add pygment lexer info

ipython-kernel/src/IHaskell/IPython/Message/Writer.hs

@@ -20,6 +20,7 @@ instance ToJSON LanguageInfo where
                   , "version" .= languageVersion info
                   , "file_extension" .= languageFileExtension info
                   , "codemirror_mode" .= languageCodeMirrorMode info
+                  , "pygments_lexer" .= languagePygmentsLexer info
                   ]
 
 -- Convert message bodies into JSON.

ipython-kernel/src/IHaskell/IPython/Types.hs

@@ -276,6 +276,7 @@ data LanguageInfo =
          , languageVersion :: String        -- ^ GHC 7.6.3
          , languageFileExtension :: String        -- ^ .hs
          , languageCodeMirrorMode :: String        -- ^ 'ihaskell'. can be 'null'
+         , languagePygmentsLexer :: String
          }
   deriving (Show, Eq)
 

main/Main.hs

@@ -274,6 +274,7 @@ replyTo interface KernelInfoRequest{} replyHeader state = do
                 , languageVersion = VERSION_ghc
                 , languageFileExtension = ".hs"
                 , languageCodeMirrorMode = "ihaskell"
+                , languagePygmentsLexer = "Haskell"
                 }
               , status = Ok
               })