bbp_request_feed_trap( array $query_vars = array() )

function bbp_request_feed_trap( $query_vars = array() ) {

	// Looking at a feed
	if ( isset( $query_vars['feed'] ) ) {

		// Forum/Topic/Reply Feed
		if ( isset( $query_vars['post_type'] ) ) {

			// Matched post type
			$post_type = false;

			// Post types to check
			$post_types = array(
				bbp_get_forum_post_type(),
				bbp_get_topic_post_type(),
				bbp_get_reply_post_type()
			);

			// Cast query vars as array outside of foreach loop
			$qv_array = (array) $query_vars['post_type'];

			// Check if this query is for a Forums post type
			foreach ( $post_types as $bbp_pt ) {
			    if ( in_array( $bbp_pt, $qv_array, true ) ) {
				    $post_type = $bbp_pt;
				    break;
			    }
			}

			// Looking at a Forums post type
			if ( ! empty( $post_type ) ) {

				// Supported select query vars
				$select_query_vars = array(
					'p'        => false,
					'name'     => false,
					$post_type => false,
				);

				// Setup matched variables to select
				foreach ( $query_vars as $key => $value ) {
					if ( isset( $select_query_vars[$key] ) ) {
						$select_query_vars[$key] = $value;
					}
				}

				// Remove any empties
				$select_query_vars = array_filter( $select_query_vars );

				// What Forums post type are we looking for feeds on?
				switch ( $post_type ) {

					// Forum
					case bbp_get_forum_post_type() :

						// Define local variable(s)
						$meta_query = array();

						// Single forum
						if ( !empty( $select_query_vars ) ) {

							// Load up our own query
							query_posts( array_merge( array(
								'post_type' => bbp_get_forum_post_type(),
								'feed'      => true
							), $select_query_vars ) );

							// Restrict to specific forum ID
							$meta_query = array( array(
								'key'     => '_bbp_forum_id',
								'value'   => bbp_get_forum_id(),
								'type'    => 'numeric',
								'compare' => '='
							) );
						}

						// Only forum replies
						if ( !empty( $_GET['type'] ) && ( bbp_get_reply_post_type() === $_GET['type'] ) ) {

							// The query
							$the_query = array(
								'author'         => 0,
								'feed'           => true,
								'post_type'      => bbp_get_reply_post_type(),
								'post_parent'    => 'any',
								'post_status'    => array( bbp_get_public_status_id(), bbp_get_closed_status_id() ),
								'posts_per_page' => bbp_get_replies_per_rss_page(),
								'order'          => 'DESC',
								'meta_query'     => $meta_query
							);

							// Output the feed
							bbp_display_replies_feed_rss2( $the_query );

						// Only forum topics
						} elseif ( !empty( $_GET['type'] ) && ( bbp_get_topic_post_type() === $_GET['type'] ) ) {

							// The query
							$the_query = array(
								'author'         => 0,
								'feed'           => true,
								'post_type'      => bbp_get_topic_post_type(),
								'post_parent'    => bbp_get_forum_id(),
								'post_status'    => array( bbp_get_public_status_id(), bbp_get_closed_status_id() ),
								'posts_per_page' => bbp_get_topics_per_rss_page(),
								'order'          => 'DESC'
							);

							// Output the feed
							bbp_display_topics_feed_rss2( $the_query );

						// All forum topics and replies
						} else {

							// Exclude private/hidden forums if not looking at single
							if ( empty( $select_query_vars ) )
								$meta_query = array( bbp_exclude_forum_ids( 'meta_query' ) );

							// The query
							$the_query = array(
								'author'         => 0,
								'feed'           => true,
								'post_type'      => array( bbp_get_reply_post_type(), bbp_get_topic_post_type() ),
								'post_parent'    => 'any',
								'post_status'    => array( bbp_get_public_status_id(), bbp_get_closed_status_id() ),
								'posts_per_page' => bbp_get_replies_per_rss_page(),
								'order'          => 'DESC',
								'meta_query'     => $meta_query
							);

							// Output the feed
							bbp_display_replies_feed_rss2( $the_query );
						}

						break;

					// Topic feed - Show replies
					case bbp_get_topic_post_type() :

						// Single topic
						if ( !empty( $select_query_vars ) ) {

							// Load up our own query
							query_posts( array_merge( array(
								'post_type' => bbp_get_topic_post_type(),
								'feed'      => true
							), $select_query_vars ) );

							// Output the feed
							bbp_display_replies_feed_rss2( array( 'feed' => true ) );

						// All topics
						} else {

							// The query
							$the_query = array(
								'author'         => 0,
								'feed'           => true,
								'post_parent'    => 'any',
								'posts_per_page' => bbp_get_topics_per_rss_page(),
								'show_stickies'  => false
							);

							// Output the feed
							bbp_display_topics_feed_rss2( $the_query );
						}

						break;

					// Replies
					case bbp_get_reply_post_type() :

						// The query
						$the_query = array(
							'posts_per_page' => bbp_get_replies_per_rss_page(),
							'meta_query'     => array( array( ) ),
							'feed'           => true
						);

						// All replies
						if ( empty( $select_query_vars ) ) {
							bbp_display_replies_feed_rss2( $the_query );
						}

						break;
				}
			}

		// Single Topic Vview
		} elseif ( isset( $query_vars[ bbp_get_view_rewrite_id() ] ) ) {

			// Get the view
			$view = $query_vars[ bbp_get_view_rewrite_id() ];

			// We have a view to display a feed
			if ( !empty( $view ) ) {

				// Get the view query
				$the_query = bbp_get_view_query_args( $view );

				// Output the feed
				bbp_display_topics_feed_rss2( $the_query );
			}
		}

		// @todo User profile feeds
	}

	// No feed so continue on
	return $query_vars;
}