publish.yml

---
name: release

concurrency:
  group: release
  cancel-in-progress: true

on: release

permissions:
    contents: read

jobs:

  detect-versions:
    runs-on: ubuntu-latest
    outputs:
      branch-exists: ${{ steps.branch-exists.outputs.exists }}
      version: v${{ steps.version.outputs.value }}
    steps:
      - uses: actions/checkout@v4

      # Detect version from pyproject.toml
      - uses: SebRollen/toml-action@v1.2.0
        id: version
        with:
          file: './pyproject.toml'
          field: project.version

      - uses: GuillaumeFalourd/branch-exists@v1
        id: branch-exists
        with:
          branch: v${{ steps.version.outputs.value }}

      - name: Fail on branch conflict
        if: steps.branch-exists.outputs.exists == 'true'
        shell: bash
        run: |
            echo "ERROR: A branch already exists called v${{ steps.version.outputs.value }}"
            echo "       Update package.json to refer to a new version."
            exit 1


  # The below code is commented out because it works, except for a Github auth issue.
  # Ref: https://github.com/orgs/community/discussions/13836

  # When the PR gets merged, cut a new version branch.
  merge:
    needs: detect-versions
    if: needs.detect-versions.outputs.branch-exists == 'false'
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4

      - name: Create a new version branch
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        shell: bash
        run: |
          git checkout -b ${{ needs.detect-versions.outputs.version }}
          git push -u origin ${{ needs.detect-versions.outputs.version }}