Computer Craft: Direwolf20 9x9 House Builder

function digDown()
 if turtle.detectDown() == true then
  turtle.digDown()
 end
end

function digforward()
 if turtle.detect() == true then
  turtle.dig()
 end
end

function forward()
 digDown()
 digforward()
 turtle.placeDown()
 turtle.forward()
 sleep(0.5)
end

function line()
 for x=1,8 do
  forward()
 end
end

function startingpos()
 turtle.up()
 sleep(0.5)
 turtle.forward()
end

function layer()
 line()
 turtle.turnRight()
 line()
 turtle.turnRight()
 line()
 turtle.turnRight()
 line()
 turtle.turnRight()
end

function walls()
 turtle.select(1)
 layer()
 turtle.up()
 layer()
 turtle.up()
 turtle.select(2)
 layer()
 turtle.up()
 layer()
 turtle.up()
 turtle.select(3)
 layer()
end

function floorpos()
 turtle.forward()
 sleep(0.5)
 turtle.turnRight()
 sleep(0.5)
 turtle.forward()
 sleep(0.5)
 turtle.turnLeft()
 sleep(0.5)
 for x=1,5 do
  turtle.down()
  sleep(0.5)
 end
end

function floorline()
 for x=1,6 do
  digDown()
  turtle.placeDown()
  turtle.forward()
  sleep(0.5)
 end
end

function right()
 turtle.turnRight()
 digDown()
 turtle.placeDown()
 sleep(0.5)
 turtle.forward()
 sleep(0.5)
 turtle.turnRight()
 sleep(0.5)
end

function left()
 turtle.turnLeft()
 digDown()
 turtle.placeDown()
 sleep(0.5)
 turtle.forward()
 sleep(0.5)
 turtle.turnLeft()
 sleep(0.5)
end

function floor()
 turtle.select(4)
 floorline()
 right()
 floorline()
 left()
 floorline()
 right()
 floorline()
 left()
 floorline()
 right()
 floorline()
 left()
 floorline()
end

function roofpos()
 digDown()
 turtle.placeDown()
 turtle.turnRight()
 sleep(0.5)
 turtle.turnRight()
 sleep(0.5)
 for x=1,5 do
  turtle.up()
  sleep(0.5)
 end
end

function rooflineglass()
  turtle.select(5)
  digDown()
  turtle.placeDown()
  turtle.forward()
  sleep(0.5)
  turtle.select(6)
  digDown()
  turtle.placeDown()
  turtle.forward()
  turtle.select(6)
  digDown()
  turtle.placeDown()
  turtle.forward()
  sleep(0.5)
  turtle.select(5)
  digDown()
  turtle.placeDown()
  turtle.forward()
  turtle.select(6)
  digDown()
  turtle.placeDown()
  turtle.forward()
  sleep(0.5)
  turtle.select(6)
  digDown()
  turtle.placeDown()
  turtle.forward()
  sleep(0.5)
  turtle.select(5)
  digDown()
  turtle.placeDown()
end

function roofline()
 for x=1,6 do
  turtle.select(5)
  digDown()
  turtle.placeDown()
  turtle.forward()
  sleep(0.5)
 end
end

function roof()
 roofline()
 right()
 rooflineglass()
 left()
 rooflineglass()
 right()
 roofline()
 left()
 rooflineglass()
 right()
 rooflineglass()
 left()
 roofline()
end

function checkwalls()
 if turtle.getItemCount(1) < 64 then
  print("Not Enough Blocks In Slot 1")
  shell.exit()
 end

 if turtle.getItemCount(2) < 64 then
  print("Not Enough Blocks In Slot 2")
  shell.exit()
 end

 if turtle.getItemCount(3) < 32 then
  print("Not Enough Blocks In Slot 3")
  shell.exit()
 end
end

function checkfloor()
 if turtle.getItemCount(4) < 49 then
  print("Not Enought Blocks In SLot 4")
  shell.exit()
 end
end

function checkroof()
 if turtle.getItemCount(5) < 33 then
  print("Not Enough Blocks In Slot 5")
  shell.exit()
 end
end

function checkskylights()
 if turtle.getItemCount(6) < 16 then
  print("Not Enought Blocks In Slot 6")
  shell.exit()
 end
end

function checkblockcount()
 checkwalls()
 checkfloor()
 checkroof()
 checkskylights()
end

function gohome()
 digDown()
 turtle.placedown()
 turtle.forward()
 sleep(0.5)
 turtle.turnRight()
 sleep(0.5)
 turtle.forward()
 sleep(0.5)
 turtle.turnLeft()
 sleep(0.5)
 turtle.forward()
 sleep(0.5)
 for x=1,5 do
  turtle.down()
 end
 print("9x9 Complete!")
end

print("Welcome to norway240's Direwolf20 9x9 house builder!")
print("Walls = slots 1,2,3 (2.5 stacks)")
print("Floor = slot 4 (49 blocks)")
print("Roof = slot 5 (33 blocks)")
print("Skylights = 6 (16 blocks)")

checkblockcount()

startingpos()
walls()
floorpos()
floor()
roofpos()
roof()
gohome()