Add support for server specific nicknames.

discord/member.py

@@ -64,11 +64,13 @@ class Member(User):
         The game that the user is currently playing. Could be None if no game is being played.
     server : :class:`Server`
         The server that the member belongs to.
+    nick : Optional[str]
+        The server specific nickname of the user.
     """
 
     __slots__ = [ 'deaf', 'mute', 'self_mute', 'self_deaf', 'is_afk',
                   'voice_channel', 'roles', 'joined_at', 'status', 'game',
-                  'server' ]
+                  'server', 'nick' ]
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs.get('user'))
@@ -80,6 +82,7 @@ class Member(User):
         game = kwargs.get('game', {})
         self.game = Game(**game) if game else None
         self.server = kwargs.get('server', None)
+        self.nick = kwargs.get('nick', None)
         self._update_voice_state(mute=self.mute, deaf=self.deaf)
 
     def _update_voice_state(self, **kwargs):

discord/state.py

@@ -317,9 +317,14 @@ class ConnectionState:
             member.discriminator = user['discriminator']
             member.avatar = user['avatar']
             member.bot = user.get('bot', False)
-            member.roles = [server.default_role]
+
+            # the nickname change is optional,
+            # if it isn't in the payload then it didn't change
+            if 'nick' in data:
+                member.nick = data['nick']
 
             # update the roles
+            member.roles = [server.default_role]
             for role in server.roles:
                 if role.id in data['roles']:
                     member.roles.append(role)

discord/user.py

@@ -125,3 +125,14 @@ class User:
         This is when the user's discord account was created."""
         return snowflake_time(self.id)
 
+    @property
+    def display_name(self):
+        """Returns the user's display name.
+
+        For regular users this is just their username, but
+        if they have a server specific nickname then that
+        is returned instead.
+        """
+        nickname = getattr(self, 'nick', None)
+        return nickname if nickname is not None else self.name
+