structure-guard.yml

name: Enforce Repository Structure

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

jobs:
  structure-check:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check modified paths
        run: |
          echo "Checking modified files..."

          git fetch origin main
          CHANGED_FILES=$(git diff --name-only origin/main...HEAD)

          echo "Changed files:"
          echo "$CHANGED_FILES"

          INVALID_PATHS=$(echo "$CHANGED_FILES" | grep -Ev \
            '^(level-[0-9]+-|challenges/|resources/|roadmap/|\.github/|README.md|CONTRIBUTING.md|CODE_OF_CONDUCT.md|LICENSE)')

          if [ -n "$INVALID_PATHS" ]; then
            echo "❌ Invalid paths detected:"
            echo "$INVALID_PATHS"
            echo ""
            echo "Contributions must follow the level-based structure."
            exit 1
          fi

          echo "✅ Structure check passed."