pr-summary.yml

name: PR summary
on:
  pull_request: { types: [opened, synchronize, reopened, ready_for_review] }
permissions: { contents: read, pull-requests: write }
concurrency: { group: pr-summary-${{ github.ref }}, cancel-in-progress: true }
jobs:
  summary:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v4
        with: { fetch-depth: 0 }
      - name: Write step summary
        shell: bash
        run: |
          base="${{ github.base_ref }}"; head="${{ github.sha }}"

          # Ensure local knowledge of the base ref; fetch if missing (tolerate failures)
          if ! git rev-parse --verify "origin/$base" >/dev/null 2>&1; then
            git fetch --no-tags --depth=1 origin "$base" || echo "WARN: could not fetch origin/$base" >&2
          fi

          changed_count=0
          docs_count=0
          file_list=""

          if git rev-parse --verify "origin/$base" >/dev/null 2>&1; then
            base_commit="$(git rev-parse "origin/$base" 2>/dev/null || echo "")"
            if [ -n "$base_commit" ]; then
              # Use diff-tree for robust listing between base and head
              file_list="$(git diff-tree --no-commit-id --name-only -r "$base_commit" "$head" 2>/dev/null || echo "")"
            else
              echo "WARN: empty base commit for origin/$base" >&2
            fi
          else
            echo "WARN: origin/$base not available; counts default to 0" >&2
          fi

          if [ -n "$file_list" ]; then
            changed_count="$(printf "%s\n" "$file_list" | sed '/^$/d' | wc -l | tr -d ' ')"
            docs_count="$(printf "%s\n" "$file_list" | grep -E '^content/.*\.md$' | wc -l | tr -d ' ' || true)"
          fi

          {
            echo "## Pull request summary"
            echo "- Changed files: $changed_count"
            echo "- Docs content markdown files (regex ^content/.*\\.md$): $docs_count"
          } >> "$GITHUB_STEP_SUMMARY"
      - name: Comment on PR (non-forks)
        if: ${{ github.event.pull_request.head.repo.fork == false }}
        env: { GH_TOKEN: ${{ github.token }} }
        run: gh pr comment ${{ github.event.pull_request.number }} --body-file "$GITHUB_STEP_SUMMARY"