# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-10-06 21:42:00
# Node ID fcd12b3101483e8f6418f82f7ef7f32bc411e61d
# Parent  c1fd827e1ae0614a02fd8a7e34ce0b7f9bf32b46

baseset: implement `first` and `last` methods

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2387,6 +2387,16 @@ class baseset(list, abstractsmartset):
         This is part of the mandatory API for smartset."""
         return False
 
+    def first(self):
+        if self:
+            return self[0]
+        return None
+
+    def last(self):
+        if self:
+            return self[-1]
+        return None
+
 class filteredset(abstractsmartset):
     """Duck type for baseset class which iterates lazily over the revisions in
     the subset and contains a function which tests for membership in the