add reflog

Git/RefLog.hs

@@ -0,0 +1,23 @@
+{- git reflog interface
+ -
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Git.RefLog where
+
+import Common
+import Git
+import Git.Command
+import Git.Sha
+import Git.CatFile
+
+{- Gets the reflog for a given branch. -}
+get :: Branch -> Repo -> IO [Sha]
+get b = mapMaybe extractSha . lines <$$> pipeReadStrict
+	[ Param "log"
+	, Param "-g"
+	, Param "--format=%H"
+	, Param (show b)
+	]