Python 2 去除 SumatraPDF 设置无用路径

from __future__ import unicode_literals

import io
import re
import os
import sys

def parse(file, encoding='UTF-8-SIG'):
    valid = []
    text = io.open(file, encoding=encoding).read()
    nav_whole = re.match(r'(.*?)(FileStates \[.*?^\])(.*?\Z)', text, re.S | re.M)
    chunk_pat = re.compile(r'(?P<prev>\s*\[\s*FilePath = )(?P<path>.*?$)(?P<last>.*?Favorites \[.*?\].*?\]\n)', re.M | re.S)
    for mat in chunk_pat.finditer(nav_whole.group(2)):
        if os.path.exists(mat.group('path')):
            valid.append(mat.group())
    with io.open(file, 'w', encoding=encoding) as outfile:
        outfile.write(nav_whole.group(1))
        outfile.write('FileStates [\n')
        outfile.writelines(valid)
        outfile.write(']')
        outfile.write(nav_whole.group(3))

if __name__ == '__main__':
    if len(sys.argv) == 2:
        parse(sys.argv[1])