name: CI
on:
  - push
  - pull_request
jobs:
  test:
    runs-on: ubuntu-20.04
    strategy:
      fail-fast: false
      matrix:
        python-version:
          - "2.7"
          - "3.5"
          - "3.6"
          - "3.7"
          - "3.8"
          - "3.9"
          - "3.10"
    steps:
      - uses: actions/checkout@v3
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install ffmpeg
        run: |
          sudo apt update
          sudo apt install ffmpeg
      - name: Setup pip + tox
        run: |
          python -m pip install --upgrade \
            "pip==20.3.4; python_version < '3.6'" \
            "pip==21.3.1; python_version >= '3.6'"
          python -m pip install tox==3.24.5 tox-gh-actions==2.9.1
      - name: Test with tox
        run: tox
  black:
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v3
      - name: Black
        run: |
          # TODO: use standard `psf/black` action after dropping Python 2 support.
          pip install black==21.12b0 click==8.0.2  # https://stackoverflow.com/questions/71673404
          black ffmpeg --check --color --diff