Universal themes: Add a setting to disable the Site Editor (#4154)

* Universal themes: Add a setting to disable the Site Editor

* Check for index.html template before attempting to disable the FSE plugin (in the same way Gutenberg does)

* Only add a widgets menu item when there isn't one already

* Add an index template

Co-authored-by: Jason Crist <jcrist@pbking.com>

blockbase/functions.php

@@ -100,3 +100,6 @@ function blockbase_fonts_url() {
  */
 require get_template_directory() . '/inc/wp-customize-colors.php';
 require get_template_directory() . '/inc/wp-customize-color-palettes.php';
+
+/** Add a checkbox to hide the Site Editor */
+require get_template_directory() . '/inc/disable-site-editor.php';

blockbase/inc/disable-site-editor.php

@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * Adds a setting to the Gutenberg experiments page to disable the Site Editor.
+ */
+function add_disable_site_editor_setting() {
+	if ( ! is_readable( get_stylesheet_directory() . '/block-templates/index.html' ) ) {
+		return;
+	}
+
+	add_settings_field(
+		'universal-theme-disable-site-editor',
+		__( 'Site Editor', 'gutenberg' ),
+		'gutenberg_display_experiment_field',
+		'gutenberg-experiments',
+		'gutenberg_experiments_section',
+		array(
+			'label' => __( 'Disable Site Editor', 'gutenberg' ),
+			'id'    => 'universal-theme-disable-site-editor',
+		)
+	);
+
+	if ( get_option( 'gutenberg-experiments' ) ) {
+		if ( array_key_exists( 'universal-theme-disable-site-editor', get_option( 'gutenberg-experiments' ) ) ) {
+			readd_legacy_admin_links();
+			remove_site_editor_admin_link();
+		}
+	}
+}
+
+/**
+ * Adds the Customizer and Widgets menu links back to the Dashboard under themes.
+ */
+function readd_legacy_admin_links() {
+	global $submenu;
+	if ( isset( $submenu['themes.php'] ) ) {
+		// Add Customize back to the admin menu.
+		$customize_url            = add_query_arg( 'return', urlencode( remove_query_arg( wp_removable_query_args(), wp_unslash( $_SERVER['REQUEST_URI'] ) ) ), 'customize.php' );
+		$submenu['themes.php'][6] = array( __( 'Customize' ), 'customize', esc_url( $customize_url ), '', 'hide-if-no-customize' );
+
+		if (
+			function_exists( 'gutenberg_use_widgets_block_editor') &&
+			gutenberg_use_widgets_block_editor() &&
+			! function_exists( 'wp_use_widgets_block_editor' ) &&
+			current_theme_supports( 'widgets' )
+		) {
+			// Find Widgets menu
+			$has_widgets_menu = false;
+			foreach ( $submenu['themes.php'] as $index => $menu_item ) {
+				if (
+					! empty( $menu_item[2] ) &&
+					( false !== strpos( $menu_item[2], 'gutenberg-widgets' ) ||
+					false !== strpos( $menu_item[2], 'widgets.php' ) )
+				) {
+					$has_widgets_menu = true;
+				}
+			}
+
+			// Add Widgets back to the admin menu.
+			if ( ! $has_widgets_menu ) {
+				add_theme_page(
+					__( 'Widgets', 'gutenberg' ),
+					__( 'Widgets', 'gutenberg' ),
+					'edit_theme_options',
+					'gutenberg-widgets',
+					'the_gutenberg_widgets',
+					2
+				);
+			}
+		}
+
+		ksort( $submenu['themes.php'] );
+	}
+}
+
+/**
+ * Removes the Site Editor link from the admin.
+ */
+function remove_site_editor_admin_link() {
+	global $menu;
+	// Remove Site Editor.
+	foreach ( $menu as $index => $menu_item ) {
+		if ( ! empty( $menu_item[5] ) && false !== strpos( $menu_item[5], 'toplevel_page_gutenberg-edit-site' ) ) {
+			$site_editor_index = $index;
+		}
+	}
+
+	unset( $menu[ $site_editor_index ] );
+}
+
+add_action( 'admin_init', 'add_disable_site_editor_setting' );

quadrat/block-templates/index.html

@@ -0,0 +1 @@
+<!-- wp:template-part {"slug":"index"} /-->