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Diffstat (limited to 'bot/help.py')
| -rw-r--r-- | bot/help.py | 549 |
1 files changed, 0 insertions, 549 deletions
diff --git a/bot/help.py b/bot/help.py deleted file mode 100644 index e9e1f574..00000000 --- a/bot/help.py +++ /dev/null @@ -1,549 +0,0 @@ -# Help command from Python bot. All commands that will be added to there in futures should be added to here too. -import asyncio -import itertools -from collections import namedtuple -from contextlib import suppress -from typing import Union - -from discord import Colour, Embed, HTTPException, Message, Reaction, User -from discord.ext import commands -from discord.ext.commands import CheckFailure, Cog as DiscordCog, Command, Context -from fuzzywuzzy import fuzz, process - -from bot import constants -from bot.bot import SeasonalBot -from bot.constants import Emojis -from bot.utils.pagination import ( - FIRST_EMOJI, LAST_EMOJI, - LEFT_EMOJI, LinePaginator, RIGHT_EMOJI, -) - -DELETE_EMOJI = Emojis.trashcan - -REACTIONS = { - FIRST_EMOJI: 'first', - LEFT_EMOJI: 'back', - RIGHT_EMOJI: 'next', - LAST_EMOJI: 'end', - DELETE_EMOJI: 'stop', -} - -Cog = namedtuple('Cog', ['name', 'description', 'commands']) - - -class HelpQueryNotFound(ValueError): - """ - Raised when a HelpSession Query doesn't match a command or cog. - - Contains the custom attribute of ``possible_matches``. - Instances of this object contain a dictionary of any command(s) that were close to matching the - query, where keys are the possible matched command names and values are the likeness match scores. - """ - - def __init__(self, arg: str, possible_matches: dict = None): - super().__init__(arg) - self.possible_matches = possible_matches - - -class HelpSession: - """ - An interactive session for bot and command help output. - - Expected attributes include: - * title: str - The title of the help message. - * query: Union[discord.ext.commands.Bot, discord.ext.commands.Command] - * description: str - The description of the query. - * pages: list[str] - A list of the help content split into manageable pages. - * message: `discord.Message` - The message object that's showing the help contents. - * destination: `discord.abc.Messageable` - Where the help message is to be sent to. - Cogs can be grouped into custom categories. All cogs with the same category will be displayed - under a single category name in the help output. Custom categories are defined inside the cogs - as a class attribute named `category`. A description can also be specified with the attribute - `category_description`. If a description is not found in at least one cog, the default will be - the regular description (class docstring) of the first cog found in the category. - """ - - def __init__( - self, - ctx: Context, - *command, - cleanup: bool = False, - only_can_run: bool = True, - show_hidden: bool = False, - max_lines: int = 15 - ): - """Creates an instance of the HelpSession class.""" - self._ctx = ctx - self._bot = ctx.bot - self.title = "Command Help" - - # set the query details for the session - if command: - query_str = ' '.join(command) - self.query = self._get_query(query_str) - self.description = self.query.description or self.query.help - else: - self.query = ctx.bot - self.description = self.query.description - self.author = ctx.author - self.destination = ctx.channel - - # set the config for the session - self._cleanup = cleanup - self._only_can_run = only_can_run - self._show_hidden = show_hidden - self._max_lines = max_lines - - # init session states - self._pages = None - self._current_page = 0 - self.message = None - self._timeout_task = None - self.reset_timeout() - - def _get_query(self, query: str) -> Union[Command, Cog]: - """Attempts to match the provided query with a valid command or cog.""" - command = self._bot.get_command(query) - if command: - return command - - # Find all cog categories that match. - cog_matches = [] - description = None - for cog in self._bot.cogs.values(): - if hasattr(cog, "category") and cog.category == query: - cog_matches.append(cog) - if hasattr(cog, "category_description"): - description = cog.category_description - - # Try to search by cog name if no categories match. - if not cog_matches: - cog = self._bot.cogs.get(query) - - # Don't consider it a match if the cog has a category. - if cog and not hasattr(cog, "category"): - cog_matches = [cog] - - if cog_matches: - cog = cog_matches[0] - cmds = (cog.get_commands() for cog in cog_matches) # Commands of all cogs - - return Cog( - name=cog.category if hasattr(cog, "category") else cog.qualified_name, - description=description or cog.description, - commands=tuple(itertools.chain.from_iterable(cmds)) # Flatten the list - ) - - self._handle_not_found(query) - - def _handle_not_found(self, query: str) -> None: - """ - Handles when a query does not match a valid command or cog. - - Will pass on possible close matches along with the `HelpQueryNotFound` exception. - """ - # Combine command and cog names - choices = list(self._bot.all_commands) + list(self._bot.cogs) - - result = process.extractBests(query, choices, scorer=fuzz.ratio, score_cutoff=90) - - raise HelpQueryNotFound(f'Query "{query}" not found.', dict(result)) - - async def timeout(self, seconds: int = 30) -> None: - """Waits for a set number of seconds, then stops the help session.""" - await asyncio.sleep(seconds) - await self.stop() - - def reset_timeout(self) -> None: - """Cancels the original timeout task and sets it again from the start.""" - # cancel original if it exists - if self._timeout_task: - if not self._timeout_task.cancelled(): - self._timeout_task.cancel() - - # recreate the timeout task - self._timeout_task = self._bot.loop.create_task(self.timeout()) - - async def on_reaction_add(self, reaction: Reaction, user: User) -> None: - """Event handler for when reactions are added on the help message.""" - # ensure it was the relevant session message - if reaction.message.id != self.message.id: - return - - # ensure it was the session author who reacted - if user.id != self.author.id: - return - - emoji = str(reaction.emoji) - - # check if valid action - if emoji not in REACTIONS: - return - - self.reset_timeout() - - # Run relevant action method - action = getattr(self, f'do_{REACTIONS[emoji]}', None) - if action: - await action() - - # remove the added reaction to prep for re-use - with suppress(HTTPException): - await self.message.remove_reaction(reaction, user) - - async def on_message_delete(self, message: Message) -> None: - """Closes the help session when the help message is deleted.""" - if message.id == self.message.id: - await self.stop() - - async def prepare(self) -> None: - """Sets up the help session pages, events, message and reactions.""" - await self.build_pages() - - self._bot.add_listener(self.on_reaction_add) - self._bot.add_listener(self.on_message_delete) - - await self.update_page() - self.add_reactions() - - def add_reactions(self) -> None: - """Adds the relevant reactions to the help message based on if pagination is required.""" - # if paginating - if len(self._pages) > 1: - for reaction in REACTIONS: - self._bot.loop.create_task(self.message.add_reaction(reaction)) - - # if single-page - else: - self._bot.loop.create_task(self.message.add_reaction(DELETE_EMOJI)) - - def _category_key(self, cmd: Command) -> str: - """ - Returns a cog name of a given command for use as a key for `sorted` and `groupby`. - - A zero width space is used as a prefix for results with no cogs to force them last in ordering. - """ - if cmd.cog: - try: - if cmd.cog.category: - return f'**{cmd.cog.category}**' - except AttributeError: - pass - - return f'**{cmd.cog_name}**' - else: - return "**\u200bNo Category:**" - - def _get_command_params(self, cmd: Command) -> str: - """ - Returns the command usage signature. - - This is a custom implementation of `command.signature` in order to format the command - signature without aliases. - """ - results = [] - for name, param in cmd.clean_params.items(): - - # if argument has a default value - if param.default is not param.empty: - - if isinstance(param.default, str): - show_default = param.default - else: - show_default = param.default is not None - - # if default is not an empty string or None - if show_default: - results.append(f'[{name}={param.default}]') - else: - results.append(f'[{name}]') - - # if variable length argument - elif param.kind == param.VAR_POSITIONAL: - results.append(f'[{name}...]') - - # if required - else: - results.append(f'<{name}>') - - return f"{cmd.name} {' '.join(results)}" - - async def build_pages(self) -> None: - """Builds the list of content pages to be paginated through in the help message, as a list of str.""" - # Use LinePaginator to restrict embed line height - paginator = LinePaginator(prefix='', suffix='', max_lines=self._max_lines) - - prefix = constants.Client.prefix - - # show signature if query is a command - if isinstance(self.query, commands.Command): - signature = self._get_command_params(self.query) - parent = self.query.full_parent_name + ' ' if self.query.parent else '' - paginator.add_line(f'**```{prefix}{parent}{signature}```**') - - aliases = ', '.join(f'`{a}`' for a in self.query.aliases) - if aliases: - paginator.add_line(f'**Can also use:** {aliases}\n') - - if not await self.query.can_run(self._ctx): - paginator.add_line('***You cannot run this command.***\n') - - if isinstance(self.query, Cog): - paginator.add_line(f'**{self.query.name}**') - - if self.description: - paginator.add_line(f'*{self.description}*') - - # list all children commands of the queried object - if isinstance(self.query, (commands.GroupMixin, Cog)): - - # remove hidden commands if session is not wanting hiddens - if not self._show_hidden: - filtered = [c for c in self.query.commands if not c.hidden] - else: - filtered = self.query.commands - - # if after filter there are no commands, finish up - if not filtered: - self._pages = paginator.pages - return - - if isinstance(self.query, Cog): - grouped = (('**Commands:**', self.query.commands),) - - elif isinstance(self.query, commands.Command): - grouped = (('**Subcommands:**', self.query.commands),) - - # don't show prefix for subcommands - prefix = '' - - # otherwise sort and organise all commands into categories - else: - cat_sort = sorted(filtered, key=self._category_key) - grouped = itertools.groupby(cat_sort, key=self._category_key) - - for category, cmds in grouped: - cmds = sorted(cmds, key=lambda c: c.name) - - if len(cmds) == 0: - continue - - cat_cmds = [] - - for command in cmds: - - # skip if hidden and hide if session is set to - if command.hidden and not self._show_hidden: - continue - - # see if the user can run the command - strikeout = '' - - # Patch to make the !help command work outside of #bot-commands again - # This probably needs a proper rewrite, but this will make it work in - # the mean time. - try: - can_run = await command.can_run(self._ctx) - except CheckFailure: - can_run = False - - if not can_run: - # skip if we don't show commands they can't run - if self._only_can_run: - continue - strikeout = '~~' - - signature = self._get_command_params(command) - info = f"{strikeout}**`{prefix}{signature}`**{strikeout}" - - # handle if the command has no docstring - if command.short_doc: - cat_cmds.append(f'{info}\n*{command.short_doc}*') - else: - cat_cmds.append(f'{info}\n*No details provided.*') - - # state var for if the category should be added next - print_cat = 1 - new_page = True - - for details in cat_cmds: - - # keep details together, paginating early if it won't fit - lines_adding = len(details.split('\n')) + print_cat - if paginator._linecount + lines_adding > self._max_lines: - paginator._linecount = 0 - new_page = True - paginator.close_page() - - # new page so print category title again - print_cat = 1 - - if print_cat: - if new_page: - paginator.add_line('') - paginator.add_line(category) - print_cat = 0 - - paginator.add_line(details) - - self._pages = paginator.pages - - def embed_page(self, page_number: int = 0) -> Embed: - """Returns an Embed with the requested page formatted within.""" - embed = Embed() - - if isinstance(self.query, (commands.Command, Cog)) and page_number > 0: - title = f'Command Help | "{self.query.name}"' - else: - title = self.title - - embed.set_author(name=title, icon_url=constants.Icons.questionmark) - embed.description = self._pages[page_number] - - page_count = len(self._pages) - if page_count > 1: - embed.set_footer(text=f'Page {self._current_page+1} / {page_count}') - - return embed - - async def update_page(self, page_number: int = 0) -> None: - """Sends the intial message, or changes the existing one to the given page number.""" - self._current_page = page_number - embed_page = self.embed_page(page_number) - - if not self.message: - self.message = await self.destination.send(embed=embed_page) - else: - await self.message.edit(embed=embed_page) - - @classmethod - async def start(cls, ctx: Context, *command, **options) -> "HelpSession": - """ - Create and begin a help session based on the given command context. - - Available options kwargs: - * cleanup: Optional[bool] - Set to `True` to have the message deleted on session end. Defaults to `False`. - * only_can_run: Optional[bool] - Set to `True` to hide commands the user can't run. Defaults to `False`. - * show_hidden: Optional[bool] - Set to `True` to include hidden commands. Defaults to `False`. - * max_lines: Optional[int] - Sets the max number of lines the paginator will add to a single page. Defaults to 20. - """ - session = cls(ctx, *command, **options) - await session.prepare() - - return session - - async def stop(self) -> None: - """Stops the help session, removes event listeners and attempts to delete the help message.""" - self._bot.remove_listener(self.on_reaction_add) - self._bot.remove_listener(self.on_message_delete) - - # ignore if permission issue, or the message doesn't exist - with suppress(HTTPException, AttributeError): - if self._cleanup: - await self.message.delete() - else: - await self.message.clear_reactions() - - @property - def is_first_page(self) -> bool: - """Check if session is currently showing the first page.""" - return self._current_page == 0 - - @property - def is_last_page(self) -> bool: - """Check if the session is currently showing the last page.""" - return self._current_page == (len(self._pages)-1) - - async def do_first(self) -> None: - """Event that is called when the user requests the first page.""" - if not self.is_first_page: - await self.update_page(0) - - async def do_back(self) -> None: - """Event that is called when the user requests the previous page.""" - if not self.is_first_page: - await self.update_page(self._current_page-1) - - async def do_next(self) -> None: - """Event that is called when the user requests the next page.""" - if not self.is_last_page: - await self.update_page(self._current_page+1) - - async def do_end(self) -> None: - """Event that is called when the user requests the last page.""" - if not self.is_last_page: - await self.update_page(len(self._pages)-1) - - async def do_stop(self) -> None: - """Event that is called when the user requests to stop the help session.""" - await self.message.delete() - - -class Help(DiscordCog): - """Custom Embed Pagination Help feature.""" - - @commands.command('help') - async def new_help(self, ctx: Context, *commands) -> None: - """Shows Command Help.""" - try: - await HelpSession.start(ctx, *commands) - except HelpQueryNotFound as error: - embed = Embed() - embed.colour = Colour.red() - embed.title = str(error) - - if error.possible_matches: - matches = '\n'.join(error.possible_matches.keys()) - embed.description = f'**Did you mean:**\n`{matches}`' - - await ctx.send(embed=embed) - - -def unload(bot: SeasonalBot) -> None: - """ - Reinstates the original help command. - - This is run if the cog raises an exception on load, or if the extension is unloaded. - """ - bot.remove_command('help') - bot.add_command(bot._old_help) - - -def setup(bot: SeasonalBot) -> None: - """ - The setup for the help extension. - - This is called automatically on `bot.load_extension` being run. - Stores the original help command instance on the `bot._old_help` attribute for later - reinstatement, before removing it from the command registry so the new help command can be - loaded successfully. - If an exception is raised during the loading of the cog, `unload` will be called in order to - reinstate the original help command. - """ - bot._old_help = bot.get_command('help') - bot.remove_command('help') - - try: - bot.add_cog(Help()) - except Exception: - unload(bot) - raise - - -def teardown(bot: SeasonalBot) -> None: - """ - The teardown for the help extension. - - This is called automatically on `bot.unload_extension` being run. - Calls `unload` in order to reinstate the original help command. - """ - unload(bot) |