diff --git a/rhodecode/lib/vcs/backends/base.py b/rhodecode/lib/vcs/backends/base.py
--- a/rhodecode/lib/vcs/backends/base.py
+++ b/rhodecode/lib/vcs/backends/base.py
@@ -10,16 +10,18 @@
 """
 
 import datetime
-from itertools import chain
+import itertools
+
 from rhodecode.lib.vcs.utils import author_name, author_email
 from rhodecode.lib.vcs.utils.lazy import LazyProperty
 from rhodecode.lib.vcs.utils.helpers import get_dict_for_attrs
 from rhodecode.lib.vcs.conf import settings
 
-from rhodecode.lib.vcs.exceptions import ChangesetError, EmptyRepositoryError, \
-    NodeAlreadyAddedError, NodeAlreadyChangedError, NodeAlreadyExistsError, \
-    NodeAlreadyRemovedError, NodeDoesNotExistError, NodeNotChangedError, \
-    RepositoryError
+from rhodecode.lib.vcs.exceptions import (
+    ChangesetError, EmptyRepositoryError, NodeAlreadyAddedError,
+    NodeAlreadyChangedError, NodeAlreadyExistsError, NodeAlreadyRemovedError,
+    NodeDoesNotExistError, NodeNotChangedError, RepositoryError
+)
 
 
 class BaseRepository(object):
@@ -80,6 +82,13 @@ class BaseRepository(object):
     def __len__(self):
         return self.count()
 
+    def __eq__(self, other):
+        same_instance = isinstance(other, self.__class__)
+        return same_instance and getattr(other, 'path', None) == self.path
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     @LazyProperty
     def alias(self):
         for k, v in settings.BACKENDS.items():
@@ -844,7 +853,7 @@ class BaseInMemoryChangeset(object):
         Returns generator of paths from nodes marked as added, changed or
         removed.
         """
-        for node in chain(self.added, self.changed, self.removed):
+        for node in itertools.chain(self.added, self.changed, self.removed):
             yield node.path
 
     def get_paths(self):
@@ -995,3 +1004,27 @@ class EmptyChangeset(BaseChangeset):
 
     def get_file_size(self, path):
         return 0
+
+
+class CollectionGenerator(object):
+
+    def __init__(self, repo, revs):
+        self.repo = repo
+        self.revs = revs
+
+    def __len__(self):
+        return len(self.revs)
+
+    def __iter__(self):
+        for rev in self.revs:
+            yield self.repo.get_changeset(rev)
+
+    def __getslice__(self, i, j):
+        """
+        Returns a iterator of sliced repository
+        """
+        sliced_revs = self.revs[i:j]
+        return CollectionGenerator(self.repo, sliced_revs)
+
+    def __repr__(self):
+        return 'CollectionGenerator<%s>' % (len(self))