irc: Parse command args

ircbot.py

@@ -1,5 +1,14 @@
+"""
+This module implements an IRC bot that aims to be compatible with the discord.py API in order to
+facilitate re-use of the commands for that bot.
+
+The supported features are the subset of what is needed for this project and not more than that.
+"""
+
 import asyncio
+import inspect
 import os
+import shlex
 import sys
 
 import pydle
@@ -8,6 +17,24 @@ from discord_webhook import DiscordEmbed
 import commands as botcommands
 
 
+def command_args(handler, sig):
+    parse = []
+    for par in list(sig.parameters.values())[1:]:
+        if par.annotation in (str, inspect._empty):
+            parse.append(lambda v: v)
+        elif par.annotation is bool:
+            parse.append(lambda v: bool(v))
+        else:
+            raise Exception(f"unsuported type {par.annotation}")
+
+    async def _proxy(ctx):
+        args = shlex.split(ctx._message)[1:]
+        args = [parse[i](v) for i, v in enumerate(args)]
+        await handler(ctx, *args)
+
+    return _proxy
+
+
 class DiscordAuthor:
     def __init__(self, nick):
         self.nick = nick
@@ -32,7 +59,11 @@ class DiscordContext:
 
         return NilTyping()
 
-    async def reply(self, m):
+    async def reply(self, m, file=None):
+        if file:
+            # TODO: Host the file somewhere so it can be downloaded.
+            m += f" {file.filename}"
+
         lines = m.strip().split("\n")
         lines = [f"{self._source}: {line}" for line in lines]
         await self._bot.message(self._target, "\n".join(lines))
@@ -71,7 +102,8 @@ class DiscordImplBot(pydle.Client):
         if not message.startswith(self._cmd_prefix):
             return
 
-        cmd_fn = self._cmds.get(message.removeprefix(self._cmd_prefix))
+        name = message.removeprefix(self._cmd_prefix).split(" ", 1)[0]
+        cmd_fn = self._cmds.get(name)
         if not cmd_fn:
             return
 
@@ -83,7 +115,13 @@ class DiscordImplBot(pydle.Client):
         def _reg_cmd(handler):
             nonlocal name
             name = name or handler.__name__
+
+            sig = inspect.signature(handler)
+            if len(sig.parameters) == 1:
+                # Just the DiscordContext argument.
                 self._cmds[name] = handler
+            else:
+                self._cmds[name] = command_args(handler, sig)
 
         return _reg_cmd