renames files in given directory using a list of names

## sweepy.py
#!/usr/bin/env python3
# coding=utf-8

import difflib
import argparse
import io
import glob
import os
import itertools
import logging
import functools

VIDEO_EXTENSIONS = ('mpg', 'mpeg', 'mkv', 'avi')
FNAME_REPLACED_CHARS = (('_', ' '), ('-', ' '))
MIN_SIMILARITY_SCORE = .7

logging.basicConfig(level=logging.INFO)


def string_similarity(s1, s2):
    return difflib.SequenceMatcher(None, s1, s2).ratio()


def vid_files_in_dir(path, exts=None):
    exts = exts or VIDEO_EXTENSIONS
    files = itertools.chain.from_iterable(glob.glob('%s/*.%s' % (path, one)) for one in exts)

    return map(os.path.basename, files)


def replace_multi(s, pairs):
    return functools.reduce(lambda x, kv: x.replace(*kv), pairs, s)

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('path', help='path to look for files')
    parser.add_argument('names', help='path to file with new file names')
    args = parser.parse_args()

    path = os.path.abspath(args.path)
    files = vid_files_in_dir(args.path)
    new_names = io.open(args.names, encoding='utf8').read().splitlines()
    #@TODO strip prefixes? (SxxEyy, ...)?

    for f in files:
        fname, ext = os.path.splitext(f)
        fname = replace_multi(fname, FNAME_REPLACED_CHARS)  # @TODO strip group, resolution and similar stuff?
        scored = {name: string_similarity(fname, name) for name in new_names}
        ok_scored = {k: v for k, v in scored.items() if v >= MIN_SIMILARITY_SCORE}
        best = max(ok_scored.keys(), key=(lambda key: ok_scored[key])) if ok_scored else None
        if not best:
            logging.info('[-] No similar name found for "%s". Skipping.' % f)
            continue

        new_name = best+ext
        q = '[*] Rename %s -> %s [y,n] ' % (f, new_name)
        rename = input(q).lower().strip()[0] == 'y'

        if rename:
            old_namep, new_namep = os.path.join(path, f), os.path.join(path, new_name)
            os.rename(old_namep, new_namep)