function fuel()
	while true do
		if turtle.getFuelLevel() < 50 then
		print("current fuel is " ..turtle.getFuelLevel().. " need 50+")
		print("Please insert fuel source in slot 1")
			for i=1, 16 do
				turtle.select(i)
				turtle.refuel()
			end
		break
		else
		break
		end
	end
end



function clear()
term.clear()
term.setCursorPos(1,1)
end

function vDig()
        local goDown = 0
        local goUp

        repeat
                goUp = 0
                while turtle.detectUp() do
                        turtle.dig()
                        goUp = goUp + 1
                end

                for i=1,goUp do
                        while not turtle.up() do turtle.attackUp() end
                        goDown = goDown + 1
                end
        until not turtle.detectUp()

        for i=1,goDown do
                while not turtle.down() do turtle.attackDown() end
        end
end

   function go()
	while not turtle.forward() do
		fuel()
		turtle.dig()
		turtle.attack()
		sleep(.5)
	end
vDig()
end

  function forward()
     for i=1, x do
       if turtle.detectDown() == false then
         turtle.select(2)
         turtle.placeDown()
         else
         go()
       end
     end
  end




  term.write("How many blocks forward? ")
  x = tonumber(io.read())
     clear()

 while true do
  print("Do you want the turtle to turn")
  print("Right or Left? R/L ")
  local event, param1 = os.pullEvent ("char")
  if param1 == "l" then
   print(" You chose Left! ")
   direction = "Left"

   sleep(2)
   break

  elseif param1 == "r" then
   print("You chose Right! ")
   direction = "Right"
   sleep(2)
   break
  else
   print ("Not valid!")
     sleep(1.5)
    clear()
   end
   end

clear()

   print("How many blocks to the " ..direction)
   print("do you want to go? ")
     y = tonumber(io.read())



     clear()
     print("Checking fuel...")
     sleep(2)
     fuel()
     sleep(2)


     if direction == "Left" then
   print("Starting! Left! ")
     else
	 print("Starting! Right!")
	 end
for i=1,y do
        forward()

   if i < y then
       if direction == "Left" then
          turtle.turnLeft()
          go()
          turtle.turnLeft()
          direction = "Right"
       else
          turtle.turnRight()
          go()
          turtle.turnRight()
          direction = "Left"
          end
     end
end

clear()