esp-idf/.github/workflows/pre_commit_check.yml

name: Check pre-commit rules

on:
  pull_request:
    types: [opened, reopened, synchronize]

jobs:
  pre_commit_check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Fetch head and base refs
        # This is necessary for pre-commit to check the changes in the PR branch
        run: |
          git fetch origin ${{ github.base_ref }}:base_ref
          git fetch origin pull/${{ github.event.pull_request.number }}/head:pr_ref
      - name: Set up Python environment
        uses: actions/setup-python@master
        with:
          python-version: v3.7
      - name: Install python packages
        run: |
          pip install pre-commit
          pre-commit install-hooks
      - name: Run pre-commit and check for any changes
        run: |
          echo "Commits being checked:"
          git log --oneline --no-decorate base_ref..pr_ref
          echo ""
          if ! pre-commit run --from-ref base_ref --to-ref pr_ref --show-diff-on-failure ; then
            echo ""
            echo "::notice::It looks like the commits in this PR have been made without having pre-commit hooks installed."
            echo "::notice::Please see https://docs.espressif.com/projects/esp-idf/en/latest/esp32/contribute/install-pre-commit-hook.html for instructions."
            echo ""
            exit 1
          fi