Fix error message in help, fix help not working with mention prefix, fix error when pinning system messages (by adding an easter egg)

cogs/help.py

@@ -22,6 +22,10 @@ class HelpCommand(commands.MinimalHelpCommand):
         if ctx.bot.locked:
             return
 
+        # If mention prefix was used, don't count it as a target
+        if ctx.message.content.startswith("<@"):
+            ctx.message.mentions = ctx.message.mentions[1:]
+
         if len(ctx.message.mentions) > 5:
             return await ctx.send("Je kan Help maar naar maximaal 5 mensen doorsturen.")
 
@@ -40,6 +44,10 @@ class HelpCommand(commands.MinimalHelpCommand):
         spl = command.split(" ")
         spl = spl[:len(spl) - len(self.ctx.message.mentions)]
 
+        # A person was mentioned without passing an argument
+        if not spl:
+            return await self.send_bot_help(self.get_bot_mapping())
+
         # Turn dic to lowercase to allow proper name searching
         all_commands = dict((k.lower(), v) for k, v in bot.all_commands.items())
 
@@ -115,6 +123,10 @@ class HelpCommand(commands.MinimalHelpCommand):
         embed.add_field(name=await self.get_command_signature(command),
                         value=await self.add_aliases_formatting(sorted(command.aliases)) + helpDescription)
         for person in await self.get_destination():
+            # Can't send to bots
+            if person.bot:
+                continue
+
             await person.send(embed=embed)
 
     async def send_group_help(self, group):
@@ -139,6 +151,10 @@ class HelpCommand(commands.MinimalHelpCommand):
                                   helpFile[self.get_name(subcommand).lower()], inline=False)
 
         for person in await self.get_destination():
+            # Can't send to bots
+            if person.bot:
+                continue
+
             await person.send(embed=embed)
 
     # Allow mentioning people to send it to them instead

cogs/school.py

@@ -96,8 +96,11 @@ class School(commands.Cog):
         if ctx.author.id in blacklist:
             return
 
-        await ctx.message.add_reaction("✅")
+        if message.is_system():
+            return await ctx.send("Dus jij wil system messages pinnen?\nMag niet.")
+
         await message.pin(reason="Didier Pin door {}".format(ctx.author.display_name))
+        await ctx.message.add_reaction("✅")
 
 
 def setup(client):