reorder repo parameters last

Many functions took the repo as their first parameter. Changing it
consistently to be the last parameter allows doing some useful things with
currying, that reduce boilerplate.

In particular, g <- gitRepo is almost never needed now, instead
use inRepo to run an IO action in the repo, and fromRepo to get
a value from the repo.

This also provides more opportunities to use monadic and applicative
combinators.

Command/Uninit.hs

@@ -28,11 +28,9 @@ check = do
 	when (b == Annex.Branch.name) $ error $
 		"cannot uninit when the " ++ b ++ " branch is checked out"
 	where
-		current_branch = do
-			g <- gitRepo
-			b <- liftIO $
-				Git.pipeRead g [Params "rev-parse --abbrev-ref HEAD"]
-			return $ head $ lines $ B.unpack b
+		current_branch = head . lines . B.unpack <$> revhead
+		revhead = inRepo $ Git.pipeRead 
+			[Params "rev-parse --abbrev-ref HEAD"]
 
 seek :: [CommandSeek]
 seek = [withFilesInGit startUnannex, withNothing start]
@@ -53,12 +51,11 @@ perform = next cleanup
 
 cleanup :: CommandCleanup
 cleanup = do
-	g <- gitRepo
+	annexdir <- fromRepo $ gitAnnexDir
 	uninitialize
 	mapM_ removeAnnex =<< getKeysPresent
-	liftIO $ removeDirectoryRecursive (gitAnnexDir g)
+	liftIO $ removeDirectoryRecursive annexdir
 	-- avoid normal shutdown
 	saveState
-	liftIO $ do
-		Git.run g "branch" [Param "-D", Param Annex.Branch.name]
-		exitSuccess
+	inRepo $ Git.run "branch" [Param "-D", Param Annex.Branch.name]
+	liftIO $ exitSuccess