How to get the URL at the listing_details.tpl

I prefer to create my own facebook, twitter and pinterest share button instead of using the plugin however i cannot figure out how to get the complete URL?

<a href="http://www.facebook.com/sharer.php?u=URL">

<a href="http://twitter.com/share?text=An%20Awesome%20Link&url=URL">

<a href="http://pinterest.com/pin/create/button/?url=URL">

Any advice?

this is to be inserted at listing_details.tpl

got it

URL = {$smarty.const.RL_URL_HOME}{$smarty.server.REQUEST _URI}

Nice job, helped with your topic :) thanks