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1{-# LANGUAGE ScopedTypeVariables #-}
2module ControlMaybe where
3
4-- import GHC.IO.Exception (IOException(..))
5import Control.Exception as Exception (IOException(..),catch)
6
7
8withJust :: Monad m => Maybe x -> (x -> m ()) -> m ()
9withJust (Just x) f = f x
10withJust Nothing f = return ()
11
12whenJust :: Monad m => m (Maybe x) -> (x -> m ()) -> m ()
13whenJust acn f = do
14 x <- acn
15 withJust x f
16
17
18catchIO_ :: IO a -> IO a -> IO a
19catchIO_ a h = Exception.catch a (\(_ :: IOException) -> h)
20
21catchIO :: IO a -> (IOException -> IO a) -> IO a
22catchIO body handler = Exception.catch body handler
23
24handleIO_ :: IO a -> IO a -> IO a
25handleIO_ = flip catchIO_
26
27
28handleIO :: (IOException -> IO a) -> IO a -> IO a
29handleIO = flip catchIO