343 lines
12 KiB
Python
343 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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"""
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The MIT License (MIT)
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Copyright (c) 2015-2017 Rapptz
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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"""
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import itertools
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import inspect
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import asyncio
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from .core import GroupMixin, Command
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from .errors import CommandError
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# from discord.iterators import _FilteredAsyncIterator
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# help -> shows info of bot on top/bottom and lists subcommands
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# help command -> shows detailed info of command
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# help command <subcommand chain> -> same as above
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# <description>
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# <command signature with aliases>
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# <long doc>
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# Cog:
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# <command> <shortdoc>
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# <command> <shortdoc>
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# Other Cog:
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# <command> <shortdoc>
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# No Category:
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# <command> <shortdoc>
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# Type <prefix>help command for more info on a command.
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# You can also type <prefix>help category for more info on a category.
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class Paginator:
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"""A class that aids in paginating code blocks for Discord messages.
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Attributes
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-----------
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prefix: :class:`str`
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The prefix inserted to every page. e.g. three backticks.
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suffix: :class:`str`
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The suffix appended at the end of every page. e.g. three backticks.
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max_size: :class:`int`
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The maximum amount of codepoints allowed in a page.
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"""
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def __init__(self, prefix='```', suffix='```', max_size=2000):
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self.prefix = prefix
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self.suffix = suffix
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self.max_size = max_size - len(suffix)
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self._current_page = [prefix]
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self._count = len(prefix) + 1 # prefix + newline
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self._pages = []
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def add_line(self, line='', *, empty=False):
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"""Adds a line to the current page.
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If the line exceeds the :attr:`max_size` then an exception
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is raised.
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Parameters
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-----------
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line: str
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The line to add.
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empty: bool
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Indicates if another empty line should be added.
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Raises
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------
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RuntimeError
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The line was too big for the current :attr:`max_size`.
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"""
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if len(line) > self.max_size - len(self.prefix) - 2:
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raise RuntimeError('Line exceeds maximum page size %s' % (self.max_size - len(self.prefix) - 2))
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if self._count + len(line) + 1 > self.max_size:
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self.close_page()
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self._count += len(line) + 1
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self._current_page.append(line)
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if empty:
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self._current_page.append('')
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self._count += 1
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def close_page(self):
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"""Prematurely terminate a page."""
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self._current_page.append(self.suffix)
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self._pages.append('\n'.join(self._current_page))
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self._current_page = [self.prefix]
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self._count = len(self.prefix) + 1 # prefix + newline
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@property
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def pages(self):
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"""Returns the rendered list of pages."""
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# we have more than just the prefix in our current page
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if len(self._current_page) > 1:
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self.close_page()
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return self._pages
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def __repr__(self):
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fmt = '<Paginator prefix: {0.prefix} suffix: {0.suffix} max_size: {0.max_size} count: {0._count}>'
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return fmt.format(self)
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class HelpFormatter:
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"""The default base implementation that handles formatting of the help
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command.
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To override the behaviour of the formatter, :meth:`~.HelpFormatter.format`
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should be overridden. A number of utility functions are provided for use
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inside that method.
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Attributes
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-----------
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show_hidden: :class:`bool`
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Dictates if hidden commands should be shown in the output.
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Defaults to ``False``.
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show_check_failure: :class:`bool`
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Dictates if commands that have their :attr:`.Command.checks` failed
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shown. Defaults to ``False``.
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width: :class:`int`
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The maximum number of characters that fit in a line.
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Defaults to 80.
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"""
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def __init__(self, show_hidden=False, show_check_failure=False, width=80):
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self.width = width
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self.show_hidden = show_hidden
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self.show_check_failure = show_check_failure
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def has_subcommands(self):
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""":class:`bool`: Specifies if the command has subcommands."""
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return isinstance(self.command, GroupMixin)
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def is_bot(self):
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""":class:`bool`: Specifies if the command being formatted is the bot itself."""
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return self.command is self.context.bot
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def is_cog(self):
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""":class:`bool`: Specifies if the command being formatted is actually a cog."""
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return not self.is_bot() and not isinstance(self.command, Command)
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def shorten(self, text):
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"""Shortens text to fit into the :attr:`width`."""
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if len(text) > self.width:
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return text[:self.width - 3] + '...'
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return text
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@property
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def max_name_size(self):
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""":class:`int`: Returns the largest name length of a command or if it has subcommands
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the largest subcommand name."""
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try:
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commands = self.command.all_commands if not self.is_cog() else self.context.bot.all_commands
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if commands:
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return max(map(lambda c: len(c.name) if self.show_hidden or not c.hidden else 0, commands.values()))
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return 0
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except AttributeError:
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return len(self.command.name)
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@property
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def clean_prefix(self):
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"""The cleaned up invoke prefix. i.e. mentions are ``@name`` instead of ``<@id>``."""
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user = self.context.bot.user
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# this breaks if the prefix mention is not the bot itself but I
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# consider this to be an *incredibly* strange use case. I'd rather go
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# for this common use case rather than waste performance for the
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# odd one.
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return self.context.prefix.replace(user.mention, '@' + user.name)
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def get_command_signature(self):
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"""Retrieves the signature portion of the help page."""
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prefix = self.clean_prefix
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cmd = self.command
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return prefix + cmd.signature
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def get_ending_note(self):
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command_name = self.context.invoked_with
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return "Type {0}{1} command for more info on a command.\n" \
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"You can also type {0}{1} category for more info on a category.".format(self.clean_prefix, command_name)
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async def filter_command_list(self):
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"""Returns a filtered list of commands based on the two attributes
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provided, :attr:`show_check_failure` and :attr:`show_hidden`.
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Also filters based on if :meth:`~.HelpFormatter.is_cog` is valid.
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Returns
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--------
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iterable
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An iterable with the filter being applied. The resulting value is
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a (key, value) :class:`tuple` of the command name and the command itself.
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"""
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def sane_no_suspension_point_predicate(tup):
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cmd = tup[1]
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if self.is_cog():
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# filter commands that don't exist to this cog.
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if cmd.instance is not self.command:
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return False
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if cmd.hidden and not self.show_hidden:
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return False
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return True
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async def predicate(tup):
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if sane_no_suspension_point_predicate(tup) is False:
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return False
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cmd = tup[1]
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try:
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return (await cmd.can_run(self.context))
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except CommandError:
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return False
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iterator = self.command.all_commands.items() if not self.is_cog() else self.context.bot.all_commands.items()
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if self.show_check_failure:
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return filter(sane_no_suspension_point_predicate, iterator)
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# Gotta run every check and verify it
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ret = []
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for elem in iterator:
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valid = await predicate(elem)
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if valid:
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ret.append(elem)
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return ret
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def _add_subcommands_to_page(self, max_width, commands):
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for name, command in commands:
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if name in command.aliases:
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# skip aliases
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continue
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entry = ' {0:<{width}} {1}'.format(name, command.short_doc, width=max_width)
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shortened = self.shorten(entry)
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self._paginator.add_line(shortened)
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async def format_help_for(self, context, command_or_bot):
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"""Formats the help page and handles the actual heavy lifting of how
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the help command looks like. To change the behaviour, override the
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:meth:`~.HelpFormatter.format` method.
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Parameters
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-----------
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context: :class:`.Context`
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The context of the invoked help command.
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command_or_bot: :class:`.Command` or :class:`.Bot`
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The bot or command that we are getting the help of.
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Returns
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--------
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list
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A paginated output of the help command.
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"""
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self.context = context
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self.command = command_or_bot
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return (await self.format())
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async def format(self):
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"""Handles the actual behaviour involved with formatting.
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To change the behaviour, this method should be overridden.
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Returns
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--------
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list
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A paginated output of the help command.
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"""
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self._paginator = Paginator()
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# we need a padding of ~80 or so
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description = self.command.description if not self.is_cog() else inspect.getdoc(self.command)
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if description:
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# <description> portion
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self._paginator.add_line(description, empty=True)
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if isinstance(self.command, Command):
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# <signature portion>
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signature = self.get_command_signature()
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self._paginator.add_line(signature, empty=True)
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# <long doc> section
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if self.command.help:
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self._paginator.add_line(self.command.help, empty=True)
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# end it here if it's just a regular command
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if not self.has_subcommands():
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self._paginator.close_page()
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return self._paginator.pages
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max_width = self.max_name_size
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def category(tup):
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cog = tup[1].cog_name
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# we insert the zero width space there to give it approximate
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# last place sorting position.
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return cog + ':' if cog is not None else '\u200bNo Category:'
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filtered = await self.filter_command_list()
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if self.is_bot():
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data = sorted(filtered, key=category)
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for category, commands in itertools.groupby(data, key=category):
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# there simply is no prettier way of doing this.
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commands = sorted(commands)
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if len(commands) > 0:
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self._paginator.add_line(category)
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self._add_subcommands_to_page(max_width, commands)
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else:
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filtered = sorted(filtered)
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if filtered:
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self._paginator.add_line('Commands:')
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self._add_subcommands_to_page(max_width, filtered)
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# add the ending note
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self._paginator.add_line()
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ending_note = self.get_ending_note()
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self._paginator.add_line(ending_note)
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return self._paginator.pages
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