View difference between Paste ID: 3UxnQf57 and fEZSwJja

--- walls
+-- structure
--- Puts up walls to the length, width, height specified
+-- Puts up walls and roof to the length, width, height specified
 -- Turtle returns to its starting point when mission is completed or fuel runs low
--- Written by HarvDad, March 2014
+-- Written by HarvDad, November 2019
 
 args = {...}
 nArgs = #args
 
-version = "walls: Rev 1.0"
+version = "structure: Rev 1.0"
-mission = "Put walls to the length, width, height specified"
+mission = "Put walls and roof to the length, width, height specified"
-instructions = "Place stack(s) of material starting in first slot."
+instructions = "Place stack(s) of wall material starting in first slot, roof material slot 9."
 
-usage = "walls <length> <width> <height>"
+usage = "structure <length> <width> <height>"
 
 x = 0
 y = 0
 z = 0
 face = 0
 minimumFuel = 100
 missionMessage = "Mission complete."
 abort = false
 startLevel = 0
 local currentFuelLevel = turtle.getFuelLevel()
 areaCovered = 0
 
 if nArgs == 0 or (nArgs == 1 and args[1]== "help") then
 	print(version)
 	print(mission)
 	print(instructions)
 	print(usage)
 	return
 end
 
 if nArgs ~= 3 then
   print(usage)
   return
 end
 
 length = tonumber(args[1])
 if length == nil then
   print("\"", args[1], "\" is not a valid length")
   return
 end
 if length < 1 then
   print("length must be a positive number greater than zero")
 end
 
 width = tonumber(args[2])
 if width == nil then
   print("\"", args[2], "\" is not a valid width")
   return
 end
 if width < 1 then
   print("width must be a positive number greater than zero")
 end
 
 height = tonumber(args[3])
 if startLevel == nil then
   print("\"", args[3], "\" is not a valid height")
 return
 end
 
 currentSlot = 2
-materialSlot = 1
+wallSlot = 1
 roofSlot = 9
 maxSlot = 16
 
 nextTurn = "left"
 
 local clock = os.clock
 function sleep(n)  -- seconds
   local t0 = clock()
     while clock() - t0 <= n do end
 end
 
 function left()
  if face == 0 then face = 1 turtle.turnLeft() return end
  if face == 1 then face = 2 turtle.turnLeft() return end
  if face == 2 then face = 3 turtle.turnLeft() return end
  if face == 3 then face = 0 turtle.turnLeft() return end
  print("function left\(\): Bad face value: ", face)
 end
 
 function right()
  if face == 0 then face = 3 turtle.turnRight() return end
  if face == 1 then face = 0 turtle.turnRight() return end
  if face == 2 then face = 1 turtle.turnRight() return end
  if face == 3 then face = 2 turtle.turnRight() return end
  print("function right\(\): Bad face value: ", face)
 end
 
 function up()
   turtle.up()
   y = y+1
 end
 
 function rise(nBlocks)
   local i
   for i=1,nBlocks do
     up()
   end
 end
 
 function down()
   if turtle.detectDown() then
     turtle.digDown()
   end
   turtle.down()
   y = y-1
 end
 
 function turn()
   if nextTurn == "left" then
     left()
   else
     right()
   end
   chomp()
   forward()
   if nextTurn == "left" then
 	left()
   	nextTurn = "right"
   else
 	right()
     nextTurn = "left"
   end
   areaCovered = areaCovered + 1
 end
 
 function forward()
 	while turtle.detect() do	-- This loop added in case of falling sand or whatever
 	  turtle.dig()
 	end
 	for i=1,10 do				-- This loop trys to handle pests (mob) that might be in the way
 		if turtle.forward() then
 			break
 		end
 		turtle.attack()
 		sleep(2)
 	end
 	areaCovered = areaCovered + 1
 
   	if face == 0 then z = z+1 return end
   	if face == 1 then x = x-1 return end
   	if face == 2 then z = z-1 return end
   	if face == 3 then x = x+1 return end
 end
 
 function setFace(f)
 	if f == 0 then
 	  if face == 0 then return end
 	  if face == 1 then right() return end
 	  if face == 2 then right() right() return end
 	  if face == 3 then left() return end
 	end
 
 	if f == 1 then
 	  if face == 0 then left() return end
 	  if face == 1 then return end
 	  if face == 2 then right() return end
 	  if face == 3 then right() right() return end
 	end
 
 	if f == 2 then
 	  if face == 0 then left() left() return end
 	  if face == 1 then left() return end
 	  if face == 2 then return end
 	  if face == 3 then right() return end
 	end
 
 	if f == 3 then
 	  if face == 0 then right() return end
 	  if face == 1 then left() left() return end
 	  if face == 2 then left() return end
 	  if face == 3 then return end
 	end
 end
 
 function home(targetY)
 --  print("home:face ", face, ", x = ", x, ", z = ", z)
   if x < 0 then
 	setFace(3)
 	while x < 0 do
 	  forward()
 	end
   else
     if x > 0 then
   	  setFace(1)
 	  while x > 0 do
 	    forward()
 	  end
     end
   end
 
   if z < 0 then
 	setFace(0)
 	while z < 0 do
 	  forward()
 	end
   else
     if z > 0 then
   	  setFace(2)
 	  while z > 0 do
 	    forward()
 	  end
     end
   end
 
   if y > 0 then
   	while y > 0 do
 		down()
 	end
   end
 
   setFace(0)
 end
 
-	if turtle.getItemCount(materialSlot) < 3 then
+
 	if turtle.getItemCount(wallSlot) < 3 then
 		organizeMaterial()
-	if turtle.getItemCount(materialSlot) < 3 then
+
 	if turtle.getItemCount(wallSlot) < 3 then
 		print("No more material")
 		return false
 	end
 	return true
 end
 
 function organizeMaterial()
-	materialCount = turtle.getItemCount(materialSlot)
+
 	materialCount = turtle.getItemCount(wallSlot)
 
---		print("Attempting to refill slot ", materialSlot)
+
 --		print("Attempting to refill slot ", wallSlot)
 		for i=2,16 do
-			if turtle.compareTo(materialSlot) then
+
-				turtle.transferTo(materialSlot)
+			if turtle.compareTo(wallSlot) then
 				turtle.transferTo(wallSlot)
 			end
 		end
-	turtle.select(materialSlot)
+
 	turtle.select(wallSlot)
 end
 
-	turtle.select(materialSlot)
+
 	turtle.select(wallSlot)
 
 	if startLevel > 2 then
 		if turtle.detectUp() then
 			if turtle.compareUp() then
 				return
 			else
 				turtle.digUp()
 			end
 		end
 		if ensureMaterial() then
 			turtle.placeUp()
 		end
 	else
 		if turtle.detectDown() then
 			if turtle.compareDown() then
 				return
 			else
 				turtle.digDown()
 			end
 		end
 		if ensureMaterial() then
 			turtle.placeDown()
 		end
 	end
 end
 
 function checkFuel()
 	if currentFuelLevel == "unlimited" then
 		return true
 	end
 
 	if currentFuelLevel < minimumFuel then
 	  if not turtle.refuel() then
 		  areaCovered = targetArea
 		  missionMessage = "Mission aborted due to low fuel."
 		  abort = true
 	    return false
 	  end
 	end
   return true
 end
 
 currentSlot = 1
 
 --[[
 function layRow(nBlocks)
 	turtle.select(currentSlot)
 
 	for i=1,nBlocks do
 		if turtle.getItemCount(currentSlot) > 0 then
 			turtle.placeDown()
 			turtle.forward()
 		else
 			currentSlot = currentSlot + 1
 			if turtle.getItemCount(currentSlot) > 0 then
 				turtle.select(currentSlot)
 				turtle.placeDown()
 				turtle.forward()
 			else
 				print("Can't find more material")
 				return
 			end
 		end
 	end
 end
 --]]
 
-	turtle.select(materialSlot)
+
 	turtle.select(wallSlot)
 	for i=1,nBlocks do
 		if ensureMaterial() then
 			turtle.placeDown()
 			turtle.forward()
 		else
 			if ensureMaterial() then
 				turtle.placeDown()
 				turtle.forward()
 			else
 				print("Can't find more material")
 				return
 			end
 		end
 	end
 end
 
 -- MAIN PROGRAM
 
 turtle.select(1)
 
 print("fuelLevel = ", currentFuelLevel)
 print("length = ", length)
 print("width = ", width)
 print("face = ", face)
 
 print("Current Fuel Level: ", currentFuelLevel)
 
 if currentFuelLevel ~= "unlimited" then
 	if currentFuelLevel < minimumFuel then
 		if not turtle.refuel() then
 		  print("No fuel")
 		  return
 		end
 	end
 end
 
 notFinished = true
 
 while notFinished do
 	if y == height then
 		notFinished = false
 		break
 	end
 	up()
 
 	setFace(0)
 	layRow(length - 1)
 
 	setFace(1)
 	layRow(width - 1)
 
 	setFace(2)
 	layRow(length - 1)
 
 	setFace(3)
 	layRow(width - 1)
 end
 
 setFace(0)
 turtle.back()
 z = z - 1
 while y > 0 do
 	turtle.down()
 	y = y - 1
 end
 print(missionMessage)
 print(" Current fuel level is ", turtle.getFuelLevel())