Add uninstall hook to remove ticks and tickers

includes/class-wpliveticker2-system.php

@@ -39,4 +39,37 @@ class WPLiveticker2_System extends WPLiveticker2 {
 			add_option( self::OPTION, $defaults );
 		}
 	}
+
+	/**
+	 * Plugin uninstall handler.
+	 *
+	 * @return void
+	 */
+	public static function uninstall() {
+		// Delete all ticks.
+		$ticks = new WP_Query( array( 'post_type' => 'wplt2_tick' ) );
+		foreach ( $ticks->get_posts() as $tick ) {
+			wp_delete_post( $tick->ID, true );
+		}
+
+		// Temporarily register taxonomy to delete it.
+		register_taxonomy( 'wplt2_ticker', array( 'wplt2_tick' ) );
+
+		// Delete tickers.
+		$tickers = get_terms(
+			array(
+				'taxonomy'   => 'wplt2_ticker',
+				'hide_empty' => false,
+			)
+		);
+		foreach ( $tickers as $ticker ) {
+			wp_delete_term( $ticker->term_id, 'wplt2_ticker' );
+		}
+
+		// Unregister taxonomy again.
+		unregister_taxonomy( 'wplt2_ticker' );
+
+		// Delete the option.
+		delete_option( self::OPTION );
+	}
 }