rustfmt-check

GitHub Action to format Rust code using rustfmt.

This action can be used to keep Rust code formatted correctly.

Modes

This action supports three different modes. The commit mode is the default mode.

Commit

A commit is pushed when formatting is required.

Example

on: push

name: Rustfmt

jobs:
  format:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt
      - uses: mbrobbel/rustfmt-check@master
        with:
          token: ${{ secrets.GITHUB_TOKEN }}

Review

The action reviews the PR, either requesting formatting changes, or approving if no formatting is required.

Example

on: pull_request

name: Rustfmt

jobs:
  format:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@nightly
        with:
          components: rustfmt
      - uses: mbrobbel/rustfmt-check@master
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          mode: review

Please note that this mode requires:

• A nightly Rust toolchain
• Allowing GitHub Actions to create or approve pull reqeuests.

Pull request

The action creates a pull request with the formatting changes.

Example

on: pull_request

name: Rustfmt

jobs:
  format:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt
      - uses: mbrobbel/rustfmt-check@master
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          mode: pull

Please note that this mode requires:

• Allowing GitHub Actions to create or approve pull reqeuests.

Arguments

See action.yml.