Script to add md5 hash to filename

add_md5_digest_to_filename.py

"""
Given filenames, MD5 hashes them and puts the hash in the filename
""" 

import glob
import hashlib
import os
import random
import sys

def hash_file(filename):
    hasher = hashlib.md5()
    with open(filename) as afile:
        buf = afile.read()
        hasher.update(buf)
    return hasher.hexdigest()

def hash_pattern(filenames):
    for filename in filenames:
        file_hash = hash_file(filename)
        (root, ext) = os.path.splitext(filename)
        if file_hash in root:
            continue

        new_filename = root + file_hash + ext
        os.rename(filename, new_filename)
        print(root, file_hash, new_filename)
     
if __name__ == "__main__": 
    argv = sys.argv
    if len(argv) == 1:
        print("Must specify a file or a glob pattern")
        sys.exit(1)

    filenames = argv[1:]
    hash_pattern(filenames)