use sync command merge engine in assistant

To handle direct mode merging.

Assistant/Threads/Merger.hs

@@ -14,8 +14,8 @@ import Utility.DirWatcher
 import Utility.Types.DirWatcher
 import qualified Annex.Branch
 import qualified Git
-import qualified Git.Merge
 import qualified Git.Branch
+import qualified Command.Sync
 
 thisThread :: ThreadName
 thisThread = "Merger"
@@ -80,8 +80,7 @@ onAdd file
 				[ "merging", show changedbranch
 				, "into", show current
 				]
-			void $ liftAnnex $ inRepo $
-				Git.Merge.mergeNonInteractive changedbranch
+			void $ liftAnnex  $ Command.Sync.mergeFrom changedbranch
 	mergecurrent _ = noop
 
 equivBranches :: Git.Ref -> Git.Ref -> Bool

Command/Sync.hs

@@ -1,7 +1,7 @@
 {- git-annex command
  -
- - Copyright 2011 Joey Hess <joey@kitenet.net>
  - Copyright 2011 Joachim Breitner <mail@joachim-breitner.de>
+ - Copyright 2011,2012 Joey Hess <joey@kitenet.net>
  -
  - Licensed under the GNU GPL version 3 or higher.
  -}

doc/design/assistant/desymlink.mdwn

@@ -87,6 +87,12 @@ is converted to a real file when it becomes present.
 * Deal with files changing as they're being transferred from a direct mode
   repository to another git repository. The remote repo currently will 
   accept the bad data and update the location log to say it has the key.
+* When the assistant adds a modified direct mode file, it leaves behind
+  an associated files mapping to the file for the old key as well. That
+  needs to be deleted (sync deletes it in the similar situation).
+* kqueue does not deliver an event when an existing file is modified;
+  need a different way to detect file modifications (possibly an OSX specific
+  interface?)
 
 ## done