release-version-bump.yml

# When a branch named release/X.Y.Z is pushed, set version = "X.Y.Z" in setup.py and commit.
# Branch name must match release/X.Y.Z (e.g. release/3.14.7). Creates one commit if version changed.

name: Release version bump

on:
  push:
    branches:
      - "release/*"

jobs:
  bump:
    runs-on: ubuntu-latest
    permissions:
      contents: write  # push commit to release branch

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.ref }}

      - name: Get version from branch name
        id: version
        run: |
          BRANCH="${{ github.ref_name }}"
          if [[ "$BRANCH" =~ ^release/(.+)$ ]]; then
            echo "version=${BASH_REMATCH[1]}" >> "$GITHUB_OUTPUT"
          else
            echo "Branch name must be release/X.Y.Z"
            exit 1
          fi

      - name: Update version in setup.py
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          sed -i 's/^version = ".*"/version = "'"$VERSION"'"/' setup.py
          grep -q '^version = "'"$VERSION"'"' setup.py || (echo "Failed to update setup.py"; exit 1)

      - name: Commit and push if changed
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          if git diff --quiet setup.py; then
            echo "Version already set, nothing to commit"
            exit 0
          fi
          git add setup.py
          git commit -m "chore: set version to ${{ steps.version.outputs.version }} [skip ci]"
          git push
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}