-- * Actions on directories
createDirectory -- :: FilePath -> IO ()
+ , createDirectoryIfMissing -- :: Bool -> FilePath -> IO ()
, removeDirectory -- :: FilePath -> IO ()
+ , removeDirectoryRecursive -- :: FilePath -> IO ()
, renameDirectory -- :: FilePath -> FilePath -> IO ()
, getDirectoryContents -- :: FilePath -> IO [FilePath]
, getCurrentDirectory -- :: IO FilePath
, setCurrentDirectory -- :: FilePath -> IO ()
+ -- * Pre-defined directories
+ , getHomeDirectory
+ , getAppUserDataDirectory
+ , getUserDocumentsDirectory
+ , getTemporaryDirectory
+
-- * Actions on files
, removeFile -- :: FilePath -> IO ()
, renameFile -- :: FilePath -> FilePath -> IO ()
+ , copyFile -- :: FilePath -> FilePath -> IO ()
+
+ , canonicalizePath
+ , findExecutable
-- * Existence tests
, doesFileExist -- :: FilePath -> IO Bool
, getModificationTime -- :: FilePath -> IO ClockTime
) where
+import System.Directory.Internals
+import System.Environment ( getEnv )
+import System.IO.Error
+import Control.Monad ( when, unless )
+
#ifdef __NHC__
import Directory
-#elif defined(__HUGS__)
+#endif /* __NHC__ */
+
+#ifdef __HUGS__
import Hugs.Directory
-#else
+#endif /* __HUGS__ */
+
+import Foreign
+import Foreign.C
+{-# CFILES cbits/directory.c #-}
+
+#ifdef __GLASGOW_HASKELL__
import Prelude
import Control.Exception ( bracket )
import System.Posix.Internals
import System.Time ( ClockTime(..) )
import System.IO
-import System.IO.Error
-import Foreign
-import Foreign.C
-#ifdef __GLASGOW_HASKELL__
import GHC.IOBase ( IOException(..), IOErrorType(..), ioException )
-#endif
{- $intro
A directory contains a series of entries, each of which is a named
modifyBit False m b = m .&. (complement b)
modifyBit True m b = m .|. b
+
+copyPermissions :: FilePath -> FilePath -> IO ()
+copyPermissions source dest = do
+ allocaBytes sizeof_stat $ \ p_stat -> do
+ withCString source $ \p_source -> do
+ withCString dest $ \p_dest -> do
+ throwErrnoIfMinus1_ "copyPermissions" $ c_stat p_source p_stat
+ mode <- st_mode p_stat
+ throwErrnoIfMinus1_ "copyPermissions" $ c_chmod p_dest mode
+
-----------------------------------------------------------------------------
-- Implementation
createDirectory :: FilePath -> IO ()
createDirectory path = do
+ modifyIOError (`ioeSetFileName` path) $
withCString path $ \s -> do
throwErrnoIfMinus1Retry_ "createDirectory" $
mkdir s 0o777
+#else /* !__GLASGOW_HASKELL__ */
+
+copyPermissions :: FilePath -> FilePath -> IO ()
+copyPermissions fromFPath toFPath
+ = getPermissions fromFPath >>= setPermissions toFPath
+
+#endif
+
+-- | @'createDirectoryIfMissing' parents dir@ creates a new directory
+-- @dir@ if it doesn\'t exist. If the first argument is 'True'
+-- the function will also create all parent directories if they are missing.
+createDirectoryIfMissing :: Bool -- ^ Create its parents too?
+ -> FilePath -- ^ The path to the directory you want to make
+ -> IO ()
+createDirectoryIfMissing parents file = do
+ b <- doesDirectoryExist file
+ case (b,parents, file) of
+ (_, _, "") -> return ()
+ (True, _, _) -> return ()
+ (_, True, _) -> mapM_ (createDirectoryIfMissing False) (tail (pathParents file))
+ (_, False, _) -> createDirectory file
+
+#if __GLASGOW_HASKELL__
{- | @'removeDirectory' dir@ removes an existing directory /dir/. The
implementation may specify additional constraints which must be
satisfied before a directory can be removed (e.g. the directory has to
modifyIOError (`ioeSetFileName` path) $
withCString path $ \s ->
throwErrnoIfMinus1Retry_ "removeDirectory" (c_rmdir s)
+#endif
+-- | @'removeDirectoryRecursive' dir@ removes an existing directory /dir/
+-- together with its content and all subdirectories. Be careful,
+-- if the directory contains symlinks, the function will follow them.
+removeDirectoryRecursive :: FilePath -> IO ()
+removeDirectoryRecursive startLoc = do
+ cont <- getDirectoryContents startLoc
+ sequence_ [rm (startLoc `joinFileName` x) | x <- cont, x /= "." && x /= ".."]
+ removeDirectory startLoc
+ where
+ rm :: FilePath -> IO ()
+ rm f = do temp <- try (removeFile f)
+ case temp of
+ Left e -> do isDir <- doesDirectoryExist f
+ -- If f is not a directory, re-throw the error
+ unless isDir $ ioError e
+ removeDirectoryRecursive f
+ Right _ -> return ()
+
+#if __GLASGOW_HASKELL__
{- |'removeFile' /file/ removes the directory entry for an existing file
/file/, where /file/ is not itself a directory. The
implementation may specify additional constraints which must be
withCString npath $ \s2 ->
throwErrnoIfMinus1Retry_ "renameFile" (c_rename s1 s2)
+#endif /* __GLASGOW_HASKELL__ */
+
+{- |@'copyFile' old new@ copies the existing file from /old/ to /new/.
+If the /new/ file already exists, it is atomically replaced by the /old/ file.
+Neither path may refer to an existing directory. The permissions of /old/ are
+copied to /new/, if possible.
+-}
+
+{- NOTES:
+
+It's tempting to try to remove the target file before opening it for
+writing. This could be useful: for example if the target file is an
+executable that is in use, writing will fail, but unlinking first
+would succeed.
+
+However, it certainly isn't always what you want.
+
+ * if the target file is hardlinked, removing it would break
+ the hard link, but just opening would preserve it.
+
+ * opening and truncating will preserve permissions and
+ ACLs on the target.
+
+ * If the destination file is read-only in a writable directory,
+ we might want copyFile to fail. Removing the target first
+ would succeed, however.
+
+ * If the destination file is special (eg. /dev/null), removing
+ it is probably not the right thing. Copying to /dev/null
+ should leave /dev/null intact, not replace it with a plain
+ file.
+
+ * There's a small race condition between removing the target and
+ opening it for writing during which time someone might
+ create it again.
+-}
+copyFile :: FilePath -> FilePath -> IO ()
+copyFile fromFPath toFPath =
+#if (!(defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ > 600))
+ do readFile fromFPath >>= writeFile toFPath
+ try (copyPermissions fromFPath toFPath)
+ return ()
+#else
+ (bracket (openBinaryFile fromFPath ReadMode) hClose $ \hFrom ->
+ bracket (openBinaryFile toFPath WriteMode) hClose $ \hTo ->
+ allocaBytes bufferSize $ \buffer -> do
+ copyContents hFrom hTo buffer
+ try (copyPermissions fromFPath toFPath)
+ return ()) `catch` (ioError . changeFunName)
+ where
+ bufferSize = 1024
+
+ changeFunName (IOError h iot fun str mb_fp) = IOError h iot "copyFile" str mb_fp
+
+ copyContents hFrom hTo buffer = do
+ count <- hGetBuf hFrom buffer bufferSize
+ when (count > 0) $ do
+ hPutBuf hTo buffer count
+ copyContents hFrom hTo buffer
+#endif
+
+-- | Given path referring to a file or directory, returns a
+-- canonicalized path, with the intent that two paths referring
+-- to the same file\/directory will map to the same canonicalized
+-- path. Note that it is impossible to guarantee that the
+-- implication (same file\/dir \<=\> same canonicalizedPath) holds
+-- in either direction: this function can make only a best-effort
+-- attempt.
+canonicalizePath :: FilePath -> IO FilePath
+canonicalizePath fpath =
+ withCString fpath $ \pInPath ->
+ allocaBytes long_path_size $ \pOutPath ->
+#if defined(mingw32_HOST_OS)
+ alloca $ \ppFilePart ->
+ do c_GetFullPathName pInPath (fromIntegral long_path_size) pOutPath ppFilePart
+#else
+ do c_realpath pInPath pOutPath
+#endif
+ peekCString pOutPath
+
+#if defined(mingw32_HOST_OS)
+foreign import stdcall unsafe "GetFullPathNameA"
+ c_GetFullPathName :: CString
+ -> CInt
+ -> CString
+ -> Ptr CString
+ -> IO CInt
+#else
+foreign import ccall unsafe "realpath"
+ c_realpath :: CString
+ -> CString
+ -> IO CString
+#endif
+
+-- | Given an executable file name, searches for such file
+-- in the directories listed in system PATH. The returned value
+-- is the path to the found executable or Nothing if there isn't
+-- such executable. For example (findExecutable \"ghc\")
+-- gives you the path to GHC.
+findExecutable :: String -> IO (Maybe FilePath)
+findExecutable binary =
+#if defined(mingw32_HOST_OS)
+ withCString binary $ \c_binary ->
+ withCString ('.':exeExtension) $ \c_ext ->
+ allocaBytes long_path_size $ \pOutPath ->
+ alloca $ \ppFilePart -> do
+ res <- c_SearchPath nullPtr c_binary c_ext (fromIntegral long_path_size) pOutPath ppFilePart
+ if res > 0 && res < fromIntegral long_path_size
+ then do fpath <- peekCString pOutPath
+ return (Just fpath)
+ else return Nothing
+
+foreign import stdcall unsafe "SearchPathA"
+ c_SearchPath :: CString
+ -> CString
+ -> CString
+ -> CInt
+ -> CString
+ -> Ptr CString
+ -> IO CInt
+#else
+ do
+ path <- getEnv "PATH"
+ search (parseSearchPath path)
+ where
+ fileName = binary `joinFileExt` exeExtension
+
+ search :: [FilePath] -> IO (Maybe FilePath)
+ search [] = return Nothing
+ search (d:ds) = do
+ let path = d `joinFileName` fileName
+ b <- doesFileExist path
+ if b then return (Just path)
+ else search ds
+#endif
+
+
+#ifdef __GLASGOW_HASKELL__
{- |@'getDirectoryContents' dir@ returns a list of /all/ entries
in /dir/.
i = (length name) - 1
ec = name !! i
-foreign import ccall unsafe "__hscore_long_path_size"
- long_path_size :: Int
-
-foreign import ccall unsafe "__hscore_R_OK" r_OK :: CMode
-foreign import ccall unsafe "__hscore_W_OK" w_OK :: CMode
-foreign import ccall unsafe "__hscore_X_OK" x_OK :: CMode
+foreign import ccall unsafe "__hscore_R_OK" r_OK :: CInt
+foreign import ccall unsafe "__hscore_W_OK" w_OK :: CInt
+foreign import ccall unsafe "__hscore_X_OK" x_OK :: CInt
foreign import ccall unsafe "__hscore_S_IRUSR" s_IRUSR :: CMode
foreign import ccall unsafe "__hscore_S_IWUSR" s_IWUSR :: CMode
foreign import ccall unsafe "__hscore_S_IXUSR" s_IXUSR :: CMode
+foreign import ccall unsafe "__hscore_long_path_size"
+ long_path_size :: Int
+
+#else
+long_path_size :: Int
+long_path_size = 2048 -- // guess?
+
+#endif /* __GLASGOW_HASKELL__ */
+
+{- | Returns the current user's home directory.
+
+The directory returned is expected to be writable by the current user,
+but note that it isn't generally considered good practice to store
+application-specific data here; use 'getAppUserDataDirectory'
+instead.
+
+On Unix, 'getHomeDirectory' returns the value of the @HOME@
+environment variable. On Windows, the system is queried for a
+suitable path; a typical path might be
+@C:/Documents And Settings/user@.
+
+The operation may fail with:
+
+* 'UnsupportedOperation'
+The operating system has no notion of home directory.
+
+* 'isDoesNotExistError'
+The home directory for the current user does not exist, or
+cannot be found.
+-}
+getHomeDirectory :: IO FilePath
+getHomeDirectory =
+#if defined(mingw32_HOST_OS)
+ allocaBytes long_path_size $ \pPath -> do
+ r <- c_SHGetFolderPath nullPtr csidl_PROFILE nullPtr 0 pPath
+ if (r < 0)
+ then do
+ r <- c_SHGetFolderPath nullPtr csidl_WINDOWS nullPtr 0 pPath
+ when (r < 0) (raiseUnsupported "System.Directory.getHomeDirectory")
+ else return ()
+ peekCString pPath
+#else
+ getEnv "HOME"
+#endif
+
+{- | Returns the pathname of a directory in which application-specific
+data for the current user can be stored. The result of
+'getAppUserDataDirectory' for a given application is specific to
+the current user.
+
+The argument should be the name of the application, which will be used
+to construct the pathname (so avoid using unusual characters that
+might result in an invalid pathname).
+
+Note: the directory may not actually exist, and may need to be created
+first. It is expected that the parent directory exists and is
+writable.
+
+On Unix, this function returns @$HOME\/.appName@. On Windows, a
+typical path might be
+
+> C:/Documents And Settings/user/Application Data/appName
+
+The operation may fail with:
+
+* 'UnsupportedOperation'
+The operating system has no notion of application-specific data directory.
+
+* 'isDoesNotExistError'
+The home directory for the current user does not exist, or
+cannot be found.
+-}
+getAppUserDataDirectory :: String -> IO FilePath
+getAppUserDataDirectory appName = do
+#if defined(mingw32_HOST_OS)
+ allocaBytes long_path_size $ \pPath -> do
+ r <- c_SHGetFolderPath nullPtr csidl_APPDATA nullPtr 0 pPath
+ when (r<0) (raiseUnsupported "System.Directory.getAppUserDataDirectory")
+ s <- peekCString pPath
+ return (s++'\\':appName)
+#else
+ path <- getEnv "HOME"
+ return (path++'/':'.':appName)
+#endif
+
+{- | Returns the current user's document directory.
+
+The directory returned is expected to be writable by the current user,
+but note that it isn't generally considered good practice to store
+application-specific data here; use 'getAppUserDataDirectory'
+instead.
+
+On Unix, 'getUserDocumentsDirectory' returns the value of the @HOME@
+environment variable. On Windows, the system is queried for a
+suitable path; a typical path might be
+@C:\/Documents and Settings\/user\/My Documents@.
+
+The operation may fail with:
+
+* 'UnsupportedOperation'
+The operating system has no notion of document directory.
+
+* 'isDoesNotExistError'
+The document directory for the current user does not exist, or
+cannot be found.
+-}
+getUserDocumentsDirectory :: IO FilePath
+getUserDocumentsDirectory = do
+#if defined(mingw32_HOST_OS)
+ allocaBytes long_path_size $ \pPath -> do
+ r <- c_SHGetFolderPath nullPtr csidl_PERSONAL nullPtr 0 pPath
+ when (r<0) (raiseUnsupported "System.Directory.getUserDocumentsDirectory")
+ peekCString pPath
+#else
+ getEnv "HOME"
+#endif
+
+{- | Returns the current directory for temporary files.
+
+On Unix, 'getTemporaryDirectory' returns the value of the @TMPDIR@
+environment variable or \"\/tmp\" if the variable isn\'t defined.
+On Windows, the function checks for the existence of environment variables in
+the following order and uses the first path found:
+
+*
+TMP environment variable.
+
+*
+TEMP environment variable.
+
+*
+USERPROFILE environment variable.
+
+*
+The Windows directory
+
+The operation may fail with:
+
+* 'UnsupportedOperation'
+The operating system has no notion of temporary directory.
+
+The function doesn\'t verify whether the path exists.
+-}
+getTemporaryDirectory :: IO FilePath
+getTemporaryDirectory = do
+#if defined(mingw32_HOST_OS)
+ allocaBytes long_path_size $ \pPath -> do
+ r <- c_GetTempPath (fromIntegral long_path_size) pPath
+ peekCString pPath
+#else
+ catch (getEnv "TMPDIR") (\ex -> return "/tmp")
+#endif
+
+#if defined(mingw32_HOST_OS)
+foreign import ccall unsafe "__hscore_getFolderPath"
+ c_SHGetFolderPath :: Ptr ()
+ -> CInt
+ -> Ptr ()
+ -> CInt
+ -> CString
+ -> IO CInt
+foreign import ccall unsafe "__hscore_CSIDL_PROFILE" csidl_PROFILE :: CInt
+foreign import ccall unsafe "__hscore_CSIDL_APPDATA" csidl_APPDATA :: CInt
+foreign import ccall unsafe "__hscore_CSIDL_WINDOWS" csidl_WINDOWS :: CInt
+foreign import ccall unsafe "__hscore_CSIDL_PERSONAL" csidl_PERSONAL :: CInt
+
+foreign import stdcall unsafe "GetTempPathA" c_GetTempPath :: CInt -> CString -> IO CInt
+
+raiseUnsupported loc =
+ ioException (IOError Nothing UnsupportedOperation loc "unsupported operation" Nothing)
+
#endif
projects / haskell-directory.git / blobdiff