-- Module to display an icon with a tooltip such as "Edit this at Wikidata".

-- Icon is linked to the Wikidata entry for the article where this is placed.

-- This message is only displayed if a local_parameter is not supplied

-- i.e. when called from a template, it can be coded not to display the message.

-- The qid of a Wikidata entry can optionally be supplied for testing outside the article.

-- Usage:

-- {{#invoke:EditAtWikidata|showMessage|local_parameter}}

-- {{#invoke:EditAtWikidata|showMessage|qid=<ArticleID>|local_parameter}}



local p = {}



local i18n =

{

	"message" = "Edit this at Wikidata"

}



local function trimToNil(text)

	-- Return trimmed non-empty text, or nil.

	if type(text) == 'string' then

		return text:match('(%S.-)%s*$')

	end

end



function p._showMessage(args)

	local local_parm = trimToNil(args1])

	if local_parm then return "" end

	-- Parameter qid=x specifies the Wikidata ID for the article.

	-- This is not normally used except for testing outside the article.

	local qid = trimToNil(args.qid) or mw.wikibase.getEntityIdForCurrentPage()

	if qid and mw.wikibase.entityExists(qid) then

		-- Parameter pid=x uses x as an anchor in the link to the Wikidata entry.

		local anchor = trimToNil(args.pid)

		-- Parameter nbsp replaces the leading space with &nbsp;

		local space = trimToNil(args.nbsp) and "&nbsp;" or " "

		return

			space ..

			"[[File:OOjs UI icon edit-ltr-progressive.svg|frameless|text-top|10px" ..

			"|alt=" .. i18n.message ..

			"|link=https://www.wikidata.org/wiki/" .. qid ..

			(anchor and ("#" .. anchor) or "") ..

			"|class=noprint" ..

			"|" .. i18n.message ..

			"]]"

	end

	return ""

end



function p.showMessage(frame)

	return p._showMessage(frame.args)

end



return p