commitlint.yml

name: Commit Lint

on:
  pull_request_target:
    types: [opened, reopened, synchronize]

permissions:
  contents: read

jobs:
  commitlint:
    if: github.event_name == 'pull_request_target'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0
      - name: Fetch PR head
        run: git fetch origin pull/${{ github.event.pull_request.number }}/head:pr_head
      - name: Run commitlint
        run: |
            merge_base_sha=$(git merge-base HEAD pr_head)
            first_commit_sha=$(git rev-list --no-merges --reverse $merge_base_sha..pr_head | head -n 1)

            if [ -z "$first_commit_sha" ]; then
              echo "Could not determine the first commit of the PR. Skipping."
              exit 0
            fi

            commit_message=$(git log -1 --pretty=%B $first_commit_sha)
            # we can't use npx see https://github.com/conventional-changelog/commitlint/issues/613
            echo '{}' > package.json
            npm install --no-fund --no-audit @commitlint/config-conventional @commitlint/cli
            echo "$commit_message" | ./node_modules/.bin/commitlint -g .commitlintrc