followLine

function cutDownTree()
    print("Cutting down tree")
    s, d = turtle.inspect()
    while s do
        turtle.dig()
        turtle.digUp()
        turtle.up()
        s, d = turtle.inspect()
    end

    print("Going down")
    s, d = turtle.inspectDown()
    while not s do
        turtle.down()
        s, d = turtle.inspectDown()
    end
    print("Tree down")
end

function getAroundTree()
    print("Getting around tree")
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
end

function tryForward()
    -- Try to go forward
    if not turtle.forward() then
        s, d = turtle.inspect()
        if d.name == "ic2:rubber_wood" then
            cutDownTree()
            return true
        elseif d.name == "ic2:sapling" then
            getAroundTree()
            return true
        else
            print("Can not go forward")
            return false    -- return false if stuck
    end

    -- return false if not line
    s, d = turtle.inspectDown()
    if d.name ~= "minecraft:stone_slab" then
        print("Line lost")
        turtle.back()
        return false
    end
    return true
end

function followLine()
    while true do
        if not tryForward() then
            turtle.turnRight()
            if not tryForward() then
                turtle.turnLeft()
                turtle.turnLeft()

                if not tryForward() then
                    print("Stuck")
                    return
                end
            end
        end
    end
end

followLine()