Chopper_no_bm

local function checkFuel()
  if turtle.getFuelLevel() < 1 then
    turtle.select(2)
    turtle.refuel(1)
  end
end
--
local function Saplings()
  if turtle.getItemCount(1) > 3 then
    sleep(0)
  else
    print "Need at least 4 saplings in Slot 1"
      while turtle.getItemCount(1) < 4 do
        sleep(0)
      end
  end
end
--
local function Start()
  turtle.dig()
  checkFuel()
  turtle.forward()
end
--
local function FellUp()
up = 0
  while turtle.detectUp() do
    turtle.digUp()
    turtle.dig()
    checkFuel()
    turtle.up()
    up = up + 1
  end
end
--
local function Move()
  turtle.dig()
  checkFuel()
  turtle.turnRight()
  turtle.dig()
  turtle.forward()
  turtle.turnLeft()
end
--
local function FellDown()
  while up > 0 do
    turtle.dig()
    turtle.digDown()
    checkFuel()
    turtle.down()
    up = up - 1
  end
end
--
local function Plant() --That's a mess. Sorry :)
  turtle.dig()
  checkFuel()
  turtle.up()
  turtle.select(1)
  turtle.placeDown()
  checkFuel()
  turtle.forward()
  turtle.select(1)
  turtle.placeDown()
  turtle.turnLeft()
  checkFuel()
  turtle.forward()
  turtle.select(1)
  turtle.placeDown()
  turtle.turnLeft()
  checkFuel()
  turtle.forward()
  turtle.select(1)
  turtle.placeDown()
  checkFuel()
  turtle.forward()
  checkFuel()
  turtle.turnRight()
  turtle.down()
end
--
local function Drop()
    for i = 2,16 do
        turtle.select(i)
        turtle.drop()
    end
end
-- Begin
local function CheckTree()
  turtle.select(1)
  if turtle.compare() then
    Check = 0
  else
    Check = 1
  end
end
--
local function Chop() -- Main function
  while Check == 1 do
    term.clear() term.setCursorPos(1,1) term.write("Tree detected...Chopping")
    Start()
    FellUp()
    Move()
    FellDown()
    Plant()
    Drop()
    turtle.turnRight()
    Check = 0
  end
end
--
while true do
  Saplings()
  CheckTree()
  Chop()
  sleep(1)
  if Check == 0 then
    term.clear()
    term.setCursorPos(1,1)
    term.write("Waiting for Tree")
  end
end