broke subcommands out into separate modules

Command/FromKey.hs

@@ -0,0 +1,44 @@
+{- git-annex command
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.FromKey where
+
+import Control.Monad.State (liftIO)
+import System.Posix.Files
+import System.Directory
+import Control.Monad (when, unless)
+
+import Command
+import qualified Annex
+import Utility
+import qualified Backend
+import Types
+import Core
+
+{- Adds a file pointing at a manually-specified key -}
+start :: SubCmdStartString
+start file = do
+	keyname <- Annex.flagGet "key"
+	when (null keyname) $ error "please specify the key with --key"
+	backends <- Backend.list
+	let key = genKey (backends !! 0) keyname
+
+	inbackend <- Backend.hasKey key
+	unless (inbackend) $ error $
+		"key ("++keyname++") is not present in backend"
+	showStart "fromkey" file
+	return $ Just $ perform file key
+perform :: FilePath -> Key -> SubCmdPerform
+perform file key = do
+	link <- calcGitLink file key
+	liftIO $ createDirectoryIfMissing True (parentDir file)
+	liftIO $ createSymbolicLink link file
+	return $ Just $ cleanup file
+cleanup :: FilePath -> SubCmdCleanup
+cleanup file = do
+	Annex.queue "add" [] file
+	return True