1 files changed, 9 insertions, 6 deletions

diff --git a/ymir/mlmmj-expose.nix b/ymir/mlmmj-expose.nix
index aca8aeb1..b3eab046 100644
--- a/ymir/mlmmj-expose.nix
+++ b/ymir/mlmmj-expose.nix
@@ -37,14 +37,17 @@ let
           "mlmmj-exposed" -> do
             args <- getArgs
             case args of
-              [listDir, extension] -> do
+              [listDir, (map toLower -> extension)] -> do
                 setCurrentDirectory listDir
                 identities <- getIdentities
                 subscribers <- getSubscribers
-                let hashes = [(ident, sub, take len $ hash' (ident, sub)) | ident <- identities, sub <- subscribers]
-                unless (extension `elem` map (\(_, _, s) -> s) hashes) $ die "Unknown extension"
-                getContents >>= writeFile "queue/exposed"
-                callProcess "${pkgs.mlmmj}/bin/mlmmj-send" ["-L", listDir, "-l", "6", "-m", "queue/exposed", "-T", recipient]
+                let hashes = filter ((==) extension . snd) [((ident, sub), take len $ hash' (ident, sub)) | ident <- identities, sub <- subscribers]
+                case hashes of
+                  [(_, recipient)] -> do
+                    getContents >>= writeFile "queue/exposed"
+                    callProcess "${pkgs.mlmmj}/bin/mlmmj-send" ["-L", listDir, "-l", "6", "-m", "queue/exposed", "-T", recipient]
+                  [] -> die "Unknown extension"
+                  _ -> die "Ambiguous extension"
               _ -> hPutStrLn stderr ("Called without expected arguments (<listDirectory> <recipientExtension>)") >> exitWith (ExitFailure 2)
           "mlmmj-expose" -> do
             args <- getArgs
@@ -79,7 +82,7 @@ let
           readDir dir = concat <$> (mapM (fmap lines . readFile) . map (dir </>) . filter (not . (`elem` [".", ".."]))=<< (getDirectoryContents dir))
 
       hash' :: Show a => a -> String
-      hash' = show . (hash :: BS.ByteString -> Digest SHA256) . CBS.pack . map toLower . show
+      hash' = map toLower . show . (hash :: BS.ByteString -> Digest SHA256) . CBS.pack . map toLower . show
 
       len :: Int
       len = 16