local p = {}

local Out_mt = {}
Out_mt.__index = Out_mt

function Out_mt:add(...)
	for i = 1, select('#', ...) do
		self.i = self.i + 1
		self[self.i] = select(i, ...)
	end
end

function Out_mt:__tostring()
	return table.concat(self)
end

function Out()
	local o = setmetatable({}, Out_mt)
	o.i = 0
	return o
end

function p.show(frame)
	local out = Out()
	
	local language_data = require 'Module:Wikt-lang/data'
	local Wiktionary = {
		--name_to_code = require 'Module:Language/Wiktionary name to code',
		--code_to_name = require 'Module:Language/Wiktionary code to name',
	}
	
	for code, data in require 'Module:TableTools'.sortedPairs(language_data.languages) do
		if not Wiktionary.code_to_name[code] then
			out:add(code)
			local Wiktionary_code = data.name and Wiktionary.name_to_code[data.name]
			if Wiktionary_code then
				out:add(' → ', Wiktionary_code)
				local MediaWiki_name = mw.language.fetchLanguageName(Wiktionary_code, 'en')
				if MediaWiki_name ~= data.name then
					out:add(' (MediaWiki: ',
						MediaWiki_name ~= '' and MediaWiki_name or '<none>',
						', Wiktionary: ', data.name, ')')
				end
			end
			out:add('\n* ')
		elseif data.name and data.name == mw.language.fetchLanguageName(code, 'en') then
			out:add(code, ' (', data.name, ')')
			out:add('\n* ')
		end
	end
	
	return out
end

return p