help.lua
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help.lua
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	--[[
	Copyright 2020 Matthew Hesketh <matthew@matthewhesketh.com>
	This code is licensed under the MIT. See LICENSE for details.
	]]

	local help = {}
	local mattata = require('mattata')

	function help:init(configuration)
	help.commands = mattata.commands(self.info.username):command('help'):command('start').table
	help.help = '/help [plugin] - A help-orientated menu is sent if no arguments are given. If arguments are given, usage information for the given plugin is sent instead. Alias: /start.'
	help.per_page = configuration.limits.help.per_page
	end

	function help.get_initial_keyboard()
	return mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	'Links',
	'help:links'
	):callback_data_button(
	'Admin Help',
	'help:acmds'
	):callback_data_button(
	'Commands',
	'help:cmds'
	)
	):row(
	mattata.row():switch_inline_query_button(
	'Inline Mode',
	'/'
	):callback_data_button(
	'Settings',
	'help:settings'
	):callback_data_button(
	'Channels',
	'help:channels'
	)
	)
	end

	function help.get_plugin_page(arguments_list, page)
	local plugin_count = #arguments_list
	local page_begins_at = tonumber(page) * help.per_page - (help.per_page - 1)
	local page_ends_at = tonumber(page_begins_at) + (help.per_page - 1)
	if tonumber(page_ends_at) > tonumber(plugin_count) then
	page_ends_at = tonumber(plugin_count)
	end
	local page_plugins = {}
	for i = tonumber(page_begins_at), tonumber(page_ends_at) do
	local plugin = arguments_list[i]
	if i < tonumber(page_ends_at) then
	plugin = plugin .. '\n'
	end
	table.insert(page_plugins, plugin)
	end
	return table.concat(page_plugins, '\n')
	end

	function help.get_back_keyboard()
	return mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' Back',
	'help:back'
	)
	)
	end

	function help.on_inline_query(_, inline_query, _, language)
	local offset = inline_query.offset and tonumber(inline_query.offset) or 0
	local output = mattata.get_inline_help(inline_query.query, offset)
	if not next(output) and offset == 0 then
	output = string.format(language['help']['2'], inline_query.query)
	return mattata.send_inline_article(inline_query.id, language['help']['1'], output)
	end
	offset = tostring(offset + 50)
	return mattata.answer_inline_query(inline_query.id, output, 0, false, offset)
	end

	function help:on_callback_query(callback_query, message, _, language)
	if callback_query.data == 'cmds' then
	local arguments_list = mattata.get_help(self, false, message.chat.id)
	local plugin_count = #arguments_list
	local page_count = math.floor(tonumber(plugin_count) / help.per_page)
	if math.floor(tonumber(plugin_count) / help.per_page) ~= tonumber(plugin_count) / help.per_page then
	page_count = page_count + 1
	end
	local output = help.get_plugin_page(arguments_list, 1)
	output = output .. mattata.escape_html(string.format(language['help']['3'], self.info.username))
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	output,
	'html',
	true,
	mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['4'],
	'help:results:0'
	):callback_data_button(
	'1/' .. page_count,
	'help:pages:1:' .. page_count
	):callback_data_button(
	language['help']['5'] .. ' ' .. mattata.symbols.next,
	'help:results:2'
	)
	):row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['6'],
	'help:back'
	):switch_inline_query_current_chat_button(
	'🔎 ' .. language['help']['7'],
	'/'
	)
	)
	)
	elseif callback_query.data:match('^results:%d*$') then
	local new_page = callback_query.data:match('^results:(%d*)$')
	local arguments_list = mattata.get_help(self, false, message.chat.id)
	local plugin_count = #arguments_list
	local page_count = math.floor(tonumber(plugin_count) / help.per_page)
	if math.floor(tonumber(plugin_count) / help.per_page) ~= tonumber(plugin_count) / help.per_page then
	page_count = page_count + 1
	end
	if tonumber(new_page) > tonumber(page_count) then
	new_page = 1
	elseif tonumber(new_page) < 1 then
	new_page = tonumber(page_count)
	end
	local output = help.get_plugin_page(arguments_list, new_page)
	output = output .. mattata.escape_html(string.format(language['help']['3'], self.info.username))
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	output,
	'html',
	true,
	mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['4'],
	'help:results:' .. math.floor(tonumber(new_page) - 1)
	):callback_data_button(
	new_page .. '/' .. page_count,
	'help:pages:' .. new_page .. ':' .. page_count
	):callback_data_button(
	language['help']['5'] .. ' ' .. mattata.symbols.next,
	'help:results:' .. math.floor(tonumber(new_page) + 1)
	)
	):row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['6'],
	'help:back'
	):switch_inline_query_current_chat_button(
	'🔎 ' .. language['help']['7'],
	'/'
	)
	)
	)
	elseif callback_query.data == 'acmds' then
	local arguments_list = mattata.get_help(self, true, message.chat.id)
	local plugin_count = #arguments_list
	local page_count = math.floor(tonumber(plugin_count) / help.per_page)
	if math.floor(tonumber(plugin_count) / help.per_page) ~= tonumber(plugin_count) / help.per_page then
	page_count = page_count + 1
	end
	local output = help.get_plugin_page(arguments_list, 1)
	output = output .. mattata.escape_html(string.format(language['help']['3'], self.info.username))
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	output,
	'html',
	true,
	mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['4'],
	'help:aresults:0'
	):callback_data_button(
	'1/' .. page_count,
	'help:pages:1:' .. page_count
	):callback_data_button(
	language['help']['5'] .. ' ' .. mattata.symbols.next,
	'help:aresults:2'
	)
	):row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['6'],
	'help:back'
	)
	)
	)
	elseif callback_query.data:match('^aresults:%d*$') then
	local new_page = callback_query.data:match('^aresults:(%d*)$')
	local arguments_list = mattata.get_help(self, true, message.chat.id)
	local plugin_count = #arguments_list
	local page_count = math.floor(tonumber(plugin_count) / help.per_page)
	if math.floor(tonumber(plugin_count) / help.per_page) ~= tonumber(plugin_count) / help.per_page then
	page_count = page_count + 1
	end
	if tonumber(new_page) > tonumber(page_count) then
	new_page = 1
	elseif tonumber(new_page) < 1 then
	new_page = tonumber(page_count)
	end
	local output = help.get_plugin_page(arguments_list, new_page)
	output = output .. mattata.escape_html(string.format(language['help']['3'], self.info.username))
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	output,
	'html',
	true,
	mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['4'],
	'help:aresults:' .. math.floor(tonumber(new_page) - 1)
	):callback_data_button(
	new_page .. '/' .. page_count,
	'help:pages:' .. new_page .. ':' .. page_count
	):callback_data_button(
	language['help']['5'] .. ' ' .. mattata.symbols.next,
	'help:aresults:' .. math.floor(tonumber(new_page) + 1)
	)
	):row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['6'],
	'help:back'
	)
	)
	)
	elseif callback_query.data:match('^pages:%d:%d$') then
	local current_page, total_pages = callback_query.data:match('^pages:(%d):(%d)$')
	return mattata.answer_callback_query(
	callback_query.id,
	string.format(language['help']['8'], current_page, total_pages)
	)
	elseif callback_query.data:match('^ahelp:') then
	return mattata.answer_callback_query(callback_query.id, 'This is an old keyboard, please request a new one using /help!')
	elseif callback_query.data == 'links' then
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	language['help']['12'],
	nil,
	true,
	mattata.inline_keyboard():row(
	mattata.row():url_button(
	language['help']['13'],
	'https://t.me/mattataDev'
	):url_button(
	language['help']['14'],
	'https://t.me/mattata'
	):url_button(
	language['help']['15'],
	'https://t.me/mattataSupport'
	)
	):row(
	mattata.row():url_button(
	language['help']['16'],
	'https://t.me/mattataFAQ'
	):url_button(
	language['help']['17'],
	'https://github.com/wrxck/mattata'
	):url_button(
	language['help']['18'],
	'https://paypal.me/wrxck'
	)
	):row(
	mattata.row():url_button(
	language['help']['19'],
	'https://t.me/storebot?start=mattatabot'
	):url_button(
	language['help']['20'],
	'https://t.me/mattataLog'
	):url_button(
	'Twitter',
	'https://twitter.com/intent/user?screen_name=matt__hesketh'
	)
	):row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['6'],
	'help:back'
	)
	)
	)
	elseif callback_query.data == 'channels' then
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	language['help']['12'],
	nil,
	true,
	mattata.inline_keyboard():row(
	mattata.row():url_button(
	'no context',
	'https://t.me/no_context'
	)
	):row(
	mattata.row():callback_data_button(
	mattata.symbols.back .. ' ' .. language['help']['6'],
	'help:back'
	)
	)
	)
	elseif callback_query.data == 'settings' then
	if message.chat.type == 'supergroup' and not mattata.is_group_admin(message.chat.id, callback_query.from.id) then
	return mattata.answer_callback_query(callback_query.id, language['errors']['admin'])
	end
	return mattata.edit_message_reply_markup(
	message.chat.id,
	message.message_id,
	nil,
	(
	message.chat.type == 'supergroup'
	and mattata.is_group_admin(
	message.chat.id,
	callback_query.from.id
	)
	)
	and mattata.inline_keyboard()
	:row(
	mattata.row():callback_data_button(
	language['help']['21'], 'administration:' .. message.chat.id .. ':page:1'
	):callback_data_button(
	language['help']['22'], 'plugins:' .. message.chat.id .. ':page:1'
	)
	)
	:row(
	mattata.row():callback_data_button(
	language['help']['6'],
	'help:back'
	)
	) or mattata.inline_keyboard():row(
	mattata.row():callback_data_button(
	language['help']['22'], 'plugins:' .. message.chat.id .. ':page:1'
	)
	):row(
	mattata.row():callback_data_button(
	language['help']['6'], 'help:back'
	)
	)
	)
	elseif callback_query.data == 'back' then
	return mattata.edit_message_text(
	message.chat.id,
	message.message_id,
	string.format(
	language['help']['23'],
	mattata.escape_html(callback_query.from.first_name),
	mattata.escape_html(self.info.first_name),
	utf8.char(128513),
	utf8.char(128161),
	message.chat.type ~= 'private' and ' ' .. language['help']['24'] .. ' ' .. mattata.escape_html(message.chat.title) or '',
	utf8.char(128176)
	),
	'html',
	true,
	help.get_initial_keyboard(message.chat.type == 'supergroup' and message.chat.id or false)
	)
	end
	end

	function help:on_message(message, _, language)
	local input = mattata.input(message.text)
	if input and input:match('^[/!]?%w+$') then
	local plugin_documentation = false
	input = input:match('^/') and input or '/' .. input
	for _, v in pairs(self.plugin_list) do
	if v:match(input) then
	plugin_documentation = v
	end
	end
	if not plugin_documentation then -- if it wasn't a normal plugin, it might be an administrative one
	for _, v in pairs(self.administrative_plugin_list) do
	if v:match(input) then
	plugin_documentation = v
	end
	end
	end
	plugin_documentation = plugin_documentation or 'I couldn\'t find a plugin matching that command!'
	plugin_documentation = plugin_documentation .. '\n\nTo see all commands, just send /help.'
	return mattata.send_reply(message, plugin_documentation)
	end
	return mattata.send_message(
	message.chat.id,
	string.format(
	language['help']['23'],
	mattata.escape_html(message.from.first_name),
	mattata.escape_html(self.info.first_name),
	utf8.char(128513),
	utf8.char(128161),
	message.chat.type ~= 'private' and ' ' .. language['help']['24'] .. ' ' .. mattata.escape_html(message.chat.title) or '',
	utf8.char(128176)
	),
	'html',
	false,
	true,
	nil,
	help.get_initial_keyboard(message.chat.type == 'supergroup' and message.chat.id or false)
	)
	end

	return help

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