From 2310bf2ab6ea7c89887677fb69b4311d784a60f4 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Thu, 20 Nov 2008 19:08:41 +0000
Subject: [PATCH] Add threaded comment info to atom feed. Props dtsn. fixes
 #8292

git-svn-id: https://develop.svn.wordpress.org/trunk@9818 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/feed-atom-comments.php | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/wp-includes/feed-atom-comments.php b/wp-includes/feed-atom-comments.php
index e7c3c7cba6..9b533fcd4b 100644
--- a/wp-includes/feed-atom-comments.php
+++ b/wp-includes/feed-atom-comments.php
@@ -66,11 +66,20 @@ if ( have_comments() ) : while ( have_comments() ) : the_comment();
 		<id><?php comment_link(); ?></id>
 		<updated><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_comment_time('Y-m-d H:i:s', true), false); ?></updated>
 		<published><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_comment_time('Y-m-d H:i:s', true), false); ?></published>
-<?php if (!empty($comment_post->post_password) && $_COOKIE['wp-postpass'] != $comment_post->post_password) : ?>
+<?php if ( post_password_required() ) : ?>
 		<content type="html" xml:base="<?php comment_link(); ?>"><![CDATA[<?php echo get_the_password_form(); ?>]]></content>
 <?php else : // post pass ?>
 		<content type="html" xml:base="<?php comment_link(); ?>"><![CDATA[<?php comment_text(); ?>]]></content>
 <?php endif; // post pass
+	// Return comment threading information (http://www.ietf.org/rfc/rfc4685.txt)
+	if ( $comment->comment_parent == 0 ) : // This comment is top level ?>
+		<thr:in-reply-to rel="<?php the_guid() ?>" href="<?php the_permalink_rss() ?>" type="<?php bloginfo_rss('html_type'); ?>" />
+<?php else : // This comment is in reply to another comment
+	$parent_comment = get_comment($comment->comment_parent);
+	// The rel attribute below and the id tag above should be GUIDs, but WP doesn't create them for comments (unlike posts). Either way, its more important that they both use the same system
+?>
+		<thr:in-reply-to rel="<?php echo get_comment_link($parent_comment) ?>" href="<?php echo get_comment_link($parent_comment) ?>" type="<?php bloginfo_rss('html_type'); ?>" />
+<?php endif;
 	do_action('comment_atom_entry', $comment->comment_ID, $comment_post->ID);
 ?>
 	</entry>