farmTree (single)

function empty()
   turtle.turnLeft()
   turtle.turnLeft()
   for i=2, 16 do
      turtle.select(i)
      turtle.drop()
   end
   turtle.turnLeft()
   turtle.turnLeft()
end

function plant()
   turtle.select(1)
   turtle.place()
end

function cut()
   turtle.dig()
   turtle.forward()
   while turtle.detectUp() do
      turtle.digUp()
      turtle.up()
   end
   while not turtle.detectDown() do
      turtle.down()
   end
   turtle.back()
end

function test()
   for i=1, 12 do
      j = turtle.getItemCount(1)
      if j>1 then
         return 1
      else
         if i==1 then
            print("Nedovoljno saplinga (stavi saplinge u slot 1).")
         end
         sleep(5)
      end
   end
   print("Nisu umetnuti potrebni resursi, obustavljam program...")
end

--GLAVNI PROGRAM

k = 0
k = test()
while k do
   plant()
   turtle.up()
   while not turtle.detect() do
      sleep(2)
   end
   turtle.down()
   cut()
   empty()
   k = test()
end