[FTB-Turtle] 2*2 Treefarm

x=0
refuelNeeded=true

local function start()
    turtle.select(1)
    if turtle.compareTo(16)==false then
        print("Bitte sicherstellen, dass Saplings in Slot 1 und Vergleichssapling in Slot 16 liegen und [Enter] druecken.")
        io.read()
        return
    end
end

local function refuel()
    if (turtle.getFuelLevel()<100 and refuelNeeded==true) then
        turtle.select(2)
        turtle.refuel(turtle.getItemCount(2))
        turtle.select(1)
    end
end

local function plant()
    if (turtle.getFuelLevel()<30 and refuelNeeded==true) then
        print("Kein Treibstoff mehr vorhanden. Bitte Treibstoff in Slot 2 geben und eine Taste druecken.")
    end
    turtle.select(1)
    if turtle.getItemCount(1)<=1 then
        print("Bitte Saplings in Slot 1 nachfuellen.")
        io.read()
        return
    end
    turtle.forward()
    turtle.place()
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    turtle.turnRight()
    turtle.place()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    turtle.place()
end

local function wait()
    turtle.select(1)
    turtle.up()
    while turtle.detect()==false do
        sleep(1)
    end
end

local function tree()
    turtle.select(2)
    turtle.down()
    turtle.dig()
    turtle.forward()
    local h=0
    while turtle.detectUp()==true do
        turtle.dig()
        turtle.digUp()
        turtle.up()
        h=h+1

    end
    refuel()
    turtle.turnRight()
    turtle.dig()
    turtle.forward()
    turtle.turnLeft()
    for i=h, 1, -1 do
        turtle.dig()
        turtle.digDown()
        turtle.down()
    end
    turtle.dig()
    h=nil
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()
    x=x+1
    term.clear()
    term.setCursorPos(1, 1)
    print("Es wurden bisher ", x, " Baeume gefaellt.")
end

local function drop()
    refuel()
    turtle.turnLeft()
    turtle.select(2)
    if turtle.getItemCount(2)>1 then
        turtle.drop()
    end
    for i=3, 15, 1 do
        turtle.select(i)
        if turtle.getItemCount(i)>0 then
            turtle.drop()
        end

    end
    turtle.turnRight()
end

--------------------------

start()

while true do
    plant()
    drop()
    wait()
    tree()
end