Walkthrough

The pull request removes the rustfmt formatting check from the CI lint job in .github/workflows/ci.yaml and introduces a new workflow file .github/workflows/pr-auto-commit.yaml that automatically formats Rust code in pull requests, commits changes, and posts status comments.

Changes

Sequence Diagram

sequenceDiagram
    actor GitHub as GitHub<br/>(PR Event)
    participant Workflow as PR Auto-format<br/>Workflow
    participant Rust as Rust/cargo fmt
    participant Git as Git<br/>(Push)
    participant API as GitHub API<br/>(PR Comment)

    GitHub->>Workflow: Trigger on pull_request_target
    Workflow->>Workflow: Check skip conditions<br/>(label, commit message)
    alt Skip Detected
        Workflow->>Workflow: Exit early
    else Proceed
        Workflow->>Workflow: Checkout PR branch
        Workflow->>Workflow: Wait for status checks
        Workflow->>Rust: Setup rustfmt toolchain
        Workflow->>Rust: Run cargo fmt --all
        Rust-->>Workflow: Format changes detected?
        alt Changes Found
            Workflow->>Git: Commit and push<br/>formatted code [skip ci]
            Git-->>Workflow: Success
            Workflow->>API: Post PR comment<br/>(formatting applied)
            API-->>Workflow: Comment posted
        else No Changes
            Workflow->>Workflow: Log: already formatted
        end
    end

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

• Examine the trigger conditions and skip logic in the new workflow to ensure edge cases are handled (PR labels, commit message filtering)
• Verify the conditional commit/push logic correctly detects formatting changes and applies [skip ci] tags to prevent recursive CI runs
• Confirm GitHub API permissions are sufficient for posting PR comments and pushing commits back to the PR branch

Possibly related PRs

• Revert "Update CI auto-format" #6236 — Directly related; reverses or opposes the same rustfmt/auto-format behavior changes in CI workflows
• Update CI auto-format #6233 — Directly related; makes identical CI changes—removing rustfmt from lint job and adding PR auto-format workflow
• Update CI auto-formate #6237 — Directly related; implements the same workflow modifications for automatic code formatting in PRs

Suggested reviewers

• youknowone

Poem

🐰 In workflows so clean, a rabbit did scheme,
Removing old checks for a formatting dream—
Now PRs auto-bloom with fmt's gentle touch,
No manual fussing, we loved this so much! ✨

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