# Module:Official website

local makeUrl = require('Module:URL')._url  
local p = {}  
-- Wrapper for pcall which returns nil on failure.
local function quickPcall(func)
local success, result = pcall(func)
if success then
return result
end
end  
-- Gets the rank for a Wikidata property table. Returns 1, 0 or -1, in
-- order of rank.
local function getRank(prop)
local rank = prop.rank
if rank == 'preferred' then
return 1
elseif rank == 'normal' then
return 0
elseif rank == 'deprecated' then
return -1
else
-- No rank or undefined rank is treated as "normal".
return 0
end
end  
-- Finds whether a Wikidata property is qualified as being in English.
local function isEnglish(prop)
local ret = quickPcall(function
for i, lang in ipairs(prop.qualifiers.P407) do
if lang.datavalue.value['numeric-id'] == 1860 then
return true
end
end
return false
end)
return ret == true
end  
-- Fetches the official website URL from Wikidata.
local fetchWikidataUrl
fetchWikidataUrl = function
-- Get objects for all official sites on Wikidata.
local websites = quickPcall(function
return mw.wikibase.getAllStatements(mw.wikibase.getEntityIdForCurrentPage, 'P856')
end)  
-- Clone the objects in case other code needs them in their original order.
websites = websites and mw.clone(websites) or {}  
-- Add the table index to the objects in case it is needed in the sort.
for i, website in ipairs(websites) do
website._index = i
end  
-- Sort the websites, first by highest rank, and then by websites in the
-- English language, then by the website's original position in the
-- property list. When we are done, get the URL from the highest-sorted
-- object.
table.sort(websites, function(ws1, ws2)
local r1 = getRank(ws1)
local r2 = getRank(ws2)
if r1 ~= r2 then
return r1 > r2
end
local e1 = isEnglish(ws1)
local e2 = isEnglish(ws2)
if e1 ~= e2 then
return e1
end
return ws1._index < ws2._index
end)
local url = quickPcall(function
return websites[1].mainsnak.datavalue.value
end)  
-- Cache the result so that we only do the heavy lifting once per #invoke.
fetchWikidataUrl = function
return url
end  
return url
end  
-- Render the URL link, plus other visible output.
local function renderUrl(options)
if not options.url and not options.wikidataurl then
local qid = mw.wikibase.getEntityIdForCurrentPage
local result = '<strong>' ..
'No URL found. Please specify a URL here or add one to Wikidata.' ..
'</strong>'
if qid then
result = result.. ' '
end
return result
end
local ret = {}
ret[#ret + 1] = string.format(
'<span>%s</span>',
makeUrl(options.url or options.wikidataurl, options.display)
if options.wikidataurl and not options.url then
local qid = mw.wikibase.getEntityIdForCurrentPage
if qid then
ret[#ret + 1] = ''
end
end
return table.concat(ret, ' ')
end  
-- Render the tracking category.
local function renderTrackingCategory(url, wikidataurl)
if mw.title.getCurrentTitle.namespace ~= 0 then
return ''
end
local category
if not url and not wikidataurl then
category = 'Official website missing URL'
elseif not url and wikidataurl then
return ''
elseif url and wikidataurl then
if url:gsub('/%s*$', *) ~= wikidataurl:gsub('/%s*$', *) then
category = 'Official website different in Wikidata and Wikipedia'
end
else
category = 'Official website not in Wikidata'
end
return category and string.format(*, category) or *
end  
function p._main(args)
local url = args[1] or args.URL or args.url
local wikidataurl = fetchWikidataUrl
local formattedUrl = renderUrl{
url = url,
wikidataurl = wikidataurl,
display = args[2] or args.name or 'அதிகாரப்பூர்வ இணையதளம்'
}
return formattedUrl .. renderTrackingCategory(url, wikidataurl)
end  
function p.main
local args = require('Module:Arguments').getArgs(, {
wrappers = 'Template:Official website'
})
return p._main(args)
end  
return p