startup

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 z = 1

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

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

    turtle.forward()
  end

  turtle.digDown()
end

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

function harvest()
  turtle.up()

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

  turtle.forward()

  local i = 0
  local k = 1
  while k < 6 do
    clearRow()

    turn(i)

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

       turtle.forward()
    turn(i)

       k = k + 1

    if i == 1 then
         i = 0
       else
         i = 1
    end
  end
end




init()

harvest()