REST API: Add `permalink_structure` to the index endpoint.

This allows Gutenberg to implement permalink editing.

Props schlessera.
Fixes #42465.


Built from https://develop.svn.wordpress.org/trunk@42142


git-svn-id: http://core.svn.wordpress.org/trunk@41973 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/class-wp-rest-server.php

@@ -1017,15 +1017,16 @@ class WP_REST_Server {
 	public function get_index( $request ) {
 		// General site data.
 		$available = array(
-			'name'            => get_option( 'blogname' ),
-			'description'     => get_option( 'blogdescription' ),
-			'url'             => get_option( 'siteurl' ),
-			'home'            => home_url(),
-			'gmt_offset'      => get_option( 'gmt_offset' ),
-			'timezone_string' => get_option( 'timezone_string' ),
-			'namespaces'      => array_keys( $this->namespaces ),
-			'authentication'  => array(),
-			'routes'          => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
+			'name'                => get_option( 'blogname' ),
+			'description'         => get_option( 'blogdescription' ),
+			'url'                 => get_option( 'siteurl' ),
+			'home'                => home_url(),
+			'gmt_offset'          => get_option( 'gmt_offset' ),
+			'timezone_string'     => get_option( 'timezone_string' ),
+			'permalink_structure' => get_option( 'permalink_structure' ),
+			'namespaces'          => array_keys( $this->namespaces ),
+			'authentication'      => array(),
+			'routes'              => $this->get_data_for_routes( $this->get_routes(), $request['context'] ),
 		);
 
 		$response = new WP_REST_Response( $available );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42140';
+$wp_version = '5.0-alpha-42142';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.