Add m2 to m3 typography migration

plugin/php/class-migration.php

@@ -0,0 +1,99 @@
+<?php
+/**
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @package MaterialDesign
+ */
+
+/**
+ * Bootstraps migration scripts.
+ *
+ * @package MaterialDesign
+ */
+
+namespace MaterialDesign\Plugin;
+
+/**
+ * Migration class.
+ */
+class Migration extends Module_Base {
+
+	const MIGRATION_KEY = 'material_m2_to_m3_migration';
+
+	/**
+	 * Initiate the class and hooks.
+	 */
+	public function init() {
+		add_action( 'admin_init', [ $this, 'migrate_m2_typography_settings_to_m3' ], 10, 2 );
+	}
+
+	/**
+	 * Migrate m2 typography settings to m3.
+	 *
+	 * @return void
+	 */
+	public function migrate_m2_typography_settings_to_m3() {
+		$migration_option = get_option( self::MIGRATION_KEY, [] );
+
+		if ( ! empty( $migration_option['typography'] ) ) {
+			return;
+		}
+
+		$map = [
+			'headline_1'       => 'display_small',
+			'headline_2'       => 'headline_large',
+			'headline_3'       => 'headline_medium',
+			'headline_4'       => 'headline_small',
+			'headline_5'       => 'title_large',
+			'headline_6'       => 'title_large',
+			'subhead_1'        => 'title_medium',
+			'subhead_2'        => 'title_small',
+			'body_1'           => 'body_large',
+			'body_2'           => 'body_medium',
+			'caption'          => 'body_small',
+			'button'           => 'label_large',
+			'overline'         => 'label_medium',
+			'subtitle_1'       => 'label_large',
+			'subtitle_2'       => 'label_medium',
+			'head_font_family' => [ 'display_font_family', 'headline_font_family' ],
+		];
+
+		$slug = $this->plugin->customizer_controls->slug;
+
+		$option = get_option( $slug, [] );
+
+		foreach ( $map as $m2_key => $m3_key ) {
+			if ( is_array( $m3_key ) ) {
+				foreach ( $m3_key as $sub_m3_key ) {
+					if ( isset( $option[ $m2_key ] ) ) {
+						$option[ $sub_m3_key ] = $option[ $m2_key ];
+					}
+				}
+				unset( $option[ $m2_key ] );
+			} else {
+				if ( isset( $option[ $m2_key ] ) ) {
+					$option[ $m3_key ] = $option[ $m2_key ];
+					unset( $option[ $m2_key ] );
+				}
+			}
+		}
+
+		update_option( $slug, $option );
+
+		$migration_option['typography'] = true;
+		update_option( self::MIGRATION_KEY, $migration_option );
+	}
+
+}

plugin/php/class-plugin.php

@@ -145,6 +145,13 @@ class Plugin extends Plugin_Base {
 	 */
 	public $frontend;
 
+	/**
+	 * Migration class.
+	 *
+	 * @var Migration
+	 */
+	public $migration;
+
 	/**
 	 * Initiate the plugin resources.
 	 *
@@ -189,6 +196,9 @@ public function init() {
 		$this->frontend = new Frontend( $this );
 		$this->frontend->init();
 
+		$this->migration = new Migration( $this );
+		$this->migration->init();
+
 		// Init CLI.
 		if ( defined( 'WP_CLI' ) && false !== WP_CLI ) {
 			$this->fonts = new Fonts();