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# -*- coding: utf-8 -*-
"""
The MIT License (MIT)
Copyright (c) 2015-2016 Rapptz
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""
import asyncio
import discord
import inspect
from .core import GroupMixin
from .view import StringView
from .context import Context
from .errors import CommandNotFound
class Bot(GroupMixin, discord.Client):
"""Represents a discord bot.
This class is a subclass of :class:`discord.Client` and as a result
anything that you can do with a :class:`discord.Client` you can do with
this bot.
This class also subclasses :class:`GroupMixin` to provide the functionality
to manage commands.
Attributes
-----------
command_prefix
The command prefix is what the message content must contain initially
to have a command invoked. This prefix could either be a string to
indicate what the prefix should be, or a callable that takes in a
:class:`discord.Message` as its first parameter and returns the prefix.
This is to facilitate "dynamic" command prefixes.
The command prefix could also be a list or a tuple indicating that
multiple checks for the prefix should be used and the first one to
match will be the invocation prefix. You can get this prefix via
:attr:`Context.prefix`.
"""
def __init__(self, command_prefix, **options):
super().__init__(**options)
self.command_prefix = command_prefix
def _get_variable(self, name):
stack = inspect.stack()
for frames in stack:
current_locals = frames[0].f_locals
if name in current_locals:
return current_locals[name]
def _get_prefix(self, message):
prefix = self.command_prefix
if callable(prefix):
return prefix(message)
else:
return prefix
@asyncio.coroutine
def say(self, content):
"""|coro|
A helper function that is equivalent to doing
.. code-block:: python
self.send_message(message.channel, content)
Parameters
----------
content : str
The content to pass to :class:`Client.send_message`
"""
destination = self._get_variable('_internal_channel')
result = yield from self.send_message(destination, content)
return result
@asyncio.coroutine
def whisper(self, content):
"""|coro|
A helper function that is equivalent to doing
.. code-block:: python
self.send_message(message.author, content)
Parameters
----------
content : str
The content to pass to :class:`Client.send_message`
"""
destination = self._get_variable('_internal_author')
result = yield from self.send_message(destination, content)
return result
@asyncio.coroutine
def reply(self, content):
"""|coro|
A helper function that is equivalent to doing
.. code-block:: python
msg = '{0.mention}, {1}'.format(message.author, content)
self.send_message(message.channel, msg)
Parameters
----------
content : str
The content to pass to :class:`Client.send_message`
"""
author = self._get_variable('_internal_author')
destination = self._get_variable('_internal_channel')
fmt = '{0.mention}, {1}'.format(author, str(content))
result = yield from self.send_message(destination, fmt)
return result
@asyncio.coroutine
def upload(self, fp, name=None):
"""|coro|
A helper function that is equivalent to doing
.. code-block:: python
self.send_file(message.channel, fp, name)
Parameters
----------
fp
The first parameter to pass to :meth:`Client.send_file`
name
The second parameter to pass to :meth:`Client.send_file`
"""
destination = self._get_variable('_internal_channel')
result = yield from self.send_file(destination, fp, name)
return result
@asyncio.coroutine
def type(self):
"""|coro|
A helper function that is equivalent to doing
.. code-block:: python
self.send_typing(message.channel)
See Also
---------
The :meth:`Client.send_typing` function.
"""
destination = self._get_variable('_internal_channel')
yield from self.send_typing(destination)
@asyncio.coroutine
def process_commands(self, message):
"""|coro|
This function processes the commands that have been registered
to the bot and other groups. Without this coroutine, none of the
commands will be triggered.
By default, this coroutine is called inside the :func:`on_message`
event. If you choose to override the :func:`on_message` event, then
you should invoke this coroutine as well.
Warning
--------
This function is necessary for :meth:`say`, :meth:`whisper`,
:meth:`type`, :meth:`reply`, and :meth:`upload` to work due to the
way they are written.
Parameters
-----------
message : discord.Message
The message to process commands for.
"""
_internal_channel = message.channel
_internal_author = message.author
view = StringView(message.content)
if message.author == self.user:
return
prefix = self._get_prefix(message)
invoked_prefix = prefix
if not isinstance(prefix, (tuple, list)):
if not view.skip_string(prefix):
return
else:
invoked_prefix = discord.utils.find(view.skip_string, prefix)
if invoked_prefix is None:
return
invoker = view.get_word()
tmp = {
'bot': self,
'invoked_with': invoker,
'message': message,
'view': view,
'prefix': invoked_prefix
}
ctx = Context(**tmp)
del tmp
if invoker in self.commands:
command = self.commands[invoker]
ctx.command = command
yield from command.invoke(ctx)
else:
exc = CommandNotFound('Command "{}" is not found'.format(invoker))
self.dispatch('command_error', exc, ctx)
@asyncio.coroutine
def on_message(self, message):
yield from self.process_commands(message)
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