add git-annex-shell command

This is not yet complete, as it does not allow starting rsync or scp.

Options.hs

@@ -0,0 +1,44 @@
+{- git-annex dashed options
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Options where
+
+import System.Console.GetOpt
+
+import qualified Annex
+import Types
+import Command
+
+{- Each dashed command-line option results in generation of an action
+ - in the Annex monad that performs the necessary setting.
+ -}
+type Option = OptDescr (Annex ())
+
+storeOptBool :: FlagName -> Bool -> Annex ()
+storeOptBool name val = Annex.flagChange name $ FlagBool val
+storeOptString :: FlagName -> String -> Annex ()
+storeOptString name val = Annex.flagChange name $ FlagString val
+
+commonOptions :: [Option]
+commonOptions = [
+	    Option ['f'] ["force"] (NoArg (storeOptBool "force" True))
+		"allow actions that may lose annexed data"
+	  , Option ['q'] ["quiet"] (NoArg (storeOptBool "quiet" True))
+		"avoid verbose output"
+	  , Option ['v'] ["verbose"] (NoArg (storeOptBool "quiet" False))
+		"allow verbose output"
+	  , Option ['b'] ["backend"] (ReqArg (storeOptString "backend") paramName)
+		"specify default key-value backend to use"
+	  , Option ['k'] ["key"] (ReqArg (storeOptString "key") paramKey)
+		"specify a key to use"
+	  , Option ['t'] ["to"] (ReqArg (storeOptString "torepository") paramRemote)
+		"specify to where to transfer content"
+	  , Option ['f'] ["from"] (ReqArg (storeOptString "fromrepository") paramRemote)
+		"specify from where to transfer content"
+	  , Option ['x'] ["exclude"] (ReqArg (storeOptString "exclude") paramGlob)
+		"skip files matching the glob pattern"
+	  ]