Search Equipment

gistfile1.txt

function search_filter($query) {
  if ( !is_admin() && $query->is_main_query() ) {
    if ($query->is_search) {
      $query->set( 'post_type', array( 'listing' ) );
      $query->set( 'posts_per_page', -1 );
    }
  }
}

add_action('pre_get_posts','search_filter');