clearLand

local fuelSlot = 1
local depth = 190
local width = 150
local height = 9
local success = false

function checkFuel(slot)
  while turtle.getFuelLevel() == 0 do
    turtle.select(fuelSlot)
  if turtle.getItemCount(fuelSlot) == 0 then
   fuelSlot = fuelSlot + 1
 end
 if fuelSlot == 16 then
      term.clear()
      print("Fuel slot ("..fuelSlot..") is empty....")
      print("Insert Fuel and")
      print("Press any key to continue...")
      os.pullEvent("key")
   fuelSlot = 1
  end
    turtle.refuel(1)
  end
  term.clear()
  print("Fuel OK!")
end
function digForward(distance)
  for i = 1, distance, 1 do
    turtle.dig()
    checkFuel(fuelSlot)
    while turtle.forward() == false do
      term.clear()
      print("Clear obstruction...")
   turtle.dig()
    end
  turtle.turnRight()
  turtle.select(16)
  turtle.place()
  turtle.turnLeft()
  end
end
function moveBack(distance)
  for i = 1, distance, 1 do
    checkFuel(fuelSlot)
 if turtle.back() == false then
      term.clear()
      print("Clear obstruction...")
   turtle.turnRight()
   turtle.turnRight()
   digForward(1)
   turtle.turnRight()
   turtle.turnRight()
    end
  end
end
function moveUp(distance)
  for i = 1, distance, 1 do
    checkFuel(fuelSlot)
    while turtle.up() == false do
      term.clear()
      print("Clear obstruction...")
   turtle.digUp()
    end
  end
end
function moveDown(distance)
  for i = 1, distance, 1 do
    checkFuel(fuelSlot)
    while turtle.down() == false do
      term.clear()
      print("Clear obstruction...")
   turtle.digDown()
    end
  end
end

--start program

for a = 1, width, 1 do
  for b = 1, height, 1 do
    digForward(depth+1)
    term.clear()
    print(a * 100 / width .. "% Complete...")
    moveBack(depth+1)
    moveUp(1)
  end
  moveDown(height)
  turtle.turnRight()
  digForward(1)
  turtle.turnLeft()
  term.clear()
  print(a * 100 / width .. "% Complete...")
end
turtle.turnLeft()
digForward(width)
turtle.turnRight()