name: Lint

on:
  push:
    branches: ["**"]
  pull_request:
    branches: ["**"]

jobs:
  python-lint:
    name: Python (flake8)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Install Python and flake8
        run: |
          apt-get update -qq
          apt-get install -y -qq python3 python3-pip
          pip3 install flake8

      - name: Run flake8
        run: flake8 . --exclude=__pycache__,.git

  notify-failure:
    name: Notify on failure
    runs-on: ubuntu-latest
    needs: [python-lint]
    if: failure() && github.event_name == 'push'
    steps:
      - name: Send Matrix alert
        env:
          MATRIX_WEBHOOK_URL: ${{ secrets.MATRIX_WEBHOOK_URL }}
          REPO: ${{ github.repository }}
          BRANCH: ${{ github.ref_name }}
          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
        run: |
          if [ -z "$MATRIX_WEBHOOK_URL" ] || [ "$MATRIX_WEBHOOK_URL" = "CONFIGURE_ME" ]; then exit 0; fi
          curl -sf -X POST "$MATRIX_WEBHOOK_URL" \
            -H "Content-Type: application/json" \
            -d "{\"text\":\"CI FAILED: ${REPO} @ ${BRANCH} — ${RUN_URL}\"}"