Fix caret position when line contains tabs

Author: florentx

CHANGES.txt

@@ -19,6 +19,8 @@ Bug fixes:
 
 * Fix E501 not detected in comments with Python 2.5.
 
+* Fix caret position with ``--show-source`` when line contains tabs.
+
 
 1.5.1 (2014-03-27)
 ------------------

pep8.py

@@ -1600,7 +1600,7 @@ def get_file_results(self):
                 else:
                     line = self.lines[line_number - 1]
                 print(line.rstrip())
-                print(' ' * offset + '^')
+                print(re.sub(r'\S', ' ', line[:offset]) + '^')
             if self._show_pep8 and doc:
                 print('    ' + doc.strip())
         return self.file_errors