# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 2008-02-11 22:13:43
# Node ID 59a9dc9562e24d5e5890c7d957ef2b91cb12e8a0
# Parent  89c70d496175b2e359161a85a66e59fcc0f53012

ignore: split up huge patterns

Some versions of Python silently mishandle large regexes, so split
them up at a conservative 20k.

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -459,6 +459,8 @@ def _matcher(canonroot, cwd, names, inc,
             return
         try:
             pat = '(?:%s)' % '|'.join([regex(k, p, tail) for (k, p) in pats])
+            if len(pat) > 20000:
+                raise OverflowError()
             return re.compile(pat).match
         except OverflowError:
             # We're using a Python with a tiny regex engine and we