black-format.yml

name: Black Auto-Reformat

on:
  pull_request:
    branches:
      - main
    paths:
      - '**.py'

jobs:
  black-format:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Setup Python
        uses: actions/setup-python@v4
        with:
          python-version: 3.8

      - name: Install Black
        run: |
          pip install --upgrade pip
          pip install black

      - name: Format with Black
        run: |
          CHANGED_FILES=$(git diff --name-only --diff-filter=dr HEAD^..HEAD | grep -E '\.(py)$' || true)
          echo "Changed files: ${CHANGED_FILES}"
          if [ ! -z "$CHANGED_FILES" ]; then
            black $CHANGED_FILES
          fi

      - name: Commit and Push Changes
        if: success() && github.ref != 'refs/heads/main'
        run: |
          git config --global user.name 'github-actions'
          git config --global user.email 'github-actions@github.com'
          git add .
          # Check if there are any changes to commit
          if git diff --staged --quiet; then
            echo "No changes to commit"
          else
            git commit -m "Apply Black Formatting"
            BRANCH_NAME=${GITHUB_HEAD_REF:-$(git rev-parse --abbrev-ref HEAD)}
            git push origin HEAD:$BRANCH_NAME  # TODO: Will ALWAYS fail due to the writing authorization.
          fi