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Add windows support to hpath-directory
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| -- | | ||
| -- Module : System.Directory.Errors | ||
| -- Copyright : © 2016 Julian Ospald | ||
| -- License : BSD3 | ||
| -- | ||
| -- Maintainer : Julian Ospald <hasufell@posteo.de> | ||
| -- Stability : experimental | ||
| -- Portability : portable | ||
| -- | ||
| -- Provides error handling. | ||
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| {-# LANGUAGE DeriveDataTypeable #-} | ||
| {-# LANGUAGE ScopedTypeVariables #-} | ||
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| module System.Directory.Errors | ||
| ( | ||
| -- * Types | ||
| HPathIOException(..) | ||
| , RecursiveFailureHint(..) | ||
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| -- * Exception identifiers | ||
| , isSameFile | ||
| , isDestinationInSource | ||
| , isRecursiveFailure | ||
| , isReadContentsFailed | ||
| , isCreateDirFailed | ||
| , isCopyFileFailed | ||
| , isRecreateSymlinkFailed | ||
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| -- * Error handling functions | ||
| , handleIOError | ||
| , hideError | ||
| , bracketeer | ||
| , reactOnError | ||
| ) | ||
| where | ||
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| import Control.Applicative | ||
| ( | ||
| (<$>) | ||
| ) | ||
| import Control.Exception.Safe hiding (handleIOError) | ||
| import Control.Monad | ||
| ( | ||
| forM | ||
| , when | ||
| ) | ||
| import Control.Monad.IfElse | ||
| ( | ||
| whenM | ||
| ) | ||
| import Foreign.C.Error | ||
| ( | ||
| getErrno | ||
| , Errno | ||
| ) | ||
| import GHC.IO.Exception | ||
| ( | ||
| IOErrorType | ||
| ) | ||
| import System.IO.Error | ||
| ( | ||
| alreadyExistsErrorType | ||
| , ioeGetErrorType | ||
| , mkIOError | ||
| ) | ||
| import System.Directory.Types | ||
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| toConstr :: HPathIOException -> String | ||
| toConstr SameFile {} = "SameFile" | ||
| toConstr DestinationInSource {} = "DestinationInSource" | ||
| toConstr RecursiveFailure {} = "RecursiveFailure" | ||
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| ----------------------------- | ||
| --[ Exception identifiers ]-- | ||
| ----------------------------- | ||
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| isSameFile, isDestinationInSource, isRecursiveFailure :: HPathIOException -> Bool | ||
| isSameFile ex = toConstr (ex :: HPathIOException) == toConstr (SameFile mempty mempty) | ||
| isDestinationInSource ex = toConstr (ex :: HPathIOException) == (toConstr $ DestinationInSource mempty mempty) | ||
| isRecursiveFailure ex = toConstr (ex :: HPathIOException) == (toConstr $ RecursiveFailure mempty) | ||
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| isReadContentsFailed, isCreateDirFailed, isCopyFileFailed, isRecreateSymlinkFailed ::RecursiveFailureHint -> Bool | ||
| isReadContentsFailed ReadContentsFailed{} = True | ||
| isReadContentsFailed _ = False | ||
| isCreateDirFailed CreateDirFailed{} = True | ||
| isCreateDirFailed _ = False | ||
| isCopyFileFailed CopyFileFailed{} = True | ||
| isCopyFileFailed _ = False | ||
| isRecreateSymlinkFailed RecreateSymlinkFailed{} = True | ||
| isRecreateSymlinkFailed _ = False | ||
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| -------------------------------- | ||
| --[ Error handling functions ]-- | ||
| -------------------------------- | ||
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| -- |Like `catchIOError`, with arguments swapped. | ||
| handleIOError :: (IOError -> IO a) -> IO a -> IO a | ||
| handleIOError = flip catchIOError | ||
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| hideError :: IOErrorType -> IO () -> IO () | ||
| hideError err = handleIO (\e -> if err == ioeGetErrorType e then pure () else ioError e) | ||
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| -- |Like `bracket`, but allows to have different clean-up | ||
| -- actions depending on whether the in-between computation | ||
| -- has raised an exception or not. | ||
| bracketeer :: IO a -- ^ computation to run first | ||
| -> (a -> IO b) -- ^ computation to run last, when | ||
| -- no exception was raised | ||
| -> (a -> IO b) -- ^ computation to run last, | ||
| -- when an exception was raised | ||
| -> (a -> IO c) -- ^ computation to run in-between | ||
| -> IO c | ||
| bracketeer before after afterEx thing = | ||
| mask $ \restore -> do | ||
| a <- before | ||
| r <- restore (thing a) `onException` afterEx a | ||
| _ <- after a | ||
| return r | ||
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| reactOnError :: IO a | ||
| -> [(IOErrorType, IO a)] -- ^ reaction on IO errors | ||
| -> [(HPathIOException, IO a)] -- ^ reaction on HPathIOException | ||
| -> IO a | ||
| reactOnError a ios fmios = | ||
| a `catches` [iohandler, fmiohandler] | ||
| where | ||
| iohandler = Handler $ | ||
| \(ex :: IOException) -> | ||
| foldr (\(t, a') y -> if ioeGetErrorType ex == t | ||
| then a' | ||
| else y) | ||
| (throwIO ex) | ||
| ios | ||
| fmiohandler = Handler $ | ||
| \(ex :: HPathIOException) -> | ||
| foldr (\(t, a') y -> if toConstr ex == toConstr t | ||
| then a' | ||
| else y) | ||
| (throwIO ex) | ||
| fmios | ||
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