name: CI
on:
  pull_request:
  push:
    branches: [main]

concurrency:
  # prettier-ignore
  group: >-
    ${{ github.workflow }}-
    ${{ github.ref_type }}-
    ${{ github.event.pull_request.number || github.sha }}
  cancel-in-progress: true

jobs:
  tests:
    name: tests / ${{ matrix.os }} / ${{ matrix.python-version }}
    runs-on: ${{ matrix.os }}-latest

    strategy:
      matrix:
        os: [Windows, Ubuntu, MacOS]
        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
        include:
          # Only run PyPy jobs, on Ubuntu.
          - os: Ubuntu
            python-version: pypy-3.7

    steps:
      - uses: actions/checkout@v3

      # Get Python to test against
      - uses: actions/setup-python@v4
        with:
          python-version: ${{ matrix.python-version }}

      # Setup pip's cache
      - name: Save date (for cache)
        id: date
        run: echo "::set-output name=date::$(date +%F)"
      - name: Save pip cache dir
        id: pip-cache-dir
        run: echo "::set-output name=dir::$(pip cache dir)"
      - name: pip cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.pip-cache-dir.outputs.dir }}
          key: pip-v1-${{ runner.os }}-${{ steps.date.outputs.date }}
          restore-keys: pip-v1-${{ runner.os }}

      - run: pip install nox

      # prettier-ignore
      - run: >
          nox
          -s test-${{ matrix.python-version }}
          doctest-${{ matrix.python-version }}
          --error-on-missing-interpreters
        if: matrix.python-version != 'pypy-3.7'

      - run: nox --error-on-missing-interpreters -s test-pypy3 doctest-pypy3
        if: matrix.python-version == 'pypy-3.7'