Improve some vc stuff and implement quote tts

lib/utils.py

@@ -1,6 +1,11 @@
+import asyncio
+import os
+import random
+import string
 from collections import AsyncIterable
-from typing import Callable, AsyncGenerator, Optional
+from typing import Callable, AsyncGenerator, Optional, Any, Coroutine
 import discord
+import gtts
 
 
 async def async_filter(fun: Callable, iterable: AsyncIterable) -> AsyncGenerator:
@@ -29,3 +34,38 @@ def link_channel(channel: discord.abc.GuildChannel, italic: bool = False) -> str
         return '[*' + channel.name + '*](https://discord.com/channels/' + str(channel.guild.id) + '/' + str(
             channel.id) + ')'
     return '[' + channel.name + '](https://discord.com/channels/' + str(channel.guild.id) + '/' + str(channel.id) + ')'
+
+
+def text_to_speech(text: str, lang: str = "de") -> (discord.AudioSource, Callable[[], None]):
+    tts = gtts.gTTS(text, lang=lang)
+    os.makedirs('temp', exist_ok=True)
+    file_name = 'temp/' + ''.join(random.choice(string.ascii_lowercase) for i in range(12)) + '.mp3'
+    tts.save(file_name)
+    source = discord.PCMVolumeTransformer(
+        discord.FFmpegPCMAudio(source=file_name, before_options='-v quiet')
+    )
+
+    def destroy():
+        os.remove(file_name)
+
+    return source, destroy
+
+
+async def connect_and_play(
+        channel: discord.VoiceChannel, source: discord.AudioSource,
+        after_play: Optional[Callable[[discord.DiscordException, discord.VoiceProtocol], Coroutine[Any, Any, Any]]] = None
+) -> Optional[discord.VoiceProtocol]:
+    # noinspection PyTypeChecker
+    client: discord.VoiceClient = await channel.connect()
+    after_callback: Optional[Callable[[discord.DiscordException], Any]]
+    if after_play is None:
+        after_callback = None
+    else:
+        def callback(exc: discord.DiscordException) -> Any:
+            loop = asyncio.get_event_loop()
+            return loop.run_until_complete(after_play(exc, client))
+
+        after_callback = callback
+
+    client.play(source, after=after_callback)
+    return client