<?
function sm_set ( $var, $val ) {
  return $GLOBALS['smarty']->assign( $var, $val );
}

function sm_display ( $tpl = '' ) {
  if ($GLOBALS['debug']) { $GLOBALS['smarty']->clear_cache($tpl); }

  global $sm_display_varspec;
  foreach( $sm_display_varspec as $varname => $format) {
    eval("global \$$varname; sm_set( '$varname', \$$varname );");
  }

  if ($tpl == '') {
    // default to the same name as the script
    global $HTTP_SERVER_VARS;
    ereg( $GLOBALS['site_base'] . "(.*)\.php", $HTTP_SERVER_VARS['SCRIPT_FILENAME'], $match );
    $tpl = "$match[1].tpl";
  }

  return $GLOBALS['smarty']->display( $tpl );
}

function sm_page_contract( $argspec, $varspec ) {
  //argspec is a description of the arguments required by the page
  // varspec is a description of the variables returned to the template

  foreach( $argspec as $varname => $format ) {
 
    global $HTTP_POST_VARS;
    global $HTTP_GET_VARS;
    global $HTTP_COOKIE_VARS;

    if( isset( $HTTP_POST_VARS["$varname"] )) {
      $tmpvar = $HTTP_POST_VARS["$varname"];
    } elseif( isset( $HTTP_GET_VARS["$varname"] )) {
      $tmpvar = $HTTP_GET_VARS["$varname"];
    } elseif( isset( $HTTP_COOKIE_VARS["$varname"] )) {
      $tmpvar = $HTTP_COOKIE_VARS["$varname"];
    } else {
      // if there is a default, use it - if it's required, return an error
    }
    
    eval( "global \$$varname; \$$varname = \$tmpvar;" );
    
  }


  // this gets processed at display time
  global $sm_display_varspec;
  $sm_display_varspec = $varspec;

}

# XXX TODO : create an export_vars function, which can auto-detect arrays and export appropriately
# - hmm, how will it be associated with a form without being part of an ad_form... it could be query string (bleh) or session (complicated) or a tpl tag (but it should be in the php)...

?>