/c game.player.gui.screen.autocoder_gui.destroy()

/c
local player = game.player

function autocoder_gui_open(player, entity)
	local screen = player.gui.screen
	if screen.autocoder_gui then
	--[[screen.autocoder_gui.destroy()
	game.print(game.tick..": destroying existing gui")--]]
		return
	end

	local main_frame = screen.add{
		type="frame",
		name="autocoder_gui",
		caption={"Hello, world!"}
	}
	player.opened = nil
	game.print(game.tick..": gui closed by assigning nil")
	player.opened = main_frame
	if not main_frame.valid then
		game.print(game.tick..": what?")
	else
		game.print(game.tick..": main frame valid and opened")

		main_frame.style.size = {
			385,
			165
		}
		main_frame.auto_center = true
	end
end

script.on_event(defines.events.on_gui_opened, function()
	autocoder_gui_open(player)
end)

script.on_event(defines.events.on_gui_closed, function()
	game.print(game.tick..": gui closed")
end)