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Mikubot/plugins/wiki.lua
2015-11-12 17:42:03 +01:00

191 lines
4.7 KiB
Lua

-- http://git.io/vUA4M
local socket = require "socket"
local JSON = require "cjson"
local decodetext
do
local char, gsub, tonumber = string.char, string.gsub, tonumber
local function _(hex) return char(tonumber(hex, 16)) end
function decodetext(s)
s = gsub(s, '%%(%x%x)', _)
return s
end
end
local wikiusage = {
"/wiki [Begriff]: Poste Artikel von der deutschen Wikipedia",
"/wiki(lang) [Begriff]: Poste Artikel aus anderer Sprache. Beispiel: /wikien Hello",
"/wiki search [Begriff]: Suche Text auf der deutschen Wikipedia",
"/wiki(lang) search [Begriff]: Suche Text auf einer anderssprachigen Wikipedia. Beispiel: /wikien search Hello",
}
local Wikipedia = {
-- http://meta.wikimedia.org/wiki/List_of_Wikipedias
wiki_server = "https://%s.wikipedia.org",
wiki_path = "/w/api.php",
wiki_load_params = {
action = "query",
prop = "extracts",
format = "json",
exchars = 300,
exsectionformat = "plain",
explaintext = "",
redirects = ""
},
wiki_search_params = {
action = "query",
list = "search",
srlimit = 20,
format = "json",
},
default_lang = "de",
}
function Wikipedia:getWikiServer(lang)
return string.format(self.wiki_server, lang or self.default_lang)
end
--[[
-- return decoded JSON table from Wikipedia
--]]
function Wikipedia:loadPage(text, lang, intro, plain, is_search)
local request, sink = {}, {}
local query = ""
local parsed
if is_search then
for k,v in pairs(self.wiki_search_params) do
query = query .. k .. '=' .. v .. '&'
end
parsed = URL.parse(self:getWikiServer(lang))
parsed.path = self.wiki_path
parsed.query = query .. "srsearch=" .. URL.escape(text)
else
self.wiki_load_params.explaintext = plain and "" or nil
for k,v in pairs(self.wiki_load_params) do
query = query .. k .. '=' .. v .. '&'
end
parsed = URL.parse(self:getWikiServer(lang))
parsed.path = self.wiki_path
parsed.query = query .. "titles=" .. URL.escape(text)
end
-- HTTP request
request['url'] = URL.build(parsed)
print(request['url'])
request['method'] = 'GET'
request['sink'] = ltn12.sink.table(sink)
local httpRequest = parsed.scheme == 'http' and http.request or https.request
local code, headers, status = socket.skip(1, httpRequest(request))
if not headers or not sink then
return nil
end
local content = table.concat(sink)
if content ~= "" then
local ok, result = pcall(JSON.decode, content)
if ok and result then
return result
else
return nil
end
else
return nil
end
end
-- extract intro passage in wiki page
function Wikipedia:wikintro(text, lang)
local text = decodetext(text)
local result = self:loadPage(text, lang, true, true)
if result and result.query then
local query = result.query
if query and query.normalized then
text = query.normalized[1].to or text
end
local page = query.pages[next(query.pages)]
if page and page.extract then
local lang = lang or "de"
local title = page.title
local title_enc = URL.escape(title)
return title..":\n"..page.extract.."\n -- https://"..lang..".wikipedia.org/wiki/"..title_enc
else
local text = '"'..text..'" nicht gefunden.'
return text
end
else
return "Ein Fehler ist aufgetreten."
end
end
-- search for term in wiki
function Wikipedia:wikisearch(text, lang)
local result = self:loadPage(text, lang, true, true, true)
if result and result.query then
local titles = ""
for i,item in pairs(result.query.search) do
titles = titles .. "\n" .. item["title"]
end
titles = titles ~= "" and titles or "Keine Ergebnisse gefunden"
return titles
else
return "Ein Fehler ist aufgetreten."
end
end
local function run(msg, matches)
-- TODO: Remember language (i18 on future version)
-- TODO: Support for non Wikipedias but Mediawikis
local search, term, lang
if matches[1] == "search" then
search = true
term = matches[2]
lang = nil
elseif matches[2] == "search" then
search = true
term = matches[3]
lang = matches[1]
else
term = matches[2]
lang = matches[1]
end
if not term then
term = lang
lang = nil
end
if term == "" then
local text = "Befehle:\n"
text = text..table.concat(wikiusage, '\n')
return text
end
local result
if search then
result = Wikipedia:wikisearch(term, lang)
else
result = Wikipedia:wikintro(term, lang)
end
return result
end
return {
description = "Sendet Wikipedia Artikel",
usage = wikiusage,
patterns = {
"^/[Ww]iki(%w+) (search) (.+)$",
"^/[Ww]iki (search) ?(.*)$",
"^/[Ww]iki(%w+) (.+)$",
"^/[Ww]iki ?(.*)$",
"(%w+).wikipedia.org/wiki/(.+)"
},
run = run
}