minetest.register_on_joinplayer(function(player)
player:set_inventory_formspec(
    "size[8,7.8]"..
    "bgcolor[#000A;true]"..
    "listcolors[#8A8A8AFF;#C0C0C0;#0002;#FFF;#000]"..
    "background[2,2;0,0;inv_bg.png;true]"..
    "list[current_player;main;0,4.8;8,3;8]"..
    "list[current_player;main;0,3.5;8,1;]"..
    "list[current_player;craft;3,0;3,3;]"..
    "list[current_player;craftpreview;7,1;1,1;]"
    )
end)