/**
* Constructor, load parent constructor and set up caches.
*/
protected function __construct()
{
parent::__construct();
//* Whether we're using pretty permalinks.
$this->pretty_permalinks = '' !== $this->permalink_structure();
/**
* Add query strings to rewrite
*/
add_action('init', array($this, 'rewrite_rule_sitemap'), 1);
add_filter('query_vars', array($this, 'enqueue_sitemap_query_vars'), 1);
/**
* Adding a higher priority will cause a trailing slash to be added.
* We need to be in front of the queue to prevent this from happening.
*/
add_action('template_redirect', array($this, 'maybe_output_sitemap'), 1);
//* Edit the robots.txt file
add_filter('robots_txt', array($this, 'robots_txt'), 10, 2);
//* Enqueue rewrite flush
add_action('shutdown', array($this, 'maybe_flush_rewrite'), 999);
}