From ee22753e9e82879363a3c9540166f51d4aa29988 Mon Sep 17 00:00:00 2001
From: NatrixAeria <upezu@student.kit.edu>
Date: Mon, 28 Sep 2020 00:48:17 +0200
Subject: Add a command interface

---
 bot.py           | 48 +++++++++++++++++++++----------------
 command_utils.py | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 config.py        |  9 +++++++
 3 files changed, 110 insertions(+), 20 deletions(-)
 create mode 100644 command_utils.py
 create mode 100644 config.py

diff --git a/bot.py b/bot.py
index 7a794c6..d860397 100644
--- a/bot.py
+++ b/bot.py
@@ -1,20 +1,28 @@
-import discord
-from discord.ext import commands
-
-BOT_NAME = "Cupido"
-
-client = discord.Client()
-bot = commands.Bot(command_prefix='!<3')
-
-
-@client.event
-async def on_ready():
-    print('{0} is logged in as {1.user}'.format(BOT_NAME, client))
-
-
-@bot.command()
-async def init(ctx):
-    pass
-
-
-client.run('token')
+import config
+from command_utils import Command, CommandClient
+
+
+class Client(CommandClient):
+    async def on_ready(self):
+        print(f'the bot {config.NAME} is logged in as "{self.user}"')
+
+    @Command.help_command
+    @Command.names('help', 'hepl', 'h', '?')
+    @Command.description('display this help message')
+    async def help(self, ctx):
+        await ctx.answer(config.HELP_TEXT)
+
+    @Command.names('init', 'create', 'inti', 'craete', 'cretae', 'c', 'i', '+')
+    @Command.description('create a new lobby')
+    async def init(self, ctx):
+        await ctx.answer(f'NIY')
+
+
+if __name__ == '__main__':
+    from os import getenv
+    token = getenv(config.TOKEN_ENV_VAR)
+    if token is None:
+        print('error: no token was given')
+        exit(1)
+    bot = Client()
+    bot.run(token)
diff --git a/command_utils.py b/command_utils.py
new file mode 100644
index 0000000..2dc84c8
--- /dev/null
+++ b/command_utils.py
@@ -0,0 +1,73 @@
+import discord
+
+import config
+
+
+def istrue(value, key):
+    return hasattr(value, key) and getattr(value, key)
+
+
+class Context:
+    def __init__(self, msg, args):
+        self.msg = msg
+        self.args = args
+
+    async def answer(self, value):
+        await self.msg.channel.send(f'{self.msg.author.mention} {value}')
+
+
+class CommandClientMeta(type):
+    def __new__(cls, name, bases, dct):
+        commands = []
+        for item in dct.copy().values():
+            if callable(item) and istrue(item, 'command'):
+                if istrue(item, 'help_command'):
+                    dct['help_command'] = item
+                commands.append(item)
+        dct['commands'] = commands
+        return super().__new__(cls, name, bases, dct)
+
+
+class CommandClient(discord.Client, metaclass=CommandClientMeta):
+    def get_commands(self):
+        return type(self).commands.copy()
+
+    async def run_help(self, ctx):
+        return await type(self).help_command(self, ctx)
+
+    async def on_message(self, msg):
+        text = msg.content.strip()
+        if not text.startswith(config.COMMAND_PREFIX):
+            return
+        try:
+            cmd, *args = [v for v in text[len(config.COMMAND_PREFIX):].split(' ') if v]
+        except ValueError:
+            return await self.run_help(Context(msg, []))
+        ctx = Context(msg, args)
+        for command in self.get_commands():
+            if cmd in command.names:
+                return await command(self, ctx)
+        return await self.run_help(ctx)
+
+
+class Command:
+    @classmethod
+    def names(cls, *names):
+        def meta(f):
+            f.command = True
+            f.names = names
+            return f
+        return meta
+
+    @classmethod
+    def description(cls, *names):
+        def meta(f):
+            f.command = True
+            f.names = names
+            return f
+        return meta
+
+    @classmethod
+    def help_command(cls, f):
+        f.help_command = True
+        return f
diff --git a/config.py b/config.py
new file mode 100644
index 0000000..85d009d
--- /dev/null
+++ b/config.py
@@ -0,0 +1,9 @@
+NAME = 'cupido'
+TOKEN_ENV_VAR = 'DISCORD_TOKEN'
+
+COMMAND_PREFIX = '!<3'
+
+HELP_TEXT = f'''{NAME.title()} - your partner for getting shuffled.
+{NAME.title()} is a discord bot to get to know your people.
+This software is open-source <https://git.kobert.dev/lovefinderrz.git/>!"
+'''
-- 
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