name: PR title

on:
  # Every base, so stacked pull requests are checked against the PR below them.
  pull_request:
    types: [opened, synchronize, reopened, edited]
  # A queued change was checked as a pull request; the queue still needs the result.
  merge_group:

permissions:
  contents: read

concurrency:
  group: pr-title-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  pr-title:
    name: PR title
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
        with:
          persist-credentials: false
      - uses: ./.github/actions/setup-bun
      - name: Validate PR title
        if: github.event_name == 'pull_request'
        env:
          PR_TITLE: ${{ github.event.pull_request.title }}
          COMMITLINT_PR_TITLE: '1'
        run: |
          if ! printf '%s\n' "$PR_TITLE" | bun run check:commits; then
            echo '::error title=PR title::Use a Conventional Commit title, for example fix: preserve selection. See CONTRIBUTING.md#commit-messages.'
            exit 1
          fi