CC Tree Cutter

local treesToCut = 100

function autoRefuel()
    if turtle.getFuelLevel() < 80 then
        turtle.select(16)
        while turtle.getFuelLevel() < 80 do
            turtle.refuel(1)
        end
        turtle.select(1)
    end
end

for i=1, treesToCut do
autoRefuel()

-- replenish missing materials
-- wood for fuel
turtle.select(16)
turtle.suckDown(64-turtle.getItemCount(16))
-- bonemeal
turtle.turnRight()
turtle.forward()
turtle.select(14)
turtle.suckDown(64-turtle.getItemCount(14))
-- saplings
turtle.forward()
turtle.select(15)
turtle.suckDown(64-turtle.getItemCount(15))

turtle.select(1)

-- go back
turtle.back()
turtle.back()
turtle.turnLeft()

-- place sapling
turtle.select(15)
turtle.place()

-- bonemeal sapling
turtle.select(14)
while turtle.place() do

end
turtle.select(1)

-- cut tree
while turtle.detect() do
    turtle.dig()
    turtle.digUp()
    turtle.up()
end

while not turtle.detectDown() do
    turtle.down()
end

for j=1,12 do
    turtle.select(j)
    turtle.dropDown()
end
turtle.select(1)

end
-- repeat