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Mikubot-2/utilities.lua

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-- utilities.lua
-- Functions shared among plugins.
-- you're welcome, brayden :^)
HTTP = HTTP or require('socket.http')
HTTPS = HTTPS or require('ssl.https')
JSON = JSON or require('cjson')
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-- get the indexed word in a string
get_word = function(s, i)
s = s or ''
i = i or 1
local t = {}
for w in s:gmatch('%g+') do
table.insert(t, w)
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end
return t[i] or false
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end
-- Returns the string after the first space.
function string:input()
if not self:find(' ') then
return false
end
return self:sub(self:find(' ')+1)
end
-- I swear, I copied this from PIL, not yago! :)
function string:trim() -- Trims whitespace from a string.
local s = self:gsub('^%s*(.-)%s*$', '%1')
return s
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end
local lc_list = {
-- Latin = 'Cyrillic'
['A'] = 'А',
['B'] = 'В',
['C'] = 'С',
['E'] = 'Е',
['I'] = 'І',
['J'] = 'Ј',
['K'] = 'К',
['M'] = 'М',
['H'] = 'Н',
['O'] = 'О',
['P'] = 'Р',
['S'] = 'Ѕ',
['T'] = 'Т',
['X'] = 'Х',
['Y'] = 'Ү',
['a'] = 'а',
['c'] = 'с',
['e'] = 'е',
['i'] = 'і',
['j'] = 'ј',
['o'] = 'о',
['s'] = 'ѕ',
['x'] = 'х',
['y'] = 'у',
['!'] = 'ǃ'
}
-- Replaces letters with corresponding Cyrillic characters.
latcyr = function(str)
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for k,v in pairs(lc_list) do
str = string.gsub(str, k, v)
end
return str
end
-- Loads a JSON file as a table.
load_data = function(filename)
local f = io.open(filename)
if not f then
return {}
end
local s = f:read('*all')
f:close()
local data = JSON.decode(s)
return data
end
-- Saves a table to a JSON file.
save_data = function(filename, data)
local s = JSON.encode(data)
local f = io.open(filename, 'w')
f:write(s)
f:close()
end
-- Gets coordinates for a location. Used by gMaps.lua, time.lua, weather.lua.
get_coords = function(input)
local url = 'http://maps.googleapis.com/maps/api/geocode/json?address=' .. URL.escape(input)
local jstr, res = HTTP.request(url)
if res ~= 200 then
return config.errors.connection
end
local jdat = JSON.decode(jstr)
if jdat.status == 'ZERO_RESULTS' then
return config.errors.results
end
return {
lat = jdat.results[1].geometry.location.lat,
lon = jdat.results[1].geometry.location.lng
}
end
-- Get the number of values in a key/value table.
table_size = function(tab)
local i = 0
for k,v in pairs(tab) do
i = i + 1
end
return i
end
resolve_username = function(target)
-- If $target is a known username, returns associated ID.
-- If $target is an unknown username, returns nil.
-- If $target is a number, returns that number.
-- Otherwise, returns false.
local input = tostring(target):lower()
if input:match('^@') then
local uname = input:gsub('^@', '')
return database.usernames[uname]
else
return tonumber(target) or false
end
end
handle_exception = function(err, message)
if not err then err = '' end
local output = '\n[' .. os.date('%F %T', os.time()) .. ']\n' .. bot.username .. ': ' .. err .. '\n' .. message .. '\n'
if config.log_chat then
output = '```' .. output .. '```'
sendMessage(config.log_chat, output, true, nil, true)
else
print(output)
end
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end
-- Okay, this one I actually did copy from yagop.
-- https://github.com/yagop/telegram-bot/blob/master/bot/utils.lua
download_file = function(url, filename)
local respbody = {}
local options = {
url = url,
sink = ltn12.sink.table(respbody),
redirect = true
}
local response = nil
if url:match('^https') then
options.redirect = false
response = { HTTPS.request(options) }
else
response = { HTTP.request(options) }
end
local code = response[2]
local headers = response[3]
local status = response[4]
if code ~= 200 then return false end
filename = filename or '/tmp/' .. os.time()
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local file = io.open(filename, 'w+')
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file:write(table.concat(respbody))
file:close()
return filename
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end