remove non-existent files from user's recently-used.xbel (XFCE4)

clean_ru.py

#!/usr/bin/env python3


def parseArgs():
    from sys import stderr
    import argparse
    from os.path import expanduser, isfile
    parser = argparse.ArgumentParser()
    parser.add_argument(
        '-f', '--file', help='file to be cleaned',
        default='~/.local/share/recently-used.xbel'
    )
    args = parser.parse_args()
    ru_file = expanduser(args.file)
    if not isfile(ru_file):
        print('file does not exist or is not readable: {}'.format(ru_file),
              file=stderr)
        exit(1)
    return ru_file


def parseFile(ru_file):
    import xml.etree.ElementTree as ET
    from urllib.request import urlopen
    from urllib.error import URLError
    tree = ET.parse(ru_file)
    bad_bookmarks = []
    n_total = 0
    for bookmark in tree.getroot().findall('bookmark'):
        fullpath = bookmark.get('href')
        n_total += 1
        try:
            urlopen(fullpath)
        except URLError:
            bad_bookmarks.append(bookmark)
    return tree, n_total, bad_bookmarks


def promptCleanup(n_total, bad_bookmarks):
    n_bad = len(bad_bookmarks)
    print('Scanned {} bookmarks; found {} errors'.format(n_total, n_bad))
    if n_bad is 0:
        return False

    print('\n'.join([b.get('href') for b in bad_bookmarks]))
    return input('\nRemove from recently used list? (y/N) ').casefold(
        ).find('y') == 0


def cleanAndSave(bad_bookmarks, ru_file):
    from os import rename, stat, chown, chmod
    root = tree.getroot()
    for bad_bookmark in bad_bookmarks:
        root.remove(bad_bookmark)

    status = stat(ru_file)
    rename(ru_file, ru_file + '.old')
    tree.write(ru_file, encoding='UTF-8', xml_declaration=True)
    chmod(ru_file, status.st_mode)
    chown(ru_file, status.st_uid, status.st_gid)

ru_file = parseArgs()
tree, n_total, bad_bookmarks = parseFile(ru_file)
if not promptCleanup(n_total, bad_bookmarks):
    exit(0)
cleanAndSave(bad_bookmarks, ru_file)