diff -r 47d10459fa24 -r ebd286f06879 hgext/evolve.py
--- a/hgext/evolve.py	Tue Jun 26 16:12:52 2012 +0200
+++ b/hgext/evolve.py	Sat Jun 23 19:24:37 2012 +0200
@@ -564,7 +564,8 @@
         ds.copy(src, dst)
 
 @command('^uncommit',
-    [] + commands.walkopts,
+    [('a', 'all', None, _('uncommit all changes when no arguments given')),
+     ] + commands.walkopts,
     _('[OPTION]... [NAME]'))
 def uncommit(ui, repo, *pats, **opts):
     """move changes from parent revision to working directory
@@ -597,7 +598,8 @@
             updatebookmarks = _bookmarksupdater(repo, old.node())
             # Recommit the filtered changeset
             newid = None
-            if pats or opts.get('include') or opts.get('exclude'):
+            if (pats or opts.get('include') or opts.get('exclude')
+                or opts.get('all')):
                 match = scmutil.match(old, pats, opts)
                 newid = _commitfiltered(repo, old, match)
             if newid is None: