tag-release.yml

# Auto-tag when merging to main
#
# Reads the version from pyproject.toml and, if the matching tag does not
# already exist, creates and pushes it, then triggers the release workflow
# (build + publish to PyPI + GitHub Release).
name: Tag Release

on:
  push:
    branches:
      - main

permissions:
  contents: write
  actions: write

jobs:
  tag:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get version from pyproject.toml
        id: version
        run: |
          VERSION=$(grep -m1 '^version = ' pyproject.toml | sed -E 's/^version = "(.*)"/\1/')
          if [ -z "$VERSION" ]; then
            echo "Could not read version from pyproject.toml" >&2
            exit 1
          fi
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          echo "Version: $VERSION"

      - name: Check if tag exists
        id: check_tag
        run: |
          if git rev-parse "v${{ steps.version.outputs.version }}" >/dev/null 2>&1; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
            echo "Tag v${{ steps.version.outputs.version }} already exists"
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
            echo "Tag v${{ steps.version.outputs.version }} does not exist"
          fi

      - name: Create and push tag
        if: steps.check_tag.outputs.exists == 'false'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag -a "v${{ steps.version.outputs.version }}" -m "Release v${{ steps.version.outputs.version }}"
          git push origin "v${{ steps.version.outputs.version }}"

      - name: Trigger release workflow
        if: steps.check_tag.outputs.exists == 'false'
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.actions.createWorkflowDispatch({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: 'release.yml',
              ref: 'v${{ steps.version.outputs.version }}'
            })