package-python-extension.yml

name: Package Python Extension

on:
  pull_request:
    types: [opened, synchronize, reopened, ready_for_review]

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  find-extensions:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      extensions: ${{ steps.get-extensions.outputs.extensions }}
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0

      - name: Get changed extension files
        id: get-extensions
        run: |
          BASE_REF="${{ github.event.pull_request.base.ref }}"
          git diff --name-only --diff-filter=AM "origin/$BASE_REF"...HEAD \
            | grep -E '\.json$' > /tmp/changed_files.txt || true
          echo "Changed JSON files:"
          cat /tmp/changed_files.txt || echo "(none)"

          python3 << 'PYEOF'
          import json, os

          extensions = []
          with open("/tmp/changed_files.txt") as fh:
              changed_files = [line.strip() for line in fh if line.strip()]

          for f in changed_files:
              if not os.path.isfile(f):
                  continue
              with open(f) as fh:
                  data = json.load(fh)
              scm_url = data.get("scm_url", "")
              scm_revision = data.get("scm_revision", "main")
              if "github.com/" not in scm_url:
                  continue
              repo = scm_url.split("github.com/")[1].rstrip("/")
              name = os.path.splitext(os.path.basename(f))[0]
              extensions.append({"name": name, "repo": repo, "revision": scm_revision})

          output = json.dumps(extensions)
          with open(os.environ["GITHUB_OUTPUT"], "a") as fh:
              fh.write(f"extensions={output}\n")
          print(f"Found {len(extensions)} extension(s): {output}")
          PYEOF

  package:
    needs: find-extensions
    if: needs.find-extensions.outputs.extensions != '[]'
    name: Package ${{ matrix.extension.name }} on ${{ matrix.os.name }}
    runs-on: ${{ matrix.os.runner }}
    strategy:
      fail-fast: false
      matrix:
        extension: ${{ fromJson(needs.find-extensions.outputs.extensions) }}
        os:
          - runner: windows-latest
            name: Windows
          - runner: ubuntu-latest
            name: Linux
          # Disable Intel macOS configuration, as runners are often not available for many hours.
          # - runner: macos-13
          #   name: macOS
    steps:
      - name: Checkout extension
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          repository: ${{ matrix.extension.repo }}
          ref: ${{ matrix.extension.revision }}

      - name: Check for C++ source files
        id: check-cpp
        shell: bash
        run: |
          if find . \( -name "*.cxx" -o -name "*.h" \) | grep -q .; then
            echo "C++ source files found - skipping packaging test"
            echo "skip=true" >> $GITHUB_OUTPUT
          else
            echo "Python-only extension - proceeding with packaging test"
            echo "skip=false" >> $GITHUB_OUTPUT
          fi

      - name: Checkout Slicer source
        if: steps.check-cpp.outputs.skip != 'true'
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          repository: lassoan/Slicer
          ref: python-ext-build
          path: _slicer_src

      - name: Set up Python
        if: steps.check-cpp.outputs.skip != 'true'
        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
        with:
          python-version: "3.x"

      - name: Set up CMake
        if: steps.check-cpp.outputs.skip != 'true'
        uses: jwlawson/actions-setup-cmake@v2
        with:
          cmake-version: latest

      - name: Package extension
        if: steps.check-cpp.outputs.skip != 'true'
        shell: bash
        run: |
          python "${{ github.workspace }}/_slicer_src/Utilities/Scripts/package_python_extension.py" \
            --ext-src "${{ github.workspace }}" \
            --slicer-src "${{ github.workspace }}/_slicer_src" \
            --build-dir "${{ runner.temp }}/ext-build" \
            --dummy-build "${{ runner.temp }}/SlicerDummyBuild" \
            --output-dir "${{ github.workspace }}/packages" \
            --slicer-revision "python-ext-build" \
            --cmake-arg "-DBUILD_TESTING=OFF"

      - name: Upload package artifact
        if: steps.check-cpp.outputs.skip != 'true'
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: package-${{ matrix.extension.name }}-${{ matrix.os.name }}
          path: packages/
          if-no-files-found: error