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from __future__ import annotations
import argparse
from typing import Sequence
def main(argv: Sequence[str] | None = None) -> int:
parser = argparse.ArgumentParser()
parser.add_argument('filenames', nargs='*', help='Filenames to check')
args = parser.parse_args(argv)
retv = 0
for filename in args.filenames:
with open(filename, 'rb') as f:
if f.read(3) == b'\xef\xbb\xbf':
retv = 1
print(f'{filename}: Has a byte-order marker')
return retv
if __name__ == '__main__':
raise SystemExit(main())
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