[shizmob#166] First Pass Implementation

A basic lifting of the HalpyBOT List Handler (from @rik079) to Pydle

pydle/features/rfc1459/client.py

@@ -7,12 +7,34 @@
 
 from pydle.client import BasicClient, NotInChannel, AlreadyInChannel
 from . import parsing, protocol
+from typing import List, Optional
+import asyncio
 
 
 class RFC1459Support(BasicClient):
     """ Basic RFC1459 client. """
     DEFAULT_QUIT_MESSAGE = 'Quitting'
 
+    def __init__(
+        self,
+        nickname: str = "HalpyLISTener",
+        fallback: Optional[List] = None,
+        username=None,
+        realname=None,
+        eventloop=None,
+        **kwargs,
+    ):
+        super().__init__(
+            nickname,
+            fallback if fallback is not None else [],
+            username,
+            realname,
+            eventloop,
+            **kwargs,
+        )
+        self._pending_query = asyncio.Queue()
+        self._channellist = set()
+
     ## Internals.
 
     def _reset_attributes(self):
@@ -869,6 +891,31 @@ async def on_raw_319(self, message):
         if nickname in self._pending['whois']:
             self._whois_info[nickname].update(info)
 
+    async def all_channels(self) -> List[str]:
+        await self.rawmsg("LIST")
+        # Create future
+        future = asyncio.get_event_loop().create_future()
+        await self._pending_query.put(future)
+        try:
+            channels = await future
+            return list(channels)
+        except asyncio.CancelledError:
+            # We don't care if it's cancelled as this should only happen on shutdown
+            pass
+
+    async def on_raw_321(self, *args):
+        # Results incoming, empty channel list
+        self._channellist.clear()
+
+    async def on_raw_322(self, message):
+        # Called by Pydle when we get a new channel, add to list
+        self._channellist.add(message.params[1])
+
+    async def on_raw_323(self, *args):
+        # Set results
+        future = await self._pending_query.get()
+        future.set_result(self._channellist)
+
     async def on_raw_324(self, message):
         """ Channel mode. """
         target, channel = message.params[:2]