broke subcommands out into separate modules

Command/DropKey.hs

@@ -0,0 +1,47 @@
+{- git-annex command
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.DropKey where
+
+import Control.Monad.State (liftIO)
+import System.Directory
+
+import Command
+import qualified Annex
+import Locations
+import qualified Backend
+import LocationLog
+import Types
+import Core
+
+{- Drops cached content for a key. -}
+start :: SubCmdStartString
+start keyname = do
+	backends <- Backend.list
+	let key = genKey (backends !! 0) keyname
+	present <- inAnnex key
+	force <- Annex.flagIsSet "force"
+	if (not present)
+		then return Nothing
+		else if (not force)
+			then error "dropkey is can cause data loss; use --force if you're sure you want to do this"
+			else do
+				showStart "dropkey" keyname
+				return $ Just $ perform key
+
+perform :: Key -> SubCmdPerform
+perform key = do
+	g <- Annex.gitRepo
+	let loc = annexLocation g key
+	liftIO $ removeFile loc
+	return $ Just $ cleanup key
+
+cleanup :: Key -> SubCmdCleanup
+cleanup key = do
+	logStatus key ValueMissing
+	return True
+