822a8c0ff8
Fixed handling of case when file does not exist to work like it did before, and avoid an excess stat call.
102 lines
2.9 KiB
Haskell
102 lines
2.9 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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{-# LANGUAGE CPP #-}
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module Utility.Directory where
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import System.IO.Error
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import System.PosixCompat.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 System.IO.Unsafe (unsafeInterleaveIO)
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import Utility.SafeCommand
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import Utility.Tmp
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import Utility.Exception
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import Utility.Monad
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dirCruft :: FilePath -> Bool
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dirCruft "." = True
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dirCruft ".." = True
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dirCruft _ = False
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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 (not . dirCruft) <$> getDirectoryContents d
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{- Gets files in a directory, and then its subdirectories, recursively,
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- and lazily. If the directory does not exist, no exception is thrown,
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- instead, [] is returned. -}
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dirContentsRecursive :: FilePath -> IO [FilePath]
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dirContentsRecursive topdir = dirContentsRecursive' [topdir]
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dirContentsRecursive' :: [FilePath] -> IO [FilePath]
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dirContentsRecursive' [] = return []
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dirContentsRecursive' (dir:dirs) = unsafeInterleaveIO $ do
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(files, dirs') <- collect [] [] =<< catchDefaultIO [] (dirContents dir)
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files' <- dirContentsRecursive' (dirs' ++ dirs)
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return (files ++ files')
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where
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collect files dirs' [] = return (reverse files, reverse dirs')
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collect files dirs' (entry:entries)
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| dirCruft entry = collect files dirs' entries
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| otherwise = do
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ifM (doesDirectoryExist entry)
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( collect files (entry:dirs') entries
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, collect (entry:files) dirs' entries
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)
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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", 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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{- Removes a file, which may or may not exist, and does not have to
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- be a regular file.
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-
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- Note that an exception is thrown if the file exists but
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- cannot be removed. -}
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nukeFile :: FilePath -> IO ()
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nukeFile file = void $ tryWhenExists go
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where
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#ifndef mingw32_HOST_OS
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go = removeLink file
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#else
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go = removeFile file
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#endif
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