[PATCH 1 of 1] context: cmp via filelog only when filename matches _encodefilterpats

[Christian Ebert]

# HG changeset patch
# User Christian Ebert <blacktrash at gmx.net>
# Date 1287574804 -3600
# Node ID 35a316fe68561cf402d0aaf6cf417e366718d475
# Parent  614f0d8724ab9cc49fba959a9f23845827f5c02b
context: cmp via filelog only when filename matches _encodefilterpats

Extra costs:
- no encode/decode filters configured:
  1. fctx.path()
  2. loop over empty _encodefilterpats list
- encode/decode filters configured:
  at least 1 match function per file

The change therefore favours users who have a low ratio of
encode/decode enabled vs. disabled files configured.

Also do the same for hgext.keyword's monkeypatch.

diff --git a/hgext/keyword.py b/hgext/keyword.py
--- a/hgext/keyword.py
+++ b/hgext/keyword.py
@@ -594,10 +594,16 @@
     def kwfilectx_cmp(orig, self, fctx):
         # keyword affects data size, comparing wdir and filelog size does
         # not make sense
-        if (fctx._filerev is None and
-            (self._repo._encodefilterpats or
-             kwt.match(fctx.path()) and not 'l' in fctx.flags()) or
-            self.size() == fctx.size()):
+        fmatch = False
+        if fctx._filerev is None:
+            path = fctx.path()
+            for mf, fn, cmd in self._repo._encodefilterpats:
+                if mf(path):
+                    fmatch = True
+                    break
+            if not fmatch:
+                fmatch = kwt.match(path) and not 'l' in fctx.flags()
+        if fmatch or self.size() == fctx.size():
             return self._filelog.cmp(self._filenode, fctx.data())
         return True
 
diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -357,8 +357,14 @@
 
         returns True if different than fctx.
         """
-        if (fctx._filerev is None and self._repo._encodefilterpats
-            or self.size() == fctx.size()):
+        fmatch = False
+        if fctx._filerev is None:
+            path = fctx.path()
+            for mf, fn, cmd in self._repo._encodefilterpats:
+                if mf(path):
+                    fmatch = True
+                    break
+        if fmatch or self.size() == fctx.size():
             return self._filelog.cmp(self._filenode, fctx.data())
 
         return True