[04:41:11] <arsdragonfly> pitriss: try this : function a() = minetest:register_craft_recipe()
  [04:42:21] <arsdragonfly> minetest:register_craft_recipe() = function if not (the recipe to be replaced) then a(parameter) end
  [04:43:03] <arsdragonfly> I'm not quite sure about the syntax, but I hope you get my point anyway :P 
  [04:43:35] <pitriss> arsdragonfly: ok i will try that morning.. now I'm going to sleep.. ty for advice..:)