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|
{- directory manipulation
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.Directory where
import System.IO.Error
import System.Posix.Files
import System.Directory
import Control.Exception (throw)
import Control.Monad
import Control.Monad.IfElse
import System.FilePath
import Control.Applicative
import Control.Exception (bracket_)
import System.Posix.Directory
import Utility.SafeCommand
import Utility.TempFile
import Utility.Exception
import Utility.Monad
import Utility.Path
{- Lists the contents of a directory.
- Unlike getDirectoryContents, paths are not relative to the directory. -}
dirContents :: FilePath -> IO [FilePath]
dirContents d = map (d </>) . filter notcruft <$> getDirectoryContents d
where
notcruft "." = False
notcruft ".." = False
notcruft _ = True
{- Moves one filename to another.
- First tries a rename, but falls back to moving across devices if needed. -}
moveFile :: FilePath -> FilePath -> IO ()
moveFile src dest = tryIO (rename src dest) >>= onrename
where
onrename (Right _) = noop
onrename (Left e)
| isPermissionError e = rethrow
| isDoesNotExistError e = rethrow
| otherwise = do
-- copyFile is likely not as optimised as
-- the mv command, so we'll use the latter.
-- But, mv will move into a directory if
-- dest is one, which is not desired.
whenM (isdir dest) rethrow
viaTmp mv dest undefined
where
rethrow = throw e
mv tmp _ = do
ok <- boolSystem "mv" [Param "-f",
Param src, Param tmp]
unless ok $ do
-- delete any partial
_ <- tryIO $ removeFile tmp
rethrow
isdir f = do
r <- tryIO $ getFileStatus f
case r of
(Left _) -> return False
(Right s) -> return $ isDirectory s
{- Runs an action in another directory. -}
bracketCd :: FilePath -> IO a -> IO a
bracketCd dir a = go =<< getCurrentDirectory
where
go cwd
| dirContains dir cwd = a
| otherwise = bracket_
(changeWorkingDirectory dir)
(changeWorkingDirectory cwd)
a
|
