Support message editing with rich embeds.

discord/client.py

@@ -1374,13 +1374,16 @@ class Client:
                     ret.append(msg)
 
     @asyncio.coroutine
-    def edit_message(self, message, new_content):
+    def edit_message(self, message, new_content=None, *, embed=None):
         """|coro|
 
         Edits a :class:`Message` with the new message content.
 
         The new_content must be able to be transformed into a string via ``str(new_content)``.
 
+        If the ``new_content`` is not provided, then ``embed`` must be provided, which must
+        be of type :class:`Embed`.
+
         The :class:`Message` object is not directly modified afterwards until the
         corresponding WebSocket event is received.
 
@@ -1403,9 +1406,10 @@ class Client:
         """
 
         channel = message.channel
-        content = str(new_content)
+        content = str(new_content) if new_content else None
+        embed = embed.to_dict() if embed else None
         guild_id = channel.server.id if not getattr(channel, 'is_private', True) else None
-        data = yield from self.http.edit_message(message.id, channel.id, content, guild_id=guild_id)
+        data = yield from self.http.edit_message(message.id, channel.id, content, guild_id=guild_id, embed=embed)
         return self.connection._create_message(channel=channel, **data)
 
     @asyncio.coroutine

discord/http.py

@@ -259,11 +259,16 @@ class HTTPClient:
         bucket = '{}:{}'.format(_func_(), guild_id)
         return self.post(url, json=payload, bucket=bucket)
 
-    def edit_message(self, message_id, channel_id, content, *, guild_id=None):
+    def edit_message(self, message_id, channel_id, content, *, guild_id=None, embed=None):
         url = '{0.CHANNELS}/{1}/messages/{2}'.format(self, channel_id, message_id)
-        payload = {
-            'content': str(content)
-        }
+        payload = {}
+
+        if content:
+            payload['content'] = content
+
+        if embed:
+            payload['embed'] = embed
+
         return self.patch(url, json=payload, bucket='messages:' + str(guild_id))
 
     def add_reaction(self, message_id, channel_id, emoji):