1 files changed, 75 insertions, 0 deletions
diff --git a/bin/mutual_friends.py b/bin/mutual_friends.py
new file mode 100644
index 0000000..8823619
--- /dev/null
+++ b/bin/mutual_friends.py
@@ -0,0 +1,75 @@
+# Copyright 2015 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is licensed under the terms of the MIT License.
+# See LICENSE.txt for details.
+
+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_FIELDS = UserField.UID, UserField.FIRST_NAME, UserField.LAST_NAME, UserField.SCREEN_NAME
+
+def query_friend_list(api, user):
+    return api.friends_get(user.get_uid(), fields=OUTPUT_FIELDS)
+
+def extract_output_fields(user):
+    new_user = OrderedDict()
+    for field in OUTPUT_FIELDS:
+        new_user[str(field)] = user[field] if field in user else None
+    return new_user
+
+def print_mutual_friends_csv(mutual_friends):
+    writer = csv.writer(sys.stdout, lineterminator='\n')
+    for user in mutual_friends:
+        user = extract_output_fields(user)
+        writer.writerow(user.values())
+
+def print_mutual_friends_json(mutual_friends):
+    print(json.dumps([extract_output_fields(user) for user in mutual_friends], indent=3))
+
+def print_mutual_friends(mutual_friends, fmt):
+    if fmt is OutputFormat.CSV:
+        print_mutual_friends_csv(mutual_friends)
+    elif fmt is OutputFormat.JSON:
+        print_mutual_friends_json(mutual_friends)
+    else:
+        raise NotImplementedError('unsupported output format: ' + str(fmt))
+
+class OutputFormat(Enum):
+    CSV = 'csv'
+    JSON = 'json'
+
+    def __str__(self):
+        return self.value
+
+if __name__ == '__main__':
+    import argparse
+
+    def output_format(s):
+        try:
+            return OutputFormat(s)
+        except ValueError:
+            raise argparse.ArgumentError()
+
+    parser = argparse.ArgumentParser(
+        description='Learn who your ex and her new boyfriend are both friends with.')
+
+    parser.add_argument(metavar='UID', dest='uids', nargs='+',
+                        help='user IDs or "screen names"')
+    parser.add_argument('--output-format', type=output_format,
+                        choices=tuple(fmt for fmt in OutputFormat),
+                        default=OutputFormat.CSV,
+                        help='specify output format')
+
+    args = parser.parse_args()
+
+    api = API(Language.EN)
+    users = api.users_get(args.uids)
+
+    friend_lists = map(lambda user: frozenset(query_friend_list(api, user)), users)
+    mutual_friends = frozenset.intersection(*friend_lists)
+    print_mutual_friends(mutual_friends, args.output_format)