Use TH

namecoin-update.hs

@@ -1,22 +1,20 @@
-{-# Language DeriveGeneric, RecordWildCards #-}
+{-# Language TemplateHaskell, RecordWildCards #-}
 
 import System.Process
 import System.Exit
-import GHC.Generics
 import Data.Aeson
+import Data.Aeson.TH
 import Data.ByteString.Lazy.Char8 (pack)
 
 readCommand       = readProcess "namecoind" ["name_list"] ""
 updateCommand n v = readProcessWithExitCode "namecoind" ["name_update", n, v] ""
 
-data Name =
-  Name { name       :: String
-       , value      :: String
-       , address    :: String
-       , expires_in :: Int
-       } deriving (Show, Generic)
+data Name = Name { name       :: String
+                 , value      :: String
+                 , expires_in :: Int
+                 }
 
-instance FromJSON Name
+deriveJSON defaultOptions ''Name
 
 updateName :: Name -> IO Int
 updateName Name{..}