add on_message_handlers to Bot, by extending Bot

Bot is now extended as Hitomi, so that we can add on_message_handlers =
[], which will store functions to call when on_message happens. this is
necessary because i want to have two things react to on_message, but the
discord.py code only supports one coroutine for on_message. so, this is
a hook into it to do what i want

not sure if i'll end up needing this for on_message_edit or
on_message_delete, but i'm skeptical right now

bot/__init__.py

@@ -4,4 +4,14 @@ from django.conf import settings
 
 BOT_DESCRIPTION = "A simple Discord bot."
 
-hitomi = commands.Bot(command_prefix='!', description=BOT_DESCRIPTION, max_messages=settings.DISCORD_BOT_MAX_MESSAGES)
+
+class Hitomi(commands.Bot):
+    """Extend the discord.py Bot, to add more cool stuff."""
+
+    def __init__(self, *args, **kwargs):
+        """Initialize bot, and cool stuff."""
+        super(Hitomi, self).__init__(*args, **kwargs)
+        self.on_message_handlers = []
+
+
+hitomi = Hitomi(command_prefix='!', description=BOT_DESCRIPTION, max_messages=settings.DISCORD_BOT_MAX_MESSAGES)

bot/management/commands/starthitomi.py

@@ -17,6 +17,16 @@ async def on_ready():
     logger.info("Logged in as {0:s} ({1:s})".format(hitomi.user.name, hitomi.user.id))
 
 
+@hitomi.event
+async def on_message(message):
+    """Call all registered on_message handlers."""
+    for handler in hitomi.on_message_handlers:
+        handler(message)
+
+    # let other stuff happen
+    await hitomi.process_commands(message)
+
+
 async def run_bot():
     """Initialize and begin the bot in an asyncio context."""
     await hitomi.login(settings.DISCORD_BOT_TOKEN)

logger/__init__.py

@@ -9,8 +9,7 @@ from bot import hitomi
 logger = logging.getLogger(__name__)
 
 
-@hitomi.event
-async def on_message(message):
+def on_message(message):
     """Log the seen message."""
     try:
         log_file = log_file_for_message(message)
@@ -23,8 +22,8 @@ async def on_message(message):
         logger.error("error in creating log line")
         logger.exception(ex)
 
-    # let other stuff happen
-    await hitomi.process_commands(message)
+
+hitomi.on_message_handlers.append(on_message)
 
 
 @hitomi.event