# HG changeset patch
# User Jesse Glick <jesse.glick@oracle.com>
# Date 2012-05-04 19:54:55
# Node ID 9a21fc2c7d323078442d0386b3f2b390aec5c8e4
# Parent  98a9266db80306efe6994d972f7962fe8aeb51c4

localrepo: optimize internode status calls using match.always

Introduce match.always() to check if a match object always says yes, i.e.
None was passed in. If so, mfmatches should not bother iterating every file in
the repository.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1333,6 +1333,8 @@ class localrepository(repo.repository):
 
         def mfmatches(ctx):
             mf = ctx.manifest().copy()
+            if match.always():
+                return mf
             for fn in mf.keys():
                 if not match(fn):
                     del mf[fn]
diff --git a/mercurial/match.py b/mercurial/match.py
--- a/mercurial/match.py
+++ b/mercurial/match.py
@@ -118,6 +118,8 @@ class match(object):
         return self._files
     def anypats(self):
         return self._anypats
+    def always(self):
+        return False
 
 class exact(match):
     def __init__(self, root, cwd, files):
@@ -126,6 +128,8 @@ class exact(match):
 class always(match):
     def __init__(self, root, cwd):
         match.__init__(self, root, cwd, [])
+    def always(self):
+        return True
 
 class narrowmatcher(match):
     """Adapt a matcher to work on a subdirectory only.