Blocks: Add the reusable block post type, `wp_block`.

Merges [43804] from the 5.0 branch to trunk.

See #45098.

Built from https://develop.svn.wordpress.org/trunk@44146


git-svn-id: http://core.svn.wordpress.org/trunk@43976 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/edit.php

@@ -200,6 +200,11 @@ $wp_list_table->prepare_items();
 wp_enqueue_script( 'inline-edit-post' );
 wp_enqueue_script( 'heartbeat' );
 
+if ( 'wp_block' === $post_type ) {
+	wp_enqueue_script( 'wp-list-reusable-blocks' );
+	wp_enqueue_style( 'wp-list-reusable-blocks' );
+}
+
 $title = $post_type_object->labels->name;
 
 if ( 'post' == $post_type ) {

wp-includes/capabilities.php

@@ -574,6 +574,23 @@ function map_meta_cap( $cap, $user_id ) {
 				return call_user_func_array( 'map_meta_cap', $args );
 			}
 
+			// Block capabilities map to their post equivalent.
+			$block_caps = array(
+				'edit_blocks',
+				'edit_others_blocks',
+				'publish_blocks',
+				'read_private_blocks',
+				'delete_blocks',
+				'delete_private_blocks',
+				'delete_published_blocks',
+				'delete_others_blocks',
+				'edit_private_blocks',
+				'edit_published_blocks',
+			);
+			if ( in_array( $cap, $block_caps, true ) ) {
+				$cap = str_replace( '_blocks', '_posts', $cap );
+			}
+
 			// If no meta caps match, return the original cap.
 			$caps[] = $cap;
 	}

wp-includes/post.php

@@ -252,6 +252,38 @@ function create_initial_post_types() {
 		)
 	);
 
+	register_post_type(
+		'wp_block',
+		array(
+			'labels'          => array(
+				'name'          => __( 'Blocks' ),
+				'singular_name' => __( 'Block' ),
+				'search_items'  => __( 'Search Blocks' ),
+			),
+			'public'          => false,
+			'_builtin'        => true, /* internal use only. don't use this when registering your own post type. */
+			'show_ui'         => true,
+			'show_in_menu'    => false,
+			'rewrite'         => false,
+			'capability_type' => 'block',
+			'capabilities'    => array(
+				// You need to be able to edit posts, in order to read blocks in their raw form.
+				'read'                   => 'edit_posts',
+				// You need to be able to publish posts, in order to create blocks.
+				'create_posts'           => 'publish_posts',
+				'edit_published_posts'   => 'edit_published_posts',
+				'delete_published_posts' => 'delete_published_posts',
+				'edit_others_posts'      => 'edit_others_posts',
+				'delete_others_posts'    => 'delete_others_posts',
+			),
+			'map_meta_cap'    => true,
+			'supports'        => array(
+				'title',
+				'editor',
+			),
+		)
+	);
+
 	register_post_status(
 		'publish',
 		array(

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44145';
+$wp_version = '5.1-alpha-44146';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.