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# Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "VK scripts" project.
# For details, see https://github.com/egor-tensin/vk-scripts.
# Distributed under the MIT License.
import argparse
from collections import OrderedDict
import csv
from enum import Enum
import json
import sys
from vk.api import API, Language
from vk.user import UserField
_OUTPUT_USER_FIELDS = UserField.UID, UserField.FIRST_NAME, UserField.LAST_NAME
def _query_friend_list(api, user):
return api.friends_get(user.get_uid(), fields=_OUTPUT_USER_FIELDS)
def _filter_user_fields(user):
new_user = OrderedDict()
for field in _OUTPUT_USER_FIELDS:
new_user[str(field)] = user[field] if field in user else None
return new_user
class OutputWriterCSV:
def __init__(self, fd=sys.stdout):
self._writer = csv.writer(fd, lineterminator='\n')
def __enter__(self):
return self
def __exit__(self, *args):
pass
def write_mutual_friends(self, friend_list):
for user in friend_list:
user = _filter_user_fields(user)
self._writer.writerow(user.values())
class OutputWriterJSON:
def __init__(self, fd=sys.stdout):
self._fd = fd
self._arr = []
def __enter__(self):
return self
def __exit__(self, *args):
self._fd.write(json.dumps(self._arr, indent=3, ensure_ascii=False))
self._fd.write('\n')
def write_mutual_friends(self, friend_list):
for user in friend_list:
self._arr.append(_filter_user_fields(user))
class OutputFormat(Enum):
CSV = 'csv'
JSON = 'json'
def __str__(self):
return self.value
def create_writer(self, fd=sys.stdout):
if self is OutputFormat.CSV:
return OutputWriterCSV(fd)
elif self is OutputFormat.JSON:
return OutputWriterJSON(fd)
else:
raise NotImplementedError('unsupported output format: ' + str(self))
def _parse_output_format(s):
try:
return OutputFormat(s)
except ValueError:
raise argparse.ArgumentTypeError('invalid output format: ' + s)
def _parse_args(args=None):
if args is None:
args = sys.argv[1:]
parser = argparse.ArgumentParser(
description='Learn who your ex and her new boyfriend are both friends with.')
parser.add_argument('uids', metavar='UID', nargs='+',
help='user IDs or "screen names"')
parser.add_argument('-f', '--format', dest='fmt',
type=_parse_output_format,
default=OutputFormat.CSV,
choices=OutputFormat,
help='specify output format')
parser.add_argument('-o', '--output', metavar='PATH', dest='fd',
type=argparse.FileType('w', encoding='utf-8'),
default=sys.stdout,
help='set output file path (standard output by default)')
return parser.parse_args(args)
def write_mutual_friends(uids, fmt=OutputFormat.CSV, fd=sys.stdout):
api = API(Language.EN)
users = api.users_get(uids)
friend_lists = (frozenset(_query_friend_list(api, user)) for user in users)
mutual_friends = frozenset.intersection(*friend_lists)
with fmt.create_writer(fd) as writer:
writer.write_mutual_friends(mutual_friends)
def main(args=None):
write_mutual_friends(**vars(_parse_args(args)))
if __name__ == '__main__':
main()
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