diff --git a/autocrafter.lua b/autocrafter.lua
index 070b3de..b2e50c1 100644
--- a/autocrafter.lua
+++ b/autocrafter.lua
@@ -49,7 +49,6 @@ local function autocraft(inventory, pos)
 		end
 	end
 
-	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
diff --git a/autoplace_tubes.lua b/autoplace_tubes.lua
index 0c648e1..dfac997 100644
--- a/autoplace_tubes.lua
+++ b/autoplace_tubes.lua
@@ -12,7 +12,7 @@ local function is_tube(nodename)
 end
 
 if pipeworks == nil then
-    pipeworks = {}
+	pipeworks = {}
 end
 
 --a function for determining which side of the node we are on
@@ -23,105 +23,100 @@ local function nodeside(node, tubedir)
 		return "back"
 	end
 
-    --get a vector pointing back
-    local backdir = minetest.facedir_to_dir(node.param2)
+	--get a vector pointing back
+	local backdir = minetest.facedir_to_dir(node.param2)
 
-    --check whether the vector is equivalent to the tube direction; if it is, the tube's on the backside
-    if backdir.x == tubedir.x and backdir.y == tubedir.y and backdir.z == tubedir.z then
-        return "back"
-    end
+	--check whether the vector is equivalent to the tube direction; if it is, the tube's on the backside
+	if backdir.x == tubedir.x and backdir.y == tubedir.y and backdir.z == tubedir.z then
+		return "back"
+	end
 
-    --check whether the vector is antiparallel with the tube direction; that indicates the front
-    if backdir.x == -tubedir.x and backdir.y == -tubedir.y and backdir.z == -tubedir.z then
-        return "front"
-    end
+	--check whether the vector is antiparallel with the tube direction; that indicates the front
+	if backdir.x == -tubedir.x and backdir.y == -tubedir.y and backdir.z == -tubedir.z then
+		return "front"
+	end
 
-    --facedir is defined in terms of the top-bottom axis of the node; we'll take advantage of that
-    local topdir = ({[0]={x=0, y=1, z=0},
-    {x=0, y=0, z=1},
-    {x=0, y=0, z=-1},
-    {x=1, y=0, z=0},
-    {x=-1, y=0, z=0},
-    {x=0, y=-1, z=0}})[math.floor(node.param2/4)]
+	--facedir is defined in terms of the top-bottom axis of the node; we'll take advantage of that
+	local topdir = ({[0]={x=0, y=1, z=0},
+	{x=0, y=0, z=1},
+	{x=0, y=0, z=-1},
+	{x=1, y=0, z=0},
+	{x=-1, y=0, z=0},
+	{x=0, y=-1, z=0}})[math.floor(node.param2/4)]
 
-    --is this the top?
-    if topdir.x == tubedir.x and topdir.y == tubedir.y and topdir.z == tubedir.z then
-        return "top"
-    end
+	--is this the top?
+	if topdir.x == tubedir.x and topdir.y == tubedir.y and topdir.z == tubedir.z then
+		return "top"
+	end
 
-    --or the bottom?
-    if topdir.x == -tubedir.x and topdir.y == -tubedir.y and topdir.z == -tubedir.z then
-        return "bottom"
-    end
+	--or the bottom?
+	if topdir.x == -tubedir.x and topdir.y == -tubedir.y and topdir.z == -tubedir.z then
+		return "bottom"
+	end
 
-    --we shall apply some maths to obtain the right-facing vector
-    local rightdir = {x=topdir.y*backdir.z - backdir.y*topdir.z,
-    y=topdir.z*backdir.x - backdir.z*topdir.x,
-    z=topdir.x*backdir.y - backdir.x*topdir.y}
+	--we shall apply some maths to obtain the right-facing vector
+	local rightdir = {x=topdir.y*backdir.z - backdir.y*topdir.z,
+	y=topdir.z*backdir.x - backdir.z*topdir.x,
+	z=topdir.x*backdir.y - backdir.x*topdir.y}
 
-    --is this the right side?
-    if rightdir.x == tubedir.x and rightdir.y == tubedir.y and rightdir.z == tubedir.z then
-        return "right"
-    end
+	--is this the right side?
+	if rightdir.x == tubedir.x and rightdir.y == tubedir.y and rightdir.z == tubedir.z then
+		return "right"
+	end
 
-    --or the left?
-    if rightdir.x == -tubedir.x and rightdir.y == -tubedir.y and rightdir.z == -tubedir.z then
-        return "left"
-    end
+	--or the left?
+	if rightdir.x == -tubedir.x and rightdir.y == -tubedir.y and rightdir.z == -tubedir.z then
+		return "left"
+	end
 
-    --we should be done by now; initiate panic mode
-    minetest.log("error", "nodeside has been confused by its parameters; see pipeworks autoplace_tubes.lua, line 78")
+	--we should be done by now; initiate panic mode
+	minetest.log("error", "nodeside has been confused by its parameters; see pipeworks autoplace_tubes.lua, line 78")
 end
 
 local function tube_autoroute(pos)
 	local active = {0, 0, 0, 0, 0, 0}
-    local nctr = minetest.get_node(pos)
-    if not is_tube(nctr.name) then return end
+	local nctr = minetest.get_node(pos)
+	if not is_tube(nctr.name) then return end
 
-    local adjustments = {
-        { x=-1, y=0, z=0 },
-        { x=1, y=0, z=0  },
-        { x=0, y=-1, z=0 },
-        { x=0, y=1, z=0  },
-        { x=0, y=0, z=-1 },
-        { x=0, y=0, z=1 }
-    }
-    -- xm = 1, xp = 2, ym = 3, yp = 4, zm = 5, zp = 6
+	local adjustments = {
+		{ x=-1, y=0, z=0 },
+		{ x=1, y=0, z=0  },
+		{ x=0, y=-1, z=0 },
+		{ x=0, y=1, z=0  },
+		{ x=0, y=0, z=-1 },
+		{ x=0, y=0, z=1 }
+	}
+	-- xm = 1, xp = 2, ym = 3, yp = 4, zm = 5, zp = 6
 
-    local positions = {}
-    local nodes = {}
-    for i,adj in ipairs(adjustments) do
-        positions[i] = {x=pos.x+adj.x, y=pos.y+adj.y, z=pos.z+adj.z}
-        nodes[i] = minetest.get_node(positions[i])
-    end
+	local positions = {}
+	local nodes = {}
+	for i,adj in ipairs(adjustments) do
+		positions[i] = {x=pos.x+adj.x, y=pos.y+adj.y, z=pos.z+adj.z}
+		nodes[i] = minetest.get_node(positions[i])
+	end
 
-    for i,node in ipairs(nodes) do
-        local idef = minetest.registered_nodes[node.name]
-        -- handle the tubes themselves
-        if is_tube(node.name) then
-            active[i] = 1
-        -- handle new style connectors
-        elseif idef.tube and idef.tube.connect_sides then
-            local dir = adjustments[i]
-            if idef.tube.connect_sides[nodeside(node, {x=-dir.x, y=-dir.y, z=-dir.z})] then active[i] = 1 end
-        end
-    end
+	for i,node in ipairs(nodes) do
+		local idef = minetest.registered_nodes[node.name]
+		-- handle the tubes themselves
+		if is_tube(node.name) then
+			active[i] = 1
+		-- handle new style connectors
+		elseif idef.tube and idef.tube.connect_sides then
+			local dir = adjustments[i]
+			if idef.tube.connect_sides[nodeside(node, {x=-dir.x, y=-dir.y, z=-dir.z})] then active[i] = 1 end
+		end
+	end
 
-    -- all sides checked, now figure which tube to use.
+	-- all sides checked, now figure which tube to use.
 
 	local nsurround = ""
 	for i,n in ipairs(active) do
 		nsurround = nsurround .. n
 	end
-	local newname=string.sub(nctr.name,1,-7)..nsurround
+	local newname = string.sub(nctr.name, 1, -7)..nsurround
 	if newname == nctr.name then return end
-	local meta=minetest.get_meta(pos)
-	local meta0=meta:to_table() -- XXX: hacky_swap_node
 	nctr.name = newname
-	minetest.add_node(pos, nctr)
-	local meta=minetest.get_meta(pos)
-	meta:from_table(meta0)
-	local nctr = minetest.get_node(pos)
+	minetest.swap_node(pos, nctr)
 end
 
 function pipeworks.scan_for_tube_objects(pos)
diff --git a/compat.lua b/compat.lua
index 3bf7d98..6918814 100644
--- a/compat.lua
+++ b/compat.lua
@@ -1,114 +1,117 @@
 -- this bit of code modifies the default chests and furnaces to be compatible
 -- with pipeworks.
 
-function pipeworks:clone_node(name)
-	local node2={}
-	local node=minetest.registered_nodes[name]
-	for k,v in pairs(node) do
-		node2[k]=v
+function pipeworks.clone_node(name)
+	local node2 = {}
+	local node = minetest.registered_nodes[name]
+	for k, v in pairs(node) do
+		node2[k] = v
 	end
 	return node2
 end
 
-local furnace=pipeworks:clone_node("default:furnace")
+local furnace = pipeworks.clone_node("default:furnace")
 	furnace.tiles[2] = "default_furnace_bottom.png^pipeworks_tube_connection_stony.png"
 	furnace.tiles[3] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
 	furnace.tiles[4] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
 	furnace.tiles[5] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
-		-- note we don't redefine entries 1 and 6 (top and front)
-	furnace.groups.tubedevice=1
-	furnace.groups.tubedevice_receiver=1
-	furnace.tube={insert_object = function(pos,node,stack,direction)
-			local meta=minetest.get_meta(pos)
-			local inv=meta:get_inventory()
-			if direction.y==1 then
+	-- note we don't redefine entries 1 and 6 (top and front)
+	furnace.groups.tubedevice = 1
+	furnace.groups.tubedevice_receiver = 1
+	furnace.tube = {
+		insert_object = function(pos, node, stack, direction)
+			local meta = minetest.get_meta(pos)
+			local inv = meta:get_inventory()
+			if direction.y == 1 then
 				return inv:add_item("fuel",stack)
 			else
 				return inv:add_item("src",stack)
 			end
 		end,
-	can_insert=function(pos,node,stack,direction)
-		local meta=minetest.get_meta(pos)
-		local inv=meta:get_inventory()
-		if direction.y==1 then
-			return inv:room_for_item("fuel",stack)
-		elseif direction.y==-1 then
-			return inv:room_for_item("src",stack)
-		else
-			return 0
-	end
-	end,
-	input_inventory="dst",
-	connect_sides={left=1, right=1, back=1, bottom=1}}
-	furnace.after_place_node= function(pos)
+		can_insert = function(pos,node,stack,direction)
+			local meta = minetest.get_meta(pos)
+			local inv = meta:get_inventory()
+			if direction.y == 1 then
+				return inv:room_for_item("fuel", stack)
+			else
+				return inv:room_for_item("src", stack)
+			end
+		end,
+		input_inventory = "dst",
+		connect_sides = {left=1, right=1, back=1, bottom=1, front=1, top=1}
+	}
+	furnace.after_place_node = function(pos)
 		pipeworks.scan_for_tube_objects(pos)
 	end
 	furnace.after_dig_node = function(pos)
 		pipeworks.scan_for_tube_objects(pos)
 	end
 
-minetest.register_node(":default:furnace",furnace)
+minetest.register_node(":default:furnace", furnace)
 
-local furnace=pipeworks:clone_node("default:furnace_active")
-	furnace.tiles[2] = "default_furnace_bottom.png^pipeworks_tube_connection_stony.png"
-	furnace.tiles[3] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
-	furnace.tiles[4] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
-	furnace.tiles[5] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
-		-- note we don't redefine entries 1 and 6 (top and front)
-	furnace.groups.tubedevice=1
-	furnace.groups.tubedevice_receiver=1
-	furnace.tube={insert_object=function(pos,node,stack,direction)
-		local meta=minetest.get_meta(pos)
-		local inv=meta:get_inventory()
-		if direction.y==1 then
-			return inv:add_item("fuel",stack)
-		else
-			return inv:add_item("src",stack)
-		end
-	end,
-	can_insert=function(pos,node,stack,direction)
-		local meta=minetest.get_meta(pos)
-		local inv=meta:get_inventory()
-		if direction.y==1 then
-			return inv:room_for_item("fuel",stack)
-		elseif direction.y==-1 then
-			return inv:room_for_item("src",stack)
-		else
-			return 0
-		end
-	end,
-	input_inventory="dst",
-	connect_sides={left=1, right=1, back=1, bottom=1}}
-	furnace.after_place_node= function(pos)
+local furnace_active = pipeworks.clone_node("default:furnace_active")
+	furnace_active.tiles[2] = "default_furnace_bottom.png^pipeworks_tube_connection_stony.png"
+	furnace_active.tiles[3] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
+	furnace_active.tiles[4] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
+	furnace_active.tiles[5] = "default_furnace_side.png^pipeworks_tube_connection_stony.png"
+	-- note we don't redefine entries 1 and 6 (top and front)
+	furnace_active.groups.tubedevice = 1
+	furnace_active.groups.tubedevice_receiver = 1
+	furnace_active.tube = {
+		insert_object = function(pos,node,stack,direction)
+			local meta = minetest.get_meta(pos)
+			local inv = meta:get_inventory()
+			if direction.y == 1 then
+				return inv:add_item("fuel", stack)
+			else
+				return inv:add_item("src", stack)
+			end
+		end,
+		can_insert = function(pos, node, stack, direction)
+			local meta = minetest.get_meta(pos)
+			local inv = meta:get_inventory()
+			if direction.y == 1 then
+				return inv:room_for_item("fuel", stack)
+			else
+				return inv:room_for_item("src", stack)
+			end
+		end,
+		input_inventory = "dst",
+		connect_sides = {left=1, right=1, back=1, bottom=1, front=1, top=1}
+	}
+	furnace_active.after_place_node= function(pos)
 		pipeworks.scan_for_tube_objects(pos)
 	end
-	furnace.after_dig_node = function(pos)
+	furnace_active.after_dig_node = function(pos)
 		pipeworks.scan_for_tube_objects(pos)
 	end
-	minetest.register_node(":default:furnace_active",furnace)
+
+minetest.register_node(":default:furnace_active", furnace_active)
 
 
-local chest=pipeworks:clone_node("default:chest")
+local chest = pipeworks.clone_node("default:chest")
 	chest.tiles[1] = "default_chest_top.png^pipeworks_tube_connection_wooden.png"
 	chest.tiles[2] = "default_chest_top.png^pipeworks_tube_connection_wooden.png"
 	chest.tiles[3] = "default_chest_side.png^pipeworks_tube_connection_wooden.png"
 	chest.tiles[4] = "default_chest_side.png^pipeworks_tube_connection_wooden.png"
 	chest.tiles[5] = "default_chest_side.png^pipeworks_tube_connection_wooden.png"
-		-- note we don't redefine entry 6 (front).
-	chest.groups.tubedevice=1
-	chest.groups.tubedevice_receiver=1
-	chest.tube={insert_object = function(pos,node,stack,direction)
-		local meta=minetest.get_meta(pos)
-		local inv=meta:get_inventory()
-		return inv:add_item("main",stack)
-	end,
-	can_insert=function(pos,node,stack,direction)
-		local meta=minetest.get_meta(pos)
-		local inv=meta:get_inventory()
-		return inv:room_for_item("main",stack)
-	end,
-	input_inventory="main",
-	connect_sides={left=1, right=1, back=1, bottom=1, top=1}}
+	-- note we don't redefine entry 6 (front).
+	chest.groups.tubedevice = 1
+	chest.groups.tubedevice_receiver = 1
+	chest.tube = {
+		insert_object = function(pos, node, stack, direction)
+			local meta = minetest.get_meta(pos)
+			local inv = meta:get_inventory()
+			return inv:add_item("main", stack)
+		end,
+		can_insert = function(pos, node, stack, direction)
+			local meta = minetest.get_meta(pos)
+			local inv = meta:get_inventory()
+			return inv:room_for_item("main", stack)
+		end,
+		input_inventory = "main",
+		connect_sides = {left=1, right=1, back=1, bottom=1, top=1, front=1}
+	}
 	chest.after_place_node = function(pos)
 		pipeworks.scan_for_tube_objects(pos)
 	end
@@ -116,36 +119,38 @@ local chest=pipeworks:clone_node("default:chest")
 		pipeworks.scan_for_tube_objects(pos)
 	end
 
-minetest.register_node(":default:chest",chest)
+minetest.register_node(":default:chest", chest)
 
 
-local chest_locked=pipeworks:clone_node("default:chest_locked")
+local chest_locked = pipeworks.clone_node("default:chest_locked")
 	chest_locked.tiles[1] = "default_chest_top.png^pipeworks_tube_connection_wooden.png"
 	chest_locked.tiles[2] = "default_chest_top.png^pipeworks_tube_connection_wooden.png"
 	chest_locked.tiles[3] = "default_chest_side.png^pipeworks_tube_connection_wooden.png"
 	chest_locked.tiles[4] = "default_chest_side.png^pipeworks_tube_connection_wooden.png"
 	chest_locked.tiles[5] = "default_chest_side.png^pipeworks_tube_connection_wooden.png"
-		-- note we don't redefine entry 6 (front).
-	chest_locked.groups.tubedevice=1
-	chest_locked.groups.tubedevice_receiver=1
-	chest_locked.tube={insert_object = function(pos,node,stack,direction)
-		local meta=minetest.env:get_meta(pos)
-		local inv=meta:get_inventory()
-		return inv:add_item("main",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("main",stack)
-	end,
-	connect_sides={left=1, right=1, back=1, bottom=1, top=1}}
-  local old_after_place = minetest.registered_nodes["default:chest_locked"].after_place_node;
+	-- note we don't redefine entry 6 (front).
+	chest_locked.groups.tubedevice = 1
+	chest_locked.groups.tubedevice_receiver = 1
+	chest_locked.tube = {
+		insert_object = function(pos, node, stack, direction)
+			local meta = minetest.env:get_meta(pos)
+			local inv = meta:get_inventory()
+			return inv:add_item("main", 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("main", stack)
+		end,
+		connect_sides = {left=1, right=1, back=1, bottom=1, top=1, front=1}
+	}
+	local old_after_place = minetest.registered_nodes["default:chest_locked"].after_place_node
 	chest_locked.after_place_node = function(pos, placer)
 		pipeworks.scan_for_tube_objects(pos)
-    old_after_place(pos, placer)
+		old_after_place(pos, placer)
 	end
 	chest_locked.after_dig_node = function(pos)
 		pipeworks.scan_for_tube_objects(pos)
 	end
 
-minetest.register_node(":default:chest_locked",chest_locked)
+minetest.register_node(":default:chest_locked", chest_locked)
diff --git a/flowing_logic.lua b/flowing_logic.lua
index 6b5d30f..e0a6236 100644
--- a/flowing_logic.lua
+++ b/flowing_logic.lua
@@ -39,7 +39,7 @@ pipeworks.check_for_inflows = function(pos,node)
 		local name = minetest.get_node(coords[i]).name
 		if name and (name == "pipeworks:pump_on" and pipeworks.check_for_liquids(coords[i])) or string.find(name,"_loaded") then
 			if string.find(name,"_loaded") then
-				local source = minetest.get_meta(coords[i]):get_string("source")
+				source = minetest.get_meta(coords[i]):get_string("source")
 				if source == minetest.pos_to_string(pos) then break end
 			end
 			newnode = string.gsub(node.name,"empty","loaded")