# HG changeset patch
# User Mads Kiilerich <madski@unity3d.com>
# Date 2014-12-15 13:47:36
# Node ID 960248c6e021a0883d31787c26b6ec122767ab83
# Parent  ed4a3c0fe61a9bea4b07a152f7a7faa62876d2e9

diff: preserve leading space on empty lines - don't match in re if we don't plan to replace

Fix invisible bug from 7c094db329b3, exposed by future exact parsing of diffs.

diff --git a/kallithea/lib/diffs.py b/kallithea/lib/diffs.py
--- a/kallithea/lib/diffs.py
+++ b/kallithea/lib/diffs.py
@@ -194,7 +194,7 @@ class DiffProcessor(object):
     #used for inline highlighter word split
     _token_re = re.compile(r'()(&gt;|&lt;|&amp;|<u>\t</u>| <i></i>|\W+?)')
 
-    _escape_re = re.compile(r'(&)|(<)|(>)|(\t)|( \n| $)')
+    _escape_re = re.compile(r'(&)|(<)|(>)|(\t)|(?<=.)( \n| $)')
 
 
     def __init__(self, diff, vcs='hg', format='gitdiff', diff_limit=None):
@@ -261,8 +261,9 @@ class DiffProcessor(object):
                 return '&gt;'
             if groups[3]:
                 return '<u>\t</u>'
-            if groups[4] and m.start(): # skip 1st column with +/-
+            if groups[4]:
                 return ' <i></i>'
+            assert False
 
         return self._escape_re.sub(substitute, safe_unicode(string))