Limit to one file *added*

      fi

      # Check that only one file was checked in

      FILE_COUNT=$(git diff --name-only HEAD~1 | wc -l)

      if [ "$FILE_COUNT" -ne 1 ]; then

      FILES_ADDED=$(git diff --name-only --diff-filter=A HEAD~1 | wc -l)

      if [ "FILES_ADDED" -ne 1 ]; then

        echo "Error: Only one file should be committed.";

        exit 1;

      fi