format-check.yml

name: format-python
on: pull_request
jobs:
  format:
    # Check if the PR is not from a fork
    if: github.event.pull_request.head.repo.full_name == github.repository
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1
        with:
          ref: ${{ github.head_ref }}
      - name: black
        uses: lgeiger/black-action@v1.0.1
        with:
          args: .
      - name: Check for modified files
        id: git-check
        run: if git diff-index HEAD --; then echo "Code formatting inconsistent. Please format using Black." && exit 1; else echo "Code formatting is consistent with Black."; fi