Extend Genesis_Breadcrumb class to support hierarchical custom post types

breadcrumb.php

<?php

/**
 * Class to control breadcrumbs display. Adds hierachical display of custom post type breadcrumbs
 * to the Genesis default.
 *
 * Note - to avoid conflicts this file must be loaded after the main Genesis_Breadcrumbs class has loaded,
 * so the loading is triggered in class Site_Hooks.
 */
class Site_Breadcrumb extends Genesis_Breadcrumb {

	public function __construct() {
		parent::__construct();
	}

	/**
	 * Get breadcrumb for single custom post type entry, including any parent (CPT name) crumbs.
	 *
	 * @since 2.0.0
	 *
	 * @return string HTML markup for a single custom post type entry breadcrumb, including
	 *                any parent (CPT name) breadcrumbs.
	 */
	protected function get_cpt_crumb() {

		$post_type        = get_query_var( 'post_type' );
		$post_type_object = get_post_type_object( $post_type );

		if ( $post_type_object->hierarchical ) {

			return $this->get_hierarchical_cpt_crumb();

		} else {

			if ( $cpt_archive_link = get_post_type_archive_link( $post_type ) ) {
				$crumb = $this->get_breadcrumb_link(
					$cpt_archive_link,
					'',
					$post_type_object->labels->name
				);
			} else {
				$crumb = $post_type_object->labels->name;
			}

			$crumb .= $this->args[ 'sep' ] . single_post_title( '', FALSE );
		}

		return $crumb;

	}

	/**
	 * Get breadcrumb for single hierarchical custom post type entry.
	 *
	 * @return string HTML markup for a single custom post type entry breadcrumb
	 */
	public function get_hierarchical_cpt_crumb() {

		global $wp_query;

		if ( $this->page_shown_on_front() && is_front_page() ) {
			// Don't do anything - we're on the front page and we've already dealt with that elsewhere.
			$crumb = $this->get_home_crumb();
		} else {
			$post             = $wp_query->get_queried_object();
			$post_type        = get_query_var( 'post_type' );
			$post_type_object = get_post_type_object( $post_type );
			$crumbs           = array();

			if ( $cpt_archive_link = get_post_type_archive_link( $post_type ) ) {
				$crumbs[] = $this->get_breadcrumb_link( $cpt_archive_link, '', $post_type_object->labels->name );
			} else {
				$crumbs[] = $post_type_object->labels->name;
			}

			// If this is a top level Page, it's simple to output the breadcrumb.
			if ( ! $post->post_parent ) {
				$crumbs[] = get_the_title();
			} else {
				if ( isset( $post->ancestors ) ) {
					if ( is_array( $post->ancestors ) ) {
						$ancestors = array_values( $post->ancestors );
					} else {
						$ancestors = array( $post->ancestors );
					}
				} else {
					$ancestors = array( $post->post_parent );
				}

				foreach ( $ancestors as $ancestor ) {
					$crumbs[] = $this->get_breadcrumb_link( get_permalink( $ancestor ), '', get_the_title( $ancestor ) );
				}

				// Add the current page title.
				$crumbs[] = get_the_title( $post->ID );
			}
			$crumb = join( $this->args[ 'sep' ], $crumbs );
		}

		return $crumb;
	}

	/**
	 * Replace the standard genesis_do_breadcrumbs action with our own,
	 * but only if the standard hook is set.
	 *
	 * Note - if a theme inserts breadcrumbs elsewhere, we will need to
	 * manually change the hook to use our own breadcrumbs
	 */
	public static function init() {

		if( has_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' ) ) {
			remove_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' );
			add_action( 'genesis_before_loop', __CLASS__ . '::do_breadcrumbs', 9 );
		}

	}

	/**
	 * Display Breadcrumbs above the Loop.
	 */
	public static function do_breadcrumbs( $args = array() ) {

		if (
			( ( 'posts' === get_option( 'show_on_front' ) && is_home() ) && ! genesis_get_option( 'breadcrumb_home' ) ) ||
			( ( 'page' === get_option( 'show_on_front' ) && is_front_page() ) && ! genesis_get_option( 'breadcrumb_front_page' ) ) ||
			( ( 'page' === get_option( 'show_on_front' ) && is_home() ) && ! genesis_get_option( 'breadcrumb_posts_page' ) ) ||
			( is_single() && ! genesis_get_option( 'breadcrumb_single' ) ) ||
			( is_page() && ! genesis_get_option( 'breadcrumb_page' ) ) ||
			( ( is_archive() || is_search() ) && ! genesis_get_option( 'breadcrumb_archive' ) ) ||
			( is_404() && ! genesis_get_option( 'breadcrumb_404' ) ) ||
			( is_attachment() && ! genesis_get_option( 'breadcrumb_attachment' ) )
		)
			return;

		global $_genesis_breadcrumb;

		if ( ! $_genesis_breadcrumb )
			$_genesis_breadcrumb = new Site_Breadcrumb;

		$_genesis_breadcrumb->output( $args );
	}
}

/* EOF */