/**
  * Get the fork's parent post, set up a query, and load correct template.
  *
  * Duplicates the functionality of /wp-includes/template-loader.php and includes
  * a lot of copypasta, but that's only to ensure that it follows the same logic.
  *
  */
 function choose_template()
 {
     $p = get_queried_object_id();
     if (get_post_type($p) !== 'fork') {
         return;
     }
     $pp = get_post($p)->post_parent;
     $parent = get_post($pp);
     if ($parent->post_type == 'page') {
         $query = array('page_id' => $pp);
     } else {
         $query = array('p' => $pp);
     }
     $t = new WP_Query($query);
     $template = false;
     if ($t->is_404() && ($template = get_404_template())) {
     } elseif ($t->is_search() && ($template = get_search_template())) {
     } elseif ($t->is_tax() && ($template = get_taxonomy_template())) {
     } elseif ($t->is_front_page() && ($template = get_front_page_template())) {
     } elseif ($t->is_home() && ($template = get_home_template())) {
     } elseif ($t->is_attachment() && ($template = get_attachment_template())) {
         remove_filter('the_content', 'prepend_attachment');
     } elseif ($t->is_single() && ($template = get_single_template())) {
     } elseif ($t->is_page && ($template = get_page_template())) {
     } elseif ($t->is_category() && ($template = get_category_template())) {
     } elseif ($t->is_tag() && ($template = get_tag_template())) {
     } elseif ($t->is_author() && ($template = get_author_template())) {
     } elseif ($t->is_date() && ($template = get_date_template())) {
     } elseif ($t->is_archive() && ($template = get_archive_template())) {
     } elseif ($t->is_comments_popup() && ($template = get_comments_popup_template())) {
     } elseif ($t->is_paged() && ($template = get_paged_template())) {
     } else {
         $template = get_index_template();
     }
     if ($template = apply_filters('template_include', $template)) {
         include $template;
     }
     return;
 }