utils/check_copies.py/split_long_line_with_indent
def split_long_line_with_indent(line, max_per_line, indent):
    """Split the `line` so that it doesn't go over `max_per_line` and adds `indent` to new lines."""
    words = line.split(" ")
    lines = []
    current_line = words[0]
    for word in words[1:]:
        if len(f"{current_line} {word}") > max_per_line:
            lines.append(current_line)
            current_line = " " * indent + word
        else:
            current_line = f"{current_line} {word}"
    lines.append(current_line)
    return "\n".join(lines)