name: Check for Windows Line Endings

on:
  pull_request:
    branches: ['*'] # Trigger on all pull requests to any branch

jobs:
  check-line-endings:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0 # Fetch all history to compare changes

      - name: Check for Windows line endings (CRLF)
        run: |
          # Get the list of changed files in the PR
          CHANGED_FILES=$(git diff --name-only ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }})

          # Flag to track if CRLF is found
          CRLF_FOUND=false

          # Loop through each changed file
          for FILE in $CHANGED_FILES; do
            # Check if the file exists and is a text file
            if [ -f "$FILE" ] && file "$FILE" | grep -q "text"; then
              # Check for CRLF line endings
              if grep -UP '\r$' "$FILE"; then
                echo "Error: Windows line endings (CRLF) detected in $FILE"
                CRLF_FOUND=true
              fi
            fi
          done

          # Exit with error if CRLF was found
          if [ "$CRLF_FOUND" = true ]; then
            exit 1
          fi