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Mikubot-2/plugins/calc.lua

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local command = 'calc <expression>'
local doc = [[```
/calc <expression>
Returns solutions to mathematical expressions and conversions between common units. Results provided by mathjs.org.
```]]
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local triggers = {
'^/calc[@'..bot.username..']*'
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}
local action = function(msg)
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local input = msg.text:input()
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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
sendMessage(msg.chat.id, 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
sendReply(msg, config.errors.connection)
return
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end
output = '`' .. output .. '`'
sendMessage(msg.chat.id, output, true, msg.message_id, true)
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end
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return {
action = action,
triggers = triggers,
command = command,
doc = doc
}