Add support for new message types related to premium guilds.

3 files changed, 40 insertions, 8 deletions

diff --git a/discord/enums.py b/discord/enums.py
index d077f7ee..5e47f8a9 100644
--- a/discord/enums.py
+++ b/discord/enums.py
@@ -76,14 +76,18 @@ class ChannelType(Enum):
 
 @fast_lookup
 class MessageType(Enum):
-    default             = 0
-    recipient_add       = 1
-    recipient_remove    = 2
-    call                = 3
-    channel_name_change = 4
-    channel_icon_change = 5
-    pins_add            = 6
-    new_member          = 7
+    default                    = 0
+    recipient_add              = 1
+    recipient_remove           = 2
+    call                       = 3
+    channel_name_change        = 4
+    channel_icon_change        = 5
+    pins_add                   = 6
+    new_member                 = 7
+    premium_guild_subscription = 8
+    premium_guild_tier_1       = 9
+    premium_guild_tier_2       = 10
+    premium_guild_tier_3       = 11
 
 @fast_lookup
 class VoiceRegion(Enum):
diff --git a/discord/message.py b/discord/message.py
index 5ed97d59..75ee52b5 100644
--- a/discord/message.py
+++ b/discord/message.py
@@ -603,6 +603,18 @@ class Message:
             else:
                 return '{0.author.name} started a call \N{EM DASH} Join the call.'.format(self)
 
+        if self.type is MessageType.premium_guild_subscription:
+            return '{0.author.name} just boosted the server!'.format(self)
+
+        if self.type is MessageType.premium_guild_tier_1:
+            return '{0.author.name} just boosted the server! {0.guild} has achieved **Level 1!**'.format(self)
+
+        if self.type is MessageType.premium_guild_tier_2:
+            return '{0.author.name} just boosted the server! {0.guild} has achieved **Level 2!**'.format(self)
+
+        if self.type is MessageType.premium_guild_tier_3:
+            return '{0.author.name} just boosted the server! {0.guild} has achieved **Level 3!**'.format(self)
+
     async def delete(self, *, delay=None):
         """|coro|
 
diff --git a/docs/api.rst b/docs/api.rst
index f8d2af31..2464ffee 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -720,6 +720,22 @@ All enumerations are subclasses of `enum`_.
 
         The system message denoting that a new member has joined a Guild.
 
+    .. attribute:: premium_guild_subscription
+
+        The system message denoting that a member has "nitro boosted" a guild.
+    .. attribute:: premium_guild_tier_1
+
+        The system message denoting that a member has "nitro boosted" a guild
+        and it achieved level 1.
+    .. attribute:: premium_guild_tier_2
+
+        The system message denoting that a member has "nitro boosted" a guild
+        and it achieved level 2.
+    .. attribute:: premium_guild_tier_3
+
+        The system message denoting that a member has "nitro boosted" a guild
+        and it achieved level 3.
+
 .. class:: ActivityType
 
     Specifies the type of :class:`Activity`. This is used to check how to