# HG changeset patch
# User Idan Kamara <idankk86@gmail.com>
# Date 1352741223 -7200
# Node ID 1e6b5faf9d4ecc3022e207135e742468467c9b8f
# Parent  7f5dab94e48cea28a1a7c6a296d7c07eed5d1db7
grep: don't search past the end of the searched string

'*' causes the resulting RE to match 0 or more repetitions of the preceding RE:

>>> bool(re.search('.*', ''))
>>> True

This causes an infinite loop because currently we're only checking if there was
a match without looking at where we are in the searched string.

diff -r 7f5dab94e48c -r 1e6b5faf9d4e mercurial/commands.py
--- a/mercurial/commands.py	Wed Nov 07 16:21:39 2012 -0600
+++ b/mercurial/commands.py	Mon Nov 12 19:27:03 2012 +0200
@@ -2936,7 +2936,7 @@
     def matchlines(body):
         begin = 0
         linenum = 0
-        while True:
+        while True and begin < len(body):
             match = regexp.search(body, begin)
             if not match:
                 break
diff -r 7f5dab94e48c -r 1e6b5faf9d4e tests/test-grep.t
--- a/tests/test-grep.t	Wed Nov 07 16:21:39 2012 -0600
+++ b/tests/test-grep.t	Mon Nov 12 19:27:03 2012 +0200
@@ -23,6 +23,10 @@
 
 simple
 
+  $ hg grep '.*'
+  port:4:export
+  port:4:vaportight
+  port:4:import/export
   $ hg grep port port
   port:4:export
   port:4:vaportight