name: Linting with flake8

on: [push, pull_request]

jobs:
  flake8-lint:
    runs-on: ubuntu-latest
    name: lint
    steps:
      - name: Check out source repository
        uses: actions/checkout@v2
      - name: Set up Python ${{ matrix.python-version }} environment
        uses: actions/setup-python@v2
        with:
          python-version: "3.9"

      - name: Perform mandatory flake8 linting
        run: |
          pip install flake8
          flake8 --version
          flake8 . --count --select=E11,E12,E22,E25,E26,E3,E71,E9,F63,F7,F82,F84,W3,W503 --ignore=F821 --show-source --statistics

      - name: Perform optional exit-zero flake8 linting
        run: |
          flake8 . --exit-zero --statistics --count