label-sync.yml

name: Label PRs

on:
  pull_request:
    types: [opened, synchronize]

permissions:
  contents: read
  pull-requests: write

jobs:
  label:
    name: Auto-label by path
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7

      - name: Get changed files
        id: changed
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        # The files endpoint lists paths only. `gh pr diff --name-only` fetches the
        # whole diff first and fails with HTTP 406 past 20,000 lines, which a
        # full docs/gallery regeneration exceeds (#300).
        run: |
          FILES=$(gh api --paginate "repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/files" --jq '.[].filename')
          echo "files<<EOF" >> "$GITHUB_OUTPUT"
          echo "$FILES" >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

      - name: Apply labels
        env:
          FILES: ${{ steps.changed.outputs.files }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          LABELS=""

          if echo "$FILES" | grep -q "^skills/"; then
            LABELS="$LABELS skills"
          fi

          if echo "$FILES" | grep -q "^rules/"; then
            LABELS="$LABELS rules"
          fi

          if echo "$FILES" | grep -q "^snippets/"; then
            LABELS="$LABELS snippets"
          fi

          if echo "$FILES" | grep -q "^templates/"; then
            LABELS="$LABELS templates"
          fi

          if echo "$FILES" | grep -q "^examples/"; then
            LABELS="$LABELS examples"
          fi

          if echo "$FILES" | grep -q "^showcase/"; then
            LABELS="$LABELS showcase"
          fi

          if echo "$FILES" | grep -qE "(README\.md|AGENTS\.md|CLAUDE\.md|ROADMAP\.md|CHANGELOG\.md|^docs/)"; then
            LABELS="$LABELS documentation"
          fi

          if echo "$FILES" | grep -q "^\.github/"; then
            LABELS="$LABELS ci"
          fi

          if [ -n "$LABELS" ]; then
            for label in $LABELS; do
              gh label create "$label" --force --color "ededed" 2>/dev/null || true
              gh pr edit ${{ github.event.pull_request.number }} --add-label "$label"
            done
            echo "Applied labels:$LABELS"
          else
            echo "No labels to apply"
          fi