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-{- Temporary files and directories.
- -
- - Copyright 2010-2013 Joey Hess <joey@kitenet.net>
- -
- - License: BSD-2-clause
- -}
-
-{-# LANGUAGE CPP #-}
-
-module Utility.Tmp where
-
-import Control.Exception (bracket)
-import System.IO
-import System.Directory
-import Control.Monad.IfElse
-import System.FilePath
-
-import Utility.Exception
-import Utility.FileSystemEncoding
-import Utility.PosixFiles
-
-type Template = String
-
-{- 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
- let (dir, base) = splitFileName file
- createDirectoryIfMissing True dir
- (tmpfile, handle) <- openTempFile dir (base ++ ".tmp")
- hClose handle
- a tmpfile content
- rename tmpfile file
-
-{- Runs an action with a tmp file located in the system's tmp directory
- - (or in "." if there is none) then removes the file. -}
-withTmpFile :: Template -> (FilePath -> Handle -> IO a) -> IO a
-withTmpFile template a = do
- tmpdir <- catchDefaultIO "." getTemporaryDirectory
- withTmpFileIn tmpdir template a
-
-{- Runs an action with a tmp file located in the specified directory,
- - then removes the file. -}
-withTmpFileIn :: FilePath -> Template -> (FilePath -> Handle -> IO a) -> IO a
-withTmpFileIn tmpdir template a = bracket create remove use
- where
- create = 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 tmp directory located within the system's tmp
- - directory (or within "." if there is none), then removes the tmp
- - directory and all its contents. -}
-withTmpDir :: Template -> (FilePath -> IO a) -> IO a
-withTmpDir template a = do
- tmpdir <- catchDefaultIO "." getTemporaryDirectory
- withTmpDirIn tmpdir template a
-
-{- Runs an action with a tmp directory located within a specified directory,
- - then removes the tmp directory and all its contents. -}
-withTmpDirIn :: FilePath -> Template -> (FilePath -> IO a) -> IO a
-withTmpDirIn tmpdir template = bracket create remove
- where
- remove d = whenM (doesDirectoryExist d) $ do
-#if mingw32_HOST_OS
- -- Windows will often refuse to delete a file
- -- after a process has just written to it and exited.
- -- Because it's crap, presumably. So, ignore failure
- -- to delete the temp directory.
- _ <- tryIO $ removeDirectoryRecursive d
- return ()
-#else
- removeDirectoryRecursive d
-#endif
- create = do
- createDirectoryIfMissing True tmpdir
- makenewdir (tmpdir </> template) (0 :: Int)
- makenewdir t n = do
- let dir = t ++ "." ++ show n
- either (const $ makenewdir t $ n + 1) (const $ return dir)
- =<< tryIO (createDirectory dir)
-
-{- It's not safe to use a FilePath of an existing file as the template
- - for openTempFile, because if the FilePath is really long, the tmpfile
- - will be longer, and may exceed the maximum filename length.
- -
- - This generates a template that is never too long.
- - (Well, it allocates 20 characters for use in making a unique temp file,
- - anyway, which is enough for the current implementation and any
- - likely implementation.)
- -}
-relatedTemplate :: FilePath -> FilePath
-relatedTemplate f
- | len > 20 = truncateFilePath (len - 20) f
- | otherwise = f
- where
- len = length f