View difference between Paste ID: z1awRRpn and A4MYU7JF

-local l,w,h = ... -- 50, 40, 5
+local l,w,h = ...
-local function build_col(h)
+local function slot_plus() turtle.select(turtle.getSelectedSlot()%16+1) end
-    for ih=1,h do
+local function build_line(n)
     for i=1,n do
-        turtle.placeDown()
+        if not turtle.placeDown() then
-        if turtle.getItemCount()==0 then
+			slot_plus()
-            turtle.select(turtle.getSelectedSlot()+1)
+			turtle.placeDown()
-        end
+		end
         while not turtle.getItemCount() do slot_plus() end
-    turtle.forward()
+        turtle.forward()
-    while turtle.down() do end
+
 end
-local function build_wall(n,h)
+local function build_layer(l,w)
     build_line(l-1)
-        build_col(h)
+    turtle.turnLeft()
     build_line(w-1)
     turtle.turnLeft()
---[[
+    build_line(l-1)
-build_wall(l-1)
+    turtle.turnLeft()
-turtle.turnLeft()
+    build_line(w-1)
-turtle.back()
+    turtle.turnLeft()
-build_wall(w-1)
+
-turtle.turnLeft()
+local function build_wall(l,w,h)
-turtle.back()
+    for i=1,h do
-build_wall(l-1)
+
-turtle.turnLeft()
+        build_layer(l,w)
-turtle.back()
+
-build_wall(w)]]
+
-return {build_wall=build_wall}
+
 if not l then
     error("Must have three arguments: length, width and height.")
 end
 if tonumber(l) and tonumber(w) and tonumber(h) then
     build_wall(l,w,h)
 end
 return {build=build_wall}