compare.py

import argparse
import os
import filecmp
import shutil


def dejoin(path, opath):
    if path.startswith(opath):
        path = path[len(opath):]
        if len(path) >= 1 and path[0] == '\\' or path[0] == '/':
            path = path[1:]
    return path


def compare(src, std, dst, cc):
    for root, _, files in os.walk(src):
        for f in files:
            src_path = os.path.join(root, f)
            path_fragment = dejoin(src_path, src)
            std_path = os.path.join(std, path_fragment)
            dst_path = os.path.join(dst, path_fragment)

            copy = not os.path.exists(std_path)
            if cc and not copy:
                copy = not filecmp.cmp(src_path, std_path)

            if copy:
                print(src_path)
                os.makedirs(os.path.dirname(dst_path), exist_ok=True)
                shutil.copy2(src_path, dst_path)


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('src', help='the source directory, whose child files might be saved')
    parser.add_argument('std', help='the standard directory, which the source compared to')
    parser.add_argument('dst', help='the directory to save files')
    parser.add_argument('-c', '--compare-contents', help='compare file content', action='store_true', default=False)
    args = parser.parse_args()
    compare(args.src, args.std, args.dst, args.compare_contents)