local arg = { ... }
local x = 6
local y = 6




function init()
  if not arg[1] == nil then
    x = tonumber(arg[1])
        if x < 1 then
      x = 6
    end
  end

  if not arg[2] == nil then
    y = tonumber(arg[1])
       if x < 1 then
    x = 6
    end
  end
end






function clearRow()
  local l = 1

  while x > l do
    if turtle.detectDown then
      turtle.digDown()
    end

    if turtle.detect() then
      turtle.dig()
    end

    turtle.forward()

	l = l + 1
  end

  turtle.digDown()
end





function turn(d)
  if d == 0 then
    turtle.turnRight()
  else
    turtle.turnLeft()
  end
end





function harvest()

  turtle.up()

  if turtle.detect() then
    turtle.dig()
  end

  turtle.forward()

  -- turtle is now in position

  local d = 0
  local w = 1

  while w < y do
    clearRow()

    turn(d)

    if turtle.detect() then
         turtle.dig()
    end

       turtle.forward()
    turn(d)

       w = w + 1

    if d == 1 then
         d = 0
       else
         d = 1
    end
  end
end





init()

harvest()