# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 2008-05-12 16:37:08
# Node ID 7fe4610cf9208d66bbf5b0a61ddba00b19a2d0df
# Parent  99a92acafdb93cbfc2b24f62a81833c6535f777e

match: add always, never, and exact methods

diff --git a/mercurial/match.py b/mercurial/match.py
--- a/mercurial/match.py
+++ b/mercurial/match.py
@@ -34,3 +34,18 @@ class match(object):
         return self._files
     def anypats(self):
         return self._anypats
+
+def always(root, cwd):
+    return match(root, cwd, [], None, None, 'relpath')
+
+def never(root, cwd):
+    m = match(root, cwd, [], None, None, 'relpath')
+    m._matchfn = lambda f: False
+    return m
+
+def exact(root, cwd, files):
+    m = always(root, cwd)
+    m._files = files
+    m._fmap = dict.fromkeys(files)
+    m._matchfn = m._fmap.has_key
+    return m