VoxeLibre/mods/mcl_furnaces/init.lua

local furnace_inactive_formspec =
	"size[9,8.75]"..
	"background[-0.19,-0.25;9.41,9.49;crafting_formspec_bg.png^crafting_inventory_furnace.png]"..
	mcl_core.inventory_header..
	"list[current_player;main;0,4.5;9,3;9]"..
	"list[current_player;main;0,7.74;9,1;]"..
	"list[current_name;src;2.75,0.5;1,1;]"..
	"list[current_name;fuel;2.75,2.5;1,1;]"..
	"list[current_name;dst;5.75,1.5;1,1;]"..
	"image[2.75,1.5;1,1;default_furnace_fire_bg.png]"..
	"image_button[8,0;1,1;craftguide_book.png;__mcl_craftguide;]"..
	"tooltip[__mcl_craftguide;Show crafting recipes]"..
	"listring[current_name;dst]"..
	"listring[current_player;main]"..
	"listring[current_name;src]"..
	"listring[current_player;main]"..
	"listring[current_name;fuel]"..
	"listring[current_player;main]"

local craftguide = function(pos, formname, fields, sender)
	if fields.__mcl_craftguide then
		mcl_craftguide.show_craftguide(sender)
	end
end

minetest.register_node("mcl_furnaces:furnace", {
	description = "Furnace",
	tiles = {"default_furnace_top.png", "default_furnace_bottom.png", "default_furnace_side.png",
		"default_furnace_side.png", "default_furnace_side.png", "default_furnace_front.png"},
	paramtype2 = "facedir",
	is_ground_content = false,
	stack_max = 64,
	groups = {cracky=2, deco_block=1},
	sounds = mcl_core.node_sound_stone_defaults(),
	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", furnace_inactive_formspec)
		local inv = meta:get_inventory()
		inv:set_size("fuel", 1)
		inv:set_size("src", 1)
		inv:set_size("dst", 1)
	end,
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for _, listname in ipairs({"src", "dst", "fuel"}) do
			local stack = inv:get_stack(listname, 1)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,
	allow_metadata_inventory_put = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		if listname == "fuel" then
			if minetest.get_craft_result({method="fuel",width=1,items={stack}}).time ~= 0 then
				return stack:get_count()
			else
				return 0
			end
		elseif listname == "src" then
			return stack:get_count()
		elseif listname == "dst" then
			return 0
		end
	end,
	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		local stack = inv:get_stack(from_list, from_index)
		if to_list == "fuel" then
			if minetest.get_craft_result({method="fuel",width=1,items={stack}}).time ~= 0 then
				return count
			else
				return 0
			end
		elseif to_list == "src" then
			return count
		elseif to_list == "dst" then
			return 0
		end
	end,
	on_receive_fields = craftguide,
})

minetest.register_node("mcl_furnaces:furnace_active", {
	description = "Furnace",
	tiles = {"default_furnace_top.png", "default_furnace_bottom.png", "default_furnace_side.png",
		"default_furnace_side.png", "default_furnace_side.png", "default_furnace_front_active.png"},
	paramtype2 = "facedir",
	is_ground_content = false,
	light_source = 13,
	drop = "mcl_furnaces:furnace",
	groups = {cracky=2, not_in_creative_inventory=1},
	sounds = mcl_core.node_sound_stone_defaults(),
	on_construct = function(pos)
		local meta = minetest.get_meta(pos)
		meta:set_string("formspec", furnace_inactive_formspec)
		local inv = meta:get_inventory()
		inv:set_size("fuel", 1)
		inv:set_size("src", 1)
		inv:set_size("dst", 1)
	end,
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for _, listname in ipairs({"src", "dst", "fuel"}) do
			local stack = inv:get_stack(listname, 1)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,
	allow_metadata_inventory_put = function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		if listname == "fuel" then
			if minetest.get_craft_result({method="fuel",width=1,items={stack}}).time ~= 0 then
				return stack:get_count()
			else
				return 0
			end
		elseif listname == "src" then
			return stack:get_count()
		elseif listname == "dst" then
			return 0
		end
	end,
	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
		local meta = minetest.get_meta(pos)
		local inv = meta:get_inventory()
		local stack = inv:get_stack(from_list, from_index)
		if to_list == "fuel" then
			if minetest.get_craft_result({method="fuel",width=1,items={stack}}).time ~= 0 then
				return count
			else
				return 0
			end
		elseif to_list == "src" then
			return count
		elseif to_list == "dst" then
			return 0
		end
	end,
	on_receive_fields = craftguide,
})

minetest.register_abm({
	nodenames = {"mcl_furnaces:furnace","mcl_furnaces:furnace_active"},
	interval = 1.0,
	chance = 1,
	action = function(pos, node, active_object_count, active_object_count_wider)
		local meta = minetest.get_meta(pos)
		for i, name in ipairs({
				"fuel_totaltime",
				"fuel_time",
				"src_totaltime",
				"src_time"
		}) do
			if meta:get_string(name) == "" then
				meta:set_float(name, 0.0)
			end
		end

		local inv = meta:get_inventory()

		local srclist = inv:get_list("src")
		local cooked = nil
		local aftercooked
		
		if srclist then
			cooked, aftercooked = minetest.get_craft_result({method = "cooking", width = 1, items = srclist})
		end
		
		local was_active = false
		
		if meta:get_float("fuel_time") < meta:get_float("fuel_totaltime") then
			was_active = true
			meta:set_float("fuel_time", meta:get_float("fuel_time") + 1)
			meta:set_float("src_time", meta:get_float("src_time") + 1)
			if cooked and cooked.item and meta:get_float("src_time") >= cooked.time then
				-- check if there's room for output in "dst" list
				if inv:room_for_item("dst",cooked.item) then
					-- Put result in "dst" list
					inv:add_item("dst", cooked.item)
					-- take stuff from "src" list
					inv:set_stack("src", 1, aftercooked.items[1])
				else
					print("Could not insert '"..cooked.item:to_string().."'")
				end
				meta:set_string("src_time", 0)
			end
		end
		
		if meta:get_float("fuel_time") < meta:get_float("fuel_totaltime") then
			local percent = math.floor(meta:get_float("fuel_time") /
					meta:get_float("fuel_totaltime") * 100)
			minetest.swap_node(pos, { name = "mcl_furnaces:furnace_active" })
			meta:set_string("formspec",
				"size[9,8.75]"..
				"background[-0.19,-0.25;9.41,9.49;crafting_formspec_bg.png^crafting_inventory_furnace.png]"..
				mcl_core.inventory_header..
				"list[current_player;main;0,4.5;9,3;9]"..
				"list[current_player;main;0,7.74;9,1;]"..
				"list[current_name;src;2.75,0.5;1,1;]"..
				"list[current_name;fuel;2.75,2.5;1,1;]"..
				"list[current_name;dst;5.75,1.5;1,1;]"..
				"image[2.75,1.5;1,1;default_furnace_fire_bg.png^[lowpart:"..
				(100-percent)..":default_furnace_fire_fg.png]"..
				"image_button[8,0;1,1;craftguide_book.png;__mcl_craftguide;]"..
				"tooltip[__mcl_craftguide;Show crafting recipes]"..
				"listring[current_name;dst]"..
				"listring[current_player;main]"..
				"listring[current_name;src]"..
				"listring[current_player;main]"..
				"listring[current_name;fuel]"..
				"listring[current_player;main]")
			return
		end

		local fuel = nil
		local afterfuel
		local cooked = nil
		local fuellist = inv:get_list("fuel")
		local srclist = inv:get_list("src")
		
		if srclist then
			cooked = minetest.get_craft_result({method = "cooking", width = 1, items = srclist})
		end
		if fuellist then
			fuel, afterfuel = minetest.get_craft_result({method = "fuel", width = 1, items = fuellist})
		end

		if fuel.time <= 0 then
			minetest.swap_node(pos, { name = "mcl_furnaces:furnace" })
			meta:set_string("formspec", furnace_inactive_formspec)
			return
		end

		if cooked.item:is_empty() then
			if was_active then
				minetest.swap_node(pos, { name = "mcl_furnaces:furnace" })
				meta:set_string("formspec", furnace_inactive_formspec)
			end
			return
		end

		meta:set_string("fuel_totaltime", fuel.time)
		meta:set_string("fuel_time", 0)
		
		inv:set_stack("fuel", 1, afterfuel.items[1])
	end,
})

minetest.register_craft({
	output = 'mcl_furnaces:furnace',
	recipe = {
		{'mcl_core:cobble', 'mcl_core:cobble', 'mcl_core:cobble'},
		{'mcl_core:cobble', '', 'mcl_core:cobble'},
		{'mcl_core:cobble', 'mcl_core:cobble', 'mcl_core:cobble'},
	}
})