DigSlave II

blocksmined=0
repeat
  if redstone.getInput("top")then

    -- is there a block in front of us
    if turtle.detect() then

            if turtle.getFuelLevel() <= 0 then
               print("Out of fuel, please give fuel")
               print("Press a key when fuel has been given")
               os.pullEvent("key")
               for i=1,16 do
                   turtle.select(i)
                   turtle.refuel()
               end
            end

            -- increment blocksmined
            blocksmined=blocksmined+1
            turtle.dig()
            turtle.suck()

            -- check slot 2 of turtle
            -- if an item is in it then
            -- overflow has occurred
            -- trigger the turtle to take
            -- a dump er leave one.
            if turtle.getItemCount(2)>0 then
                for slot=1,16 do
                    turtle.select(slot)
                    turtle.dropDown()
                end
            end

      end

  else
    break
  end
  term.clear()
  print("Blocksmined")
  print(blocksmined)
until x == 1