Search within a WordPress category archive ( Genesis )

cat_archive_search.php

<?php
/**
 * 
 * first function gets URL of the current page, which is used in the search as the action parameter.
 * second function loads a search box above the content of a Genesis category archive.
 * the category name ( slug ) is passed through a hidden input as a search query parameter.
 * 
 **/
function current_page_url() {
	$pageURL = 'http';
	if( isset($_SERVER["HTTPS"]) ) {
		if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
	}
	$pageURL .= "://";
	if ($_SERVER["SERVER_PORT"] != "80") {
		$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
	} else {
		$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
	}
	return $pageURL;
}

add_action( 'genesis_before_content','atx_cat_search' );
function atx_cat_search() {
	global $wp_query;
	$my_cat = $wp_query->query_vars['category_name'];

	if ( is_category() ) :

		echo '
		<form method="get" class="search-form" action="'. current_page_url() .'" role="search">
			<input type="search" name="s" />
			<input type="hidden" name="category_name" id="category_name" value="'. $my_cat .'" />
			<input type="submit" value="'. __( 'Search','atx' ) .'" />
		</form>
		';

	endif;

}