Fix deprecation warnings with latest versions of yaml

src/Language/Haskell/Brittany/Internal.hs

@@ -122,7 +122,8 @@ extractCommentConfigs anns (TopLevelDeclNameMap declNameMap) = do
         , \s -> "{" `isPrefixOf` dropWhile (== ' ') s
         , Butcher.addCmdPart (Butcher.varPartDesc "yaml-config-document")
         $ fmap (\lconf -> (mempty { _conf_layout = lconf }, ""))
-        . Data.Yaml.decode
+        . either (\_ -> Nothing) Just
+        . Data.Yaml.decodeEither'
         . Data.ByteString.Char8.pack
           -- TODO: use some proper utf8 encoder instead?
         )

src/Language/Haskell/Brittany/Internal/Config.hs

@@ -235,14 +235,14 @@ readConfig path = do
   if exists
     then do
       contents <- liftIO $ ByteString.readFile path -- no lazy IO, tyvm.
-      fileConf <- case Data.Yaml.decodeEither contents of
+      fileConf <- case Data.Yaml.decodeEither' contents of
         Left e -> do
           liftIO
             $  putStrErrLn
             $  "error reading in brittany config from "
             ++ path
             ++ ":"
-          liftIO $ putStrErrLn e
+          liftIO $ putStrErrLn (Data.Yaml.prettyPrintParseException e)
           mzero
         Right x -> return x
       return $ Just fileConf