ComputerCraft Code: Level

--[[ l= rectange length, w is width, and h is height]]--
l=35
w=45
h=9

--[[variable]]--
x=0
y=0
z=0

i=0

--[[functions]]--

function refuel()
  if turtle.getFuelLevel() < 34 then
  turtle.refuel(1)
  end
print("refueling")
print("fuel level is")
print(turtle.getFuelLevel())
end

function length()
refuel()
  while x < l do
  turtle.dig()
  turtle.digUp()
  turtle.digDown()
  turtle.select(2)
    while turtle.compare() do
    turtle.dig()
    end
  turtle.forward()
  turtle.digDown()
  turtle.digUp()
  x = x+1
  end
x = 0
end

function nextRight()
refuel()
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.turnRight()
turtle.digUp()
turtle.digDown()
end

function nextLeft()
refuel()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.turnLeft()
turtle.digUp()
turtle.digDown()
end

function width()
refuel()
  while y < w do
    length()
    i= i+1
    if i%2==0 then
    nextRight()
    else
    nextLeft()
    end
  y = y+1
  end
y = 0
end

function reset()
refuel()
turtle.turnRight()
turtle.turnRight()
  while x < l do
  refuel()
  turtle.forward()
  x = x+1
  end
x = 0
turtle.turnLeft()
  while x < l do
  refuel()
  turtle.forward()
  x = x+1
  end
x = 0
end

function uplvl()
refuel()
  if z < h then
  reset()
  turtle.up()
  turtle.digUp()
  turtle.up()
  turtle.digUp()
  turtle.up()
  z = z+3
  end
end

function all()
  while z < h do
  refuel()
  width()
  uplvl()
  end
    if z >= h then
    reset()
      while turtle.down do
      turtle.down()
      end
    end
print("all done")
end

--[[coding]]--
print("Make sure I have fuel")
print("Am I one block above level?")
print("Do I have gravel in my 2nd slot?")
os.sleep(5)
all()