Module:Title/redirectTarget

Documentation for this module may be created at Module:Title/redirectTarget/doc

local pcall = pcall

local at_limit

local function is_redirect(title)
	return title.isRedirect
end

--[==[
Returns the title object of the redirect target if title page is a redirect.

Checking {title.redirectTarget} will transclude the title page, which may be undesirable when checking large numbers of titles. To avoid this, this function will attempt to check the {title.isRedirect} key first, only checking {title.redirectTarget} if it is confirmed that the title is a redirect. However, doing so will increment the expensive function count, which has a limit of 500. Once the limit has been reached, this function reverts to checking {title.redirectTarget} directly instead.

The {force_transclusion} flag may be set to force the use of transclusion ({title.redirectTarget}) in all instances, which can be used to avoid incrementing the expensive function count; this is sometimes useful when making a large number of checks, as hitting the expensive function limit can be disruptive to other modules or templates.]==]
return function(title, force_transclusion)
	if not (force_transclusion or at_limit) then
		local success, result = pcall(is_redirect, title)
		if not success then
			at_limit = true
		elseif not result then
			return false
		end
	end
	local redirect = title.redirectTarget
	if not redirect then
		return false
	end
	-- If the original title had a fragment, carry it over to the redirect.
	local fragment = title.fragment
	if fragment and fragment ~= "" then
		redirect.fragment = fragment
	end
	return redirect
end