init

setup.php

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+<?php
+/**
+ * Child theme setup.
+ *
+ * @copyright  WebMan Design, Oliver Juhas
+ */
+
+namespace WebManDesign\Child_Theme;
+
+use WP_Query;
+
+// Exit if accessed directly.
+defined( 'ABSPATH' ) || exit;
+
+class Setup {
+
+	/**
+	 * Stylesheet modification time cache.
+	 *
+	 * @access  public
+	 * @var     string
+	 */
+	public static $stylesheet_filemtime = '';
+
+	/**
+	 * Initialization.
+	 *
+	 * @return  void
+	 */
+	public static function init() {
+
+		// Processing
+
+			self::$stylesheet_filemtime = filemtime( get_theme_file_path( 'style.css' ) );
+
+			add_action( 'wp_enqueue_scripts', __CLASS__ . '::assets' );
+
+			add_action( 'after_switch_theme', __CLASS__ . '::parent_options' );
+
+			add_filter( 'pre_render_block', __CLASS__ . '::block', 0, 2 );
+			add_filter( 'render_block',     __CLASS__ . '::block', 0, 2 );
+
+	} // /init
+
+	/**
+	 * Enqueue parent theme stylesheet.
+	 *
+	 * This runs only if parent theme does not claim support for
+	 * `child-theme-stylesheet`, and so we need to enqueue this
+	 * child theme's `style.css` file ourselves.
+	 *
+	 * If parent theme supports `child-theme-stylesheet`, it enqueues
+	 * this child theme's `style.css` file automatically.
+	 *
+	 * @return  void
+	 */
+	public static function assets() {
+
+		// Requirements check
+
+			if ( current_theme_supports( 'child-theme-stylesheet' ) ) {
+				return;
+			}
+
+
+		// Processing
+
+			// Enqueue parent theme stylesheet.
+			wp_enqueue_style(
+				'parent-theme-style',
+				get_template_directory_uri() . '/style.css',
+				array(),
+				wp_get_theme( get_template() )->get( 'Version' )
+			);
+
+			// Then enqueue the child theme stylesheet.
+			wp_enqueue_style(
+				'child-theme-style',
+				get_stylesheet_uri(),
+				array(),
+				filemtime( get_theme_file_path( 'style.css' ) )
+			);
+
+	} // /assets
+
+	/**
+	 * Copy parent theme options.
+	 *
+	 * @return  void
+	 */
+	public static function parent_options() {
+
+		// Variables
+
+			$child_theme  = get_stylesheet();
+			$parent_theme = get_template();
+
+
+		// Processing
+
+			/**
+			 * Copy theme mods.
+			 *
+			 * WordPress sets default theme mods when a theme is switched.
+			 * It looks like it creates max 4 mod keys during the action.
+			 * So, anything above, we presume child theme mods already
+			 * exist and we don't proceed with copying.
+			 *
+			 * @link  https://developer.wordpress.org/reference/functions/switch_theme/
+			 */
+			if (
+				// Check for existing child theme mods:
+				4 >= count( (array) get_theme_mods() )
+				// Check for WebMan Design child theme mods:
+				&& ! get_theme_mod( '__customize_timestamp' )
+				// Check for this child theme mods (see below):
+				&& ! get_theme_mod( '__switch_theme_timestamp' )
+			) {
+
+				// Get parent theme mods.
+				$parent_theme_mods = get_option( 'theme_mods_' . $parent_theme );
+
+				// Copy parent theme options to our child theme ones.
+				update_option( 'theme_mods_' . $child_theme, $parent_theme_mods );
+
+				// Mark as done for the future.
+				set_theme_mod( '__switch_theme_timestamp', esc_attr( gmdate( 'ymdHis' ) ) );
+			}
+
+			/**
+			 * Copy Site Editor user mods.
+			 *
+			 * Relevant for block or hybrid themes.
+			 */
+			if ( false === get_theme_mod( '__site_editor_mods_copy_timestamp' ) ) {
+
+				$query = new WP_Query( array(
+					'post_status'    => array( 'publish' ),
+					'post_type'      => array( 'wp_template', 'wp_template_part', 'wp_global_styles' ),
+					'posts_per_page' => -1,
+					'no_found_rows'  => true,
+					'tax_query'      => array(
+						array(
+							'taxonomy' => 'wp_theme',
+							'field'    => 'name',
+							'terms'    => $parent_theme,
+						),
+					),
+				) );
+
+				foreach ( $query->posts as $post ) {
+
+					$wp_theme = wp_get_object_terms( $post->ID, 'wp_theme', array( 'fields' => 'slugs' ) );
+
+					if (
+						! empty( $wp_theme )
+						&& ! is_wp_error( $wp_theme )
+						&& in_array( $parent_theme, (array) $wp_theme )
+					) {
+
+						// Add the child theme to `wp_theme` taxonomy terms.
+						$wp_theme   = (array) $wp_theme;
+						$wp_theme[] = $child_theme;
+
+						wp_set_object_terms(
+							$post->ID,
+							$wp_theme,
+							'wp_theme'
+						);
+					}
+				}
+
+				// Mark as done for the future.
+				set_theme_mod( '__site_editor_mods_copy_timestamp', esc_attr( gmdate( 'ymdHis' ) ) );
+			}
+
+	} // /parent_options
+
+	/**
+	 * Make a (Template Part) block work if it has `theme` attribute set.
+	 *
+	 * @param  mixed $render
+	 * @param  array $block
+	 *
+	 * @return  mixed
+	 */
+	public static function block( $render, array $block ) {
+
+		// Requirements check
+
+			if (
+				! isset( $block['attrs']['theme'] )
+				|| get_stylesheet() === $block['attrs']['theme']
+			) {
+				return $render;
+			}
+
+
+		// Processing
+
+			if ( doing_filter( 'pre_render_block' ) ) {
+				add_filter( 'stylesheet', __CLASS__ . '::set_stylesheet_parent' );
+			} else {
+				remove_filter( 'stylesheet', __CLASS__ . '::set_stylesheet_parent' );
+			}
+
+
+		// Output
+
+			return $render;
+
+	} // /block
+
+	/**
+	 * Change stylesheet to template.
+	 *
+	 * @param  string $stylesheet
+	 *
+	 * @return  string
+	 */
+	public static function set_stylesheet_parent( string $stylesheet ): string {
+
+		// Requirements check
+
+			// Make sure we don't screw up the assets enqueuing.
+			if ( doing_action( 'wp_enqueue_scripts' ) ) {
+				return $stylesheet;
+			}
+
+
+		// Output
+
+			return (string) get_template();
+
+	} // /set_stylesheet_parent
+
+}
+
+Setup::init();