Dig Layer

local args = { ... }

if #args ~= 3 then
  print("Usage: diglayer <rows> <rowlength> <depth>")
else

  first = true

  local function sRefuel()
    needfuel = true
    while needfuel do
      term.clear()
      term.setCursorPos(1,1)
      print("Insufficient fuel.")
      term.setCursorPos(1,2)
      print("Add fuel in slot 1 then")
      term.setCursorPos(1,3)
      print("ress any key to continue.")
      os.pullEvent("key")
      turtle.select(1)
      turtle.refuel()
      if args[1] * args[2] * args[3] >= turtle.getFuelLevel() then
        needfuel = false
      end
    end
  end

  if args[1] * args[2] * args[3] >= turtle.getFuelLevel() then
    sRefuel()
  end

    for i = 1, args[1] do

      if first == true then
        rowlen = args[2]
      elseif first == false then
        rowlen = args[2] - 1
      end

      for sI = 1, rowlen do
        turtle.dig()
        turtle.forward()
      end

      if args[1] ~= 1 then
        if ( i % 2) == 0 then
          turtle.turnLeft()
          turtle.dig()
          turtle.forward()
          turtle.turnLeft()
        else
          turtle.turnRight()
          turtle.dig()
          turtle.forward()
          turtle.turnRight()
        end
      end

      first = false

    end

end