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import argparse
import hashlib
import json
import sys
from pathlib import Path
from typing import Union
def get_file_hash(path: Union[str, Path], bytes_per_chunk: int = 8192) -> str:
"""Hash a file in chunks using md5."""
path_hash = hashlib.md5()
with open(path, "rb") as path_file:
chunk = path_file.read(bytes_per_chunk)
while chunk:
path_hash.update(chunk)
chunk = path_file.read(bytes_per_chunk)
return path_hash.hexdigest()
# -----------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser()
parser.add_argument("file", nargs="+")
parser.add_argument("--dir", help="Parent directory")
args = parser.parse_args()
if args.dir:
args.dir = Path(args.dir)
hashes = {}
for path_str in args.file:
path = Path(path_str)
path_hash = get_file_hash(path)
if args.dir:
path = path.relative_to(args.dir)
hashes[str(path)] = path_hash
json.dump(hashes, sys.stdout)
if __name__ == "__main__":
main()
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