distil.lua

local function always_return(v)
	return function()
		return v
	end
end

local burner_can_put_liquid = always_return(true)

local MAX_LEVEL = 1000

local function burner_room(pos, node, side, liquid, millibuckets)
	print("======= ROOM =======")
	print(dump({pos, node, side, liquid, millibuckets}))
	print("======= END ROOM =======")
	if liquid ~= "oil:crude" then
		minetest.log("error", "Attempt to put non-crude liquid into burner!")
		return true
	end

	local meta = minetest.get_meta(pos)
	return meta:get_int("level") + millibuckets < MAX_LEVEL
end

local function burner_put_liquid(pos, node, side, putter, liquid, millibuckets)
	print("======= PUT LIQUID =======")
	print(dump({pos, node, side, putter, liquid, millibuckets}))
	print("======= END PUT LIQUID =======")

	local meta = minetest.get_meta(pos)
	local level = meta:get_int("level")
	local to_add = millibuckets
	if level + to_add > MAX_LEVEL then
		to_add = MAX_LEVEL - level
	end
	meta:set_int("level", level + to_add)
	meta:set_string("infotext", level .. " / 1000")
	return millibuckets - to_add
end

minetest.register_node("oil:burner", {
	description = "Burner",
	tiles = { "oil_burner_off.png"},
	groups = { fluid_container = 1 },
	paramtype2 = "facedir",
	after_place_node = node_io.update_neighbors,
	after_dig_node = node_io.update_neighbors,
	node_io_can_put_liquid = burner_can_put_liquid,
	node_io_accepts_millibuckets = always_return(true),
	node_io_room_for_liquid = always_return(false),
	node_io_get_liquid_size = always_return(0),
	node_io_get_liquid_name = always_return(nil),
	node_io_get_liquid_stack = always_return(nil),
})

minetest.register_node("oil:burner_active", {
	description = "Active Burner",
	tiles = { "oil_burner_on.png"},
	groups = { fluid_container = 1 },
	light_source = 8,
	paramtype2 = "facedir",
	after_place_node = node_io.update_neighbors,
	after_dig_node = node_io.update_neighbors,
	node_io_can_put_liquid = burner_can_put_liquid,
	node_io_put_liquid = burner_put_liquid,
	node_io_accepts_millibuckets = always_return(true),
	node_io_room_for_liquid = burner_room,
	node_io_get_liquid_size = always_return(1),
	node_io_get_liquid_name = always_return("oil:crude"),
	node_io_get_liquid_stack = always_return(ItemStack("oil:crude 10")),
})