main.yml

name: Matrix Test
on:
  push:
    branches: [main, devel]
  pull_request:
    branches: [main, devel]

jobs:
  run-if-changes:
    runs-on: ubuntu-latest
    outputs:
      run: ${{ (github.event_name == 'push' && github.ref_name == 'main') && 'true' || steps.filter.outputs.python }}
    steps:
      - uses: actions/checkout@v6
      - uses: dorny/paths-filter@v4
        id: filter
        with:
          filters: |
            python:
              - 'ultraplot/**'
              - 'pyproject.toml'
              - 'environment.yml'
              - '.github/workflows/**'
              - 'tools/ci/**'

  select-tests:
    runs-on: ubuntu-latest
    needs:
      - run-if-changes
    if: always() && needs.run-if-changes.outputs.run == 'true'
    outputs:
      mode: ${{ steps.select.outputs.mode }}
      tests: ${{ steps.select.outputs.tests }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Prepare workspace
        run: mkdir -p .ci

      - name: Restore test map cache
        id: restore-map
        uses: actions/cache/restore@v5
        with:
          path: .ci/test-map.json
          key: test-map-${{ github.event.pull_request.base.sha }}
          restore-keys: |
            test-map-

      - name: Build test map on cache miss
        if: steps.restore-map.outputs.cache-hit != 'true'
        uses: mamba-org/setup-micromamba@v3.0.0
        with:
          environment-file: ./environment.yml
          init-shell: bash
          create-args: >-
            --verbose
            python=3.10
            matplotlib=3.9
          cache-environment: true
          cache-downloads: false

      - name: Generate test map on cache miss
        if: steps.restore-map.outputs.cache-hit != 'true'
        shell: bash -el {0}
        run: |
          echo "Test map cache miss; generating map from tests."
          pip install --no-build-isolation --no-deps .
          mkdir -p .ci
          pytest -q --tb=short --disable-warnings -n auto -p pytest_cov \
            --cov=ultraplot --cov-branch --cov-context=test --cov-report= \
            ultraplot/tests
          python tools/ci/build_test_map.py --coverage-file .coverage --output .ci/test-map.json --root .

      - name: Select impacted tests
        id: select
        run: |
          if [ "${{ github.event_name }}" != "pull_request" ]; then
            echo "mode=full" >> $GITHUB_OUTPUT
            echo "tests=[]" >> $GITHUB_OUTPUT
            exit 0
          fi

          git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }} > .ci/changed.txt
          echo "Changed files:"
          cat .ci/changed.txt || true
          echo "Test map exists:"
          if [ -f .ci/test-map.json ]; then
            echo "yes (size=$(wc -c < .ci/test-map.json))"
          else
            echo "no"
          fi

          python tools/ci/select_tests.py \
            --map .ci/test-map.json \
            --changed-files .ci/changed.txt \
            --output .ci/selection.json \
            --always-full 'pyproject.toml' \
            --always-full 'environment.yml' \
            --always-full 'ultraplot/__init__.py' \
            --ignore 'docs/**' \
            --ignore 'README.rst'
          echo "Selection output:"
          cat .ci/selection.json || true

          python - <<'PY' > .ci/selection.out
          import json
          data = json.load(open(".ci/selection.json", "r", encoding="utf-8"))
          print(f"mode={data['mode']}")
          print("tests=" + json.dumps(data.get("tests", []), separators=(",", ":")))
          PY
          cat .ci/selection.out >> $GITHUB_OUTPUT

  get-versions:
    runs-on: ubuntu-latest
    needs:
      - run-if-changes
    if: always() && needs.run-if-changes.outputs.run == 'true'
    outputs:
      python-versions: ${{ steps.set-versions.outputs.python-versions }}
      matplotlib-versions: ${{ steps.set-versions.outputs.matplotlib-versions }}
      test-matrix: ${{ steps.set-versions.outputs.test-matrix }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - uses: actions/setup-python@v6
        with:
          python-version: "3.11"

      - id: set-versions
        run: |
          OUTPUT=$(python tools/ci/version_support.py)
          echo "Detected Python versions: $(echo "$OUTPUT" | jq -c '.python_versions')"
          echo "Detected Matplotlib versions: $(echo "$OUTPUT" | jq -c '.matplotlib_versions')"
          echo "Detected test matrix: $(echo "$OUTPUT" | jq -c '.test_matrix')"
          python tools/ci/version_support.py --format github-output >> $GITHUB_OUTPUT

  coverage:
    name: Coverage
    runs-on: ubuntu-latest
    needs:
      - run-if-changes
    if: always() && needs.run-if-changes.outputs.run == 'true' && github.event_name == 'pull_request'
    defaults:
      run:
        shell: bash -el {0}
    steps:
      - name: Set up swap space
        uses: pierotofy/set-swap-space@master
        with:
          swap-size-gb: 10

      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - uses: mamba-org/setup-micromamba@v3.0.0
        with:
          environment-file: ./environment.yml
          init-shell: bash
          condarc-file: ./.github/micromamba-condarc.yml
          post-cleanup: none
          create-args: >-
            --verbose
            python=3.10
            matplotlib=3.9
          cache-environment: true
          cache-downloads: false

      - name: Build Ultraplot
        run: |
          pip install --no-build-isolation --no-deps .

      - name: Run full coverage suite
        run: |
          pytest -q --tb=short --disable-warnings -n auto -p pytest_cov \
            --cov=ultraplot --cov-branch --cov-context=test \
            --cov-report=xml:coverage.xml --cov-report= \
            ultraplot/tests

      - name: Upload coverage reports to Codecov
        uses: codecov/codecov-action@v6
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          files: ./coverage.xml
          name: codecov-pr-python3.10-mpl3.9

  build:
    needs:
      - get-versions
      - run-if-changes
      - select-tests
    if: always() && needs.run-if-changes.outputs.run == 'true' && needs.get-versions.result == 'success' && needs.select-tests.result == 'success'
    strategy:
      matrix:
        include: ${{ fromJson(needs.get-versions.outputs.test-matrix) }}
      fail-fast: false
      max-parallel: 4
    uses: ./.github/workflows/build-ultraplot.yml
    concurrency:
      group: ${{ github.workflow }}-${{ github.ref }}-${{ matrix.python-version }}-${{ matrix.matplotlib-version }}
      cancel-in-progress: false
    with:
      python-version: ${{ matrix.python-version }}
      matplotlib-version: ${{ matrix.matplotlib-version }}
      test-mode: ${{ needs.select-tests.outputs.mode }}
      test-nodeids: ${{ needs.select-tests.outputs.tests }}

  build-success:
    needs:
      - build
      - run-if-changes
    if: always()
    runs-on: ubuntu-latest
    steps:
      - run: |
          if [[ '${{ needs.run-if-changes.outputs.run }}' == 'false' ]]; then
            echo "No changes detected, tests skipped."
          else
            if [[ '${{ needs.build.result }}' == 'success' ]]; then
              echo "All tests passed successfully!"
            else
              echo "Tests failed!"
              exit 1
            fi
          fi