Modul:Qnr

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local p = {}

-- Get the Wikidata entity name for:
--	- With no arguments:
--		The item connected to the current page
--	- With one unnamed argument (title): 
--		The item connected to the page with the given title on this wiki
--	- With two unnamed arguments (title and language code):
--		The item connected to the page with the given title on the Wikipedia with the given language code
-- If no entity is found, and the given title is already in form of an entity name (like Q12345), it will be returned unchanged. Otherwise nothing will be returned, if no entity is found.

function p.qnr (frame)
	local page = mw.text.trim(frame.args[1] or '')
	if page == '' then
		return mw.wikibase.getEntityIdForCurrentPage()
	end
	local wiki = mw.text.trim(frame.args[2] or '')
	local item
	if wiki == '' then
		item = mw.wikibase.getEntityIdForTitle(page)
	else
		item = mw.wikibase.getEntityIdForTitle(page, wiki .. 'wiki')
	end
	if item then
		return item
	end
	return string.find(page, '^Q%d+$') and page
end

return p