I tried to install filemanip on a windows system but it failed at the build
stage:
C:\temp\filemanip-0.3.5.2>runghc Setup.lhs build
Preprocessing library filemanip-0.3.5.2...
Building filemanip-0.3.5.2...
System\FilePath\Manip.hs:25:7:
Could not find module `System.Posix.Temp':
Use -v to see a list of the files searched for.
It seems that Manip.hs depends on System.Posix.Temp but the cabal file says it
doesn't on windows:
if !os(windows) build-depends: unix
I amended Manip.hs to work on windows and I am pretty sure it will still work
on unix. I've attached the amended source (I would have attached a patch but
I'm not familiar with the source control system you are using).
I also noticed that someone else had submitted a patch for windows support:
https://bitbucket.org/bos/filemanip/issue/1/patch-for-windows-support. Did this
every get incorporated? For some reason I wasn't able to look at it but it may
be better than my patch.
Dominic.
{-# LANGUAGE FlexibleInstances, ScopedTypeVariables, TypeSynonymInstances #-}
-- |
-- Module: System.FilePath.Manip
-- Copyright: Bryan O'Sullivan
-- License: BSD3
-- Maintainer: Bryan O'Sullivan
-- Stability: unstable
-- Portability: Unix-like systems (requires flexible instances)
module System.FilePath.Manip (
Streamable(..)
, renameWith
, modifyWith
, modifyWithBackup
, modifyInPlace
) where
import Control.Exception
import Control.Monad (liftM)
import Data.Bits ((.&.))
import System.Directory (removeFile, getTemporaryDirectory)
import System.IO (Handle, IOMode(..), hClose, openFile, openTempFile)
import System.PosixCompat.Files (fileMode, getFileStatus, rename, setFileMode)
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Lazy.Char8 as L
import qualified System.IO as I
-- | Use a renaming function to generate a new name for a file, then
-- rename it.
renameWith :: (FilePath -> FilePath) -- ^ function to rename with
-> FilePath -- ^ file to rename
-> IO ()
renameWith f path = rename path (f path)
-- | Type class for string manipulation over files.
class Streamable a where
-- | Read the entire contents of a 'Handle'.
readAll :: Handle -> IO a
-- | Write an entire string to a 'Handle'.
writeAll :: Handle -> a -> IO ()
instance Streamable B.ByteString where
readAll = B.hGetContents
writeAll = B.hPut
instance Streamable L.ByteString where
readAll = L.hGetContents
writeAll = L.hPut
instance Streamable String where
readAll = I.hGetContents
writeAll = I.hPutStr
-- | Modify a file in place using the given function. This is
-- performed by writing to a temporary file, then renaming it on top of
-- the existing file when done.
modifyInPlace :: Streamable a => (a -> a) -- ^ transformation function
-> FilePath -- ^ name of file to modify
-> IO ()
modifyInPlace = modifyWith (flip rename)
-- | Modify a file in place using the given function. The original
-- copy of the file is saved under a new name. This is performed by
-- writing to a temporary file; renaming the original file to its new
-- name; then renaming the temporary file to the original name.
--
-- Example:
--
-- @
-- -- save original file with a \".bak\" extension
-- 'modifyWithBackup' (\<.\> \"bak\")
-- @
modifyWithBackup :: Streamable a =>
(FilePath -> FilePath) -- ^ chooses new name for original
file
-> (a -> a) -- ^ transformation function
-> FilePath -- ^ name of file to modify
-> IO ()
modifyWithBackup f = modifyWith backup
where backup path tmpPath = renameWith f path >> rename tmpPath path
-- | Modify a file in place using the given function. The new content
-- is written to a temporary file. Once this is complete, the file
-- manipulation action is called. Its arguments are the names of the
-- original and temporary files.
--
-- Example:
--
-- @
-- 'modifyInPlace' = 'modifyWith' (flip rename)
-- @
modifyWith :: Streamable a =>
(FilePath -> FilePath -> IO ()) -- ^ file manipulation action
-> (a -> a) -- ^ transformation function
-> FilePath
-> IO ()
modifyWith after transform path =
bracket (openFile path ReadMode) hClose $ \ih -> do
tmpDir <- getTemporaryDirectory
(tmpPath, oh) <- openTempFile tmpDir "XXX.XXX"
let ignore = return ()
nukeTmp = handle (\(_::IOException) -> ignore) (removeFile tmpPath)
handle (\(e::IOException) -> nukeTmp >> throw e) $ do
bracket_ ignore (hClose oh) $
readAll ih >>= return . transform >>= writeAll oh
handle (\(_::IOException) -> nukeTmp) $ do
mode <- fileMode `liftM` getFileStatus path
setFileMode tmpPath (mode .&. 0777)
after path tmpPath
