accessing template variables in perl code

I expect my brain is fried and I'm doing it all wrong, but I'd
appreciate advice about how to access template variables in perl code.

I have a perl function that retrieves some data and returns it. I've put
the function in the stash so I can call it in a template. It needs to
decide what data to retrieve based on the name of the template, among
other things. Is there a way it can access the template.name directly,
to avoid having to pass the value as an argument every time?

Or a better way to approach the problem?

Thanks, Dave