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.

Remote/Rsync.hs

@@ -90,15 +90,12 @@ rsyncKeyDir :: RsyncOpts -> Key -> String
 rsyncKeyDir o k = rsyncUrl o </> hashDirMixed k </> shellEscape (keyFile k)
 
 store :: RsyncOpts -> Key -> Annex Bool
-store o k = do
-	g <- gitRepo
-	rsyncSend o k (gitAnnexLocation g k)
+store o k = rsyncSend o k =<< fromRepo (gitAnnexLocation k)
 
 storeEncrypted :: RsyncOpts -> (Cipher, Key) -> Key -> Annex Bool
 storeEncrypted o (cipher, enck) k = withTmp enck $ \tmp -> do
-	g <- gitRepo
-	let f = gitAnnexLocation g k
-	liftIO $ withEncryptedContent cipher (L.readFile f) $ \s -> L.writeFile tmp s
+	src <- fromRepo $ gitAnnexLocation k
+	liftIO $ withEncryptedContent cipher (L.readFile src) $ L.writeFile tmp
 	rsyncSend o enck tmp
 
 retrieve :: RsyncOpts -> Key -> FilePath -> Annex Bool
@@ -151,9 +148,9 @@ partialParams = Params "--no-inplace --partial --partial-dir=.rsync-partial"
  - up trees for rsync. -}
 withRsyncScratchDir :: (FilePath -> Annex Bool) -> Annex Bool
 withRsyncScratchDir a = do
-	g <- gitRepo
 	pid <- liftIO getProcessID
-	let tmp = gitAnnexTmpDir g </> "rsynctmp" </> show pid
+	t <- fromRepo gitAnnexTmpDir
+	let tmp = t </> "rsynctmp" </> show pid
 	nuke tmp
 	liftIO $ createDirectoryIfMissing True tmp
 	res <- a tmp