Make holes

local tArgs = {...}
local holes = tArgs[1]
local firstItem,lastItem = 4,13
local Ypos = 64
local temp = 0
term.setCursorPos(1,1)
term.clear()
if #tArgs == 1 then
    print("Ok, I am going to make "..holes.." holes!")
    print("To cansel hold Ctrl + T in 1 second")
    sleep(5)
else
    print("Error!")
    print("Wrong amount of arguments! This program only support 1 argument")
    print()
    print("Argument 1 = Holes you want to dig")
    holes = 0
end

function fuel()
  if turtle.getFuelLevel() <= 10 then
    turtle.select(16)
    turtle.refuel(1)
  end
end

function isValuable()

  for i=1,3 do
    turtle.select(i)
    if turtle.detect() == false or turtle.compare() then
        return false
    end
  end
  return true
end

function checkWalls(dep)
  for j=1,4 do
    if isValuable() then
      turtle.dig()
    end
    turtle.turnRight()
  end
end

function putAwayInventory()
    turtle.select(15)
    turtle.place()
    for i=firstItem,lastItem do
        turtle.select(i)
        turtle.drop()
    end
end

-- ( Program Start ) --


for h = 1,holes do
    fuel()
    local depth = 1

    turtle.digDown()
    turtle.down()
    turtle.digDown()
    while turtle.detectDown() == false do
    fuel()
    turtle.down()
    depth = depth + 1
    checkWalls(depth)
    turtle.digDown()
    end

    for k=1,depth do
    fuel()
    turtle.up()
    end

    turtle.select(14)
    turtle.placeDown()
    turtle.turnRight()
    putAwayInventory()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
end