StripMine()

local fuel = 1
local tunnelLength = 64
local turnRight = 0
function turtle.detectGravel()
  os.sleep(0.1)
  while turtle.detect() do
    turtle.dig()
    os.sleep(0.1)
  end
end

function turtle.checkFuel()
  while turtle.getFuelLevel() < 200 do
    turtle.select(1)
    refuelAmount = turtle.getItemCount(1) -1
    turtle.refuel(refuelAmount)
  end
  print("refueled")
end

print("put fuel in slot 1, torches in slot 2.")
print("Go right = 0, Go left = 1")
turnRight = tonumber(read())
print("tunnel length?")
tunnelLength = tonumber(read())

while true do
for i = 1, tunnelLength do
    turtle.checkFuel()
    turtle.dig()
    turtle.detectGravel()
    if i % 10 == 0 then
      turtle.turnLeft()
      turtle.turnLeft()
      turtle.select(2)
      turtle.place()
      turtle.turnRight()
      turtle.turnRight()
    end
    turtle.forward()
    turtle.digUp()
  end
  if turnRight == 0 then
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.turnRight()
    turnRight = 1
  else
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.turnLeft()
    turnRight = 0
  end
end