Vendor discord.py (#2387)

Signed-off-by: Toby Harradine <tobyharradine@gmail.com>

discord/context_managers.py

@@ -0,0 +1,69 @@
+# -*- coding: utf-8 -*-
+
+"""
+The MIT License (MIT)
+
+Copyright (c) 2015-2017 Rapptz
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+"""
+
+import asyncio
+
+
+def _typing_done_callback(fut):
+    # just retrieve any exception and call it a day
+    try:
+        fut.exception()
+    except Exception:
+        pass
+
+
+class Typing:
+    def __init__(self, messageable):
+        self.loop = messageable._state.loop
+        self.messageable = messageable
+
+    async def do_typing(self):
+        try:
+            channel = self._channel
+        except AttributeError:
+            channel = await self.messageable._get_channel()
+
+        typing = channel._state.http.send_typing
+
+        while True:
+            await typing(channel.id)
+            await asyncio.sleep(5)
+
+    def __enter__(self):
+        self.task = asyncio.ensure_future(self.do_typing(), loop=self.loop)
+        self.task.add_done_callback(_typing_done_callback)
+        return self
+
+    def __exit__(self, exc_type, exc, tb):
+        self.task.cancel()
+
+    async def __aenter__(self):
+        self._channel = channel = await self.messageable._get_channel()
+        await channel._state.http.send_typing(channel.id)
+        return self.__enter__()
+
+    async def __aexit__(self, exc_type, exc, tb):
+        self.task.cancel()