pipeworks/autocrafter.lua

function autocraft(inventory)
	local recipe=inventory:get_list("recipe")
	local result
	local new
	for i=1,9 do
		recipe[i]=ItemStack({name=recipe[i]:get_name(),count=1})
	end
	result,new=minetest.get_craft_result({method="normal",width=3,items=recipe})
	local input=inventory:get_list("input")
	if result.item:is_empty() then return end
	result=result.item
	if not inventory:room_for_item("dst", result) then return end
	local to_use={}
	for _,item in ipairs(recipe) do
		if item~=nil and not item:is_empty() then
			if to_use[item:get_name()]==nil then
				to_use[item:get_name()]=1
			else
				to_use[item:get_name()]=to_use[item:get_name()]+1
			end
		end
	end
	local stack
	for itemname,number in pairs(to_use) do
		stack=ItemStack({name=itemname, count=number})
		if not inventory:contains_item("src",stack) then return end
	end
	for itemname,number in pairs(to_use) do
		stack=ItemStack({name=itemname, count=number})
		inventory:remove_item("src",stack)
	end
	inventory:add_item("dst",result)
	for i=1,9 do
		inventory:add_item("dst",new.items[i])
	end
end

minetest.register_node("pipeworks:autocrafter",{
	description = "Autocrafter",
	drawtype="normal",
	tiles={"pipeworks_autocrafter.png"},
	groups={snappy=3,tubedevice=1,tubedevice_receiver=1},
	tube={insert_object=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			return inv:add_item("src",stack)
		end,
		can_insert=function(pos,node,stack,direction)
			local meta=minetest.env:get_meta(pos)
			local inv=meta:get_inventory()
			return inv:room_for_item("src",stack)
		end,
		input_inventory="dst"},
	on_construct = function(pos)
		local meta = minetest.env:get_meta(pos)
		meta:set_string("formspec",
				"size[8,11]"..
				"list[current_name;recipe;0,0;3,3;]"..
				"list[current_name;src;0,3.5;8,3;]"..
				"list[current_name;dst;4,0;4,3;]"..
				"list[current_player;main;0,7;8,4;]")
		meta:set_string("infotext", "Autocrafter")
		local inv = meta:get_inventory()
		inv:set_size("src",3*8)
		inv:set_size("recipe",3*3)
		inv:set_size("dst",4*3)
	end,
	can_dig = function(pos,player)
		local meta = minetest.env:get_meta(pos);
		local inv = meta:get_inventory()
		return (inv:is_empty("src") and inv:is_empty("recipe") and inv:is_empty("dst"))
	end})

minetest.register_abm({nodenames={"pipeworks:autocrafter"},interval=1,chance=1,
			action=function(pos,node)
				local meta=minetest.env:get_meta(pos)
				local inv=meta:get_inventory()
				autocraft(inv)
			end})