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Mikubot-2/otouto/plugins/wikipedia.lua

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local wikipedia = {}
local HTTPS = require('ssl.https')
local URL = require('socket.url')
local JSON = require('dkjson')
local utilities = require('utilities')
wikipedia.command = 'wikipedia <query>'
function wikipedia:init(config)
wikipedia.triggers = utilities.triggers(self.info.username, config.cmd_pat):t('wikipedia', true):t('wiki', true):t('w', true).table
wikipedia.doc = [[```
]]..config.cmd_pat..[[wikipedia <query>
Returns an article from Wikipedia.
Aliases: ]]..config.cmd_pat..[[w, ]]..config.cmd_pat..[[wiki
```]]
end
local get_title = function(search)
for _,v in ipairs(search) do
if not v.snippet:match('may refer to:') then
return v.title
end
end
return false
end
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function wikipedia:action(msg, config)
-- Get the query. If it's not in the message, check the replied-to message.
-- If those don't exist, send the help text.
local input = utilities.input(msg.text)
if not input then
if msg.reply_to_message and msg.reply_to_message.text then
input = msg.reply_to_message.text
else
utilities.send_message(self, msg.chat.id, wikipedia.doc, true, msg.message_id, true)
return
end
end
-- This kinda sucks, but whatever.
input = input:gsub('#', ' sharp')
-- Disclaimer: These variables will be reused.
local jstr, res, jdat
-- All pretty standard from here.
local search_url = 'https://en.wikipedia.org/w/api.php?action=query&list=search&format=json&srsearch='
jstr, res = HTTPS.request(search_url .. URL.escape(input))
if res ~= 200 then
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utilities.send_reply(self, msg, config.errors.connection)
return
end
jdat = JSON.decode(jstr)
if jdat.query.searchinfo.totalhits == 0 then
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utilities.send_reply(self, msg, config.errors.results)
return
end
local title = get_title(jdat.query.search)
if not title then
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utilities.send_reply(self, msg, config.errors.results)
return
end
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local res_url = 'https://en.wikipedia.org/w/api.php?action=query&prop=extracts&format=json&exchars=4000&exsectionformat=plain&titles='
jstr, res = HTTPS.request(res_url .. URL.escape(title))
if res ~= 200 then
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utilities.send_reply(self, msg, config.errors.connection)
return
end
local _
local text = JSON.decode(jstr).query.pages
_, text = next(text)
if not text then
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utilities.send_reply(self, msg, config.errors.results)
return
else
text = text.extract
end
-- Remove needless bits from the article, take only the first paragraph.
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text = text:gsub('</?.->', '')
local l = text:find('\n')
if l then
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text = text:sub(1, l-1)
end
-- This block can be annoying to read.
-- We use the initial title to make the url for later use. Then we remove
-- the extra bits that won't be in the article. We determine whether the
-- first part of the text is the title, and if so, we embolden that.
-- Otherwise, we prepend the text with a bold title. Then we append a "Read
-- More" link.
local url = 'https://en.wikipedia.org/wiki/' .. URL.escape(title)
title = title:gsub('%(.+%)', '')
local output
if string.match(text:sub(1, title:len()), title) then
output = '*' .. title .. '*' .. text:sub(title:len()+1)
else
output = '*' .. title:gsub('%(.+%)', '') .. '*\n' .. text:gsub('%[.+%]','')
end
output = output .. '\n[Read more.](' .. url:gsub('%)', '\\)') .. ')'
utilities.send_message(self, msg.chat.id, output, true, nil, true)
end
return wikipedia