Action-black

This action runs the black formatter to check/format your code on a push or pull request.

Inputs

black_args

optional: Black input arguments. Defaults to . --check --diff.

fail_on_error

optional: Exit code when black formatting errors are found [true, false]. Defaults to 'true'.

Outputs

is_formatted

Boolean specifying whether any files were formatted using the black formatter.

Basic usage

In it's simplest form this action can be used to check/format your code using the black formatter.

name: reviewdo
on: [push, pull_request]
jobs:
  linter_name:
    name: runner / black formatter
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: reviewdog/action-black@v1
        with:
          black_args: ". --check"

Advanced use cases

Annotate changes

This action can be combined with reviewdog/action-suggester also to annotate any possible changes (uses git diff).

name: reviewdog
on: [push, pull_request]
jobs:
  name: runner / black
  runs-on: ubuntu-latest
  steps:
    - uses: actions/checkout@v2
    - name: Check files using black formatter
      uses: rickstaa/action-black@v1
      id: action-black
      with:
        black_args: "."
    - name: Annotate diff changes using reviewdog
      if: steps.action-black.outputs.is_formatted == 'true'
      uses: reviewdog/action-suggester@v1
      with:
        tool_name: blackfmt

Commit changes or create a pull request

This action can be combined with peter-evans/create-pull-request to also apply the annotated changes to the repository.

name: reviewdog
on: [push, pull_request]
jobs:
  name: runner / black
  runs-on: ubuntu-latest
  steps:
    - uses: actions/checkout@v2
    - name: Check files using black formatter
      uses: rickstaa/action-black@v1
      id: action-black
      with:
        black_args: "."
    - name: Create Pull Request
      if: steps.action-black.outputs.is_formatted == 'true'
      uses: peter-evans/create-pull-request@v3
      with:
        token: ${{ secrets.GITHUB_TOKEN }}
        title: "Format Python code with psf/black push"
        commit-message: ":art: Format Python code with psf/black"
        body: |
          There appear to be some python formatting errors in ${{ github.sha }}. This pull request
          uses the [psf/black](https://github.com/psf/black) formatter to fix these issues.
        branch: actions/black