load_graph_from_disk = function()
	local f = App.open_for_reading(Filename)
	Nodes = json.decode(f:read('*a'))
	f:close()
end

save_graph_to_disk = function()
	local f = App.open_for_writing(Filename)
	f:write(json.encode(Nodes))
	f:close()
end

		print('saving on quit')
		local f = App.open_for_writing(Filename)
		f:write(json.encode(Nodes))
		f:close()

		save_graph_to_disk()

		print('saving')
		local f = App.open_for_writing(Filename)
		f:write(json.encode(Nodes))
		f:close()
		Global_next_save = nil

		save_graph_to_disk()

		print(src.id, #Nodes[src.id].outgoing_edges)

		local f = App.open_for_reading(Filename)
		Nodes = json.decode(f:read('*a'))
		f:close()

		load_graph_from_disk()