Grinder

while true do
 turtle.attack()
 sleep(.1)
 turtle.suck()
 if turtle.getItemCount() > 0 then
    turtle.dropDown()
    end
 if turtle.getItemCount(2) > 0 then
    turtle.select(2)
    turtle.dropDown()
    turtle.select(1)
    end
 if turtle.getItemCount(3) > 0 then
    turtle.select(3)
    turtle.dropDown()
    turtle.select(1)
    end
 if turtle.getFuelLevel() < 500 then
    turtle.select(16)
    turtle.refuel(2)
    turtle.select(1)
    end
end