blob: 8b6077743d6b29dea214f4f2a8b0f16f3efb847e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
{- Simple IO exception handling
-
- Copyright 2011-2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.Exception where
import Prelude hiding (catch)
import Control.Exception
import Control.Applicative
{- Catches IO errors and returns a Bool -}
catchBoolIO :: IO Bool -> IO Bool
catchBoolIO a = catchDefaultIO False a
{- Catches IO errors and returns a Maybe -}
catchMaybeIO :: IO a -> IO (Maybe a)
catchMaybeIO a = catchDefaultIO Nothing $ Just <$> a
{- Catches IO errors and returns a default value. -}
catchDefaultIO :: a -> IO a -> IO a
catchDefaultIO def a = catchIO a (const $ return def)
{- Catches IO errors and returns the error message. -}
catchMsgIO :: IO a -> IO (Either String a)
catchMsgIO a = either (Left . show) Right <$> tryIO a
{- catch specialized for IO errors only -}
catchIO :: IO a -> (IOException -> IO a) -> IO a
catchIO = catch
{- try specialized for IO errors only -}
tryIO :: IO a -> IO (Either IOException a)
tryIO = try
|