Respect tab-size setting in formatter

[MichaReiser]

Summary

This PR changes the formatter to use the global tab-size to configure the number of spaces used for soft-tabs or width of a hard-tab character.

Closes #7648

Open Questions

I'm still somewhat undecided whether we should support changing the number of spaces for soft tabs. I only found few projects that set tab-size = 2 or pyink-indentation = 2.
But we may as well support it for as long as we default to 4 spaces.

Test Plan

Changed integration test

[MichaReiser]

Current dependencies on/for this PR:

• main
  • PR Add [format|lint].exclude options #8000
    • PR Add lint.preview #8002
      • PR Document lint.preview and format.preview #8032
      • PR Respect tab-size setting in formatter #8006 👈
        • PR Respect #(deprecated) attribute in configuration options #8035
          • PR Rename *-length options to -width #8010
            • PR Rename tab-size to indent-width #8082
              • PR Warn about incompatible formatter options #8088
            • PR New pycodestyle.max-line-length option #8039
        • PR Options: Support #[serde(alias = name)] #8031

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PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

[charliermarsh]

Cool, so this both respects the tab width for tab-based indentation and allows changing the number of spaces?

[eli-schwartz]

Maybe this should look at .editorconfig as well?

[MichaReiser]

Cool, so this both respects the tab width for tab-based indentation and allows changing the number of spaces?

That's correct. It's the one setting that configures the indentation.

Maybe this should look at .editorconfig as well?

We may want to support a ruff init command eventually that copies the relevant settings from the editorconfig. We want to avoid reading the editorconfig ourselves because it then becomes unclear how it would interact with configuration inheritance and it slows down the file traversal (because it increases the number of configuration files that ruff needs to probe for every directory)

[NeilGirdhar]

I'm still somewhat undecided whether we should support changing the number of spaces for soft tabs. I only found few projects that set tab-size = 2

Do you mean editor-config's indent size? If so, Google's Python style guide has it set to two. So that's practically every Google project.

[MichaReiser]

I'm still somewhat undecided whether we should support changing the number of spaces for soft tabs. I only found few projects that set tab-size = 2

Do you mean editor-config's indent size? If so, Google's Python style guide has it set to two. So that's practically every Google project.

Yes, that's what I was considering. We decided to support configuring the number of spaces.