qrm2/exts/morse.py

"""
Morse Code 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 json

import discord.ext.commands as commands

import common as cmn


class MorseCog(commands.Cog):
    def __init__(self, bot: commands.Bot):
        self.bot = bot
        with open('resources/morse.json') as morse_file:
            self.ascii2morse = json.load(morse_file)
            self.morse2ascii = {v: k for k, v in self.ascii2morse.items()}

    @commands.command(name="morse", aliases=['cw'], category=cmn.cat.ref)
    async def _morse(self, ctx: commands.Context, *, msg: str):
        """Converts ASCII to international morse code."""
        with ctx.typing():
            result = ''
            for char in msg.upper():
                try:
                    result += self.ascii2morse[char]
                except KeyError:
                    result += '<?>'
                result += ' '
            embed = cmn.embed_factory(ctx)
            embed.title = f'Morse Code for {msg}'
            embed.description = result
            embed.colour = cmn.colours.good
        await ctx.send(embed=embed)

    @commands.command(name="unmorse", aliases=['demorse', 'uncw', 'decw'], category=cmn.cat.ref)
    async def _unmorse(self, ctx: commands.Context, *, msg: str):
        '''Converts international morse code to ASCII.'''
        with ctx.typing():
            result = ''
            msg0 = msg
            msg = msg.split('/')
            msg = [m.split() for m in msg]
            for word in msg:
                for char in word:
                    try:
                        result += self.morse2ascii[char]
                    except KeyError:
                        result += '<?>'
                result += ' '
            embed = cmn.embed_factory(ctx)
            embed.title = f'ASCII for {msg0}'
            embed.description = result
            embed.colour = cmn.colours.good
        await ctx.send(embed=embed)

    @commands.command(name="cwweight", aliases=["weight", 'cww'], category=cmn.cat.ref)
    async def _weight(self, ctx: commands.Context, *, msg: str):
        '''Calculates the CW Weight of a callsign or message.'''
        embed = cmn.embed_factory(ctx)
        with ctx.typing():
            msg = msg.upper()
            weight = 0
            for char in msg:
                try:
                    cw_char = self.ascii2morse[char].replace('-', '==')
                    weight += len(cw_char) * 2 + 2
                except KeyError:
                    embed.title = 'Error in calculation of CW weight'
                    embed.description = f'Unknown character {char} in callsign'
                    embed.colour = cmn.colours.bad
                    await ctx.send(embed=embed)
                    return
            embed.title = f'CW Weight of {msg}'
            embed.description = f'The CW weight is **{weight}**'
            embed.colour = cmn.colours.good
        await ctx.send(embed=embed)


def setup(bot: commands.Bot):
    bot.add_cog(MorseCog(bot))