new_contents: """
  Misc cog.
  """
  import asyncio
  from itertools import islice
  
  import discord
  import google
  import time
  
  from asyncio_extras import threadpool
  from discord.ext import commands
  
  from joku.bot import Context
  from joku.cogs._common import Cog
  
  
  class Misc(Cog):
      @commands.command()
      async def ping(self, ctx: Context):
          """
          Pong.
          """
          before = time.monotonic()
          msg = await ctx.send(":ping_pong: Ping!")  # type: discord.Message
          after = time.monotonic()
          await msg.edit(content=":ping_pong: Ping! | {}ms".format(round((after - before) * 1000, 2)))
  
      @commands.command()
      async def cleanup(self, ctx: Context):
          """
          Cleans up bot messages in the last 100 messages.
          """
          channel = ctx.channel  # type: discord.TextChannel
          if channel.permissions_for(ctx.guild.me).manage_messages:
              count = len(await channel.purge(limit=100, check=lambda m: m.author == ctx.guild.me, before=ctx.message))
          else:
              count = 0
              async for message in channel.history(limit=100, before=ctx.message):
                  if message.author == ctx.guild.me:
                      await message.delete()
                      count += 1
  
          m = await ctx.send(":heavy_check_mark: Cleaned up `{}` messages.".format(count))
          await asyncio.sleep(5)
          await m.delete()
  
  
  setup = Misc.setup
  
subject: Add misc cog.