# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 2018-02-05 19:36:51
# Node ID fa15a70f88deac245ad2a17b3eeb1068929c6d5f
# Parent  0ff41ced4c121a0de488977a2bafbdcad3eaace0

changelog: implement context manager method for 'appender' object

This object mimics a file and was missing the context manager API.

diff --git a/mercurial/changelog.py b/mercurial/changelog.py
--- a/mercurial/changelog.py
+++ b/mercurial/changelog.py
@@ -127,6 +127,13 @@ class appender(object):
         self.offset += len(s)
         self._end += len(s)
 
+    def __enter__(self):
+        self.fp.__enter__()
+        return self
+
+    def __exit__(self, *args):
+        return self.fp.__exit__(*args)
+
 def _divertopener(opener, target):
     """build an opener that writes in 'target.a' instead of 'target'"""
     def _divert(name, mode='r', checkambig=False):