71 lines
2.4 KiB
Haskell
71 lines
2.4 KiB
Haskell
{- Temporary files and directories.
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-
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- Copyright 2010-2013 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Utility.Tmp where
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import Control.Exception (bracket)
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import System.IO
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import System.Directory
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import Control.Monad.IfElse
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import Utility.Exception
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import System.FilePath
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type Template = String
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{- Runs an action like writeFile, writing to a temp file first and
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- then moving it into place. The temp file is stored in the same
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- directory as the final file to avoid cross-device renames. -}
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viaTmp :: (FilePath -> String -> IO ()) -> FilePath -> String -> IO ()
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viaTmp a file content = do
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let (dir, base) = splitFileName file
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createDirectoryIfMissing True dir
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(tmpfile, handle) <- openTempFile dir (base ++ ".tmp")
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hClose handle
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a tmpfile content
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renameFile tmpfile file
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{- Runs an action with a tmp file located in the system's tmp directory
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- (or in "." if there is none) then removes the file. -}
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withTmpFile :: Template -> (FilePath -> Handle -> IO a) -> IO a
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withTmpFile template a = do
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tmpdir <- catchDefaultIO "." getTemporaryDirectory
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withTmpFileIn tmpdir template a
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{- Runs an action with a tmp file located in the specified directory,
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- then removes the file. -}
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withTmpFileIn :: FilePath -> Template -> (FilePath -> Handle -> IO a) -> IO a
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withTmpFileIn tmpdir template a = bracket create remove use
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where
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create = openTempFile tmpdir template
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remove (name, handle) = do
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hClose handle
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catchBoolIO (removeFile name >> return True)
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use (name, handle) = a name handle
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{- Runs an action with a tmp directory located within the system's tmp
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- directory (or within "." if there is none), then removes the tmp
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- directory and all its contents. -}
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withTmpDir :: Template -> (FilePath -> IO a) -> IO a
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withTmpDir template a = do
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tmpdir <- catchDefaultIO "." getTemporaryDirectory
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withTmpDirIn tmpdir template a
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{- Runs an action with a tmp directory located within a specified directory,
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- then removes the tmp directory and all its contents. -}
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withTmpDirIn :: FilePath -> Template -> (FilePath -> IO a) -> IO a
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withTmpDirIn tmpdir template = bracket create remove
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where
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remove d = whenM (doesDirectoryExist d) $
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removeDirectoryRecursive d
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create = do
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createDirectoryIfMissing True tmpdir
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makenewdir (tmpdir </> template) (0 :: Int)
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makenewdir t n = do
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let dir = t ++ "." ++ show n
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either (const $ makenewdir t $ n + 1) (const $ return dir)
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=<< tryIO (createDirectory dir)
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