add describe subcommand

Command/Describe.hs

@@ -0,0 +1,41 @@
+{- git-annex command
+ -
+ - Copyright 2011 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Describe where
+
+
+import Command
+import qualified GitRepo as Git
+import qualified Remotes
+import UUID
+import Messages
+import qualified Command.Init
+
+command :: [Command]
+command = [Command "describe" (paramPair paramRemote paramDesc) seek
+	"change description of a repository"]
+
+seek :: [CommandSeek]
+seek = [withString start]
+
+start :: CommandStartString
+start params = notBareRepo $ do
+	let (name, description) =
+		case (words params) of
+			(n:d) -> (n,unwords d)
+			_ -> error "Specify a repository and a description."
+	
+	showStart "describe" name
+	Remotes.readConfigs
+	r <- Remotes.byName name
+	return $ Just $ perform r description
+
+perform :: Git.Repo -> String -> CommandPerform
+perform repo description = do
+	u <- getUUID repo
+	describeUUID u description
+	return $ Just $ Command.Init.cleanup