ipprint-0.2: IPPrint.hs

module IPPrint(pprint) where

import Language.Haskell.Parser
import Language.Haskell.Pretty
import Text.Read

pprint :: Show a => a -> IO ()
pprint v =  putStrLn $
            case parseModule ("value = "++s) of
              ParseOk         m -> tidy $ prettyPrint m
              ParseFailed _ _   -> s
    where s = show v
          tidy x = case readPrec_to_S skipBoring 0 x of
                     [((), tail)] -> "   " ++ tail
                     _            -> s

skipBoring :: ReadPrec ()
skipBoring = 
    do { Ident "value" <- lexP; Punc  "=" <- lexP; return () } <++ 
    do { lexP; skipBoring }