From bb651899b192e53ddfad7a40dce1a0561571bd1e Mon Sep 17 00:00:00 2001
From: Toby Zerner <toby.zerner@gmail.com>
Date: Wed, 17 Jun 2015 18:22:14 +0930
Subject: [PATCH] Extract into truncate helper

---
 js/forum/src/components/post-preview.js | 3 ++-
 js/lib/utils/truncate.js                | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 js/lib/utils/truncate.js

diff --git a/js/forum/src/components/post-preview.js b/js/forum/src/components/post-preview.js
index 30ace129a..ec94e721e 100644
--- a/js/forum/src/components/post-preview.js
+++ b/js/forum/src/components/post-preview.js
@@ -3,6 +3,7 @@ import avatar from 'flarum/helpers/avatar';
 import username from 'flarum/helpers/username';
 import humanTime from 'flarum/helpers/human-time';
 import highlight from 'flarum/helpers/highlight';
+import truncate from 'flarum/utils/truncate';
 
 export default class PostPreview extends Component {
   view() {
@@ -17,7 +18,7 @@ export default class PostPreview extends Component {
       start = Math.max(0, excerpt.search(regexp) - 100);
     }
 
-    excerpt = (start > 0 ? '...' : '')+excerpt.substring(start, start + 200)+(excerpt.length > start + 200 ? '...' : '');
+    excerpt = truncate(excerpt, 200, start);
 
     if (this.props.highlight) {
       excerpt = highlight(excerpt, regexp);
diff --git a/js/lib/utils/truncate.js b/js/lib/utils/truncate.js
new file mode 100644
index 000000000..e59286fd9
--- /dev/null
+++ b/js/lib/utils/truncate.js
@@ -0,0 +1,5 @@
+export default function truncate(string, length, start) {
+  start = start || 0;
+
+  return (start > 0 ? '...' : '')+string.substring(start, start + length)+(string.length > start + length ? '...' : '');
+}