A bot that says "bong" on the hour every hour

big_ben.py

"""A bot that says "bong" on the hour every hour"""

from datetime import datetime as dt

import discord
from discord.ext import commands
from discord.ext import tasks

from cogs import utils


class BigBen(utils.Cog):

    def __init__(self, bot:utils.CustomBot):
        super().__init__(bot)
        self.last_posted_hour: int = None
        self.bing_bong.start()

    async def cog_command_error(self, ctx, error):
        """Error responses for cleaner commands"""

        if isinstance(error, commands.MissingPermissions):
            await ctx.send(f"You need the {error.missing_permis[0]} permission to run this command.")
            return
        raise error

    def cog_unload(self):
        self.bing_bong.cancel()

    @tasks.loop(seconds=5)
    async def bing_bong(self):
        """Do the bong"""

        # See if it should post
        now = dt.now()
        if now.hour != self.last_posted_hour and now.minute == 0:
            self.last_posted_hour = now.hour
        else:
            return

        # Post out
        channels_to_delete = []
        for guild_id, channel in self.bot.bong_channels.items():
            try:
                await channel.send("Bong")
            except discord.Forbidden:
                pass
            except AttributeError:
                del self.bot.bong_channels[guild_id]
                channels_to_delete.append(guild_id)

        # Delete errored channels
        async with self.bot.database() as db:
            for i in channels_to_delete:
                await db("DELETE FROM bong_channels WHERE guild_id=$1", i)

    @bing_bong.before_loop
    async def before_bing_bong(self):
        await self.bot.wait_until_ready()

    @commands.command()
    async def setbong(self, ctx:commands.Context, channel:discord.TextChannel=None):
        """Sets the channel for the bingbong"""

        # Filter out DMs
        channel = channel or ctx.channel
        if ctx.guild is None:
            await ctx.send("You can't run this command in DMs.")
            return

        # Filter out non-permissions
        if not channel.permissions_for(ctx.guild.me).send_messages:
            await ctx.send("I don't have permissions to send messages to that channel")
            return

        # Save it
        self.bot.bong_channels[ctx.guild.id] = channel
        async with self.bot.database() as db:
            await db("INSERT INTO bong_channels VALUES ($1, $2)", ctx.guild.id, channel.id)

        # Respond
        await ctx.send("Channel set.")


def setup(bot:utils.CustomBot):
    x = BigBen(bot)
    bot.add_cog(x)