--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/sitemaps.php	Tue Dec 15 13:49:49 2020 +0100
@@ -0,0 +1,125 @@
+<?php
+/**
+ * Sitemaps: Public functions
+ *
+ * This file contains a variety of public functions developers can use to interact with
+ * the XML Sitemaps API.
+ *
+ * @package WordPress
+ * @subpackage Sitemaps
+ * @since 5.5.0
+ */
+
+/**
+ * Retrieves the current Sitemaps server instance.
+ *
+ * @since 5.5.0
+ *
+ * @global WP_Sitemaps $wp_sitemaps Global Core Sitemaps instance.
+ *
+ * @return WP_Sitemaps Sitemaps instance.
+ */
+function wp_sitemaps_get_server() {
+	global $wp_sitemaps;
+
+	// If there isn't a global instance, set and bootstrap the sitemaps system.
+	if ( empty( $wp_sitemaps ) ) {
+		$wp_sitemaps = new WP_Sitemaps();
+		$wp_sitemaps->init();
+
+		/**
+		 * Fires when initializing the Sitemaps object.
+		 *
+		 * Additional sitemaps should be registered on this hook.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param WP_Sitemaps $wp_sitemaps Sitemaps object.
+		 */
+		do_action( 'wp_sitemaps_init', $wp_sitemaps );
+	}
+
+	return $wp_sitemaps;
+}
+
+/**
+ * Gets an array of sitemap providers.
+ *
+ * @since 5.5.0
+ *
+ * @return WP_Sitemaps_Provider[] Array of sitemap providers.
+ */
+function wp_get_sitemap_providers() {
+	$sitemaps = wp_sitemaps_get_server();
+	return $sitemaps->registry->get_providers();
+}
+
+/**
+ * Registers a new sitemap provider.
+ *
+ * @since 5.5.0
+ *
+ * @param string               $name     Unique name for the sitemap provider.
+ * @param WP_Sitemaps_Provider $provider The `Sitemaps_Provider` instance implementing the sitemap.
+ * @return bool Whether the sitemap was added.
+ */
+function wp_register_sitemap_provider( $name, WP_Sitemaps_Provider $provider ) {
+	$sitemaps = wp_sitemaps_get_server();
+	return $sitemaps->registry->add_provider( $name, $provider );
+}
+
+/**
+ * Gets the maximum number of URLs for a sitemap.
+ *
+ * @since 5.5.0
+ *
+ * @param string $object_type Object type for sitemap to be filtered (e.g. 'post', 'term', 'user').
+ * @return int The maximum number of URLs.
+ */
+function wp_sitemaps_get_max_urls( $object_type ) {
+	/**
+	 * Filters the maximum number of URLs displayed on a sitemap.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param int    $max_urls    The maximum number of URLs included in a sitemap. Default 2000.
+	 * @param string $object_type Object type for sitemap to be filtered (e.g. 'post', 'term', 'user').
+	 */
+	return apply_filters( 'wp_sitemaps_max_urls', 2000, $object_type );
+}
+
+/**
+ * Retrieves the full URL for a sitemap.
+ *
+ * @since 5.5.1
+ *
+ * @param string $name         The sitemap name.
+ * @param string $subtype_name The sitemap subtype name.  Default empty string.
+ * @param int    $page         The page of the sitemap.  Default 1.
+ * @return string|false The sitemap URL or false if the sitemap doesn't exist.
+ */
+function get_sitemap_url( $name, $subtype_name = '', $page = 1 ) {
+	$sitemaps = wp_sitemaps_get_server();
+	if ( ! $sitemaps ) {
+		return false;
+	}
+
+	if ( 'index' === $name ) {
+		return $sitemaps->index->get_index_url();
+	}
+
+	$provider = $sitemaps->registry->get_provider( $name );
+	if ( ! $provider ) {
+		return false;
+	}
+
+	if ( $subtype_name && ! in_array( $subtype_name, array_keys( $provider->get_object_subtypes() ), true ) ) {
+		return false;
+	}
+
+	$page = absint( $page );
+	if ( 0 >= $page ) {
+		$page = 1;
+	}
+	return $provider->get_sitemap_url( $subtype_name, $page );
+}