add active source to help tab

Author: crstauf

classes/ActionScheduler_AdminView.php

@@ -251,6 +251,8 @@ public function add_help_tabs() {
 		}
 
 		$as_version = ActionScheduler_Versions::instance()->latest_version();
+		$as_source  = ActionScheduler_Versions::instance()->active_source();
+
 		$screen->add_help_tab(
 			array(
 				'id'      => 'action_scheduler_about',
@@ -261,6 +263,11 @@ public function add_help_tabs() {
 					'<p>' .
 						__( 'Action Scheduler is a scalable, traceable job queue for background processing large sets of actions. Action Scheduler works by triggering an action hook to run at some time in the future. Scheduled actions can also be scheduled to run on a recurring schedule.', 'action-scheduler' ) .
 					'</p>' .
+					'<h3>' . esc_html__( 'Source', 'action-scheduler' ) . '</h3>' .
+					'<p>' .
+						esc_html__( 'Because Action Scheduler can be included as a library in plugins and themes, the code block below indicates from where Action Scheduler is being loaded.', 'action-scheduler' ) .
+					'</p>' .
+					'<p><code>' . $as_source . '</code></p>' .
 					'<h3>' . esc_html__( 'WP CLI', 'action-scheduler' ) . '</h3>' .
 					'<p>' .
 						sprintf(

classes/ActionScheduler_Versions.php

@@ -86,4 +86,8 @@ public static function initialize_latest_version() {
 		$self = self::instance();
 		call_user_func( $self->latest_version_callback() );
 	}
+
+	public function active_source() {
+		return trailingslashit( dirname( __DIR__ ) );
+	}
 }