context: add a fast-comparision for arbitraryfilectx and workingfilectx
Differential Revision: https://phab.mercurial-scm.org/D1056
--- a/mercurial/context.py Fri Oct 13 04:02:06 2017 +0530
+++ b/mercurial/context.py Fri Oct 13 12:40:05 2017 -0700
@@ -8,6 +8,7 @@
from __future__ import absolute_import
import errno
+import filecmp
import os
import re
import stat
@@ -2554,11 +2555,17 @@
"""Allows you to use filectx-like functions on a file in an arbitrary
location on disk, possibly not in the working directory.
"""
- def __init__(self, path):
+ def __init__(self, path, repo=None):
+ # Repo is optional because contrib/simplemerge uses this class.
+ self._repo = repo
self._path = path
- def cmp(self, otherfilectx):
- return self.data() != otherfilectx.data()
+ def cmp(self, fctx):
+ if isinstance(fctx, workingfilectx) and self._repo:
+ # Add a fast-path for merge if both sides are disk-backed.
+ # Note that filecmp uses the opposite return values as cmp.
+ return not filecmp.cmp(self.path(), self._repo.wjoin(fctx.path()))
+ return self.data() != fctx.data()
def path(self):
return self._path