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.

Git/Queue.hs

@@ -72,8 +72,8 @@ full :: Queue -> Bool
 full (Queue n _) = n > maxSize
 
 {- Runs a queue on a git repository. -}
-flush :: Repo -> Queue -> IO Queue
-flush repo (Queue _ m) = do
+flush :: Queue -> Repo -> IO Queue
+flush (Queue _ m) repo = do
 	forM_ (M.toList m) $ uncurry $ runAction repo
 	return empty
 
@@ -87,6 +87,6 @@ runAction :: Repo -> Action -> [FilePath] -> IO ()
 runAction repo action files =
 	pOpen WriteToPipe "xargs" ("-0":"git":params) feedxargs
 	where
-		params = toCommand $ gitCommandLine repo
-			(Param (getSubcommand action):getParams action)
+		params = toCommand $ gitCommandLine
+			(Param (getSubcommand action):getParams action) repo
 		feedxargs h = hPutStr h $ join "\0" files