import os
import argparse


DELIM = '='


def replace_in_files(src, dst, replaces):
    for root, dirs, files in os.walk(src):
        for fname in files:
            full_src_path = os.path.join(root, fname)
            relpath = os.path.relpath(full_src_path, src)
            full_dst_path = os.path.join(dst, relpath)

            with open(full_src_path) as f:
                data = f.read()

            for src, dst in replaces.items():
                data = data.replace(src, dst)

            dirname, _ = os.path.split(full_dst_path)
            os.makedirs(dirname)

            with open(full_dst_path, 'w') as f:
                f.write(data)

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--fname', help='fname')
    parser.add_argument('--src_path', help='src_path')
    parser.add_argument('--dst_path', help='src_path')

    args = parser.parse_args()

    replaces = {}
    for line in open(args.fname):
        src, dst = [s.strip() for s in line.split(DELIM)]
        replaces[src] = dst

    replace_in_files(args.src_path, args.dst_path, replaces)


if __name__ == '__main__':
    main()