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|
{-# OPTIONS -cpp #-}
----------------------------------------------------------------------
-- |
-- Module : GF.System.Readline
-- Maintainer : BB
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/05/10 14:55:01 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.1 $
--
-- Uses the right readline library to read user input.
-----------------------------------------------------------------------------
module GF.System.Readline (fetchCommand) where
#ifdef USE_READLINE
import System.Console.Readline (readline, addHistory)
#else
import System.IO.Error (try)
import System.IO (stdout,hFlush)
#endif
#ifdef USE_READLINE
fetchCommand :: String -> IO (String)
fetchCommand s = do
res <- readline s
case res of
Nothing -> return "q"
Just s -> do addHistory s
return s
#else
fetchCommand :: String -> IO (String)
fetchCommand s = do
putStr s
hFlush stdout
res <- try getLine
case res of
Left e -> return "q"
Right l -> return l
#endif
|
