Mòideal:utilities

---

local export = {}

-- Format the categories with the appropriate sort key
function export.format_categories(categories, lang, sort_key, sort_base)
	NAMESPACE = NAMESPACE or mw.title.getCurrentTitle().nsText
	
	if NAMESPACE == "" or NAMESPACE == "Appendix" then
		PAGENAME = PAGENAME or mw.title.getCurrentTitle().text
		SUBPAGENAME = SUBPAGENAME or mw.title.getCurrentTitle().subpageText
		
		if not lang then
			lang = require("Module:languages").getByCode("und")
		end
		
		-- Generate a default sort key
		sort_base = lang:makeSortKey(sort_base or SUBPAGENAME)
		
		if sort_key then
			-- Gather some statistics regarding sort keys
			if mw.ustring.lower(sort_key) == sort_base then
				table.insert(categories, "Sort key tracking/redundant")
			elseif lang:getCode() ~= "und" and lang:getCode() ~= "cmn" and lang:getCode() ~= "ja" and lang:getCode() ~= "zu" and lang:getCode() ~= "nan" and lang:getCode() ~= "yue" and lang:getCode() ~= "ko" then
				if lang:getCode() == "ga" or lang:getCode() == "gv" or lang:getCode() == "nv" or lang:getCode() == "roa-jer" or lang:getCode() == "fr" or lang:getCode() == "rm" or lang:getCode() == "prg" or lang:getCode() == "gd" or lang:getCode() == "twf" or lang:getCode() == "en" or lang:getCode() == "ro" or lang:getCode() == "egl" or lang:getCode() == "roa-tar" or lang:getCode() == "gl" or lang:getCode() == "ast" or lang:getCode() == "br" then
					table.insert(categories, "Sort key tracking/needed/" .. lang:getCode())
				else
					table.insert(categories, "Sort key tracking/needed")
				end
			end
		else
			sort_key = sort_base
		end
		
		-- If the resulting key is the same as the wiki software's default, remove it
		if sort_key == PAGENAME then
			sort_key = nil
		end
		
		for key, cat in ipairs(categories) do
			categories[key] = "[[Category:" .. cat .. (sort_key and "|" .. sort_key or "") .. "]]"
		end
		
		return table.concat(categories, "")
	else
		return ""
	end
end

-- Used by {{categorize}}
function export.template_categorize(frame)
	NAMESPACE = NAMESPACE or mw.title.getCurrentTitle().nsText
	local format = frame.args["format"]
	local args = frame:getParent().args
	
	local langcode = args[1]; if langcode == "" then langcode = nil end
	local sort_key = args["sort"]; if sort_key == "" then sort_key = nil end
	local categories = {}
	
	if not langcode then
		if NAMESPACE == "Teamplaid" then return "" end
		error("Language code has not been specified. Please pass parameter 1 to the template.")
	end
	
	local lang = require("Module:languages").getByCode(langcode)
	
	if not lang then
		if NAMESPACE == "Teamplaid" then return "" end
		error("The language code \"" .. langcode .. "\" is not valid.")
	end
	
	local prefix = ""
	
	if format == "pos" then
		prefix = lang:getCanonicalName() .. " "
	elseif format == "topic" then
		prefix = lang:getCode() .. ":"
	end
	
	local i = 2
	local cat = args[i]
	
	while cat do
		if cat ~= "" then
			table.insert(categories, prefix .. cat)
		end
		
		i = i + 1
		cat = args[i]
	end
	
	return export.format_categories(categories, lang, sort_key)
end

return export