macrovision/scripts/add-g-tag.py

import sys
import re

from pathlib import Path

for path in Path(sys.argv[1]).rglob('*.svg'):
    with open(path, "r") as file:
        data = file.read()
    if "<g>" not in data:
        data = data.replace("</style>", "</style><g>").replace("</svg>", "</g></svg>")
        with open(path, "w") as file:
            file.write(data)