autoblack.yml

name: autoblack
on: [pull_request]

env:
  PYTHON_VERSION: "3.12.1"

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
      - name: Set up Python ${{ env.PYTHON_VERSION }}
        uses: actions/setup-python@v4
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Install poetry using pipx
        run: |
          pipx install poetry
          pipx ensurepath

      - uses: actions/setup-python@v5
        with:
          python-version: "3.12.1"
          cache: "poetry"

      - name: Install dependencies
        run: |
          poetry config virtualenvs.in-project true
          poetry install --no-interaction --no-root --only linting

      - name: Run Black autoformatter
        run: poetry run black .

      - name: If needed, commit black changes to the pull request
        run: |
          git config user.name "$(git log -n 1 --pretty=format:%an)"
          git config user.email "$(git log -n 1 --pretty=format:%ae)"
          # short-circuit if we have no changes, otherwise attempt to commit and push
          # should only fail on forks, in which case contributors will need to manually run black, commit, and push
          git diff-index --quiet HEAD || (echo "Attempting to commit changes" && git commit -am 'lint with black' && git push -f)
      - name: Run black --check
        run: poetry run black --check .