107 lines
3.2 KiB
Haskell
107 lines
3.2 KiB
Haskell
{- 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 System.IO.Unsafe (unsafeInterleaveIO)
|
|
|
|
import Utility.SafeCommand
|
|
import Utility.TempFile
|
|
import Utility.Exception
|
|
import Utility.Monad
|
|
import Utility.Path
|
|
|
|
dirCruft :: FilePath -> Bool
|
|
dirCruft "." = True
|
|
dirCruft ".." = True
|
|
dirCruft _ = False
|
|
|
|
{- Lists the contents of a directory.
|
|
- Unlike getDirectoryContents, paths are not relative to the directory. -}
|
|
dirContents :: FilePath -> IO [FilePath]
|
|
dirContents d = map (d </>) . filter (not . dirCruft) <$> getDirectoryContents d
|
|
|
|
{- Gets contents of directory, and then its subdirectories, recursively,
|
|
- and lazily. -}
|
|
dirContentsRecursive :: FilePath -> IO [FilePath]
|
|
dirContentsRecursive topdir = dirContentsRecursive' topdir [""]
|
|
|
|
dirContentsRecursive' :: FilePath -> [FilePath] -> IO [FilePath]
|
|
dirContentsRecursive' _ [] = return []
|
|
dirContentsRecursive' topdir (dir:dirs) = unsafeInterleaveIO $ do
|
|
(files, dirs') <- collect [] [] =<< dirContents (topdir </> dir)
|
|
files' <- dirContentsRecursive' topdir (dirs' ++ dirs)
|
|
return (files ++ files')
|
|
where
|
|
collect files dirs' [] = return (reverse files, reverse dirs')
|
|
collect files dirs' (entry:entries)
|
|
| dirCruft entry = collect files dirs' entries
|
|
| otherwise = do
|
|
let dirEntry = dir </> entry
|
|
ifM (doesDirectoryExist $ topdir </> dirEntry)
|
|
( collect files (dirEntry:dirs') entries
|
|
, collect (dirEntry:files) dirs' entries
|
|
)
|
|
|
|
{- 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
|
|
|
|
{- Removes a file, which may or may not exist.
|
|
-
|
|
- Note that an exception is thrown if the file exists but
|
|
- cannot be removed. -}
|
|
nukeFile :: FilePath -> IO ()
|
|
nukeFile file = whenM (doesFileExist file) $ removeFile file
|
|
|
|
{- 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
|