BerryTurtle

row = 0

function switch()
  print("Met a wall, switching row")
  if row % 2 == 0 then
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
  else
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
  end
  row = row + 1
end

function move()
  turtle.forward()
  local success, data = turtle.inspectDown()
  if success then
    if data.name == "JABBA:barrel" then
      unload()
      return true
    elseif not data.name == "TConstruct:ore.berries.two" then
      turtle.back()
      switch()
      return false
    end
  end
end

function harvest()
  turtle.attackUp()
  turtle.attackDown()
end

function unload()
  for i = 1,16 do
    turtle.select(i)
    turtle.dropDown()
  end
  if row % 2 == 0 then
    turtle.turnRight()
    turtle.turnRight()
  end
  row = 0
end

---------Main-----------

while true do
 if move() then
   sleep(st)
 end
  harvest()
end