Add a getGuild proc and most some things around.

src/cache.nim

@@ -6,24 +6,28 @@ type Cache* = ref object
     channels*: seq[Channel]
     guilds*: seq[Guild]
 
-proc getMessageChannel*(msg: Message, cache: Cache): Channel =
-    for index, channel in cache.channels:
-        if (channel.id == msg.channelID):
-            return channel
-
-    return nil
-
-proc getChannelGuild*(channel: Channel, cache: Cache): Guild =
-    for index, guild in cache.guilds:
-        if (guild.id == channel.guildID):
-            return guild
-
-    return nil
-
 proc getChannel*(cache: Cache, id: snowflake): Channel =
     for index, channel in cache.channels:
         if (channel.id == id):
             return channel
     
-    return newChannel(sendRequest(endpoint("/channels/" & $id), HttpGet, 
+    return newChannel(sendRequest(endpoint("/channels/" & $id), HttpGet, defaultHeaders(), 
-        defaultHeaders(), id, RateLimitBucketType.channel))
+        id, RateLimitBucketType.channel))
+
+proc getMessageChannel*(msg: Message, cache: Cache): Channel =
+    ## Get a message's channel object.
+    ## 
+    ## If for some reason the channel is not in cache, it gets requested via the 
+    ## Discord REST API.
+    return cache.getChannel(msg.channelID)
+
+proc getGuild*(cache: Cache, id: snowflake): Guild =
+    for index, guild in cache.guilds:
+        if (guild.id == id):
+            return guild
+    
+    return newGuild(sendRequest(endpoint("/guild/" & $id), HttpGet, defaultHeaders(), 
+        id, RateLimitBucketType.guild))
+
+proc getChannelGuild*(channel: Channel, cache: Cache): Guild =
+    return cache.getGuild(channel.guildID)