1 files changed, 79 insertions, 0 deletions
diff --git a/plugins/jetpack/modules/theme-tools/site-breadcrumbs.php b/plugins/jetpack/modules/theme-tools/site-breadcrumbs.php
new file mode 100644
index 00000000..2f266738
--- /dev/null
+++ b/plugins/jetpack/modules/theme-tools/site-breadcrumbs.php
@@ -0,0 +1,79 @@
+<?php
+/**
+ * Plugin Name: Site Breadcrumbs
+ * Plugin URI: https://wordpress.com
+ * Description: Quickly add breadcrumbs to the single view of a hierarchical post type or a hierarchical taxonomy.
+ * Author: Automattic
+ * Version: 1.0
+ * Author URI: https://wordpress.com
+ * License: GPL2 or later
+ */
+
+function jetpack_breadcrumbs() {
+	$taxonomy                 = is_category() ? 'category' : get_query_var( 'taxonomy' );
+	$is_taxonomy_hierarchical = is_taxonomy_hierarchical( $taxonomy );
+
+	$post_type                 = is_page() ? 'page' : get_query_var( 'post_type' );
+	$is_post_type_hierarchical = is_post_type_hierarchical( $post_type );
+
+	if ( ! ( $is_post_type_hierarchical || $is_taxonomy_hierarchical ) || is_front_page() ) {
+		return;
+	}
+
+	$breadcrumb = '';
+
+	if ( $is_post_type_hierarchical ) {
+		$post_id   = get_queried_object_id();
+		$ancestors = array_reverse( get_post_ancestors( $post_id ) );
+		if ( $ancestors ) {
+			foreach ( $ancestors as $ancestor ) {
+				$breadcrumb .= '<span itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><a href="' . esc_url( get_permalink( $ancestor ) ) . '" itemprop="item"><span itemprop="name">' . esc_html( get_the_title( $ancestor ) ) . '</span></a></span>';
+			}
+		}
+		$breadcrumb .= '<span class="current-page" itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><span itemprop="name">' . esc_html( get_the_title( $post_id ) ) . '</span></span>';
+	} elseif ( $is_taxonomy_hierarchical ) {
+		$current = get_term( get_queried_object_id(), $taxonomy );
+
+		if ( is_wp_error( $current ) ) {
+			return;
+		}
+
+		if ( $current->parent ) {
+			$breadcrumb = jetpack_get_term_parents( $current->parent, $taxonomy );
+		}
+
+		$breadcrumb .= '<span class="current-category" itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><span itemprop="name">' . esc_html( $current->name ) . '</span></span>';
+	}
+
+	$home = '<span itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><a href="' . esc_url( home_url( '/' ) ) . '" class="home-link" itemprop="item" rel="home"><span itemprop="name">' . esc_html__( 'Home', 'jetpack' ) . '</span></a></span>';
+
+	echo '<nav class="entry-breadcrumbs" itemscope itemtype="https://schema.org/BreadcrumbList">' . $home . $breadcrumb . '</nav>';
+}
+
+/**
+ * Return the parents for a given taxonomy term ID.
+ *
+ * @param int    $term Taxonomy term whose parents will be returned.
+ * @param string $taxonomy Taxonomy name that the term belongs to.
+ * @param array  $visited Terms already added to prevent duplicates.
+ *
+ * @return string A list of links to the term parents.
+ */
+function jetpack_get_term_parents( $term, $taxonomy, $visited = array() ) {
+	$parent = get_term( $term, $taxonomy );
+
+	if ( is_wp_error( $parent ) ) {
+		return $parent;
+	}
+
+	$chain = '';
+
+	if ( $parent->parent && ( $parent->parent != $parent->term_id ) && ! in_array( $parent->parent, $visited ) ) {
+		$visited[] = $parent->parent;
+		$chain    .= jetpack_get_term_parents( $parent->parent, $taxonomy, $visited );
+	}
+
+	$chain .= '<a href="' . esc_url( get_category_link( $parent->term_id ) ) . '">' . $parent->name . '</a>';
+
+	return $chain;
+}