# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1426329539 -32400
# Node ID 56fff44cce98e3e2ef1e596a5d712ec36dd858b2
# Parent  85219d6ece678fdc82f49006aeda26e6e21ed220
scmutil: add function to help handling workingctx in arithmetic operation

It's unfortunate that workingctx revision is None, which doesn't work well in
arithmetic operation or comparison. This function is trivial but will be used
in several places.

diff -r 85219d6ece67 -r 56fff44cce98 mercurial/scmutil.py
--- a/mercurial/scmutil.py	Thu Apr 02 08:18:33 2015 +0200
+++ b/mercurial/scmutil.py	Sat Mar 14 19:38:59 2015 +0900
@@ -582,6 +582,13 @@
             _rcpath = osrcpath()
     return _rcpath
 
+def intrev(repo, rev):
+    """Return integer for a given revision that can be used in comparison or
+    arithmetic operation"""
+    if rev is None:
+        return len(repo)
+    return rev
+
 def revsingle(repo, revspec, default='.'):
     if not revspec and revspec != 0:
         return repo[default]