neovim/.github/workflows/news.yml

name: "news.txt check"
on:
  pull_request:
    branches:
    - 'master'
jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: news.txt needs to be updated
        run: |
          for commit in $(git rev-list HEAD~${{ github.event.pull_request.commits }}..HEAD); do
            message=$(git log -n1 --pretty=format:%s $commit)
            type="$(echo "$message" | sed -E 's|([[:alpha:]]+)(\(.*\))?!?:.*|\1|')"
            breaking="$(echo "$message" | sed -E 's|[[:alpha:]]+(\(.*\))?!:.*|breaking-change|')"
            if [[ "$type" == "feat" ]] || [[ "$breaking" == "breaking-change" ]]; then
              ! git diff HEAD~${{ github.event.pull_request.commits }}..HEAD --quiet runtime/doc/news.txt ||
              {
                echo "
                  Pull request includes a new feature or a breaking change, but
                  news.txt hasn't been updated yet. news.txt is our primary way of
                  communicating changes to users so it's important to keep it up to
                  date."
                  exit 1
               }
            fi
          done