Allow mention command to accept ids/names, resolve #2796

Author: fourjr

cogs/utility.py

@@ -638,7 +638,7 @@ async def ping(self, ctx):
 
     @commands.command()
     @checks.has_permissions(PermissionLevel.ADMINISTRATOR)
-    async def mention(self, ctx, *, mention: str = None):
+    async def mention(self, ctx, *mention: Union[discord.Role, discord.Member]):
         """
         Change what the bot mentions at the start of each thread.
 
@@ -647,11 +647,12 @@ async def mention(self, ctx, *, mention: str = None):
         # TODO: ability to disable mention.
         current = self.bot.config["mention"]
 
-        if mention is None:
+        if not mention:
             embed = discord.Embed(
                 title="Current mention:", color=self.bot.main_color, description=str(current)
             )
         else:
+            mention = " ".join(i.mention for i in mention)
             embed = discord.Embed(
                 title="Changed mention!",
                 description=f'On thread creation the bot now says "{mention}".',