black.yml

name: Black
on: [push]
jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version: [3.8]

    steps:
      # git checkout
      - uses: actions/checkout@v2

      # python setup
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v1
        with:
          python-version: ${{ matrix.python-version }}

      # python cache
      - uses: actions/cache@v1
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
          restore-keys: |
            ${{ runner.os }}-pip-

       # install black (extract version from versions.cfg)
      - name: install black
        run: pip install click==$(awk '/^click =/{print $NF}' versions.cfg) black==$(awk '/^black =/{print $NF}' versions.cfg)

      # run black
      - name: run black
        run: black src/ --check --diff