currency.mattata
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currency.mattata
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	--[[
	Based on a plugin by topkecleon.
	Copyright 2020 Matthew Hesketh <wrxck0@gmail.com>
	This code is licensed under the MIT. See LICENSE for details.
	]]

	local currency = {}
	local mattata = require('mattata')
	local https = require('ssl.https')

	function currency:init()
	currency.commands = mattata.commands(self.info.username):command('currency'):command('convert'):command('cash').table
	currency.help = '/currency <amount> <from> to <to> - Converts exchange rates for various currencies via Google Finance. Aliases: /convert, /cash.'
	currency.url = 'https://www.google.com/finance/converter?from=%s&to=%s&a=%s'
	end

	function currency.on_message(_, message, _, language)
	local input = mattata.input(message.text:upper())
	if input then
	input = input:gsub('%$', 'USD'):gsub('€', 'EUR'):gsub('£', 'GBP')
	end
	if not input or not input:match('^.- %a%a%a TO %a%a%a$') then
	return mattata.send_reply(message, currency.help)
	end
	local amount, from, to = input:match('^(.-) (%a%a%a) TO (%a%a%a)$')
	amount = tonumber(amount) or 1
	local result = 1
	if from ~= to then
	local str, res = https.request(string.format(currency.url, from, to, amount))
	if res ~= 200 then
	return mattata.send_reply(message, language.errors.connection)
	end
	str = str:match('<span class=bld>(.-) %u+</span>')
	if not str then
	return mattata.send_reply(message, language.errors.results)
	end
	result = string.format('%.2f', str)
	end
	result = string.format('%s %s = %s %s', amount, from, result, to)
	return mattata.send_message(message.chat.id, result)
	end

	return currency