name: Changeset Check

on:
  pull_request:
    types: [opened, synchronize, reopened, labeled, unlabeled]

jobs:
  changeset:
    if: ${{ !contains(github.event.pull_request.labels.*.name, 'no changeset') }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
        with:
          fetch-depth: 0

      - name: Require a change file
        env:
          BASE_REF: ${{ github.base_ref }}
        run: |
          if ! git diff --name-only --diff-filter=A "origin/$BASE_REF...HEAD" -- '.changeset/*.md' | grep -q .; then
            echo "::error::Add a change file with \`knope document-change\`, or label the PR 'no changeset' if it isn't user-facing."
            exit 1
          fi