62 lines
1.7 KiB
Haskell
62 lines
1.7 KiB
Haskell
{- directory manipulation
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-
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- Copyright 2011 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.Directory where
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import System.IO.Error
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import System.Posix.Files
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import System.Directory
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import Control.Exception (throw)
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import Control.Monad
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import Control.Monad.IfElse
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import System.FilePath
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import Control.Applicative
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import Utility.SafeCommand
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import Utility.TempFile
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import Utility.Exception
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import Utility.Monad
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{- Lists the contents of a directory.
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- Unlike getDirectoryContents, paths are not relative to the directory. -}
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dirContents :: FilePath -> IO [FilePath]
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dirContents d = map (d </>) . filter notcruft <$> getDirectoryContents d
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where
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notcruft "." = False
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notcruft ".." = False
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notcruft _ = True
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{- Moves one filename to another.
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- First tries a rename, but falls back to moving across devices if needed. -}
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moveFile :: FilePath -> FilePath -> IO ()
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moveFile src dest = tryIO (rename src dest) >>= onrename
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where
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onrename (Right _) = noop
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onrename (Left e)
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| isPermissionError e = rethrow
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| isDoesNotExistError e = rethrow
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| otherwise = do
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-- copyFile is likely not as optimised as
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-- the mv command, so we'll use the latter.
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-- But, mv will move into a directory if
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-- dest is one, which is not desired.
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whenM (isdir dest) rethrow
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viaTmp mv dest undefined
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where
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rethrow = throw e
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mv tmp _ = do
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ok <- boolSystem "mv" [Param "-f",
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Param src, Param tmp]
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unless ok $ do
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-- delete any partial
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_ <- tryIO $ removeFile tmp
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rethrow
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isdir f = do
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r <- tryIO $ getFileStatus f
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case r of
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(Left _) -> return False
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(Right s) -> return $ isDirectory s
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