commitlint.yml

name: commitlint
on: [push, pull_request]

jobs:
  commitlint:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
        with:
          fetch-depth: 0

      - name: Use Node.js
        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6
        with:
          cache: yarn
          node-version-file: .nvmrc

      - name: Install dependencies
        run: yarn

      - name: Lint commit message
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            # Only lint first-parent non-merge commits to skip merged upstream history
            commits=$(git rev-list --no-merges --first-parent \
              ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }})
            if [ -n "$commits" ]; then
              for sha in $commits; do
                echo "Linting commit $sha..."
                yarn commitlint --from="$sha~1" --to="$sha"
              done
            else
              echo "No non-merge commits to lint"
            fi
          else
            yarn commitlint --from=HEAD~1
          fi