Minecraft Turtle: Redwood Chopper

--[[
    2013 (c) psychedelixx
    Minecraft Turtle: Redwood Chopper
    2013-05-22

    Chops a whole redwood tree and returns to the ground. It should work on every other 2x2 tree as well.

    Usage:
    - Place the turtle [T] on the ground in front of the redwood [R] tree on the left side:

        [R][R]
        [R][R]
        [T]

        (top view)

        - use turtle and type "label set <name>"
          (to give your turtle an unique name so it remembers its programs)
        - type "pastebin get q1CdH3bN redwood"
    - type "redwood"
--]]

if turtle.getFuelLevel() == 0 then
    turtle.refuel()
end

if turtle.getFuelLevel() == 0 then
    print("I need fuel!")
else
    print("======== 2013 (c) psychedelixx ========")
    print("Let's go!")
    h=0
    turtle.dig()
    turtle.forward()
    repeat
        print("Fuel: " .. turtle.getFuelLevel())
        turtle.dig()
        turtle.digUp()
        turtle.up()
        h = h+1

        if turtle.getFuelLevel() < 2 then
            turtle.refuel()
        end
    until not turtle.detectUp()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
    while h>0 do
        print("Fuel: " .. turtle.getFuelLevel())
        turtle.dig()
        turtle.digDown()
        turtle.down()
        h = h-1

        if turtle.getFuelLevel() < 2 then
            turtle.refuel()
        end
    end
    turtle.dig()
end