From 169db9dbb11027f398730fc7a2888811b4d8a997 Mon Sep 17 00:00:00 2001
From: Scott Taylor <scott.c.taylor@mac.com>
Date: Thu, 24 Sep 2015 21:05:25 +0000
Subject: [PATCH] Comments: add a `'comment_excerpt_length'` filter to
 `get_comment_excerpt()`.

Create the first ever unit tests for `get_comment_excerpt()`.

Props dannydehaan, wonderboymusic.
Fixes #27526.

Built from https://develop.svn.wordpress.org/trunk@34520


git-svn-id: http://core.svn.wordpress.org/trunk@34484 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/comment-template.php | 30 +++++++++++++++++-------------
 wp-includes/version.php          |  2 +-
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index f3e55bf03e..06cc26e1f0 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -565,23 +565,27 @@ function comment_date( $d = '', $comment_ID = 0 ) {
  */
 function get_comment_excerpt( $comment_ID = 0 ) {
 	$comment = get_comment( $comment_ID );
-	$comment_text = strip_tags($comment->comment_content);
-	$blah = explode(' ', $comment_text);
+	$comment_text = strip_tags( str_replace( array( "\n", "\r" ), ' ', $comment->comment_content ) );
+	$words = explode( ' ', $comment_text );
 
-	if (count($blah) > 20) {
-		$k = 20;
-		$use_dotdotdot = 1;
-	} else {
-		$k = count($blah);
-		$use_dotdotdot = 0;
+	/**
+	 * Filter the amount of words used in the comment excerpt.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param int $comment_excerpt_length The amount of words you want to display in the comment excerpt.
+	 */
+	$comment_excerpt_length = apply_filters( 'comment_excerpt_length', 20 );
+
+	$use_ellipsis = count( $words ) > $comment_excerpt_length;
+	if ( $use_ellipsis ) {
+		$words = array_slice( $words, 0, $comment_excerpt_length );
 	}
 
-	$excerpt = '';
-	for ($i=0; $i<$k; $i++) {
-		$excerpt .= $blah[$i] . ' ';
+	$excerpt = trim( join( ' ', $words ) );
+	if ( $use_ellipsis ) {
+		$excerpt .= '&hellip;';
 	}
-	$excerpt .= ($use_dotdotdot) ? '&hellip;' : '';
-
 	/**
 	 * Filter the retrieved comment excerpt.
 	 *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 4f1bbd94d8..3bfaee2caa 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34519';
+$wp_version = '4.4-alpha-34520';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.