pr-version-check.yml

name: Main Branch Pull Request Version Check

on:
  pull_request:
    branches: [main]

permissions:
  contents: read

jobs:
  version-check:
    name: Check version bump
    runs-on: ubuntu-latest
    steps:
      - name: Checkout PR branch
        uses: actions/checkout@v7

      - name: Read PR version
        id: pr_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"

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

      - name: Install uv
        uses: astral-sh/setup-uv@ae62891fec2bb8e7d6c99fc78c9fec3a63790f8d

      - name: Compare versions
        run: |
          PR_VERSION="${{ steps.pr_version.outputs.version }}"
          MAIN_VERSION="${{ steps.main_version.outputs.version }}"
          echo "PR version: $PR_VERSION"
          echo "main version: $MAIN_VERSION"
          uv run --with packaging python3 - "$PR_VERSION" "$MAIN_VERSION" <<'EOF'
          import sys
          from packaging.version import Version, InvalidVersion

          pr_raw, main_raw = sys.argv[1], sys.argv[2]

          try:
              pr = Version(pr_raw)
              main = Version(main_raw)
          except InvalidVersion as e:
              print(f"Could not parse version as PEP 440: {e}", file=sys.stderr)
              sys.exit(1)

          if pr <= main:
              print(f'Version in pyproject.toml ({pr_raw}) is not greater than main ({main_raw}). Versions must strictly increase.', file=sys.stderr)
              sys.exit(1)

          print(f'OK: {pr_raw} > {main_raw}')
          EOF