qrm2/exts/base.py

"""
Base extension for qrm
---
Copyright (C) 2019 Abigail Gold, 0x5c

This file is part of discord-qrm2 and is released under the terms of the GNU
General Public License, version 2.
"""

import re
from collections import OrderedDict
import random

import discord
import discord.ext.commands as commands

import info

import data.options as opt
import common as cmn


class QrmHelpCommand(commands.HelpCommand):
    def __init__(self):
        super().__init__(command_attrs={'help': 'Shows help about qrm or a command',
                                        'aliases': ['h']})

    def get_bot_mapping(self):
        bot = self.context.bot
        mapping = {}
        for cmd in bot.commands:
            cat = cmd.__original_kwargs__.get('category', None)
            if cat in mapping:
                mapping[cat].append(cmd)
            else:
                mapping[cat] = [cmd]
        return mapping

    def get_command_signature(self, command):
        parent = command.full_parent_name
        if command.aliases != []:
            aliases = ', '.join(command.aliases)
            fmt = command.name
            if parent:
                fmt = f'{parent} {fmt}'
            alias = fmt
            return f'{opt.prefix}{alias} {command.signature}\n    *Aliases:* {aliases}'
        alias = command.name if not parent else f'{parent} {command.name}'
        return f'{opt.prefix}{alias} {command.signature}'

    async def send_error_message(self, error):
        embed = cmn.embed_factory(self.context)
        embed.title = 'qrm Help Error'
        embed.description = error
        embed.colour = cmn.colours.bad
        await self.context.send(embed=embed)

    async def send_bot_help(self, mapping):
        embed = cmn.embed_factory(self.context)
        embed.title = 'qrm Help'
        embed.description = (f'For command-specific help and usage, use `{opt.prefix}help [command name]`'
                             '. Many commands have shorter aliases.')

        for cat, cmds in mapping.items():
            cmds = list(filter(lambda x: not x.hidden, cmds))
            if cmds == []:
                continue
            names = sorted([cmd.name for cmd in cmds])
            if cat is not None:
                embed.add_field(name=cat.title(), value=', '.join(names), inline=False)
            else:
                embed.add_field(name='Other', value=', '.join(names), inline=False)
        await self.context.send(embed=embed)

    async def send_command_help(self, command):
        embed = cmn.embed_factory(self.context)
        embed.title = self.get_command_signature(command)
        embed.description = command.help
        await self.context.send(embed=embed)

    async def send_group_help(self, group):
        embed = cmn.embed_factory(self.context)
        embed.title = self.get_command_signature(group)
        embed.description = group.help
        for cmd in group.commands:
            embed.add_field(name=self.get_command_signature(cmd), value=cmd.help, inline=False)
        await self.context.send(embed=embed)


class BaseCog(commands.Cog):
    def __init__(self, bot: commands.Bot):
        self.bot = bot
        self.changelog = parse_changelog()

    @commands.command(name="info", aliases=["about"])
    async def _info(self, ctx: commands.Context):
        """Shows info about qrm."""
        embed = cmn.embed_factory(ctx)
        embed.title = "About qrm"
        embed.description = info.description

        embed = embed.add_field(name="Authors", value=", ".join(info.authors))
        embed = embed.add_field(name="License", value=info.license)
        embed = embed.add_field(name="Version", value=f'v{info.release}')
        embed = embed.add_field(name="Contributing", value=info.contributing, inline=False)
        embed.set_thumbnail(url=str(self.bot.user.avatar_url))
        await ctx.send(embed=embed)

    @commands.command(name="ping")
    async def _ping(self, ctx: commands.Context):
        """Show the current latency to the discord endpoint."""
        content = ctx.message.author.mention if random.random() < 0.05 else ''
        embed = cmn.embed_factory(ctx)
        embed.title = "**Pong!**"
        embed.description = f'Current ping is {self.bot.latency*1000:.1f} ms'
        await ctx.send(content=content, embed=embed)

    @commands.command(name="changelog", aliases=["clog"])
    async def _changelog(self, ctx: commands.Context):
        """Show what has changed in the most recent bot version."""
        embed = cmn.embed_factory(ctx)
        embed.title = "qrm Changelog"
        embed.description = ("For a full listing, visit [Github](https://"
                             "github.com/classabbyamp/discord-qrm2/blob/master/CHANGELOG.md).")
        changelog = self.changelog

        vers = 0
        for ver, log in changelog.items():
            if ver.lower() != 'unreleased':
                if 'date' in log:
                    embed.description += f'\n\n**{ver}** ({log["date"]})'
                else:
                    embed.description += f'\n\n**{ver}**'
                embed = await format_changelog(log, embed)
                vers += 1
            if vers >= 1:
                break

        await ctx.send(embed=embed)

    @commands.command(name="echo", aliases=["e"], hidden=True)
    @commands.check(cmn.check_if_owner)
    async def _echo(self, ctx: commands.Context, channel: commands.TextChannelConverter, *, msg: str):
        """Send a message in a channel as qrm. Only works within a server or DM to server,
        not between servers."""
        await channel.send(msg)


def parse_changelog():
    changelog = OrderedDict()
    ver = ''
    heading = ''

    with open('CHANGELOG.md') as changelog_file:
        for line in changelog_file.readlines():
            if line.strip() == '':
                continue
            if re.match(r'##[^#]', line):
                ver_match = re.match(r'\[(.+)\](?: - )?(\d{4}-\d{2}-\d{2})?', line.lstrip('#').strip())
                if ver_match is not None:
                    ver = ver_match.group(1)
                    changelog[ver] = dict()
                    if ver_match.group(2):
                        changelog[ver]['date'] = ver_match.group(2)
            elif re.match(r'###[^#]', line):
                heading = line.lstrip('#').strip()
                changelog[ver][heading] = []
            elif ver != '' and heading != '':
                if line.startswith('-'):
                    changelog[ver][heading].append(line.lstrip('-').strip())
    return changelog


async def format_changelog(log: dict, embed: discord.Embed):
    for header, lines in log.items():
        formatted = ''
        if header != 'date':
            for line in lines:
                formatted += f'- {line}\n'
            embed.add_field(name=f'**{header}**', value=formatted, inline=False)
    return embed


def setup(bot: commands.Bot):
    bot.add_cog(BaseCog(bot))
    bot._original_help_command = bot.help_command
    bot.help_command = QrmHelpCommand()


def teardown(bot: commands.Bot):
    bot.help_command = bot._original_help_command