# HG changeset patch
# User Lucas Moscovicz <lmoscovicz@fb.com>
# Date 2014-03-14 16:07:59
# Node ID fa1ac5faa7c4613bc4a627aabb8b9fdf9378e00e
# Parent  41e1064486f96bd2761acf85e197e627346c292e

revset: added __nonzero__ method to spanset class

Implemented it in a lazy way, just look for the first non-filtered revision
and return True if there's any revision at all.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2490,6 +2490,11 @@ class spanset(object):
         return self._contained(x) and not (self._hiddenrevs and rev in
                 self._hiddenrevs)
 
+    def __nonzero__(self):
+        for r in self:
+            return True
+        return False
+
     def __and__(self, x):
         if isinstance(x, baseset):
             x = x.set()