#  Copyright (c) PARRRATE T&V 2021. All rights reserved.

import os
from io import StringIO

__all__ = ('readfile',)


def readfile(path: str) -> str:
    srcio = StringIO()
    with open(path + '.bu4', encoding='utf-8') as file:
        for line in file:
            if line.startswith('@'):
                srcio.write(readfile(os.path.join(path, os.path.pardir, line.removeprefix('@').strip())))
            else:
                srcio.write(line)
    return srcio.getvalue()