Sourced from ruff's releases.

v0.4.0

Changes

A new, hand-written parser

Ruff's new parser is >2x faster, which translates to a 20-40% speedup for all linting and formatting invocations. There's a lot to say about this exciting change, so check out the blog post for more details!

See #10036 for implementation details.

A new language server in Rust

With this release, we also want to highlight our new language server. ruff server is a Rust-powered language server that comes built-in with Ruff. It can be used with any editor that supports the Language Server Protocol (LSP). It uses a multi-threaded, lock-free architecture inspired by rust-analyzer and it will open the door for a lot of exciting features. It’s also faster than our previous Python-based language server -- but you probably guessed that already.

ruff server is only in alpha, but it has a lot of features that you can try out today:

• Lints Python files automatically and shows quick-fixes when available
• Formats Python files, with support for range formatting
• Comes with commands for quickly performing actions: ruff.applyAutofix, ruff.applyFormat, and ruff.applyOrganizeImports
• Supports source.fixAll and source.organizeImports source actions
• Automatically reloads your project configuration when you change it

To setup ruff server with your editor, refer to the README.md.

Preview features

• [pycodestyle] Do not trigger E3 rules on defs following a function/method with a dummy body (#10704)
• [pylint] Implement invalid-bytes-returned (E0308) (#10959)
• [pylint] Implement invalid-length-returned (E0303) (#10963)
• [pylint] Implement self-cls-assignment (W0642) (#9267)
• [pylint] Omit stubs from invalid-bool and invalid-str-return-type (#11008)
• [ruff] New rule unused-async (RUF029) to detect unneeded async keywords on functions (#9966)

Rule changes

• [flake8-bandit] Allow urllib.request.urlopen calls with static Request argument (S310) (#10964)
• [flake8-bugbear] Treat raise NotImplemented-only bodies as stub functions (B006) (#10990)
• [flake8-slots] Respect same-file Enum subclasses (SLOT000) (#11006)
• [pylint] Support inverted comparisons (PLR1730) (#10920)

Linter

• Improve handling of builtin symbols in linter rules (#10919)
• Improve display of rules in --show-settings (#11003)
• Improve inference capabilities of the BuiltinTypeChecker (#10976)
• Resolve classes and functions relative to script name (#10965)
• Improve performance of RuleTable::any_enabled (#10971)

Server

This section is devoted to updates for our new language server, written in Rust.

... (truncated)

Sourced from ruff's changelog.

0.4.0

A new, hand-written parser

Ruff's new parser is >2x faster, which translates to a 20-40% speedup for all linting and formatting invocations. There's a lot to say about this exciting change, so check out the blog post for more details!

See #10036 for implementation details.

A new language server in Rust

With this release, we also want to highlight our new language server. ruff server is a Rust-powered language server that comes built-in with Ruff. It can be used with any editor that supports the Language Server Protocol (LSP). It uses a multi-threaded, lock-free architecture inspired by rust-analyzer and it will open the door for a lot of exciting features. It’s also faster than our previous Python-based language server -- but you probably guessed that already.

ruff server is only in alpha, but it has a lot of features that you can try out today:

• Lints Python files automatically and shows quick-fixes when available
• Formats Python files, with support for range formatting
• Comes with commands for quickly performing actions: ruff.applyAutofix, ruff.applyFormat, and ruff.applyOrganizeImports
• Supports source.fixAll and source.organizeImports source actions
• Automatically reloads your project configuration when you change it

To setup ruff server with your editor, refer to the README.md.

Preview features

• [pycodestyle] Do not trigger E3 rules on defs following a function/method with a dummy body (#10704)
• [pylint] Implement invalid-bytes-returned (E0308) (#10959)
• [pylint] Implement invalid-length-returned (E0303) (#10963)
• [pylint] Implement self-cls-assignment (W0642) (#9267)
• [pylint] Omit stubs from invalid-bool and invalid-str-return-type (#11008)
• [ruff] New rule unused-async (RUF029) to detect unneeded async keywords on functions (#9966)

Rule changes

• [flake8-bandit] Allow urllib.request.urlopen calls with static Request argument (S310) (#10964)
• [flake8-bugbear] Treat raise NotImplemented-only bodies as stub functions (B006) (#10990)
• [flake8-slots] Respect same-file Enum subclasses (SLOT000) (#11006)
• [pylint] Support inverted comparisons (PLR1730) (#10920)

Linter

• Improve handling of builtin symbols in linter rules (#10919)
• Improve display of rules in --show-settings (#11003)
• Improve inference capabilities of the BuiltinTypeChecker (#10976)
• Resolve classes and functions relative to script name (#10965)
• Improve performance of RuleTable::any_enabled (#10971)

... (truncated)

• e751b4e Bump version to 0.4.0 (#11011)
• 25a9131 Add myself as codeowner for the parser (#11013)
• b7066e6 Consider binary expr for parenthesized with items parsing (#11012)
• 6c4d779 Consider if expression for parenthesized with items parsing (#11010)
• 8020d48 Reset FOR_TARGET context for all kinds of parentheses (#11009)
• 13ffb5b Replace LALRPOP parser with hand-written parser (#10036)
• e09180b Rename SemanticModel::is_builtin to SemanticModel::has_builtin_binding (#...
• 2cc487e ruff server: Introduce settings for directly configuring the linter and for...
• 5da7299 ruff server: Write a setup guide for Neovim (#10987)
• 4d8890e [pylint] Omit stubs from invalid-bool and invalid-str-return-type (#11008)
• Additional commits viewable in compare view

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