Auto Feller

--[[place some wood to slot 1
any kind of fertilizer to slot 2 (I assume it will be compatible with 1.5 as it applies fertilizer until something grows.
saplings to slot 3.
incoming fertilizer chest to the right
incoming sapling chest to the left
outgoing wood chest to the back.
this is intended to be used in FTB mod pack with wood golems collecting sulfur goo from torches and dropped saplings from the dead tree. you make a mob grinder for continuous fertilizer input in vanilla and have other turtles collect dropped sapplings. alternatively, you could have this turtle patrol around to collect them but it will increase fuel consumption. by default, it uses wood in slot 1 as fuel]]--

function cut() --cut a regular tree. will not seek all branches of a large tree. use a roof to limit growth
turtle.select(1)
local up=0
while turtle.compare() do
  up=up+1
  turtle.dig()
  turtle.digUp()

  while turtle.up()==false do
  end --persistent movement. if cant move, try again

end
for i=1,up,1 do
  while turtle.down()==false do
  end
end
end --end of cut


while true do
    c=turtle.getItemCount(2)--sulfur goo
    if c<=2 then
        turtle.turnRight()
        turtle.suck()
        turtle.turnLeft()
    end


    c=turtle.getItemCount(3)--sapling
    if c<=2 then
        turtle.turnLeft()
        turtle.suck()
        turtle.turnRight()
    end


    f=turtle.getFuelLevel()
    if f<15 then
        turtle.select(1)
        turtle.refuel(1)
        print("refuelling")
    end


    turtle.select(1)
    if turtle.compare() then
        print("tree detected. cutting...")
        cut()
        turtle.turnRight()
        turtle.turnRight()
        for i=4,16,1 do
            turtle.select(i)
            turtle.drop()
        end
        turtle.turnRight()
        turtle.turnRight()
        turtle.select(3)

        while turtle.place()==false do
        end
        print("placed sapling")
        print("3 minute sleep")

        os.sleep(60*3)
    end --end of cutting routine

    if turtle.detect()==false then
        print("nothing detected. placing sapling")
        turtle.select(3)
        while turtle.place()==false do
        end
    end

    turtle.select(1)
    while turtle.compare()==false and turtle.detect() do
    print("sapling detected. using fertilizer")
     turtle.select(2)
     turtle.place()
     turtle.select(1)
    end

end --end of main loop