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Mikubot-2/plugins/calc.lua

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local calc = {}
local URL = require('socket.url')
local HTTPS = require('ssl.https')
local bindings = require('bindings')
local utilities = require('utilities')
calc.command = 'calc <expression>'
calc.doc = [[```
/calc <expression>
Returns solutions to mathematical expressions and conversions between common units. Results provided by mathjs.org.
```]]
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function calc:init()
calc.triggers = utilities.triggers(self.info.username):t('calc', true).table
end
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function calc:action(msg)
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local input = utilities.input(msg.text)
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if not input then
if msg.reply_to_message and msg.reply_to_message.text then
input = msg.reply_to_message.text
else
bindings.sendMessage(msg.chat.id, calc.doc, true, msg.message_id, true)
return
end
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end
local url = 'https://api.mathjs.org/v1/?expr=' .. URL.escape(input)
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local output = HTTPS.request(url)
if not output then
bindings.sendReply(self, msg, self.config.errors.connection)
return
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end
output = '`' .. output .. '`'
bindings.sendMessage(self, msg.chat.id, output, true, msg.message_id, true)
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end
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return calc