[patch] syntax:plain for .hgignore

[Johannes Hofmann]

In a project at work we have a large repository with many generated
files that have no specific extension (mostly executables).
Therefore the .hgignore file is pretty large (more than 500 lines).
In this setup "syntax:plain" (see patch below) speeds up hg status 
from 2.5s to about 1s.
I'm not really familiar with python so this can probabely done more
elegantly.

  Johannes



diff --git a/mercurial/ignore.py b/mercurial/ignore.py
--- a/mercurial/ignore.py
+++ b/mercurial/ignore.py
@@ -41,7 +41,7 @@ def ignore(root, files, warn):
     glob:pattern   # non-rooted glob
     pattern        # pattern of the current default type'''
 
-    syntaxes = {'re': 'relre:', 'regexp': 'relre:', 'glob': 'relglob:'}
+    syntaxes = {'re': 'relre:', 'regexp': 'relre:', 'glob': 'relglob:', 'plain': 'plain:'}
     pats = {}
     for f in files:
         try:
diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -271,7 +271,7 @@ def patkind(name, dflt_pat='glob'):
 def patkind(name, dflt_pat='glob'):
     """Split a string into an optional pattern kind prefix and the
     actual pattern."""
-    for prefix in 're', 'glob', 'path', 'relglob', 'relpath', 'relre':
+    for prefix in 're', 'glob', 'path', 'relglob', 'relpath', 'relre', 'plain':
         if name.startswith(prefix + ':'): return name.split(':', 1)
     return dflt_pat, name
 
@@ -475,8 +475,11 @@ def _matcher(canonroot, cwd, names, inc,
         if not pats:
             return
         try:
+            plainpats = [p for (k,p) in pats if k == 'plain']
+            pats = [(k,p) for (k,p) in pats if not k == 'plain']
             pat = '(?:%s)' % '|'.join([regex(k, p, tail) for (k, p) in pats])
-            return re.compile(pat).match
+            comppat = re.compile(pat)
+            return lambda a : a in plainpats or pats and comppat.match(a)
         except OverflowError:
             # We're using a Python with a tiny regex engine and we
             # made it explode, so we'll divide the pattern list in two
diff --git a/tests/test-hgignore b/tests/test-hgignore
--- a/tests/test-hgignore
+++ b/tests/test-hgignore
@@ -63,5 +63,8 @@ echo "relglob:*" > .hgignore
 echo "relglob:*" > .hgignore
 echo "--" ; hg status
 
+echo "plain:dir/c.o" > .hgignore
+echo "--" ; hg status
+
 cd dir
 echo "--" ; hg status .
diff --git a/tests/test-hgignore.out b/tests/test-hgignore.out
--- a/tests/test-hgignore.out
+++ b/tests/test-hgignore.out
@@ -50,4 +50,10 @@ A dir/b.o
 --
 A dir/b.o
 --
+A dir/b.o
+? .hgignore
+? a.c
+? a.o
+? syntax
+--
 A b.o