avoid showing json lists of remotes when not in json mode

Messages.hs

@@ -19,12 +19,14 @@ module Messages (
 	showErr,
 	warning,
 	indent,
+	maybeShowJSON,
 	setupConsole
 ) where
 
 import Control.Monad.State (liftIO)
 import System.IO
 import Data.String.Utils
+import Text.JSON
 
 import Types
 import qualified Annex
@@ -106,5 +108,9 @@ handle json normal = do
 		Annex.QuietOutput -> q
 		Annex.JSONOutput -> liftIO json
 
+{- Shows a JSON value only when in json mode. -}
+maybeShowJSON :: JSON a => [(String, a)] -> Annex ()
+maybeShowJSON v = handle (JSON.add v) q
+
 q :: Monad m => m ()
 q = return ()

Messages/JSON.hs

@@ -8,9 +8,12 @@
 module Messages.JSON (
 	start,
 	end,
-	note
+	note,
+	add
 ) where
 
+import Text.JSON
+
 import qualified Utility.JSONStream as Stream
 
 start :: String -> String -> IO ()
@@ -20,4 +23,7 @@ end :: Bool -> IO ()
 end b = putStr $ Stream.add [("success", b)] ++ Stream.end
 
 note :: String -> IO ()
-note s = putStr $ Stream.add [("note", s)]
+note s = add [("note", s)]
+
+add :: JSON a => [(String, a)] -> IO ()
+add v = putStr $ Stream.add v

Remote.hs

@@ -30,7 +30,6 @@ module Remote (
 ) where
 
 import Control.Monad (filterM)
-import Control.Monad.State (liftIO)
 import Data.List
 import qualified Data.Map as M
 import Data.String.Utils
@@ -47,7 +46,6 @@ import Config
 import Trust
 import LocationLog
 import Messages
-import qualified Utility.JSONStream
 import RemoteLog
 
 import qualified Remote.Git
@@ -134,8 +132,7 @@ prettyPrintUUIDs :: String -> [UUID] -> Annex String
 prettyPrintUUIDs desc uuids = do
 	here <- getUUID =<< Annex.gitRepo
 	m <- M.union <$> uuidMap <*> availMap
-	liftIO . putStr $ Utility.JSONStream.add
-		[(desc, map (jsonify m here) uuids)]
+	maybeShowJSON [(desc, map (jsonify m here) uuids)]
 	return $ unwords $ map (\u -> "\t" ++ prettify m here u ++ "\n") uuids
 	where
 		availMap = M.fromList . map (\r -> (uuid r, name r)) <$> genList