/* 
Custom shortcode to display active auctions (without future and past ones), usage [number_of_active_auctions]  
Code should be copy pasted to your child theme functions.php file.
*/

add_shortcode('number_of_active_auctions', 'number_of_active_auctions_function');
function number_of_active_auctions_function( ) {
	
	global $woocommerce;
	$meta_query = $woocommerce->query->get_meta_query();
	
	$args = array(
		'post_type'	=> 'product',
		'post_status' => 'publish',
		'ignore_sticky_posts'	=> 1,
		'meta_query' => array(
			'relation' => 'AND',
			// don't include past auctions
			'past_auctions' => array(
					'meta_key'     => '_auction_closed',
					'meta_compare' => 'NOT EXISTS'),
			// don't include future auctions
			'future_auctions' => array(
					'meta_key'     => '_auction_started',
					'meta_compare' => 'EXISTS')
		),
		'tax_query' => array(array('taxonomy' => 'product_type' , 'field' => 'slug', 'terms' => 'auction'))
		
	);
	$products = new WP_Query( $args );
	echo "Number of active auctions: ".$products->found_posts;
	wp_reset_postdata();	
}