How to retrieve current tag name in awesome wm?

Question

I am looking to replace the tag list in awesome WM with a simple text box that only displays the name of the current tag. I have tried to create a textbox that contains the following code:

mytagbox = widget({ type = "textbox" })
mytagbox.text = awful.tag.selected(s).getproperty("name")

But this does not work and reverts awesome to its default config. What is the correct code I need to put in to make this possible? I'm also using Shifty. Thanks