> Result<()> {
+        let mut checks = check_path(
+            Path::new("./resources/test/fixtures/U001.py"),
+            &settings::Settings::for_rule(CheckCode::U001),
+            &fixer::Mode::Generate,
+        )?;
+        checks.sort_by_key(|check| check.location);
+        insta::assert_yaml_snapshot!(checks);
+        Ok(())
+    }
 }

src/main.rs

@@ -1,5 +1,3 @@
-extern crate core;
-
 use std::io;
 use std::path::{Path, PathBuf};
 use std::process::ExitCode;
@@ -25,9 +23,11 @@ use ::ruff::logging::set_up_logging;
 use ::ruff::message::Message;
 use ::ruff::printer::{Printer, SerializationFormat};
 use ::ruff::pyproject::{self, StrCheckCodePair};
+use ::ruff::settings::CurrentSettings;
 use ::ruff::settings::{FilePattern, PerFileIgnore, Settings};
 use ::ruff::tell_user;
-use ruff::settings::CurrentSettings;
+use ruff::linter::autoformat_path;
+use ruff::settings::RawSettings;
 
 const CARGO_PKG_NAME: &str = env!("CARGO_PKG_NAME");
 const CARGO_PKG_VERSION: &str = env!("CARGO_PKG_VERSION");
@@ -89,6 +89,9 @@ struct Cli {
     /// Enable automatic additions of noqa directives to failing lines.
     #[arg(long)]
     add_noqa: bool,
+    /// Enable automatic formatting.
+    #[arg(long)]
+    autoformat: bool,
     /// Regular expression matching the name of dummy variables.
     #[arg(long)]
     dummy_variable_rgx: Option<Regex>,
@@ -118,7 +121,7 @@ fn check_for_updates() {
     }
 }
 
-fn show_settings(settings: Settings) {
+fn show_settings(settings: RawSettings) {
     println!("{:#?}", CurrentSettings::from_settings(settings));
 }
 
@@ -167,11 +170,12 @@ fn run_once(
             }
             .unwrap_or_else(|(path, message)| {
                 if let Some(path) = path {
-                    if settings.select.contains(&CheckCode::E902) {
+                    if settings.enabled.contains(&CheckCode::E902) {
                         vec![Message {
                             kind: CheckKind::IOError(message),
                             fixed: false,
                             location: Default::default(),
+                            end_location: Default::default(),
                             filename: path.to_string_lossy().to_string(),
                         }]
                     } else {
@@ -223,6 +227,33 @@ fn add_noqa(files: &[PathBuf], settings: &Settings) -> Result<usize> {
     Ok(modifications)
 }
 
+fn autoformat(files: &[PathBuf], settings: &Settings) -> Result<usize> {
+    // Collect all the files to format.
+    let start = Instant::now();
+    let paths: Vec<DirEntry> = files
+        .iter()
+        .flat_map(|path| iter_python_files(path, &settings.exclude, &settings.extend_exclude))
+        .flatten()
+        .collect();
+    let duration = start.elapsed();
+    debug!("Identified files to lint in: {:?}", duration);
+
+    let start = Instant::now();
+    let modifications = paths
+        .par_iter()
+        .map(|entry| {
+            let path = entry.path();
+            autoformat_path(path)
+        })
+        .flatten()
+        .count();
+
+    let duration = start.elapsed();
+    debug!("Auto-formatted files in: {:?}", duration);
+
+    Ok(modifications)
+}
+
 fn inner_main() -> Result<ExitCode> {
     let cli = Cli::parse();
 
@@ -257,7 +288,7 @@ fn inner_main() -> Result<ExitCode> {
         .map(|pair| PerFileIgnore::new(pair, &project_root))
         .collect();
 
-    let mut settings = Settings::from_pyproject(pyproject, project_root)?;
+    let mut settings = RawSettings::from_pyproject(pyproject, project_root)?;
     if !exclude.is_empty() {
         settings.exclude = exclude;
     }
@@ -268,17 +299,16 @@ fn inner_main() -> Result<ExitCode> {
         settings.per_file_ignores = per_file_ignores;
     }
     if !cli.select.is_empty() {
-        settings.clear();
-        settings.select(cli.select);
+        settings.select = cli.select;
     }
     if !cli.extend_select.is_empty() {
-        settings.select(cli.extend_select);
+        settings.extend_select = cli.extend_select;
     }
     if !cli.ignore.is_empty() {
-        settings.ignore(&cli.ignore);
+        settings.ignore = cli.ignore;
     }
     if !cli.extend_ignore.is_empty() {
-        settings.ignore(&cli.extend_ignore);
+        settings.extend_ignore = cli.extend_ignore;
     }
     if let Some(dummy_variable_rgx) = cli.dummy_variable_rgx {
         settings.dummy_variable_rgx = dummy_variable_rgx;
@@ -288,15 +318,18 @@ fn inner_main() -> Result<ExitCode> {
         eprintln!("Error: specify --show-settings or show-files (not both).");
         return Ok(ExitCode::FAILURE);
     }
-    if cli.show_files {
-        show_files(&cli.files, &settings);
-        return Ok(ExitCode::SUCCESS);
-    }
     if cli.show_settings {
         show_settings(settings);
         return Ok(ExitCode::SUCCESS);
     }
 
+    let settings = Settings::from_raw(settings);
+
+    if cli.show_files {
+        show_files(&cli.files, &settings);
+        return Ok(ExitCode::SUCCESS);
+    }
+
     cache::init()?;
 
     let mut printer = Printer::new(cli.format, cli.verbose);
@@ -309,6 +342,10 @@ fn inner_main() -> Result<ExitCode> {
             eprintln!("Warning: --no-qa is not enabled in watch mode.");
         }
 
+        if cli.autoformat {
+            eprintln!("Warning: --autoformat is not enabled in watch mode.");
+        }
+
         if cli.format != SerializationFormat::Text {
             eprintln!("Warning: --format 'text' is used in watch mode.");
         }
@@ -352,6 +389,11 @@ fn inner_main() -> Result<ExitCode> {
         if modifications > 0 {
             println!("Added {modifications} noqa directives.");
         }
+    } else if cli.autoformat {
+        let modifications = autoformat(&cli.files, &settings)?;
+        if modifications > 0 {
+            println!("Formatted {modifications} files.");
+        }
     } else {
         let messages = run_once(&cli.files, &settings, !cli.no_cache, cli.fix)?;
         if !cli.quiet {

src/message.rs

@@ -14,6 +14,7 @@ pub struct Message {
     pub kind: CheckKind,
     pub fixed: bool,
     pub location: Location,
+    pub end_location: Location,
     pub filename: String,
 }
 
@@ -39,7 +40,6 @@ impl fmt::Display for Message {
             f,
             "{}{}{}{}{}{} {} {}",
             relativize_path(Path::new(&self.filename)).white().bold(),
-            // self.filename.white(),
             ":".cyan(),
             self.location.row(),
             ":".cyan(),

src/noqa.rs

@@ -19,8 +19,8 @@ static SPLIT_COMMA_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"[,\s]").expect
 #[derive(Debug)]
 pub enum Directive<'a> {
     None,
-    All(usize),
-    Codes(usize, Vec<&'a str>),
+    All(usize, usize),
+    Codes(usize, usize, Vec<&'a str>),
 }
 
 pub fn extract_noqa_directive(line: &str) -> Directive {
@@ -29,13 +29,14 @@ pub fn extract_noqa_directive(line: &str) -> Directive {
             Some(noqa) => match caps.name("codes") {
                 Some(codes) => Directive::Codes(
                     noqa.start(),
+                    noqa.end(),
                     SPLIT_COMMA_REGEX
                         .split(codes.as_str())
                         .map(|code| code.trim())
                         .filter(|code| !code.is_empty())
                         .collect(),
                 ),
-                None => Directive::All(noqa.start()),
+                None => Directive::All(noqa.start(), noqa.end()),
             },
             None => Directive::None,
         },
@@ -46,10 +47,9 @@ pub fn extract_noqa_directive(line: &str) -> Directive {
 pub fn extract_noqa_line_for(lxr: &[LexResult]) -> Vec<usize> {
     let mut noqa_line_for: Vec<usize> = vec![];
 
-    let mut last_is_string = false;
-    let mut last_seen = usize::MIN;
     let mut min_line = usize::MAX;
     let mut max_line = usize::MIN;
+    let mut in_string = false;
 
     for (start, tok, end) in lxr.iter().flatten() {
         if matches!(tok, Tok::EndOfFile) {
@@ -61,29 +61,20 @@ pub fn extract_noqa_line_for(lxr: &[LexResult]) -> Vec<usize> {
             max_line = max(max_line, start.row());
 
             // For now, we only care about preserving noqa directives across multi-line strings.
-            if last_is_string {
-                noqa_line_for.extend(vec![max_line; (max_line + 1) - min_line]);
-            } else {
-                for i in (min_line - 1)..(max_line) {
+            if in_string {
+                for i in (noqa_line_for.len())..(min_line - 1) {
                     noqa_line_for.push(i + 1);
                 }
+                noqa_line_for.extend(vec![max_line; (max_line + 1) - min_line]);
             }
 
             min_line = usize::MAX;
             max_line = usize::MIN;
         } else {
-            // Handle empty lines.
-            if start.row() > last_seen {
-                for i in last_seen..(start.row() - 1) {
-                    noqa_line_for.push(i + 1);
-                }
-            }
-
             min_line = min(min_line, start.row());
             max_line = max(max_line, end.row());
         }
-        last_seen = start.row();
-        last_is_string = matches!(tok, Tok::String { .. });
+        in_string = matches!(tok, Tok::String { .. });
     }
 
     noqa_line_for
@@ -133,8 +124,8 @@ fn add_noqa_inner(
                     Directive::None => {
                         output.push_str(line);
                     }
-                    Directive::All(start) => output.push_str(&line[..start]),
-                    Directive::Codes(start, _) => output.push_str(&line[..start]),
+                    Directive::All(start, _) => output.push_str(&line[..start]),
+                    Directive::Codes(start, _, _) => output.push_str(&line[..start]),
                 };
                 let codes: Vec<&str> = codes.iter().map(|code| code.as_str()).collect();
                 output.push_str("  # noqa: ");
@@ -161,6 +152,7 @@ pub fn add_noqa(
 
 #[cfg(test)]
 mod tests {
+    use crate::ast::types::Range;
     use anyhow::Result;
     use rustpython_parser::ast::Location;
     use rustpython_parser::lexer;
@@ -171,6 +163,8 @@ mod tests {
 
     #[test]
     fn extraction() -> Result<()> {
+        let empty: Vec<usize> = Default::default();
+
         let lxr: Vec<LexResult> = lexer::make_tokenizer(
             "x = 1
 y = 2
@@ -178,7 +172,7 @@ z = x + 1",
         )
         .collect();
         println!("{:?}", extract_noqa_line_for(&lxr));
-        assert_eq!(extract_noqa_line_for(&lxr), vec![1, 2, 3]);
+        assert_eq!(extract_noqa_line_for(&lxr), empty);
 
         let lxr: Vec<LexResult> = lexer::make_tokenizer(
             "
@@ -188,7 +182,7 @@ z = x + 1",
         )
         .collect();
         println!("{:?}", extract_noqa_line_for(&lxr));
-        assert_eq!(extract_noqa_line_for(&lxr), vec![1, 2, 3, 4]);
+        assert_eq!(extract_noqa_line_for(&lxr), empty);
 
         let lxr: Vec<LexResult> = lexer::make_tokenizer(
             "x = 1
@@ -198,7 +192,7 @@ z = x + 1
         )
         .collect();
         println!("{:?}", extract_noqa_line_for(&lxr));
-        assert_eq!(extract_noqa_line_for(&lxr), vec![1, 2, 3]);
+        assert_eq!(extract_noqa_line_for(&lxr), empty);
 
         let lxr: Vec<LexResult> = lexer::make_tokenizer(
             "x = 1
@@ -209,7 +203,7 @@ z = x + 1
         )
         .collect();
         println!("{:?}", extract_noqa_line_for(&lxr));
-        assert_eq!(extract_noqa_line_for(&lxr), vec![1, 2, 3, 4]);
+        assert_eq!(extract_noqa_line_for(&lxr), empty);
 
         let lxr: Vec<LexResult> = lexer::make_tokenizer(
             "x = '''abc
@@ -220,7 +214,28 @@ y = 2
 z = x + 1",
         )
         .collect();
-        assert_eq!(extract_noqa_line_for(&lxr), vec![4, 4, 4, 4, 5, 6]);
+        assert_eq!(extract_noqa_line_for(&lxr), vec![4, 4, 4, 4]);
+
+        let lxr: Vec<LexResult> = lexer::make_tokenizer(
+            "x = 1
+y = '''abc
+def
+ghi
+'''
+z = 2",
+        )
+        .collect();
+        assert_eq!(extract_noqa_line_for(&lxr), vec![1, 5, 5, 5, 5]);
+
+        let lxr: Vec<LexResult> = lexer::make_tokenizer(
+            "x = 1
+y = '''abc
+def
+ghi
+'''",
+        )
+        .collect();
+        assert_eq!(extract_noqa_line_for(&lxr), vec![1, 5, 5, 5, 5]);
 
         Ok(())
     }
@@ -236,7 +251,10 @@ z = x + 1",
 
         let checks = vec![Check::new(
             CheckKind::UnusedVariable("x".to_string()),
-            Location::new(1, 1),
+            Range {
+                location: Location::new(1, 1),
+                end_location: Location::new(1, 1),
+            },
         )];
         let contents = "x = 1";
         let noqa_line_for = vec![1];
@@ -247,11 +265,17 @@ z = x + 1",
         let checks = vec![
             Check::new(
                 CheckKind::AmbiguousVariableName("x".to_string()),
-                Location::new(1, 1),
+                Range {
+                    location: Location::new(1, 1),
+                    end_location: Location::new(1, 1),
+                },
             ),
             Check::new(
                 CheckKind::UnusedVariable("x".to_string()),
-                Location::new(1, 1),
+                Range {
+                    location: Location::new(1, 1),
+                    end_location: Location::new(1, 1),
+                },
             ),
         ];
         let contents = "x = 1  # noqa: E741";
@@ -263,11 +287,17 @@ z = x + 1",
         let checks = vec![
             Check::new(
                 CheckKind::AmbiguousVariableName("x".to_string()),
-                Location::new(1, 1),
+                Range {
+                    location: Location::new(1, 1),
+                    end_location: Location::new(1, 1),
+                },
             ),
             Check::new(
                 CheckKind::UnusedVariable("x".to_string()),
-                Location::new(1, 1),
+                Range {
+                    location: Location::new(1, 1),
+                    end_location: Location::new(1, 1),
+                },
             ),
         ];
         let contents = "x = 1  # noqa";

src/printer.rs

@@ -21,6 +21,7 @@ struct ExpandedMessage<'a> {
     message: String,
     fixed: bool,
     location: Location,
+    end_location: Location,
     filename: &'a String,
 }
 
@@ -55,6 +56,7 @@ impl Printer {
                                 message: m.kind.body(),
                                 fixed: m.fixed,
                                 location: m.location,
+                                end_location: m.end_location,
                                 filename: &m.filename,
                             })
                             .collect::<Vec<_>>()

src/pyproject.rs

@@ -29,10 +29,17 @@ pub fn load_config(pyproject: &Option<PathBuf>) -> Result<Config> {
 pub struct Config {
     pub line_length: Option<usize>,
     pub exclude: Option<Vec<String>>,
-    pub extend_exclude: Option<Vec<String>>,
+    #[serde(default)]
+    pub extend_exclude: Vec<String>,
     pub select: Option<Vec<CheckCode>>,
-    pub ignore: Option<Vec<CheckCode>>,
-    pub per_file_ignores: Option<Vec<StrCheckCodePair>>,
+    #[serde(default)]
+    pub extend_select: Vec<CheckCode>,
+    #[serde(default)]
+    pub ignore: Vec<CheckCode>,
+    #[serde(default)]
+    pub extend_ignore: Vec<CheckCode>,
+    #[serde(default)]
+    pub per_file_ignores: Vec<StrCheckCodePair>,
     pub dummy_variable_rgx: Option<String>,
 }
 
@@ -175,10 +182,12 @@ mod tests {
                 ruff: Some(Config {
                     line_length: None,
                     exclude: None,
-                    extend_exclude: None,
+                    extend_exclude: vec![],
                     select: None,
-                    ignore: None,
-                    per_file_ignores: None,
+                    extend_select: vec![],
+                    ignore: vec![],
+                    extend_ignore: vec![],
+                    per_file_ignores: vec![],
                     dummy_variable_rgx: None,
                 })
             })
@@ -197,10 +206,12 @@ line-length = 79
                 ruff: Some(Config {
                     line_length: Some(79),
                     exclude: None,
-                    extend_exclude: None,
+                    extend_exclude: vec![],
                     select: None,
-                    ignore: None,
-                    per_file_ignores: None,
+                    extend_select: vec![],
+                    ignore: vec![],
+                    extend_ignore: vec![],
+                    per_file_ignores: vec![],
                     dummy_variable_rgx: None,
                 })
             })
@@ -219,10 +230,12 @@ exclude = ["foo.py"]
                 ruff: Some(Config {
                     line_length: None,
                     exclude: Some(vec!["foo.py".to_string()]),
-                    extend_exclude: None,
+                    extend_exclude: vec![],
                     select: None,
-                    ignore: None,
-                    per_file_ignores: None,
+                    extend_select: vec![],
+                    ignore: vec![],
+                    extend_ignore: vec![],
+                    per_file_ignores: vec![],
                     dummy_variable_rgx: None,
                 })
             })
@@ -241,10 +254,12 @@ select = ["E501"]
                 ruff: Some(Config {
                     line_length: None,
                     exclude: None,
-                    extend_exclude: None,
+                    extend_exclude: vec![],
                     select: Some(vec![CheckCode::E501]),
-                    ignore: None,
-                    per_file_ignores: None,
+                    extend_select: vec![],
+                    ignore: vec![],
+                    extend_ignore: vec![],
+                    per_file_ignores: vec![],
                     dummy_variable_rgx: None,
                 })
             })
@@ -254,6 +269,7 @@ select = ["E501"]
             r#"
 [tool.black]
 [tool.ruff]
+extend-select = ["M001"]
 ignore = ["E501"]
 "#,
         )?;
@@ -263,10 +279,12 @@ ignore = ["E501"]
                 ruff: Some(Config {
                     line_length: None,
                     exclude: None,
-                    extend_exclude: None,
+                    extend_exclude: vec![],
                     select: None,
-                    ignore: Some(vec![CheckCode::E501]),
-                    per_file_ignores: None,
+                    extend_select: vec![CheckCode::M001],
+                    ignore: vec![CheckCode::E501],
+                    extend_ignore: vec![],
+                    per_file_ignores: vec![],
                     dummy_variable_rgx: None,
                 })
             })
@@ -325,14 +343,16 @@ other-attribute = 1
             Config {
                 line_length: Some(88),
                 exclude: None,
-                extend_exclude: Some(vec![
+                extend_exclude: vec![
                     "excluded.py".to_string(),
                     "migrations".to_string(),
                     "directory/also_excluded.py".to_string(),
-                ]),
+                ],
                 select: None,
-                ignore: None,
-                per_file_ignores: None,
+                extend_select: vec![],
+                ignore: vec![],
+                extend_ignore: vec![],
+                per_file_ignores: vec![],
                 dummy_variable_rgx: None,
             }
         );

src/settings.rs

@@ -51,56 +51,18 @@ impl PerFileIgnore {
 }
 
 #[derive(Debug)]
-pub struct Settings {
-    pub pyproject: Option<PathBuf>,
-    pub project_root: Option<PathBuf>,
-    pub line_length: usize,
+pub struct RawSettings {
+    pub dummy_variable_rgx: Regex,
     pub exclude: Vec<FilePattern>,
     pub extend_exclude: Vec<FilePattern>,
-    pub select: BTreeSet<CheckCode>,
+    pub extend_ignore: Vec<CheckCode>,
+    pub extend_select: Vec<CheckCode>,
+    pub ignore: Vec<CheckCode>,
+    pub line_length: usize,
     pub per_file_ignores: Vec<PerFileIgnore>,
-    pub dummy_variable_rgx: Regex,
-}
-
-impl Settings {
-    pub fn for_rule(check_code: CheckCode) -> Self {
-        Self {
-            pyproject: None,
-            project_root: None,
-            line_length: 88,
-            exclude: vec![],
-            extend_exclude: vec![],
-            select: BTreeSet::from([check_code]),
-            per_file_ignores: vec![],
-            dummy_variable_rgx: DEFAULT_DUMMY_VARIABLE_RGX.clone(),
-        }
-    }
-
-    pub fn for_rules(check_codes: Vec<CheckCode>) -> Self {
-        Self {
-            pyproject: None,
-            project_root: None,
-            line_length: 88,
-            exclude: vec![],
-            extend_exclude: vec![],
-            select: BTreeSet::from_iter(check_codes),
-            per_file_ignores: vec![],
-            dummy_variable_rgx: DEFAULT_DUMMY_VARIABLE_RGX.clone(),
-        }
-    }
-}
-
-impl Hash for Settings {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.line_length.hash(state);
-        self.dummy_variable_rgx.as_str().hash(state);
-        for value in self.select.iter() {
-            value.hash(state);
-        }
-        for value in self.per_file_ignores.iter() {
-            value.hash(state);
-        }
-    }
+    pub project_root: Option<PathBuf>,
+    pub pyproject: Option<PathBuf>,
+    pub select: Vec<CheckCode>,
 }
 
 static DEFAULT_EXCLUDE: Lazy<Vec<FilePattern>> = Lazy::new(|| {
@@ -130,14 +92,18 @@ static DEFAULT_EXCLUDE: Lazy<Vec<FilePattern>> = Lazy::new(|| {
 static DEFAULT_DUMMY_VARIABLE_RGX: Lazy<Regex> =
     Lazy::new(|| Regex::new("^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$").unwrap());
 
-impl Settings {
+impl RawSettings {
     pub fn from_pyproject(
         pyproject: Option<PathBuf>,
         project_root: Option<PathBuf>,
     ) -> Result<Self> {
         let config = load_config(&pyproject)?;
-        let mut settings = Settings {
-            line_length: config.line_length.unwrap_or(88),
+        Ok(RawSettings {
+            dummy_variable_rgx: match config.dummy_variable_rgx {
+                Some(pattern) => Regex::new(&pattern)
+                    .map_err(|e| anyhow!("Invalid dummy-variable-rgx value: {e}"))?,
+                None => DEFAULT_DUMMY_VARIABLE_RGX.clone(),
+            },
             exclude: config
                 .exclude
                 .map(|paths| {
@@ -149,54 +115,91 @@ impl Settings {
                 .unwrap_or_else(|| DEFAULT_EXCLUDE.clone()),
             extend_exclude: config
                 .extend_exclude
-                .map(|paths| {
-                    paths
-                        .iter()
-                        .map(|path| FilePattern::from_user(path, &project_root))
-                        .collect()
-                })
-                .unwrap_or_default(),
-            select: if let Some(select) = config.select {
-                BTreeSet::from_iter(select)
-            } else {
-                BTreeSet::from_iter(DEFAULT_CHECK_CODES)
-            },
+                .iter()
+                .map(|path| FilePattern::from_user(path, &project_root))
+                .collect(),
+            extend_ignore: config.extend_ignore,
+            extend_select: config.extend_select,
+            ignore: config.ignore,
+            line_length: config.line_length.unwrap_or(88),
             per_file_ignores: config
                 .per_file_ignores
-                .map(|ignore_strings| {
-                    ignore_strings
-                        .into_iter()
-                        .map(|pair| PerFileIgnore::new(pair, &project_root))
-                        .collect()
-                })
-                .unwrap_or_default(),
-            dummy_variable_rgx: match config.dummy_variable_rgx {
-                Some(pattern) => Regex::new(&pattern)
-                    .map_err(|e| anyhow!("Invalid dummy-variable-rgx value: {e}"))?,
-                None => DEFAULT_DUMMY_VARIABLE_RGX.clone(),
-            },
-            pyproject,
+                .into_iter()
+                .map(|pair| PerFileIgnore::new(pair, &project_root))
+                .collect(),
             project_root,
-        };
-        if let Some(ignore) = &config.ignore {
-            settings.ignore(ignore);
+            pyproject,
+            select: config
+                .select
+                .unwrap_or_else(|| DEFAULT_CHECK_CODES.to_vec()),
+        })
+    }
+}
+
+#[derive(Debug)]
+pub struct Settings {
+    pub dummy_variable_rgx: Regex,
+    pub enabled: BTreeSet<CheckCode>,
+    pub exclude: Vec<FilePattern>,
+    pub extend_exclude: Vec<FilePattern>,
+    pub line_length: usize,
+    pub per_file_ignores: Vec<PerFileIgnore>,
+}
+
+impl Settings {
+    pub fn from_raw(settings: RawSettings) -> Self {
+        // Materialize the set of enabled CheckCodes.
+        let mut enabled: BTreeSet<CheckCode> = BTreeSet::new();
+        enabled.extend(settings.select);
+        enabled.extend(settings.extend_select);
+        for code in &settings.ignore {
+            enabled.remove(code);
         }
-        Ok(settings)
-    }
-
-    pub fn clear(&mut self) {
-        self.select.clear();
-    }
-
-    pub fn select(&mut self, codes: Vec<CheckCode>) {
-        for code in codes {
-            self.select.insert(code);
+        for code in &settings.extend_ignore {
+            enabled.remove(code);
+        }
+        Self {
+            dummy_variable_rgx: settings.dummy_variable_rgx,
+            enabled,
+            exclude: settings.exclude,
+            extend_exclude: settings.extend_exclude,
+            line_length: settings.line_length,
+            per_file_ignores: settings.per_file_ignores,
         }
     }
 
-    pub fn ignore(&mut self, codes: &[CheckCode]) {
-        for code in codes {
-            self.select.remove(code);
+    pub fn for_rule(check_code: CheckCode) -> Self {
+        Self {
+            dummy_variable_rgx: DEFAULT_DUMMY_VARIABLE_RGX.clone(),
+            enabled: BTreeSet::from([check_code]),
+            exclude: vec![],
+            extend_exclude: vec![],
+            line_length: 88,
+            per_file_ignores: vec![],
+        }
+    }
+
+    pub fn for_rules(check_codes: Vec<CheckCode>) -> Self {
+        Self {
+            dummy_variable_rgx: DEFAULT_DUMMY_VARIABLE_RGX.clone(),
+            enabled: BTreeSet::from_iter(check_codes),
+            exclude: vec![],
+            extend_exclude: vec![],
+            line_length: 88,
+            per_file_ignores: vec![],
+        }
+    }
+}
+
+impl Hash for Settings {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.line_length.hash(state);
+        self.dummy_variable_rgx.as_str().hash(state);
+        for value in self.enabled.iter() {
+            value.hash(state);
+        }
+        for value in self.per_file_ignores.iter() {
+            value.hash(state);
         }
     }
 }
@@ -227,22 +230,23 @@ impl Exclusion {
 /// Struct to render user-facing Settings.
 #[derive(Debug)]
 pub struct CurrentSettings {
-    pub pyproject: Option<PathBuf>,
-    pub project_root: Option<PathBuf>,
-    pub line_length: usize,
+    pub dummy_variable_rgx: Regex,
     pub exclude: Vec<Exclusion>,
     pub extend_exclude: Vec<Exclusion>,
-    pub select: BTreeSet<CheckCode>,
+    pub extend_ignore: Vec<CheckCode>,
+    pub extend_select: Vec<CheckCode>,
+    pub ignore: Vec<CheckCode>,
+    pub line_length: usize,
     pub per_file_ignores: Vec<PerFileIgnore>,
-    pub dummy_variable_rgx: Regex,
+    pub project_root: Option<PathBuf>,
+    pub pyproject: Option<PathBuf>,
+    pub select: Vec<CheckCode>,
 }
 
 impl CurrentSettings {
-    pub fn from_settings(settings: Settings) -> Self {
+    pub fn from_settings(settings: RawSettings) -> Self {
         Self {
-            pyproject: settings.pyproject,
-            project_root: settings.project_root,
-            line_length: settings.line_length,
+            dummy_variable_rgx: settings.dummy_variable_rgx,
             exclude: settings
                 .exclude
                 .into_iter()
@@ -253,9 +257,14 @@ impl CurrentSettings {
                 .into_iter()
                 .map(Exclusion::from_file_pattern)
                 .collect(),
-            select: settings.select,
+            extend_ignore: settings.extend_ignore,
+            extend_select: settings.extend_select,
+            ignore: settings.ignore,
+            line_length: settings.line_length,
             per_file_ignores: settings.per_file_ignores,
-            dummy_variable_rgx: settings.dummy_variable_rgx,
+            project_root: settings.project_root,
+            pyproject: settings.pyproject,
+            select: settings.select,
         }
     }
 }

src/snapshots/ruff__linter__tests__a001.snap

@@ -0,0 +1,167 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind:
+    BuiltinVariableShadowing: sum
+  location:
+    row: 1
+    column: 1
+  end_location:
+    row: 1
+    column: 19
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: int
+  location:
+    row: 2
+    column: 1
+  end_location:
+    row: 2
+    column: 30
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: print
+  location:
+    row: 4
+    column: 1
+  end_location:
+    row: 4
+    column: 6
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: copyright
+  location:
+    row: 5
+    column: 1
+  end_location:
+    row: 5
+    column: 10
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: complex
+  location:
+    row: 6
+    column: 2
+  end_location:
+    row: 6
+    column: 14
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: float
+  location:
+    row: 7
+    column: 1
+  end_location:
+    row: 7
+    column: 6
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: object
+  location:
+    row: 7
+    column: 9
+  end_location:
+    row: 7
+    column: 15
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: min
+  location:
+    row: 8
+    column: 1
+  end_location:
+    row: 8
+    column: 4
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: max
+  location:
+    row: 8
+    column: 6
+  end_location:
+    row: 8
+    column: 9
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: bytes
+  location:
+    row: 10
+    column: 1
+  end_location:
+    row: 13
+    column: 1
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: slice
+  location:
+    row: 13
+    column: 1
+  end_location:
+    row: 16
+    column: 1
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: ValueError
+  location:
+    row: 18
+    column: 1
+  end_location:
+    row: 21
+    column: 1
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: memoryview
+  location:
+    row: 21
+    column: 5
+  end_location:
+    row: 21
+    column: 15
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: bytearray
+  location:
+    row: 21
+    column: 18
+  end_location:
+    row: 21
+    column: 27
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: str
+  location:
+    row: 24
+    column: 22
+  end_location:
+    row: 24
+    column: 25
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: all
+  location:
+    row: 24
+    column: 45
+  end_location:
+    row: 24
+    column: 48
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: any
+  location:
+    row: 24
+    column: 50
+  end_location:
+    row: 24
+    column: 53
+  fix: ~
+- kind:
+    BuiltinVariableShadowing: sum
+  location:
+    row: 27
+    column: 8
+  end_location:
+    row: 27
+    column: 11
+  fix: ~
+

src/snapshots/ruff__linter__tests__a002.snap

@@ -0,0 +1,68 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind:
+    BuiltinArgumentShadowing: str
+  location:
+    row: 1
+    column: 11
+  end_location:
+    row: 1
+    column: 14
+  fix: ~
+- kind:
+    BuiltinArgumentShadowing: type
+  location:
+    row: 1
+    column: 19
+  end_location:
+    row: 1
+    column: 23
+  fix: ~
+- kind:
+    BuiltinArgumentShadowing: complex
+  location:
+    row: 1
+    column: 26
+  end_location:
+    row: 1
+    column: 33
+  fix: ~
+- kind:
+    BuiltinArgumentShadowing: Exception
+  location:
+    row: 1
+    column: 35
+  end_location:
+    row: 1
+    column: 44
+  fix: ~
+- kind:
+    BuiltinArgumentShadowing: getattr
+  location:
+    row: 1
+    column: 48
+  end_location:
+    row: 1
+    column: 55
+  fix: ~
+- kind:
+    BuiltinArgumentShadowing: bytes
+  location:
+    row: 5
+    column: 17
+  end_location:
+    row: 5
+    column: 22
+  fix: ~
+- kind:
+    BuiltinArgumentShadowing: float
+  location:
+    row: 9
+    column: 16
+  end_location:
+    row: 9
+    column: 21
+  fix: ~
+

src/snapshots/ruff__linter__tests__a003.snap

@@ -0,0 +1,23 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind:
+    BuiltinAttributeShadowing: ImportError
+  location:
+    row: 2
+    column: 5
+  end_location:
+    row: 2
+    column: 16
+  fix: ~
+- kind:
+    BuiltinAttributeShadowing: str
+  location:
+    row: 7
+    column: 5
+  end_location:
+    row: 9
+    column: 1
+  fix: ~
+

src/snapshots/ruff__linter__tests__e402.snap

@@ -4,7 +4,10 @@ expression: checks
 ---
 - kind: ModuleImportNotAtTopOfFile
   location:
-    row: 20
+    row: 24
     column: 1
+  end_location:
+    row: 24
+    column: 9
   fix: ~
 

src/snapshots/ruff__linter__tests__e501.snap

@@ -8,6 +8,9 @@ expression: checks
       - 88
   location:
     row: 5
-    column: 89
+    column: 1
+  end_location:
+    row: 5
+    column: 124
   fix: ~
 

src/snapshots/ruff__linter__tests__e711.snap

@@ -7,47 +7,71 @@ expression: checks
   location:
     row: 2
     column: 11
+  end_location:
+    row: 2
+    column: 15
   fix: ~
 - kind:
     NoneComparison: NotEq
   location:
     row: 5
     column: 11
+  end_location:
+    row: 5
+    column: 15
   fix: ~
 - kind:
     NoneComparison: Eq
   location:
     row: 8
     column: 4
+  end_location:
+    row: 8
+    column: 8
   fix: ~
 - kind:
     NoneComparison: NotEq
   location:
     row: 11
     column: 4
+  end_location:
+    row: 11
+    column: 8
   fix: ~
 - kind:
     NoneComparison: Eq
   location:
     row: 14
     column: 14
+  end_location:
+    row: 14
+    column: 18
   fix: ~
 - kind:
     NoneComparison: NotEq
   location:
     row: 17
     column: 14
+  end_location:
+    row: 17
+    column: 18
   fix: ~
 - kind:
     NoneComparison: NotEq
   location:
     row: 20
     column: 4
+  end_location:
+    row: 20
+    column: 8
   fix: ~
 - kind:
     NoneComparison: Eq
   location:
     row: 23
     column: 4
+  end_location:
+    row: 23
+    column: 8
   fix: ~
 

src/snapshots/ruff__linter__tests__e712.snap

@@ -9,6 +9,9 @@ expression: checks
   location:
     row: 2
     column: 11
+  end_location:
+    row: 2
+    column: 15
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -17,6 +20,9 @@ expression: checks
   location:
     row: 5
     column: 11
+  end_location:
+    row: 5
+    column: 16
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -25,6 +31,9 @@ expression: checks
   location:
     row: 8
     column: 4
+  end_location:
+    row: 8
+    column: 8
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -33,6 +42,9 @@ expression: checks
   location:
     row: 11
     column: 4
+  end_location:
+    row: 11
+    column: 9
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -41,6 +53,9 @@ expression: checks
   location:
     row: 14
     column: 14
+  end_location:
+    row: 14
+    column: 18
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -49,6 +64,9 @@ expression: checks
   location:
     row: 17
     column: 14
+  end_location:
+    row: 17
+    column: 19
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -57,6 +75,9 @@ expression: checks
   location:
     row: 20
     column: 20
+  end_location:
+    row: 20
+    column: 24
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -65,6 +86,9 @@ expression: checks
   location:
     row: 20
     column: 44
+  end_location:
+    row: 20
+    column: 49
   fix: ~
 - kind:
     TrueFalseComparison:
@@ -73,5 +97,8 @@ expression: checks
   location:
     row: 22
     column: 5
+  end_location:
+    row: 22
+    column: 9
   fix: ~
 

src/snapshots/ruff__linter__tests__e713.snap

@@ -6,25 +6,40 @@ expression: checks
   location:
     row: 2
     column: 10
+  end_location:
+    row: 2
+    column: 14
   fix: ~
 - kind: NotInTest
   location:
     row: 5
     column: 12
+  end_location:
+    row: 5
+    column: 16
   fix: ~
 - kind: NotInTest
   location:
     row: 8
     column: 10
+  end_location:
+    row: 8
+    column: 14
   fix: ~
 - kind: NotInTest
   location:
     row: 11
     column: 25
+  end_location:
+    row: 11
+    column: 29
   fix: ~
 - kind: NotInTest
   location:
     row: 14
     column: 11
+  end_location:
+    row: 14
+    column: 15
   fix: ~
 

src/snapshots/ruff__linter__tests__e714.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 2
     column: 10
+  end_location:
+    row: 2
+    column: 14
   fix: ~
 - kind: NotIsTest
   location:
     row: 5
     column: 12
+  end_location:
+    row: 5
+    column: 16
   fix: ~
 - kind: NotIsTest
   location:
     row: 8
     column: 10
+  end_location:
+    row: 8
+    column: 23
   fix: ~
 

src/snapshots/ruff__linter__tests__e721.snap

@@ -6,80 +6,128 @@ expression: checks
   location:
     row: 2
     column: 14
+  end_location:
+    row: 2
+    column: 25
   fix: ~
 - kind: TypeComparison
   location:
     row: 5
     column: 14
+  end_location:
+    row: 5
+    column: 25
   fix: ~
 - kind: TypeComparison
   location:
     row: 10
     column: 8
+  end_location:
+    row: 10
+    column: 24
   fix: ~
 - kind: TypeComparison
   location:
     row: 15
     column: 14
+  end_location:
+    row: 15
+    column: 35
   fix: ~
 - kind: TypeComparison
   location:
     row: 18
     column: 18
+  end_location:
+    row: 18
+    column: 32
   fix: ~
 - kind: TypeComparison
   location:
     row: 18
     column: 46
+  end_location:
+    row: 18
+    column: 59
   fix: ~
 - kind: TypeComparison
   location:
     row: 20
     column: 18
+  end_location:
+    row: 20
+    column: 29
   fix: ~
 - kind: TypeComparison
   location:
     row: 22
     column: 18
+  end_location:
+    row: 22
+    column: 29
   fix: ~
 - kind: TypeComparison
   location:
     row: 24
     column: 18
+  end_location:
+    row: 24
+    column: 31
   fix: ~
 - kind: TypeComparison
   location:
     row: 26
     column: 18
+  end_location:
+    row: 26
+    column: 30
   fix: ~
 - kind: TypeComparison
   location:
     row: 28
     column: 18
+  end_location:
+    row: 28
+    column: 31
   fix: ~
 - kind: TypeComparison
   location:
     row: 30
     column: 18
+  end_location:
+    row: 30
+    column: 31
   fix: ~
 - kind: TypeComparison
   location:
     row: 32
     column: 18
+  end_location:
+    row: 32
+    column: 35
   fix: ~
 - kind: TypeComparison
   location:
     row: 34
     column: 18
+  end_location:
+    row: 38
+    column: 2
   fix: ~
 - kind: TypeComparison
   location:
     row: 40
     column: 18
+  end_location:
+    row: 40
+    column: 29
   fix: ~
 - kind: TypeComparison
   location:
     row: 42
     column: 18
+  end_location:
+    row: 42
+    column: 31
   fix: ~
 

src/snapshots/ruff__linter__tests__e722.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 4
     column: 1
+  end_location:
+    row: 7
+    column: 1
   fix: ~
 - kind: DoNotUseBareExcept
   location:
     row: 11
     column: 1
+  end_location:
+    row: 14
+    column: 1
   fix: ~
 - kind: DoNotUseBareExcept
   location:
     row: 16
     column: 1
+  end_location:
+    row: 19
+    column: 1
   fix: ~
 

src/snapshots/ruff__linter__tests__e731.snap

@@ -6,25 +6,40 @@ expression: checks
   location:
     row: 2
     column: 1
+  end_location:
+    row: 2
+    column: 20
   fix: ~
 - kind: DoNotAssignLambda
   location:
     row: 4
     column: 1
+  end_location:
+    row: 4
+    column: 20
   fix: ~
 - kind: DoNotAssignLambda
   location:
     row: 7
     column: 5
+  end_location:
+    row: 7
+    column: 30
   fix: ~
 - kind: DoNotAssignLambda
   location:
     row: 12
     column: 1
+  end_location:
+    row: 12
+    column: 28
   fix: ~
 - kind: DoNotAssignLambda
   location:
     row: 16
     column: 1
+  end_location:
+    row: 16
+    column: 26
   fix: ~
 

src/snapshots/ruff__linter__tests__e741.snap

@@ -7,149 +7,224 @@ expression: checks
   location:
     row: 3
     column: 1
+  end_location:
+    row: 3
+    column: 2
   fix: ~
 - kind:
     AmbiguousVariableName: I
   location:
     row: 4
     column: 1
+  end_location:
+    row: 4
+    column: 2
   fix: ~
 - kind:
     AmbiguousVariableName: O
   location:
     row: 5
     column: 1
+  end_location:
+    row: 5
+    column: 2
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 6
     column: 1
+  end_location:
+    row: 6
+    column: 2
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 8
     column: 4
+  end_location:
+    row: 8
+    column: 5
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 9
     column: 5
+  end_location:
+    row: 9
+    column: 6
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 10
     column: 5
+  end_location:
+    row: 10
+    column: 6
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 11
     column: 5
+  end_location:
+    row: 11
+    column: 6
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 16
     column: 5
+  end_location:
+    row: 16
+    column: 6
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 20
     column: 8
+  end_location:
+    row: 20
+    column: 9
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 25
     column: 5
+  end_location:
+    row: 25
+    column: 13
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 26
     column: 5
+  end_location:
+    row: 26
+    column: 6
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 30
     column: 5
+  end_location:
+    row: 30
+    column: 6
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 33
     column: 9
+  end_location:
+    row: 33
+    column: 19
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 34
     column: 9
+  end_location:
+    row: 34
+    column: 10
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 40
     column: 8
+  end_location:
+    row: 40
+    column: 9
   fix: ~
 - kind:
     AmbiguousVariableName: I
   location:
     row: 40
     column: 14
+  end_location:
+    row: 40
+    column: 15
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 44
     column: 8
+  end_location:
+    row: 44
+    column: 9
   fix: ~
 - kind:
     AmbiguousVariableName: I
   location:
     row: 44
     column: 16
+  end_location:
+    row: 44
+    column: 17
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 48
     column: 9
+  end_location:
+    row: 48
+    column: 10
   fix: ~
 - kind:
     AmbiguousVariableName: I
   location:
     row: 48
     column: 14
+  end_location:
+    row: 48
+    column: 15
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 57
     column: 16
+  end_location:
+    row: 57
+    column: 17
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 66
     column: 20
+  end_location:
+    row: 66
+    column: 21
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 71
     column: 1
+  end_location:
+    row: 74
+    column: 1
   fix: ~
 - kind:
     AmbiguousVariableName: l
   location:
     row: 74
     column: 5
+  end_location:
+    row: 74
+    column: 11
   fix: ~
 

src/snapshots/ruff__linter__tests__e742.snap

@@ -7,17 +7,26 @@ expression: checks
   location:
     row: 1
     column: 1
+  end_location:
+    row: 5
+    column: 1
   fix: ~
 - kind:
     AmbiguousClassName: I
   location:
     row: 5
     column: 1
+  end_location:
+    row: 9
+    column: 1
   fix: ~
 - kind:
     AmbiguousClassName: O
   location:
     row: 9
     column: 1
+  end_location:
+    row: 13
+    column: 1
   fix: ~
 

src/snapshots/ruff__linter__tests__e743.snap

@@ -7,17 +7,26 @@ expression: checks
   location:
     row: 1
     column: 1
+  end_location:
+    row: 5
+    column: 1
   fix: ~
 - kind:
     AmbiguousFunctionName: I
   location:
     row: 5
     column: 1
+  end_location:
+    row: 9
+    column: 1
   fix: ~
 - kind:
     AmbiguousFunctionName: O
   location:
     row: 10
     column: 5
+  end_location:
+    row: 14
+    column: 1
   fix: ~
 

src/snapshots/ruff__linter__tests__e999.snap

@@ -7,5 +7,8 @@ expression: checks
   location:
     row: 2
     column: 1
+  end_location:
+    row: 2
+    column: 1
   fix: ~
 

src/snapshots/ruff__linter__tests__f401.snap

@@ -5,19 +5,120 @@ expression: checks
 - kind:
     UnusedImport: functools
   location:
-    row: 3
+    row: 2
     column: 1
-  fix: ~
+  end_location:
+    row: 2
+    column: 21
+  fix:
+    content: import os
+    location:
+      row: 2
+      column: 1
+    end_location:
+      row: 2
+      column: 21
+    applied: false
 - kind:
     UnusedImport: collections.OrderedDict
   location:
-    row: 5
+    row: 4
     column: 1
-  fix: ~
+  end_location:
+    row: 8
+    column: 2
+  fix:
+    content: "from collections import (\n    Counter,\n    namedtuple,\n)"
+    location:
+      row: 4
+      column: 1
+    end_location:
+      row: 8
+      column: 2
+    applied: false
 - kind:
     UnusedImport: logging.handlers
   location:
-    row: 13
+    row: 12
     column: 1
-  fix: ~
+  end_location:
+    row: 12
+    column: 24
+  fix:
+    content: import logging.handlers
+    location:
+      row: 12
+      column: 1
+    end_location:
+      row: 12
+      column: 24
+    applied: false
+- kind:
+    UnusedImport: shelve
+  location:
+    row: 33
+    column: 5
+  end_location:
+    row: 33
+    column: 18
+  fix:
+    content: ""
+    location:
+      row: 33
+      column: 1
+    end_location:
+      row: 34
+      column: 1
+    applied: false
+- kind:
+    UnusedImport: importlib
+  location:
+    row: 34
+    column: 5
+  end_location:
+    row: 34
+    column: 21
+  fix:
+    content: pass
+    location:
+      row: 34
+      column: 5
+    end_location:
+      row: 34
+      column: 21
+    applied: false
+- kind:
+    UnusedImport: pathlib
+  location:
+    row: 38
+    column: 5
+  end_location:
+    row: 38
+    column: 19
+  fix:
+    content: ""
+    location:
+      row: 38
+      column: 1
+    end_location:
+      row: 39
+      column: 1
+    applied: false
+- kind:
+    UnusedImport: pickle
+  location:
+    row: 53
+    column: 9
+  end_location:
+    row: 53
+    column: 22
+  fix:
+    content: pass
+    location:
+      row: 53
+      column: 9
+    end_location:
+      row: 53
+      column: 22
+    applied: false
 

src/snapshots/ruff__linter__tests__f402.snap

@@ -9,6 +9,9 @@ expression: checks
   location:
     row: 5
     column: 5
+  end_location:
+    row: 5
+    column: 7
   fix: ~
 - kind:
     ImportShadowedByLoopVar:
@@ -17,5 +20,8 @@ expression: checks
   location:
     row: 8
     column: 5
+  end_location:
+    row: 8
+    column: 9
   fix: ~
 

src/snapshots/ruff__linter__tests__f403.snap

@@ -7,11 +7,17 @@ expression: checks
   location:
     row: 1
     column: 1
+  end_location:
+    row: 1
+    column: 19
   fix: ~
 - kind:
     ImportStarUsed: F634
   location:
     row: 2
     column: 1
+  end_location:
+    row: 2
+    column: 19
   fix: ~
 

src/snapshots/ruff__linter__tests__f404.snap

@@ -6,5 +6,8 @@ expression: checks
   location:
     row: 7
     column: 1
+  end_location:
+    row: 7
+    column: 38
   fix: ~
 

src/snapshots/ruff__linter__tests__f405.snap

@@ -5,17 +5,23 @@ expression: checks
 - kind:
     ImportStarUsage:
       - name
-      - mymodule
+      - - mymodule
   location:
     row: 5
     column: 11
+  end_location:
+    row: 5
+    column: 15
   fix: ~
 - kind:
     ImportStarUsage:
       - a
-      - mymodule
+      - - mymodule
   location:
     row: 11
     column: 1
+  end_location:
+    row: 11
+    column: 8
   fix: ~
 

src/snapshots/ruff__linter__tests__f406.snap

@@ -7,11 +7,17 @@ expression: checks
   location:
     row: 5
     column: 5
+  end_location:
+    row: 5
+    column: 23
   fix: ~
 - kind:
     ImportStarNotPermitted: F634
   location:
     row: 9
     column: 5
+  end_location:
+    row: 9
+    column: 23
   fix: ~
 

src/snapshots/ruff__linter__tests__f407.snap

@@ -7,5 +7,8 @@ expression: checks
   location:
     row: 2
     column: 1
+  end_location:
+    row: 2
+    column: 44
   fix: ~
 

src/snapshots/ruff__linter__tests__f541.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 4
     column: 7
+  end_location:
+    row: 4
+    column: 11
   fix: ~
 - kind: FStringMissingPlaceholders
   location:
     row: 5
     column: 7
+  end_location:
+    row: 5
+    column: 11
   fix: ~
 - kind: FStringMissingPlaceholders
   location:
     row: 7
     column: 7
+  end_location:
+    row: 7
+    column: 11
   fix: ~
 

src/snapshots/ruff__linter__tests__f601.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 3
     column: 6
+  end_location:
+    row: 3
+    column: 8
   fix: ~
 - kind: MultiValueRepeatedKeyLiteral
   location:
     row: 9
     column: 5
+  end_location:
+    row: 9
+    column: 6
   fix: ~
 - kind: MultiValueRepeatedKeyLiteral
   location:
     row: 11
     column: 7
+  end_location:
+    row: 11
+    column: 11
   fix: ~
 

src/snapshots/ruff__linter__tests__f602.snap

@@ -7,5 +7,8 @@ expression: checks
   location:
     row: 5
     column: 5
+  end_location:
+    row: 5
+    column: 6
   fix: ~
 

src/snapshots/ruff__linter__tests__f622.snap

@@ -6,5 +6,8 @@ expression: checks
   location:
     row: 1
     column: 1
+  end_location:
+    row: 1
+    column: 10
   fix: ~
 

src/snapshots/ruff__linter__tests__f631.snap

@@ -6,10 +6,16 @@ expression: checks
   location:
     row: 1
     column: 1
+  end_location:
+    row: 1
+    column: 20
   fix: ~
 - kind: AssertTuple
   location:
     row: 2
     column: 1
+  end_location:
+    row: 2
+    column: 16
   fix: ~
 

src/snapshots/ruff__linter__tests__f632.snap

@@ -6,10 +6,16 @@ expression: checks
   location:
     row: 1
     column: 6
+  end_location:
+    row: 1
+    column: 14
   fix: ~
 - kind: IsLiteral
   location:
     row: 4
     column: 8
+  end_location:
+    row: 4
+    column: 16
   fix: ~
 

src/snapshots/ruff__linter__tests__f633.snap

@@ -6,5 +6,8 @@ expression: checks
   location:
     row: 4
     column: 1
+  end_location:
+    row: 4
+    column: 6
   fix: ~
 

src/snapshots/ruff__linter__tests__f634.snap

@@ -6,10 +6,16 @@ expression: checks
   location:
     row: 1
     column: 1
+  end_location:
+    row: 4
+    column: 1
   fix: ~
 - kind: IfTuple
   location:
     row: 7
     column: 5
+  end_location:
+    row: 9
+    column: 5
   fix: ~
 

src/snapshots/ruff__linter__tests__f701.snap

@@ -6,20 +6,32 @@ expression: checks
   location:
     row: 4
     column: 5
+  end_location:
+    row: 4
+    column: 10
   fix: ~
 - kind: BreakOutsideLoop
   location:
     row: 16
     column: 5
+  end_location:
+    row: 16
+    column: 10
   fix: ~
 - kind: BreakOutsideLoop
   location:
     row: 20
     column: 5
+  end_location:
+    row: 20
+    column: 10
   fix: ~
 - kind: BreakOutsideLoop
   location:
     row: 23
     column: 1
+  end_location:
+    row: 23
+    column: 6
   fix: ~
 

src/snapshots/ruff__linter__tests__f702.snap

@@ -6,20 +6,32 @@ expression: checks
   location:
     row: 4
     column: 5
+  end_location:
+    row: 4
+    column: 13
   fix: ~
 - kind: ContinueOutsideLoop
   location:
     row: 16
     column: 5
+  end_location:
+    row: 16
+    column: 13
   fix: ~
 - kind: ContinueOutsideLoop
   location:
     row: 20
     column: 5
+  end_location:
+    row: 20
+    column: 13
   fix: ~
 - kind: ContinueOutsideLoop
   location:
     row: 23
     column: 1
+  end_location:
+    row: 23
+    column: 9
   fix: ~
 

src/snapshots/ruff__linter__tests__f704.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 6
     column: 5
+  end_location:
+    row: 6
+    column: 12
   fix: ~
 - kind: YieldOutsideFunction
   location:
     row: 9
     column: 1
+  end_location:
+    row: 9
+    column: 8
   fix: ~
 - kind: YieldOutsideFunction
   location:
     row: 10
     column: 1
+  end_location:
+    row: 10
+    column: 13
   fix: ~
 

src/snapshots/ruff__linter__tests__f706.snap

@@ -6,10 +6,16 @@ expression: checks
   location:
     row: 6
     column: 5
+  end_location:
+    row: 6
+    column: 13
   fix: ~
 - kind: ReturnOutsideFunction
   location:
     row: 9
     column: 1
+  end_location:
+    row: 9
+    column: 9
   fix: ~
 

src/snapshots/ruff__linter__tests__f707.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 3
     column: 1
+  end_location:
+    row: 5
+    column: 1
   fix: ~
 - kind: DefaultExceptNotLast
   location:
     row: 10
     column: 1
+  end_location:
+    row: 12
+    column: 1
   fix: ~
 - kind: DefaultExceptNotLast
   location:
     row: 19
     column: 1
+  end_location:
+    row: 21
+    column: 1
   fix: ~
 

src/snapshots/ruff__linter__tests__f722.snap

@@ -7,5 +7,8 @@ expression: checks
   location:
     row: 9
     column: 13
+  end_location:
+    row: 9
+    column: 17
   fix: ~
 

src/snapshots/ruff__linter__tests__f821.snap

@@ -7,47 +7,71 @@ expression: checks
   location:
     row: 2
     column: 12
+  end_location:
+    row: 2
+    column: 16
   fix: ~
 - kind:
     UndefinedName: self
   location:
     row: 6
     column: 13
+  end_location:
+    row: 6
+    column: 17
   fix: ~
 - kind:
     UndefinedName: self
   location:
     row: 10
     column: 9
+  end_location:
+    row: 10
+    column: 13
   fix: ~
 - kind:
     UndefinedName: numeric_string
   location:
     row: 21
     column: 12
+  end_location:
+    row: 21
+    column: 26
   fix: ~
 - kind:
     UndefinedName: Bar
   location:
     row: 58
     column: 5
+  end_location:
+    row: 58
+    column: 9
   fix: ~
 - kind:
     UndefinedName: TOMATO
   location:
     row: 83
     column: 11
+  end_location:
+    row: 83
+    column: 17
   fix: ~
 - kind:
     UndefinedName: B
   location:
     row: 87
     column: 7
+  end_location:
+    row: 87
+    column: 11
   fix: ~
 - kind:
     UndefinedName: B
   location:
     row: 89
     column: 7
+  end_location:
+    row: 89
+    column: 9
   fix: ~
 

src/snapshots/ruff__linter__tests__f822.snap

@@ -7,5 +7,8 @@ expression: checks
   location:
     row: 3
     column: 1
+  end_location:
+    row: 3
+    column: 8
   fix: ~
 

src/snapshots/ruff__linter__tests__f823.snap

@@ -7,5 +7,8 @@ expression: checks
   location:
     row: 6
     column: 5
+  end_location:
+    row: 6
+    column: 11
   fix: ~
 

src/snapshots/ruff__linter__tests__f831.snap

@@ -6,15 +6,24 @@ expression: checks
   location:
     row: 1
     column: 25
+  end_location:
+    row: 1
+    column: 31
   fix: ~
 - kind: DuplicateArgumentName
   location:
     row: 5
     column: 28
+  end_location:
+    row: 5
+    column: 34
   fix: ~
 - kind: DuplicateArgumentName
   location:
     row: 9
     column: 27
+  end_location:
+    row: 9
+    column: 33
   fix: ~
 

src/snapshots/ruff__linter__tests__f841.snap

@@ -7,29 +7,44 @@ expression: checks
   location:
     row: 3
     column: 1
+  end_location:
+    row: 7
+    column: 1
   fix: ~
 - kind:
     UnusedVariable: z
   location:
     row: 16
     column: 5
+  end_location:
+    row: 16
+    column: 6
   fix: ~
 - kind:
     UnusedVariable: foo
   location:
     row: 20
     column: 5
+  end_location:
+    row: 20
+    column: 8
   fix: ~
 - kind:
     UnusedVariable: a
   location:
     row: 21
     column: 6
+  end_location:
+    row: 21
+    column: 7
   fix: ~
 - kind:
     UnusedVariable: b
   location:
     row: 21
     column: 9
+  end_location:
+    row: 21
+    column: 10
   fix: ~
 

src/snapshots/ruff__linter__tests__f841_dummy_variable_rgx.snap

@@ -7,41 +7,62 @@ expression: checks
   location:
     row: 3
     column: 1
+  end_location:
+    row: 7
+    column: 1
   fix: ~
 - kind:
     UnusedVariable: foo
   location:
     row: 20
     column: 5
+  end_location:
+    row: 20
+    column: 8
   fix: ~
 - kind:
     UnusedVariable: a
   location:
     row: 21
     column: 6
+  end_location:
+    row: 21
+    column: 7
   fix: ~
 - kind:
     UnusedVariable: b
   location:
     row: 21
     column: 9
+  end_location:
+    row: 21
+    column: 10
   fix: ~
 - kind:
     UnusedVariable: _
   location:
     row: 35
     column: 5
+  end_location:
+    row: 35
+    column: 6
   fix: ~
 - kind:
     UnusedVariable: __
   location:
     row: 36
     column: 5
+  end_location:
+    row: 36
+    column: 7
   fix: ~
 - kind:
     UnusedVariable: _discarded
   location:
     row: 37
     column: 5
+  end_location:
+    row: 37
+    column: 15
   fix: ~
 

src/snapshots/ruff__linter__tests__f901.snap

@@ -5,11 +5,17 @@ expression: checks
 - kind: RaiseNotImplemented
   location:
     row: 2
-    column: 25
+    column: 11
+  end_location:
+    row: 2
+    column: 27
   fix: ~
 - kind: RaiseNotImplemented
   location:
     row: 6
     column: 11
+  end_location:
+    row: 6
+    column: 25
   fix: ~
 

src/snapshots/ruff__linter__tests__future_annotations.snap

@@ -7,11 +7,25 @@ expression: checks
   location:
     row: 5
     column: 1
-  fix: ~
+  end_location:
+    row: 8
+    column: 2
+  fix:
+    content: "from models import (\n    Fruit,\n)"
+    location:
+      row: 5
+      column: 1
+    end_location:
+      row: 8
+      column: 2
+    applied: false
 - kind:
     UndefinedName: Bar
   location:
-    row: 22
+    row: 25
     column: 19
+  end_location:
+    row: 25
+    column: 22
   fix: ~
 

src/snapshots/ruff__linter__tests__m001.snap

@@ -7,12 +7,15 @@ expression: checks
   location:
     row: 9
     column: 10
+  end_location:
+    row: 9
+    column: 18
   fix:
     content: ""
-    start:
+    location:
       row: 9
       column: 10
-    end:
+    end_location:
       row: 9
       column: 18
     applied: false
@@ -21,12 +24,15 @@ expression: checks
   location:
     row: 13
     column: 10
+  end_location:
+    row: 13
+    column: 24
   fix:
     content: ""
-    start:
+    location:
       row: 13
       column: 10
-    end:
+    end_location:
       row: 13
       column: 24
     applied: false
@@ -35,12 +41,15 @@ expression: checks
   location:
     row: 16
     column: 10
+  end_location:
+    row: 16
+    column: 30
   fix:
     content: "  # noqa: F841"
-    start:
+    location:
       row: 16
       column: 10
-    end:
+    end_location:
       row: 16
       column: 30
     applied: false
@@ -49,12 +58,15 @@ expression: checks
   location:
     row: 41
     column: 4
+  end_location:
+    row: 41
+    column: 24
   fix:
     content: "  # noqa: E501"
-    start:
+    location:
       row: 41
       column: 4
-    end:
+    end_location:
       row: 41
       column: 24
     applied: false
@@ -63,12 +75,15 @@ expression: checks
   location:
     row: 49
     column: 4
+  end_location:
+    row: 49
+    column: 18
   fix:
     content: ""
-    start:
+    location:
       row: 49
       column: 4
-    end:
+    end_location:
       row: 49
       column: 18
     applied: false
@@ -77,12 +92,15 @@ expression: checks
   location:
     row: 57
     column: 4
+  end_location:
+    row: 57
+    column: 12
   fix:
     content: ""
-    start:
+    location:
       row: 57
       column: 4
-    end:
+    end_location:
       row: 57
       column: 12
     applied: false

src/snapshots/ruff__linter__tests__r001.snap

@@ -7,12 +7,15 @@ expression: checks
   location:
     row: 5
     column: 9
+  end_location:
+    row: 5
+    column: 15
   fix:
     content: ""
-    start:
+    location:
       row: 5
       column: 8
-    end:
+    end_location:
       row: 5
       column: 16
     applied: false
@@ -21,12 +24,15 @@ expression: checks
   location:
     row: 10
     column: 5
+  end_location:
+    row: 10
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 9
       column: 8
-    end:
+    end_location:
       row: 11
       column: 2
     applied: false
@@ -35,12 +41,15 @@ expression: checks
   location:
     row: 16
     column: 5
+  end_location:
+    row: 16
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 15
       column: 8
-    end:
+    end_location:
       row: 18
       column: 2
     applied: false
@@ -49,12 +58,15 @@ expression: checks
   location:
     row: 24
     column: 5
+  end_location:
+    row: 24
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 22
       column: 8
-    end:
+    end_location:
       row: 25
       column: 2
     applied: false
@@ -63,12 +75,15 @@ expression: checks
   location:
     row: 31
     column: 5
+  end_location:
+    row: 31
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 29
       column: 8
-    end:
+    end_location:
       row: 32
       column: 2
     applied: false
@@ -77,12 +92,15 @@ expression: checks
   location:
     row: 37
     column: 5
+  end_location:
+    row: 37
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 36
       column: 8
-    end:
+    end_location:
       row: 39
       column: 2
     applied: false
@@ -91,12 +109,15 @@ expression: checks
   location:
     row: 45
     column: 5
+  end_location:
+    row: 45
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 43
       column: 8
-    end:
+    end_location:
       row: 47
       column: 2
     applied: false
@@ -105,12 +126,15 @@ expression: checks
   location:
     row: 53
     column: 5
+  end_location:
+    row: 53
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 51
       column: 8
-    end:
+    end_location:
       row: 55
       column: 2
     applied: false
@@ -119,12 +143,15 @@ expression: checks
   location:
     row: 61
     column: 5
+  end_location:
+    row: 61
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 59
       column: 8
-    end:
+    end_location:
       row: 63
       column: 2
     applied: false
@@ -133,12 +160,15 @@ expression: checks
   location:
     row: 69
     column: 5
+  end_location:
+    row: 69
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 67
       column: 8
-    end:
+    end_location:
       row: 71
       column: 2
     applied: false
@@ -147,12 +177,15 @@ expression: checks
   location:
     row: 75
     column: 12
+  end_location:
+    row: 75
+    column: 18
   fix:
     content: ""
-    start:
+    location:
       row: 75
       column: 10
-    end:
+    end_location:
       row: 75
       column: 18
     applied: false
@@ -161,12 +194,15 @@ expression: checks
   location:
     row: 79
     column: 9
+  end_location:
+    row: 79
+    column: 15
   fix:
     content: ""
-    start:
+    location:
       row: 79
       column: 9
-    end:
+    end_location:
       row: 79
       column: 17
     applied: false
@@ -175,12 +211,15 @@ expression: checks
   location:
     row: 84
     column: 5
+  end_location:
+    row: 84
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 84
       column: 5
-    end:
+    end_location:
       row: 85
       column: 5
     applied: false
@@ -189,12 +228,15 @@ expression: checks
   location:
     row: 92
     column: 5
+  end_location:
+    row: 92
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 91
       column: 6
-    end:
+    end_location:
       row: 92
       column: 11
     applied: false
@@ -203,12 +245,15 @@ expression: checks
   location:
     row: 98
     column: 5
+  end_location:
+    row: 98
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 98
       column: 5
-    end:
+    end_location:
       row: 100
       column: 5
     applied: false
@@ -217,12 +262,15 @@ expression: checks
   location:
     row: 108
     column: 5
+  end_location:
+    row: 108
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 107
       column: 6
-    end:
+    end_location:
       row: 108
       column: 11
     applied: false
@@ -231,12 +279,15 @@ expression: checks
   location:
     row: 114
     column: 13
+  end_location:
+    row: 114
+    column: 19
   fix:
     content: ""
-    start:
+    location:
       row: 114
       column: 12
-    end:
+    end_location:
       row: 114
       column: 20
     applied: false
@@ -245,12 +296,15 @@ expression: checks
   location:
     row: 119
     column: 5
+  end_location:
+    row: 119
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 118
       column: 8
-    end:
+    end_location:
       row: 120
       column: 2
     applied: false
@@ -259,12 +313,15 @@ expression: checks
   location:
     row: 125
     column: 5
+  end_location:
+    row: 125
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 124
       column: 8
-    end:
+    end_location:
       row: 126
       column: 2
     applied: false
@@ -273,12 +330,15 @@ expression: checks
   location:
     row: 131
     column: 5
+  end_location:
+    row: 131
+    column: 11
   fix:
     content: ""
-    start:
+    location:
       row: 130
       column: 8
-    end:
+    end_location:
       row: 133
       column: 2
     applied: false

src/snapshots/ruff__linter__tests__r002.snap

@@ -5,27 +5,33 @@ expression: checks
 - kind: NoAssertEquals
   location:
     row: 1
-    column: 5
+    column: 1
+  end_location:
+    row: 1
+    column: 18
   fix:
     content: assertEqual
-    start:
+    location:
       row: 1
-      column: 6
-    end:
+      column: 2
+    end_location:
       row: 1
-      column: 18
+      column: 14
     applied: false
 - kind: NoAssertEquals
   location:
     row: 2
-    column: 5
+    column: 1
+  end_location:
+    row: 2
+    column: 18
   fix:
     content: assertEqual
-    start:
+    location:
       row: 2
-      column: 6
-    end:
+      column: 2
+    end_location:
       row: 2
-      column: 18
+      column: 14
     applied: false
 

src/snapshots/ruff__linter__tests__spr001.snap

@@ -0,0 +1,85 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind: SuperCallWithParameters
+  location:
+    row: 17
+    column: 18
+  end_location:
+    row: 17
+    column: 36
+  fix:
+    content: super()
+    location:
+      row: 17
+      column: 18
+    end_location:
+      row: 17
+      column: 36
+    applied: false
+- kind: SuperCallWithParameters
+  location:
+    row: 18
+    column: 9
+  end_location:
+    row: 18
+    column: 27
+  fix:
+    content: super()
+    location:
+      row: 18
+      column: 9
+    end_location:
+      row: 18
+      column: 27
+    applied: false
+- kind: SuperCallWithParameters
+  location:
+    row: 19
+    column: 9
+  end_location:
+    row: 22
+    column: 10
+  fix:
+    content: super()
+    location:
+      row: 19
+      column: 9
+    end_location:
+      row: 22
+      column: 10
+    applied: false
+- kind: SuperCallWithParameters
+  location:
+    row: 36
+    column: 9
+  end_location:
+    row: 36
+    column: 29
+  fix:
+    content: super()
+    location:
+      row: 36
+      column: 9
+    end_location:
+      row: 36
+      column: 29
+    applied: false
+- kind: SuperCallWithParameters
+  location:
+    row: 50
+    column: 13
+  end_location:
+    row: 50
+    column: 33
+  fix:
+    content: super()
+    location:
+      row: 50
+      column: 13
+    end_location:
+      row: 50
+      column: 33
+    applied: false
+

src/snapshots/ruff__linter__tests__t201.snap

@@ -0,0 +1,21 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind: PrintFound
+  location:
+    row: 1
+    column: 1
+  end_location:
+    row: 1
+    column: 23
+  fix:
+    content: ""
+    location:
+      row: 1
+      column: 1
+    end_location:
+      row: 2
+      column: 1
+    applied: false
+

src/snapshots/ruff__linter__tests__t203.snap

@@ -0,0 +1,37 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind: PPrintFound
+  location:
+    row: 3
+    column: 1
+  end_location:
+    row: 3
+    column: 24
+  fix:
+    content: ""
+    location:
+      row: 3
+      column: 1
+    end_location:
+      row: 4
+      column: 1
+    applied: false
+- kind: PPrintFound
+  location:
+    row: 8
+    column: 1
+  end_location:
+    row: 8
+    column: 31
+  fix:
+    content: ""
+    location:
+      row: 8
+      column: 1
+    end_location:
+      row: 9
+      column: 1
+    applied: false
+

src/snapshots/ruff__linter__tests__u001.snap

@@ -0,0 +1,37 @@
+---
+source: src/linter.rs
+expression: checks
+---
+- kind: UselessMetaclassType
+  location:
+    row: 2
+    column: 5
+  end_location:
+    row: 2
+    column: 25
+  fix:
+    content: pass
+    location:
+      row: 2
+      column: 5
+    end_location:
+      row: 2
+      column: 25
+    applied: false
+- kind: UselessMetaclassType
+  location:
+    row: 6
+    column: 5
+  end_location:
+    row: 6
+    column: 25
+  fix:
+    content: ""
+    location:
+      row: 6
+      column: 1
+    end_location:
+      row: 7
+      column: 1
+    applied: false
+