# HG changeset patch
# User Sean Farley <sean.michael.farley@gmail.com>
# Date 2013-01-23 06:12:52
# Node ID ac0c12123743b659bc933e859d408676d05c63e0
# Parent  3aa8b4b36b6487ae5690ac62561536a7ed30cb6b

log: remove any ancestors of nullrev (issue3772)

For the special case, ":null" we remove the implied revision 0 since that
wouldn't make any sense here. A test case is added to make sure only nullrev is
shown.

diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -6,6 +6,7 @@
 # GNU General Public License version 2 or any later version.
 
 from i18n import _
+from mercurial.node import nullrev
 import util, error, osutil, revset, similar, encoding, phases
 import match as matchmod
 import os, errno, re, stat, sys, glob
@@ -647,6 +648,8 @@ def revrange(repo, revs):
                 start, end = spec.split(_revrangesep, 1)
                 start = revfix(repo, start, 0)
                 end = revfix(repo, end, len(repo) - 1)
+                if end == nullrev and start <= 0:
+                    start = nullrev
                 rangeiter = repo.changelog.revs(start, end)
                 if not seen and not l:
                     # by far the most common case: revs = ["-1:0"]
diff --git a/tests/test-log.t b/tests/test-log.t
--- a/tests/test-log.t
+++ b/tests/test-log.t
@@ -1296,4 +1296,13 @@ test hg log on non-existent files and on
   changeset:   0:65624cd9070a
   $ hg log -l1 .d6/f1 | grep changeset
   changeset:   0:65624cd9070a
+
+issue3772: hg log -r :null showing revision 0 as well
+
+  $ hg log -r :null
+  changeset:   -1:000000000000
+  user:        
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  
+
   $ cd ..