358 lines
8.4 KiB
Lua
358 lines
8.4 KiB
Lua
-- utilities.lua
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-- Functions shared among plugins.
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local utilities = {}
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local HTTP = require('socket.http')
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local ltn12 = require('ltn12')
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local HTTPS = require('ssl.https')
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local URL = require('socket.url')
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local JSON = require('dkjson')
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local bindings = require('otouto.bindings')
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-- For the sake of ease to new contributors and familiarity to old contributors,
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-- we'll provide a couple of aliases to real bindings here.
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function utilities:send_message(chat_id, text, disable_web_page_preview, reply_to_message_id, use_markdown)
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return bindings.request(self, 'sendMessage', {
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chat_id = chat_id,
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text = text,
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disable_web_page_preview = disable_web_page_preview,
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reply_to_message_id = reply_to_message_id,
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parse_mode = use_markdown and 'Markdown' or nil
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} )
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end
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function utilities:send_reply(old_msg, text, use_markdown)
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return bindings.request(self, 'sendMessage', {
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chat_id = old_msg.chat.id,
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text = text,
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disable_web_page_preview = true,
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reply_to_message_id = old_msg.message_id,
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parse_mode = use_markdown and 'Markdown' or nil
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} )
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end
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-- get the indexed word in a string
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function utilities.get_word(s, i)
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s = s or ''
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i = i or 1
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local t = {}
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for w in s:gmatch('%g+') do
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table.insert(t, w)
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end
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return t[i] or false
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end
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-- Like get_word(), but better.
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-- Returns the actual index.
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function utilities.index(s)
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local t = {}
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for w in s:gmatch('%g+') do
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table.insert(t, w)
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end
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return t
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end
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-- Returns the string after the first space.
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function utilities.input(s)
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if not s:find(' ') then
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return false
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end
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return s:sub(s:find(' ')+1)
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end
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-- Calculates the length of the given string as UTF-8 characters
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function utilities.utf8_len(s)
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local chars = 0
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for i = 1, string.len(s) do
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local b = string.byte(s, i)
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if b < 128 or b >= 192 then
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chars = chars + 1
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end
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end
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return chars
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end
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-- Trims whitespace from a string.
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function utilities.trim(str)
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local s = str:gsub('^%s*(.-)%s*$', '%1')
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return s
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end
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-- Loads a JSON file as a table.
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function utilities.load_data(filename)
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local f = io.open(filename)
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if not f then
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return {}
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end
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local s = f:read('*all')
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f:close()
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local data = JSON.decode(s)
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return data
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end
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-- Saves a table to a JSON file.
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function utilities.save_data(filename, data)
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local s = JSON.encode(data)
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local f = io.open(filename, 'w')
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f:write(s)
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f:close()
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end
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-- Gets coordinates for a location. Used by gMaps.lua, time.lua, weather.lua.
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function utilities.get_coords(input, config)
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local url = 'http://maps.googleapis.com/maps/api/geocode/json?address=' .. URL.escape(input)
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local jstr, res = HTTP.request(url)
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if res ~= 200 then
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return config.errors.connection
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end
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local jdat = JSON.decode(jstr)
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if jdat.status == 'ZERO_RESULTS' then
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return config.errors.results
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end
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return {
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lat = jdat.results[1].geometry.location.lat,
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lon = jdat.results[1].geometry.location.lng
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}
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end
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-- Get the number of values in a key/value table.
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function utilities.table_size(tab)
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local i = 0
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for _,_ in pairs(tab) do
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i = i + 1
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end
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return i
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end
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-- Just an easy way to get a user's full name.
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-- Alternatively, abuse it to concat two strings like I do.
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function utilities.build_name(first, last)
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if last then
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return first .. ' ' .. last
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else
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return first
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end
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end
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function utilities:resolve_username(input)
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input = input:gsub('^@', '')
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for _, user in pairs(self.database.users) do
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if user.username and user.username:lower() == input:lower() then
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local t = {}
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for key, val in pairs(user) do
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t[key] = val
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end
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return t
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end
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end
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end
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-- Simpler than above function; only returns an ID.
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-- Returns nil if no ID is available.
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function utilities:id_from_username(input)
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input = input:gsub('^@', '')
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for _, user in pairs(self.database.users) do
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if user.username and user.username:lower() == input:lower() then
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return user.id
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end
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end
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end
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-- Simpler than below function; only returns an ID.
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-- Returns nil if no ID is available.
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function utilities:id_from_message(msg)
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if msg.reply_to_message then
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return msg.reply_to_message.from.id
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else
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local input = utilities.input(msg.text)
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if input then
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if tonumber(input) then
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return tonumber(input)
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elseif input:match('^@') then
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return utilities.id_from_username(self, input)
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end
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end
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end
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end
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function utilities:user_from_message(msg, no_extra)
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local input = utilities.input(msg.text_lower)
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local target = {}
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if msg.reply_to_message then
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for k,v in pairs(self.database.users[msg.reply_to_message.from.id_str]) do
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target[k] = v
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end
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elseif input and tonumber(input) then
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target.id = tonumber(input)
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if self.database.users[input] then
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for k,v in pairs(self.database.users[input]) do
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target[k] = v
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end
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end
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elseif input and input:match('^@') then
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local uname = input:gsub('^@', '')
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for _,v in pairs(self.database.users) do
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if v.username and uname == v.username:lower() then
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for key, val in pairs(v) do
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target[key] = val
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end
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end
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end
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if not target.id then
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target.err = 'Sorry, I don\'t recognize that username.'
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end
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else
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target.err = 'Please specify a user via reply, ID, or username.'
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end
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if not no_extra then
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if target.id then
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target.id_str = tostring(target.id)
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end
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if not target.first_name then
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target.first_name = 'User'
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end
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target.name = utilities.build_name(target.first_name, target.last_name)
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end
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return target
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end
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function utilities:handle_exception(err, message, config)
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if not err then err = '' end
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local output = '\n[' .. os.date('%F %T', os.time()) .. ']\n' .. self.info.username .. ': ' .. err .. '\n' .. message .. '\n'
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if config.log_chat then
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output = '```' .. output .. '```'
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utilities.send_message(self, config.log_chat, output, true, nil, true)
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else
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print(output)
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end
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end
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function utilities.download_file(url, filename)
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if not filename then
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filename = url:match('.+/(.-)$') or os.time()
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filename = '/tmp/' .. filename
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end
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local body = {}
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local doer = HTTP
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local do_redir = true
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if url:match('^https') then
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doer = HTTPS
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do_redir = false
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end
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local _, res = doer.request{
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url = url,
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sink = ltn12.sink.table(body),
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redirect = do_redir
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}
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if res ~= 200 then return false end
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local file = io.open(filename, 'w+')
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file:write(table.concat(body))
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file:close()
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return filename
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end
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function utilities.markdown_escape(text)
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text = text:gsub('_', '\\_')
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text = text:gsub('%[', '\\[')
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text = text:gsub('%]', '\\]')
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text = text:gsub('%*', '\\*')
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text = text:gsub('`', '\\`')
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return text
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end
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utilities.md_escape = utilities.markdown_escape
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utilities.triggers_meta = {}
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utilities.triggers_meta.__index = utilities.triggers_meta
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function utilities.triggers_meta:t(pattern, has_args)
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local username = self.username:lower()
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table.insert(self.table, '^'..self.cmd_pat..pattern..'$')
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table.insert(self.table, '^'..self.cmd_pat..pattern..'@'..username..'$')
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if has_args then
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table.insert(self.table, '^'..self.cmd_pat..pattern..'%s+[^%s]*')
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table.insert(self.table, '^'..self.cmd_pat..pattern..'@'..username..'%s+[^%s]*')
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end
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return self
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end
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function utilities.triggers(username, cmd_pat, trigger_table)
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local self = setmetatable({}, utilities.triggers_meta)
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self.username = username
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self.cmd_pat = cmd_pat
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self.table = trigger_table or {}
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return self
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end
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function utilities.with_http_timeout(timeout, fun)
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local original = HTTP.TIMEOUT
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HTTP.TIMEOUT = timeout
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fun()
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HTTP.TIMEOUT = original
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end
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function utilities.pretty_float(x)
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if x % 1 == 0 then
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return tostring(math.floor(x))
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else
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return tostring(x)
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end
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end
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-- This table will store unsavory characters that are not properly displayed,
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-- or are just not fun to type.
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utilities.char = {
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zwnj = '',
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arabic = '[\216-\219][\128-\191]',
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rtl_override = '',
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rtl_mark = '',
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em_dash = '—',
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utf_8 = '([%z\1-\127\194-\244][\128-\191]*)',
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}
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utilities.set_meta = {}
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utilities.set_meta.__index = utilities.set_meta
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function utilities.new_set()
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return setmetatable({__count = 0}, utilities.set_meta)
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end
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function utilities.set_meta:add(x)
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if x == "__count" then
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return false
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else
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if not self[x] then
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self[x] = true
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self.__count = self.__count + 1
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end
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return true
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end
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end
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function utilities.set_meta:remove(x)
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if x == "__count" then
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return false
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else
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if self[x] then
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self[x] = nil
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self.__count = self.__count - 1
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end
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return true
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end
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end
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function utilities.set_meta:__len()
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return self.__count
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end
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return utilities
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