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|
{- temp file functions
-
- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.TempFile where
import Control.Exception (bracket)
import System.IO
import System.Posix.Process
import System.Directory
import Utility.Exception
import Utility.Path
import System.FilePath
{- Runs an action like writeFile, writing to a temp file first and
- then moving it into place. The temp file is stored in the same
- directory as the final file to avoid cross-device renames. -}
viaTmp :: (FilePath -> String -> IO ()) -> FilePath -> String -> IO ()
viaTmp a file content = do
pid <- getProcessID
let tmpfile = file ++ ".tmp" ++ show pid
createDirectoryIfMissing True (parentDir file)
a tmpfile content
renameFile tmpfile file
type Template = String
{- Runs an action with a temp file, then removes the file. -}
withTempFile :: Template -> (FilePath -> Handle -> IO a) -> IO a
withTempFile template a = bracket create remove use
where
create = do
tmpdir <- catchDefaultIO "." getTemporaryDirectory
openTempFile tmpdir template
remove (name, handle) = do
hClose handle
catchBoolIO (removeFile name >> return True)
use (name, handle) = a name handle
{- Runs an action with a temp directory, then removes the directory and
- all its contents. -}
withTempDir :: Template -> (FilePath -> IO a) -> IO a
withTempDir template = bracket create remove
where
remove = removeDirectoryRecursive
create = do
tmpdir <- catchDefaultIO "." getTemporaryDirectory
createDirectoryIfMissing True tmpdir
pid <- getProcessID
makedir tmpdir (template ++ show pid) (0 :: Int)
makedir tmpdir t n = do
let dir = tmpdir </> t ++ "." ++ show n
r <- tryIO $ createDirectory dir
either (const $ makedir tmpdir t $ n + 1) (const $ return dir) r
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