Tutle Strip mine

local args = {...}

local stripLength = 32
local count = 0

if not #args == 1 then
  print("Usage: smine <mines>")
  return
end

function strip()
  count = 0
  for i=1,stripLength do
    count = count + 1
    checkFuel(count)
    checkInv()
    while not turtle.forward() do turtle.dig() end
    while turtle.detectUp() do
      turtle.digUp()
      sleep(0.2)
    end
    while turtle.detectDown() do
      turtle.digDown()
      sleep(0.2)
    end

    if i%8 == 0 then
      turtle.select(16)
      while not turtle.forward() do turtle.dig() end
      while turtle.detectDown() do
        turtle.digDown()
        sleep(0.2)
      end
      if not turtle.back() then
        turtle.turnLeft()
        turtle.turnLeft()
        while not turtle.forward do turtle.dig() end
        turtle.turnLeft()
        turtle.turnLeft()
      end
      turtle.placeDown()
      turtle.select(1)
    end
  end

  turtle.turnLeft()
  turtle.turnLeft()

  for i=1,stripLength do
    while not turtle.forward() do turtle.dig() end
  end
end

function checkFuel(count)
  if turtle.getFuelLevel() <= count then
    print("Error: Low fuel")
    for i=1,14 do
      turtle.select(i)
      turtle.refuel()
    end
    turtle.select(1)
    if turtle.getFuelLevel() <= count then
        turtle.turnLeft()
        turtle.turnLeft()
        print("returning")
        print(count)
        for i=0,count do
            turtle.forward()
        end
        emptyInv()
        turtle.turnRight()
    end
  end
end

function checkInv()
  isFull = true

  for i=1,14 do
    if turtle.getItemCount(i) == 0 then
      isFull = false
    end
  end

  if isFull == true then
    turtle.select(15)
    while not turtle.placeDown() do turtle.digDown() end
    for i=1,14 do
      turtle.select(i)
      turtle.dropDown()
    end
    turtle.select(15)
    turtle.digDown()
    sleep(0.2)
    turtle.select(1)
  end
end

function emptyInv()
    turtle.select(15)
    while not turtle.placeDown() do turtle.digDown() end
    for i=1,14 do
        turtle.select(i)
        turtle.dropDown()
    end
    turtle.select(15)
    turtle.digDown()
    sleep(0.2)
    turtle.select(1)
end

for x=1,args[1] do
  turtle.turnLeft()
  strip()
  strip()
  turtle.turnRight()
  for y=1,3 do
    while not turtle.forward() do turtle.dig() end
    while turtle.detectUp() do
      turtle.digUp()
      sleep(0.2)
    end
    while turtle.detectDown() do
      turtle.digDown()
      sleep(0.2)
    end
  end
  turtle.select(16)
      turtle.placeDown()
      turtle.select(1)
print("Mined " .. x .. ", " .. args[1]-x .. " left to go.")
end
emptyInv()