autoblack.yml

# GitHub Action that uses Black to reformat the Python code in an incoming pull request.
# If all Python code in the pull request is compliant with Black then this Action does nothing.
# Otherwise, Black is run and its changes are committed back to the incoming pull request.
# https://github.com/cclauss/autoblack

name: autoblack
on: [pull_request]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1
      - name: Set up Python 3.7
        uses: actions/setup-python@v1
        with:
          python-version: 3.7
      - name: Install Black
        run: pip install black
      - name: Run black --check .
        run: black --check .
      - name: If needed, commit black changes to the pull request
        if: failure()
        run: |
          black .
          git config user.name github-actions
          git config user.email github-actions@github.com
          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
          git checkout $GITHUB_HEAD_REF
          git commit -am "fixup: Format Python code with Black"
          git push