startup

local cut = 0
while true do
  turtle.suck()
  turtle.turnRight()
  local ok,block = turtle.inspect()
  if ok and block and block.name:match("log") then
    turtle.select(2)
    turtle.dig()
    turtle.forward()
    while turtle.detectUp() do
      turtle.digUp()
      if turtle.getFuelLevel()<900 then
        turtle.refuel()
      end
      turtle.up()
    end
    while turtle.down() do
    end
    turtle.back()

    for i = 1, 16 do
      local item = turtle.getItemDetail(i)
      if item and not item.name:match("sapling") then
        turtle.select(i)
        turtle.dropUp()
      end
    end
    --[[turtle.select(1)
    turtle.place()]]
    if cut == 0 then
      cut = 180
    end
  elseif not ok then
    turtle.select(1)
    local item = turtle.getItemDetail()
    if item and item.name:match("sapling") then
      turtle.place()
    else
      for i = 1, 16 do
        turtle.select(i)
        local item = turtle.getItemDetail()
        if item and item.name:match("sapling") then
          turtle.transferTo(1)
          turtle.select(1)
          turtle.place()
          break
        end
      end
    end
  end
  if cut > 0 and turtle.getItemCount(1) < 32 then
    cut = cut-1
    if cut == 0 then
      turtle.down()
      turtle.suckDown()
      turtle.up()
    end
    if cut%20==0 then
      print(cut)
    end
  end
--[[  if turtle.getFuelLevel() < 1000 then
    turtle.select(2)
    turtle.suckUp()
    turtle.select(1)
    turtle.dropUp()
    turtle.craft()
    for i = 1, 16 do
      turtle.select(i)
      turtle.refuel()
    end
    turtle.select(1)
    turtle.suckUp()
  end ]]
end