Module:Twinkle optout

local Arguments = require('Module:Arguments')
local TableTools = require('Module:TableTools')
local p = {}

local RECOGNIZED_TYPES = TableTools.listToSet{
	'csd', 'prod', 'xfd', 'afd', 'tfd', 'ffd', 'rfd', 'mfd', 'cfd'
}

p.main = function(frame)
	local args = Arguments.getArgs(frame)
	return p.make_link(args[1])
end

p.make_link = function(types)
	if types == nil then
		return error('no notice types specified')
	end
	if mw.title.getCurrentTitle().namespace ~= 3 then
		return error('{{twinkle optout}} can only used on user talk pages')
	end
	types = types:gsub('%s+', '')
	local types_list = mw.text.split(types, ',')
	for idx, type_name in ipairs(types_list) do
		if RECOGNIZED_TYPES[type_name:lower()] == nil then
			return error('unrecognized notice type: ' .. type_name)
		end
	end
	return '<span style="display: none">https://optout.twinkle?types='..mw.uri.encode(types:lower())..'</span>'
end

return p