detect when unwanted remote is empty and remove it

Needs fixes to build when the webapp is disabled.

Assistant/DeleteRemote.hs

@@ -0,0 +1,52 @@
+{- git-annex assistant remote deletion utilities
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Assistant.DeleteRemote where
+
+import Assistant.Common
+import Assistant.WebApp
+import Assistant.WebApp.Types
+import Assistant.Alert
+import Assistant.DaemonStatus
+import qualified Remote
+import Remote.List
+import qualified Git.Command
+import Logs.Trust
+
+import qualified Data.Text as T
+
+{- Removes a remote (but leave the repository as-is), and returns the old
+ - Remote data. -}
+removeRemote :: UUID -> Assistant Remote
+removeRemote uuid = do
+	remote <- fromMaybe (error "unknown remote")
+		<$> liftAnnex (Remote.remoteFromUUID uuid)
+	liftAnnex $ do
+		inRepo $ Git.Command.run
+			[ Param "remote"
+			, Param "remove"
+			, Param (Remote.name remote)
+			]
+		void $ remoteListRefresh
+	updateSyncRemotes
+	return remote
+
+{- Called when a remote was marked as unwanted, and is now empty, so can be
+ - removed. -}
+finishRemovingRemote :: UrlRenderer -> UUID -> Assistant ()
+finishRemovingRemote urlrenderer uuid = do
+	void $ removeRemote uuid
+	liftAnnex $ trustSet uuid DeadTrusted
+
+	desc <- liftAnnex $ Remote.prettyUUID uuid
+	url <- liftIO $ renderUrl urlrenderer (FinishedDeletingRepositoryContentsR uuid) []
+	close <- asIO1 removeAlert
+	void $ addAlert $ remoteRemovalAlert desc $ AlertButton
+		{ buttonLabel = T.pack "Finish removal"
+		, buttonUrl = url
+		, buttonAction = Just close
+		}