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stackoverflow.lua
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stackoverflow.lua
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--[[
Copyright 2020 Matthew Hesketh <matthew@matthewhesketh.com>
This code is licensed under the MIT. See LICENSE for details.
]]
local stackoverflow = {}
local mattata = require('mattata')
local https = require('ssl.https')
local url = require('socket.url')
local json = require('dkjson')
local ltn12 = require('ltn12')
local zlib = require('zlib')
local html = require('htmlEntities')
function stackoverflow:init()
stackoverflow.commands = mattata.commands(self.info.username):command('stackoverflow'):command('so').table
stackoverflow.help = '/stackoverflow [query] - Returns the first result for the given search query on Stack Overflow. Query can be given by replying to the message you want to search or specifying it as a parameter. Alias: /so.'
stackoverflow.url = 'https://api.stackexchange.com/2.2/search/advanced?'
end
function stackoverflow.on_message(_, message, configuration, language)
local input = message.reply and message.reply.text or mattata.input(message.text)
if not input then
return mattata.send_reply(message, stackoverflow.help)
elseif message.reply then
message.message_id = message.reply.message_id
end
local query = 'order=desc&sort=relevance&site=stackoverflow&q=' .. url.escape(input)
local response = {}
local _, res = https.request({
['url'] = stackoverflow.url .. query,
['method'] = 'GET',
['headers'] = {
['Content-Type'] = 'application/json',
['Content-Length'] = query:len(),
['Accept-Encoding'] = 'gzip'
},
['source'] = ltn12.source.string(input),
['sink'] = ltn12.sink.table(response)
})
if res ~= 200 then
return mattata.send_reply(message, language.errors.connection)
end
local jstr = table.concat(response)
jstr = zlib.decompress(jstr, 31)
local jdat = json.decode(jstr)
if not jdat.items or not jdat.items[1] then
return mattata.send_reply(message, language.errors.results)
end
local limit = message.chat.type == 'private' and configuration.limits.stackoverflow.private or configuration.limits.stackoverflow.public
local results = { '<b>Results for:</b> <em>' .. mattata.escape_html(input) .. '</em>' }
local count = 0
for i = 1, limit do
if i > #jdat.items then
break
end
local result = string.format('%s <a href="%s">%s</a>', mattata.symbols.bullet, jdat.items[i].link, mattata.escape_html(html.decode(jdat.items[i].title)))
table.insert(results, result)
count = count + 1
end
local output = table.concat(results, '\n')
return mattata.send_reply(message, output, 'html', true)
end
return stackoverflow

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