diff options
| author | Joey Hess <joey@kitenet.net> | 2014-05-14 19:41:05 -0400 |
|---|---|---|
| committer | Joey Hess <joey@kitenet.net> | 2014-05-14 19:41:05 -0400 |
| commit | 7115d1ec162b4059b3e8e8f84bd8d5898c1db025 (patch) | |
| tree | 42c1cce54e890e1d56484794ab33129132d8fee2 /Utility/Exception.hs | |
| parent | ffe371a9d42cded461236e972a24a142419d7fc4 (diff) | |
moved source code to src
This is to work around OSX's brain-damange regarding filename case
insensitivity.
Avoided moving config.hs, because it's a config file. Put in a symlink to
make build work.
Diffstat (limited to 'Utility/Exception.hs')
| -rw-r--r-- | Utility/Exception.hs | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/Utility/Exception.hs b/Utility/Exception.hs deleted file mode 100644 index 1fecf65d..00000000 --- a/Utility/Exception.hs +++ /dev/null @@ -1,59 +0,0 @@ -{- Simple IO exception handling (and some more) - - - - Copyright 2011-2012 Joey Hess <joey@kitenet.net> - - - - License: BSD-2-clause - -} - -{-# LANGUAGE ScopedTypeVariables #-} - -module Utility.Exception where - -import Control.Exception -import qualified Control.Exception as E -import Control.Applicative -import Control.Monad -import System.IO.Error (isDoesNotExistError) -import Utility.Data - -{- Catches IO errors and returns a Bool -} -catchBoolIO :: IO Bool -> IO Bool -catchBoolIO = catchDefaultIO False - -{- 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 <$> tryIO a - -{- catch specialized for IO errors only -} -catchIO :: IO a -> (IOException -> IO a) -> IO a -catchIO = E.catch - -{- try specialized for IO errors only -} -tryIO :: IO a -> IO (Either IOException a) -tryIO = try - -{- Catches all exceptions except for async exceptions. - - This is often better to use than catching them all, so that - - ThreadKilled and UserInterrupt get through. - -} -catchNonAsync :: IO a -> (SomeException -> IO a) -> IO a -catchNonAsync a onerr = a `catches` - [ Handler (\ (e :: AsyncException) -> throw e) - , Handler (\ (e :: SomeException) -> onerr e) - ] - -tryNonAsync :: IO a -> IO (Either SomeException a) -tryNonAsync a = (Right <$> a) `catchNonAsync` (return . Left) - -{- Catches only DoesNotExist exceptions, and lets all others through. -} -tryWhenExists :: IO a -> IO (Maybe a) -tryWhenExists a = eitherToMaybe <$> - tryJust (guard . isDoesNotExistError) a |
