build-wheels.yaml

name: Build

on:
  release:
    types: [published]
  # Enable manual run
  workflow_dispatch:

jobs:
  generate-wheels-matrix:
    # Create a matrix of all architectures & versions to build.
    # This enables the next step to run cibuildwheel in parallel.
    # From https://iscinumpy.dev/post/cibuildwheel-2-10-0/#only-210
    name: Generate wheels matrix
    runs-on: ubuntu-latest
    outputs:
      include: ${{ steps.set-matrix.outputs.include }}
    steps:
      - uses: actions/checkout@v4
      - name: Install cibuildwheel
        # Nb. keep cibuildwheel version pin consistent with job below
        run: pipx install cibuildwheel==2.16.5
      - id: set-matrix
        run: |
          MATRIX=$(
            {
              cibuildwheel --print-build-identifiers --platform linux \
              | jq -nRc '{"only": inputs, "os": "ubuntu-latest"}' \
              && cibuildwheel --print-build-identifiers --platform macos \
              | jq -nRc '{"only": inputs, "os": "macos-latest"}' \
              && cibuildwheel --print-build-identifiers --platform windows \
              | jq -nRc '{"only": inputs, "os": "windows-latest"}'
            } | jq -sc
          )
          echo "include=$MATRIX" >> $GITHUB_OUTPUT

  build_wheels:
    name: Build wheels on ${{ matrix.only }}
    needs: generate-wheels-matrix
    runs-on: ${{ matrix.os }}

    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJson(needs.generate-wheels-matrix.outputs.include) }}

    steps:
      - name: Check out the repo
        uses: actions/checkout@v4

      - name: Set up QEMU
        if: runner.os == 'Linux'
        uses: docker/setup-qemu-action@v3
        with:
          platforms: all

      - name: Build wheels
        uses: pypa/cibuildwheel@v2.16.5
        with:
          only: ${{ matrix.only }}

      - uses: actions/upload-artifact@v4
        with:
          name: cibw-wheels-${{ matrix.os }}-${{ strategy.job-index }}
          path: ./wheelhouse/*.whl

  build_sdist:
    name: Build source distribution
    runs-on: ubuntu-latest
    steps:
      - name: Check out the repo
        uses: actions/checkout@v4

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5

      - name: Build sdist (pep517)
        run: |
          python -m pip install pep517 numpy cython
          python -m pep517.build -s .

      - name: Upload sdist
        uses: actions/upload-artifact@v4
        with:
          name: cibw-sdist
          path: dist/*.tar.gz

  upload_release_assets:
    name: Upload Release Assets
    needs: [ build_wheels ]
    runs-on: ubuntu-latest
    if: startsWith(github.ref, 'refs/tags')

    steps:
      - name: Download bdist files
        id: download_artifact
        uses: actions/download-artifact@v4
        with:
          pattern: cibw-wheels-*
          path: ~/downloads
          merge-multiple: true

      - name: List downloaded artifacts
        run: ls -la ~/downloads

      - name: Upload to release
        uses: shogo82148/actions-upload-release-asset@v1.2.3
        with:
          upload_url: ${{ github.event.release.upload_url }}
          asset_path: ${{ steps.download_artifact.outputs.download-path }}/*.whl

  pypi_publish:
    name: PyPI Publish
    needs: [ build_wheels, build_sdist ]
    runs-on: ubuntu-latest
    permissions:
      id-token: write  # this permission is mandatory for trusted publishing
    if: startsWith(github.ref, 'refs/tags')

    steps:
      - name: Download bdist files
        uses: actions/download-artifact@v4
        with:
          pattern: cibw-*
          path: downloads/
          merge-multiple: true

      - name: Display structure of downloaded files
        run: ls -R downloads/

      - name: Publish packages to PyPI
        uses: pypa/gh-action-pypi-publish@release/v1
        with:
          packages_dir: downloads/