farm.lua

function failsafe()
    turtle.select(1)
    if not turtle.compareTo(14) then
        print("No more Saplings")
        print("Press any button to shutdown computer...")
        os.pullEvent("key")
        stop()
    end
    turtle.select(2)
    if not turtle.compareTo(15) then
        print("No more Bone Meal")
        print("Press any button to shutdown computer...")
        os.pullEvent("key")
        stop()
    end
    turtle.select(3)
    if not turtle.compareTo(16) then
        print("No more fuel")
        print("Press any button to shutdown computer...")
        os.pullEvent("key")
        stop()
    end
end
function stop()
    os.shutdown()
end
function chop()
    turtle.dig()
    turtle.digUp()
    turtle.up()
end
Bonemealcount = 20

while true do
    failsafe()
    while turtle.getFuelLevel() <= 20 do
        turtle.select(3)
        turtle.refuel(1)
    end
    turtle.select(1)
    turtle.place()
    turtle.select(2)
    for i = 1, Bonemealcount do
        turtle.place()
    end
    while turtle.detect() do
        chop()
    end
    while not turtle.detectDown() do
        turtle.down()
    end
end