# HG changeset patch
# User Jun Wu <quark@fb.com>
# Date 1533687421 25200
# Node ID 32b1967b873445ac215ea3f381075dcf51a10f29
# Parent  1601afbb573c771c5943256debe3c36718f4c6d4
linelog: extract `len(self._program)` to a local function

This is a micro optimization prepared for following changes where
`len(self._program)` is used in a loop.

Differential Revision: https://phab.mercurial-scm.org/D4149

diff -r 1601afbb573c -r 32b1967b8734 mercurial/linelog.py
--- a/mercurial/linelog.py	Mon Aug 06 18:56:24 2018 -0700
+++ b/mercurial/linelog.py	Tue Aug 07 17:17:01 2018 -0700
@@ -308,7 +308,8 @@
         else:
             a1info = ar.lines[a1]
             a1inst = self._program[a1info._offset]
-        oldproglen = len(self._program)
+        programlen = self._program.__len__
+        oldproglen = programlen()
         appendinst = self._program.append
 
         # insert