Defold - menu and loader

loader.script.lua

local score = 0

local function load_menu(score_in)
	msg.post("loader#mainmenu", "load")
	if not (score_in == nil) then
		score = score_in
	end
end

local function unload_menu()
	msg.post("loader#mainmenu", "unload")
end

local function load_game()
	msg.post("loader#level", "load")
end
	
local function unload_game()
	msg.post("loader#level", "unload")
end

function init(self)
	msg.post(".", "acquire_input_focus")
	load_menu()
end

function on_message(self, message_id, message, sender)
	if message_id == hash("start_game") then
		unload_menu()
		load_game()
	elseif message_id == hash("game_over") then
		unload_game()
		load_menu(message.score)
	elseif message_id == hash("proxy_loaded") then
		msg.post(sender, "enable")
		msg.post("mainmenu:/go", "score", { score = score })
	end
end

menu.gui_script.lua

function init(self)
	msg.post(".", "acquire_input_focus")
end

function on_message(self, message_id, message, sender)
	if message_id == hash("score") then
		local scorenode = gui.get_node("score")
		gui.set_text(scorenode, "SCORE: " .. message.score)
	end
end

function on_input(self, action_id, action)
	if (action_id == hash("click") and action.released == true) then
		local textStart = gui.get_node("start")
		local textExit = gui.get_node("exit")
		if (gui.pick_node(textStart, action.x, action.y)) then
			msg.post("loader:/loader#loader", "start_game")
		elseif (gui.pick_node(textExit, action.x, action.y)) then
			msg.post("@system:", "exit", {code = 0})
		end
	end
end