flake8.yaml

name: flake8

# since we're only checking PR diffs, only trigger on the pull_request event type.
# note: the pull_request event happens on opened, reopened, and synchronize activities;
# synchronize includes commits being pushed to the PR branch.
# https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#pull_request
on: [pull_request]

jobs:
  lint:

    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [3.8]

    steps:
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0  # fetch all branches, needed so we can diff against the target branch
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install flake8
      run: |
        python -m pip install --upgrade pip
        pip install flake8
    - name: List changed files
      run: |
        git diff --compact-summary "origin/$GITHUB_BASE_REF"
    - name: Run linter
      run: |
        flake8 . --config=.flake8 --count --statistics --show-source