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@github-actions github-actions released this 18 Apr 19:53
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v0.4.0
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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.

  • Enable ruff-specific source actions (#10916)
  • Refreshes diagnostics for open files when file configuration is changed (#10988)
  • Important errors are now shown as popups (#10951)
  • Introduce settings for directly configuring the linter and formatter (#10984)
  • Resolve configuration for each document individually (#10950)
  • Write a setup guide for Neovim (#10987)

Configuration

  • Add RUFF_OUTPUT_FILE environment variable support (#10992)

Bug fixes

  • Avoid non-augmented-assignment for reversed, non-commutative operators (PLR6104) (#10909)
  • Limit commutative non-augmented-assignments to primitive data types (PLR6104) (#10912)
  • Respect per-file-ignores for RUF100 on blanket # noqa (#10908)
  • Consider if expression for parenthesized with items parsing (#11010)
  • Consider binary expr for parenthesized with items parsing (#11012)
  • Reset FOR_TARGET context for all kinds of parentheses (#11009)

Contributors

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