# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 1428466103 25200
# Node ID 4eaea0ed8dc10fc796c86e45e132ec2c10b6930c
# Parent  aef3d14697732709084408ff126d9ea7a4a9cc8f
manifest.walk: special-case match.always() for speed

This cuts down the run time of

  hg files -r . > /dev/null

from ~0.850s to ~0.780s on the Firefox repo. Note that
manifest.matches() already has the corresponding optimization.

diff -r aef3d1469773 -r 4eaea0ed8dc1 mercurial/manifest.py
--- a/mercurial/manifest.py	Tue Apr 07 22:36:17 2015 -0700
+++ b/mercurial/manifest.py	Tue Apr 07 21:08:23 2015 -0700
@@ -222,6 +222,11 @@
 
         It also reports nonexistent files by marking them bad with match.bad().
         '''
+        if match.always():
+            for f in iter(self):
+                yield f
+            return
+
         fset = set(match.files())
 
         # avoid the entire walk if we're only looking for specific files
@@ -607,6 +612,11 @@
 
         It also reports nonexistent files by marking them bad with match.bad().
         '''
+        if match.always():
+            for f in iter(self):
+                yield f
+            return
+
         fset = set(match.files())
 
         for fn in self._walk(match):