Add lenses for OpCodes

...to simplify manipulation of them.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>

Makefile.am

@@ -134,6 +134,7 @@ HS_DIRS = \
 	src/Ganeti/Monitoring \
 	src/Ganeti/Metad \
 	src/Ganeti/Objects \
+	src/Ganeti/OpCodes \
 	src/Ganeti/Query \
 	src/Ganeti/Storage \
 	src/Ganeti/Storage/Diskstats \
@@ -801,6 +802,7 @@ HS_LIB_SRCS = \
 	src/Ganeti/Objects.hs \
 	src/Ganeti/Objects/Lens.hs \
 	src/Ganeti/OpCodes.hs \
+	src/Ganeti/OpCodes/Lens.hs \
 	src/Ganeti/OpParams.hs \
 	src/Ganeti/Path.hs \
 	src/Ganeti/Parsers.hs \

src/Ganeti/OpCodes/Lens.hs

+{-# LANGUAGE TemplateHaskell #-}
+
+{-| Lenses for OpCodes
+
+-}
+
+{-
+
+Copyright (C) 2014 Google Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.
+
+-}
+
+module Ganeti.OpCodes.Lens where
+
+import Ganeti.Lens (makeCustomLenses)
+import Ganeti.OpCodes
+
+$(makeCustomLenses ''MetaOpCode)
+$(makeCustomLenses ''CommonOpParams)
+