Excludes match against parent directories outside of the project when formatting through the language server

[kageurufu]

Description

Non-relative paths in ruff.exclude match against parent directories outside of the project.

My working path is $HOME/src/<project>/ and with tool.ruff.extend-exclude = ['src'] set the ruff language server will not format any python within ~/src/project/.
Calling ruff format on the command line works normally.

• Version: Ruff 0.9.7
• Minimal snippet

  mkdir -p ~/src
  uv init ~/src/test-ruff-exclude
  cd ~/src/test-ruff-exclude
  echo 'exclude = ["src"]' >> ruff.toml
  

• Invoked using the VSCode ruff extension, however any lsp integration could trigger this
• Keywords searched: "exclude", "directory"

LSP Trace:

[Trace - 10:16:19 AM] Sending request 'textDocument/formatting - (28)'.
Params: {
    "textDocument": {
        "uri": "file:///home/frank/src/ruff-exclude-ex/hello.py"
    },
    "options": {
        "tabSize": 4,
        "insertSpaces": true
    }
}


[Trace - 10:16:19 AM] Received response 'textDocument/formatting - (28)' in 0ms.
No result returned.

[MichaReiser]

I'm not sure I follow. Let me explain what I understand:

• You open the $HOME/src/project directory in VS code
• The ruff.toml in the src directory contains exclude = ["src"]
• You run ruff in $HOME/src/project and it formats all files in that directory except the files in `src
• VS Code doesn't format the files because it incorrectly thinks that the exclude src matches $HOME/src

Is this accurate?

[kageurufu]

Yes, exactly.

I believe the language server is not detecting the project root

[MichaReiser]

@dhruvmanila is our LSP expert. I wonder if we incorrectly anchor exclude (or not anchor it at all)