name: Publish
on: [push]

jobs:
  publish:
    runs-on: ubuntu-18.04
    if: startsWith(github.event.ref, 'refs/tags/')

    steps:
    - uses: actions/checkout@v2

    - name: Set up Python 3.9
      uses: actions/setup-python@v2
      with:
        python-version: 3.9

    - name: Check Tag
      id: check-release-tag
      run: |
        if [[ ${{ github.event.ref }} =~ ^refs/tags/[0-9]+[.][0-9]+[.][0-9]+(rc[0-9]+|[.]dev[0-9]+)?$ ]]; then
          echo ::set-output name=release_tag::true
        fi

    - name: Publish to PyPI
      if: steps.check-release-tag.outputs.release_tag == 'true'
      run: |
        pip install --upgrade setuptools wheel twine
        python setup.py sdist bdist_wheel
        export TWINE_USERNAME=__token__
        export TWINE_PASSWORD=${{ secrets.PYPI_TOKEN }}
        twine upload dist/*