{-# OPTIONS_GHC -w #-}
-- XXX We get some warnings on Windows
-----------------------------------------------------------------------------
-- |
-- Module : System.Directory
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : stable
-- Portability : portable
--
-- System-independent interface to directory manipulation.
--
-----------------------------------------------------------------------------
module System.Directory
(
-- $intro
-- * Actions on directories
createDirectory -- :: FilePath -> IO ()
#ifndef __NHC__
, createDirectoryIfMissing -- :: Bool -> FilePath -> IO ()
#endif
, 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
, makeRelativeToCurrentDirectory
, findExecutable
-- * Existence tests
, doesFileExist -- :: FilePath -> IO Bool
, doesDirectoryExist -- :: FilePath -> IO Bool
-- * Permissions
-- $permissions
, Permissions(
Permissions,
readable, -- :: Permissions -> Bool
writable, -- :: Permissions -> Bool
executable, -- :: Permissions -> Bool
searchable -- :: Permissions -> Bool
)
, getPermissions -- :: FilePath -> IO Permissions
, setPermissions -- :: FilePath -> Permissions -> IO ()
, copyPermissions
-- * Timestamps
, getModificationTime -- :: FilePath -> IO ClockTime
) where
import Prelude hiding ( catch )
import qualified Prelude
import Control.Monad (guard)
import System.Environment ( getEnv )
import System.FilePath
import System.IO
import System.IO.Error hiding ( catch, try )
import Control.Monad ( when, unless )
import Control.Exception.Base
#ifdef __NHC__
import Directory -- hiding ( getDirectoryContents
-- , doesDirectoryExist, doesFileExist
-- , getModificationTime )
import System (system)
#endif /* __NHC__ */
#ifdef __HUGS__
import Hugs.Directory
#endif /* __HUGS__ */
import Foreign
import Foreign.C
{-# CFILES cbits/directory.c #-}
import System.Time ( ClockTime(..) )
#ifdef __GLASGOW_HASKELL__
#if __GLASGOW_HASKELL__ >= 611
import GHC.IO.Exception ( IOException(..), IOErrorType(..), ioException )
#else
import GHC.IOBase ( IOException(..), IOErrorType(..), ioException )
#endif
#ifdef mingw32_HOST_OS
import System.Posix.Types
import System.Posix.Internals
import qualified System.Win32 as Win32
#else
import qualified System.Posix as Posix
#endif
{- $intro
A directory contains a series of entries, each of which is a named
reference to a file system object (file, directory etc.). Some
entries may be hidden, inaccessible, or have some administrative
function (e.g. `.' or `..' under POSIX
), but in
this standard all such entries are considered to form part of the
directory contents. Entries in sub-directories are not, however,
considered to form part of the directory contents.
Each file system object is referenced by a /path/. There is
normally at least one absolute path to each file system object. In
some operating systems, it may also be possible to have paths which
are relative to the current directory.
-}
-----------------------------------------------------------------------------
-- Permissions
{- $permissions
The 'Permissions' type is used to record whether certain operations are
permissible on a file\/directory. 'getPermissions' and 'setPermissions'
get and set these permissions, respectively. Permissions apply both to
files and directories. For directories, the executable field will be
'False', and for files the searchable field will be 'False'. Note that
directories may be searchable without being readable, if permission has
been given to use them as part of a path, but not to examine the
directory contents.
Note that to change some, but not all permissions, a construct on the following lines must be used.
> makeReadable f = do
> p <- getPermissions f
> setPermissions f (p {readable = True})
-}
data Permissions
= Permissions {
readable, writable,
executable, searchable :: Bool
} deriving (Eq, Ord, Read, Show)
{- |The 'getPermissions' operation returns the
permissions for the file or directory.
The operation may fail with:
* 'isPermissionError' if the user is not permitted to access
the permissions; or
* 'isDoesNotExistError' if the file or directory does not exist.
-}
getPermissions :: FilePath -> IO Permissions
getPermissions name = do
#ifdef mingw32_HOST_OS
withFilePath name $ \s -> do
-- stat() does a better job of guessing the permissions on Windows
-- than access() does. e.g. for execute permission, it looks at the
-- filename extension :-)
--
-- I tried for a while to do this properly, using the Windows security API,
-- and eventually gave up. getPermissions is a flawed API anyway. -- SimonM
allocaBytes sizeof_stat $ \ p_stat -> do
throwErrnoIfMinus1_ "getPermissions" $ c_stat s p_stat
mode <- st_mode p_stat
let usr_read = mode .&. s_IRUSR
let usr_write = mode .&. s_IWUSR
let usr_exec = mode .&. s_IXUSR
let is_dir = mode .&. s_IFDIR
return (
Permissions {
readable = usr_read /= 0,
writable = usr_write /= 0,
executable = is_dir == 0 && usr_exec /= 0,
searchable = is_dir /= 0 && usr_exec /= 0
}
)
#else
read_ok <- Posix.fileAccess name True False False
write_ok <- Posix.fileAccess name False True False
exec_ok <- Posix.fileAccess name False False True
stat <- Posix.getFileStatus name
let is_dir = Posix.isDirectory stat
return (
Permissions {
readable = read_ok,
writable = write_ok,
executable = not is_dir && exec_ok,
searchable = is_dir && exec_ok
}
)
#endif
{- |The 'setPermissions' operation sets the
permissions for the file or directory.
The operation may fail with:
* 'isPermissionError' if the user is not permitted to set
the permissions; or
* 'isDoesNotExistError' if the file or directory does not exist.
-}
setPermissions :: FilePath -> Permissions -> IO ()
setPermissions name (Permissions r w e s) = do
#ifdef mingw32_HOST_OS
allocaBytes sizeof_stat $ \ p_stat -> do
withFilePath name $ \p_name -> do
throwErrnoIfMinus1_ "setPermissions" $ do
c_stat p_name p_stat
mode <- st_mode p_stat
let mode1 = modifyBit r mode s_IRUSR
let mode2 = modifyBit w mode1 s_IWUSR
let mode3 = modifyBit (e || s) mode2 s_IXUSR
c_wchmod p_name mode3
where
modifyBit :: Bool -> CMode -> CMode -> CMode
modifyBit False m b = m .&. (complement b)
modifyBit True m b = m .|. b
#else
stat <- Posix.getFileStatus name
let mode = Posix.fileMode stat
let mode1 = modifyBit r mode Posix.ownerReadMode
let mode2 = modifyBit w mode1 Posix.ownerWriteMode
let mode3 = modifyBit (e || s) mode2 Posix.ownerExecuteMode
Posix.setFileMode name mode3
where
modifyBit :: Bool -> Posix.FileMode -> Posix.FileMode -> Posix.FileMode
modifyBit False m b = m .&. (complement b)
modifyBit True m b = m .|. b
#endif
#ifdef mingw32_HOST_OS
foreign import ccall unsafe "_wchmod"
c_wchmod :: CWString -> CMode -> IO CInt
#endif
copyPermissions :: FilePath -> FilePath -> IO ()
copyPermissions source dest = do
#ifdef mingw32_HOST_OS
allocaBytes sizeof_stat $ \ p_stat -> do
withFilePath source $ \p_source -> do
withFilePath dest $ \p_dest -> do
throwErrnoIfMinus1_ "copyPermissions" $ c_stat p_source p_stat
mode <- st_mode p_stat
throwErrnoIfMinus1_ "copyPermissions" $ c_wchmod p_dest mode
#else
stat <- Posix.getFileStatus source
let mode = Posix.fileMode stat
Posix.setFileMode dest mode
#endif
-----------------------------------------------------------------------------
-- Implementation
{- |@'createDirectory' dir@ creates a new directory @dir@ which is
initially empty, or as near to empty as the operating system
allows.
The operation may fail with:
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EROFS, EACCES]@
* 'isAlreadyExistsError' \/ 'AlreadyExists'
The operand refers to a directory that already exists.
@ [EEXIST]@
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'InvalidArgument'
The operand is not a valid directory name.
@[ENAMETOOLONG, ELOOP]@
* 'NoSuchThing'
There is no path to the directory.
@[ENOENT, ENOTDIR]@
* 'ResourceExhausted'
Insufficient resources (virtual memory, process file descriptors,
physical disk space, etc.) are available to perform the operation.
@[EDQUOT, ENOSPC, ENOMEM, EMLINK]@
* 'InappropriateType'
The path refers to an existing non-directory object.
@[EEXIST]@
-}
createDirectory :: FilePath -> IO ()
createDirectory path = do
#ifdef mingw32_HOST_OS
Win32.createDirectory path Nothing
#else
Posix.createDirectory path 0o777
#endif
#else /* !__GLASGOW_HASKELL__ */
copyPermissions :: FilePath -> FilePath -> IO ()
copyPermissions fromFPath toFPath
= getPermissions fromFPath >>= setPermissions toFPath
#endif
#ifndef __NHC__
-- | @'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 create_parents path0
| create_parents = createDirs (parents path0)
| otherwise = createDirs (take 1 (parents path0))
where
parents = reverse . scanl1 (>) . splitDirectories . normalise
createDirs [] = return ()
createDirs (dir:[]) = createDir dir throw
createDirs (dir:dirs) =
createDir dir $ \_ -> do
createDirs dirs
createDir dir throw
createDir :: FilePath -> (IOException -> IO ()) -> IO ()
createDir dir notExistHandler = do
r <- try $ createDirectory dir
case (r :: Either IOException ()) of
Right () -> return ()
Left e
| isDoesNotExistError e -> notExistHandler e
-- createDirectory (and indeed POSIX mkdir) does not distinguish
-- between a dir already existing and a file already existing. So we
-- check for it here. Unfortunately there is a slight race condition
-- here, but we think it is benign. It could report an exeption in
-- the case that the dir did exist but another process deletes the
-- directory and creates a file in its place before we can check
-- that the directory did indeed exist.
| isAlreadyExistsError e -> (do
#ifdef mingw32_HOST_OS
withFileStatus "createDirectoryIfMissing" dir $ \st -> do
isDir <- isDirectory st
if isDir then return ()
else throw e
#else
stat <- Posix.getFileStatus dir
if Posix.isDirectory stat
then return ()
else throw e
#endif
) `catch` ((\_ -> return ()) :: IOException -> IO ())
| otherwise -> throw e
#endif /* !__NHC__ */
#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
be empty, or may not be in use by other processes). It is not legal
for an implementation to partially remove a directory unless the
entire directory is removed. A conformant implementation need not
support directory removal in all situations (e.g. removal of the root
directory).
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
EIO
* 'InvalidArgument'
The operand is not a valid directory name.
[ENAMETOOLONG, ELOOP]
* 'isDoesNotExistError' \/ 'NoSuchThing'
The directory does not exist.
@[ENOENT, ENOTDIR]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EROFS, EACCES, EPERM]@
* 'UnsatisfiedConstraints'
Implementation-dependent constraints are not satisfied.
@[EBUSY, ENOTEMPTY, EEXIST]@
* 'UnsupportedOperation'
The implementation does not support removal in this situation.
@[EINVAL]@
* 'InappropriateType'
The operand refers to an existing non-directory object.
@[ENOTDIR]@
-}
removeDirectory :: FilePath -> IO ()
removeDirectory path =
#ifdef mingw32_HOST_OS
Win32.removeDirectory path
#else
Posix.removeDirectory path
#endif
#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 > 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 $ throw (e :: SomeException)
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
satisfied before a file can be removed (e.g. the file may not be in
use by other processes).
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'InvalidArgument'
The operand is not a valid file name.
@[ENAMETOOLONG, ELOOP]@
* 'isDoesNotExistError' \/ 'NoSuchThing'
The file does not exist.
@[ENOENT, ENOTDIR]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EROFS, EACCES, EPERM]@
* 'UnsatisfiedConstraints'
Implementation-dependent constraints are not satisfied.
@[EBUSY]@
* 'InappropriateType'
The operand refers to an existing directory.
@[EPERM, EINVAL]@
-}
removeFile :: FilePath -> IO ()
removeFile path =
#if mingw32_HOST_OS
Win32.deleteFile path
#else
Posix.removeLink path
#endif
{- |@'renameDirectory' old new@ changes the name of an existing
directory from /old/ to /new/. If the /new/ directory
already exists, it is atomically replaced by the /old/ directory.
If the /new/ directory is neither the /old/ directory nor an
alias of the /old/ directory, it is removed as if by
'removeDirectory'. A conformant implementation need not support
renaming directories in all situations (e.g. renaming to an existing
directory, or across different physical devices), but the constraints
must be documented.
On Win32 platforms, @renameDirectory@ fails if the /new/ directory already
exists.
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'InvalidArgument'
Either operand is not a valid directory name.
@[ENAMETOOLONG, ELOOP]@
* 'isDoesNotExistError' \/ 'NoSuchThing'
The original directory does not exist, or there is no path to the target.
@[ENOENT, ENOTDIR]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EROFS, EACCES, EPERM]@
* 'ResourceExhausted'
Insufficient resources are available to perform the operation.
@[EDQUOT, ENOSPC, ENOMEM, EMLINK]@
* 'UnsatisfiedConstraints'
Implementation-dependent constraints are not satisfied.
@[EBUSY, ENOTEMPTY, EEXIST]@
* 'UnsupportedOperation'
The implementation does not support renaming in this situation.
@[EINVAL, EXDEV]@
* 'InappropriateType'
Either path refers to an existing non-directory object.
@[ENOTDIR, EISDIR]@
-}
renameDirectory :: FilePath -> FilePath -> IO ()
renameDirectory opath npath = do
-- XXX this test isn't performed atomically with the following rename
#ifdef mingw32_HOST_OS
-- ToDo: use Win32 API
withFileStatus "renameDirectory" opath $ \st -> do
is_dir <- isDirectory st
#else
stat <- Posix.getFileStatus opath
let is_dir = Posix.fileMode stat .&. Posix.directoryMode /= 0
#endif
if (not is_dir)
then ioException (ioeSetErrorString
(mkIOError InappropriateType "renameDirectory" Nothing (Just opath))
"not a directory")
else do
#ifdef mingw32_HOST_OS
Win32.moveFileEx opath npath Win32.mOVEFILE_REPLACE_EXISTING
#else
Posix.rename opath npath
#endif
{- |@'renameFile' old new@ changes the name of an existing file system
object from /old/ to /new/. If the /new/ object already
exists, it is atomically replaced by the /old/ object. Neither
path may refer to an existing directory. A conformant implementation
need not support renaming files in all situations (e.g. renaming
across different physical devices), but the constraints must be
documented.
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'InvalidArgument'
Either operand is not a valid file name.
@[ENAMETOOLONG, ELOOP]@
* 'isDoesNotExistError' \/ 'NoSuchThing'
The original file does not exist, or there is no path to the target.
@[ENOENT, ENOTDIR]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EROFS, EACCES, EPERM]@
* 'ResourceExhausted'
Insufficient resources are available to perform the operation.
@[EDQUOT, ENOSPC, ENOMEM, EMLINK]@
* 'UnsatisfiedConstraints'
Implementation-dependent constraints are not satisfied.
@[EBUSY]@
* 'UnsupportedOperation'
The implementation does not support renaming in this situation.
@[EXDEV]@
* 'InappropriateType'
Either path refers to an existing directory.
@[ENOTDIR, EISDIR, EINVAL, EEXIST, ENOTEMPTY]@
-}
renameFile :: FilePath -> FilePath -> IO ()
renameFile opath npath = do
-- XXX this test isn't performed atomically with the following rename
#ifdef mingw32_HOST_OS
-- ToDo: use Win32 API
withFileOrSymlinkStatus "renameFile" opath $ \st -> do
is_dir <- isDirectory st
#else
stat <- Posix.getSymbolicLinkStatus opath
let is_dir = Posix.isDirectory stat
#endif
if is_dir
then ioException (ioeSetErrorString
(mkIOError InappropriateType "renameFile" Nothing (Just opath))
"is a directory")
else do
#ifdef mingw32_HOST_OS
Win32.moveFileEx opath npath Win32.mOVEFILE_REPLACE_EXISTING
#else
Posix.rename opath npath
#endif
#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.
-}
copyFile :: FilePath -> FilePath -> IO ()
#ifdef __NHC__
copyFile fromFPath toFPath =
do readFile fromFPath >>= writeFile toFPath
Prelude.catch (copyPermissions fromFPath toFPath)
(\_ -> return ())
#else
copyFile fromFPath toFPath =
copy `Prelude.catch` (\exc -> throw $ ioeSetLocation exc "copyFile")
where copy = bracket (openBinaryFile fromFPath ReadMode) hClose $ \hFrom ->
bracketOnError openTmp cleanTmp $ \(tmpFPath, hTmp) ->
do allocaBytes bufferSize $ copyContents hFrom hTmp
hClose hTmp
ignoreIOExceptions $ copyPermissions fromFPath tmpFPath
renameFile tmpFPath toFPath
openTmp = openBinaryTempFile (takeDirectory toFPath) ".copyFile.tmp"
cleanTmp (tmpFPath, hTmp)
= do ignoreIOExceptions $ hClose hTmp
ignoreIOExceptions $ removeFile tmpFPath
bufferSize = 1024
copyContents hFrom hTo buffer = do
count <- hGetBuf hFrom buffer bufferSize
when (count > 0) $ do
hPutBuf hTo buffer count
copyContents hFrom hTo buffer
ignoreIOExceptions io = io `catch` ioExceptionIgnorer
ioExceptionIgnorer :: IOException -> IO ()
ioExceptionIgnorer _ = return ()
#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 =
#if defined(mingw32_HOST_OS)
do path <- Win32.getFullPathName fpath
#else
withCString fpath $ \pInPath ->
allocaBytes long_path_size $ \pOutPath ->
do c_realpath pInPath pOutPath
path <- peekCString pOutPath
#endif
return (normalise path)
-- normalise does more stuff, like upper-casing the drive letter
#if !defined(mingw32_HOST_OS)
foreign import ccall unsafe "realpath"
c_realpath :: CString
-> CString
-> IO CString
#endif
-- | 'makeRelative' the current directory.
makeRelativeToCurrentDirectory :: FilePath -> IO FilePath
makeRelativeToCurrentDirectory x = do
cur <- getCurrentDirectory
return $ makeRelative cur x
-- | 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 an executable with the given
-- name was not found. For example (findExecutable \"ghc\") gives you
-- the path to GHC.
--
-- The path returned by 'findExecutable' corresponds to the
-- program that would be executed by 'System.Process.createProcess'
-- when passed the same string (as a RawCommand, not a ShellCommand).
--
-- On Windows, 'findExecutable' calls the Win32 function 'SearchPath',
-- which may search other places before checking the directories in
-- @PATH@. Where it actually searches depends on registry settings,
-- but notably includes the directory containing the current
-- executable. See
-- for more
-- details.
--
findExecutable :: String -> IO (Maybe FilePath)
findExecutable binary =
#if defined(mingw32_HOST_OS)
Win32.searchPath Nothing binary ('.':exeExtension)
#else
do
path <- getEnv "PATH"
search (splitSearchPath path)
where
fileName = binary <.> exeExtension
search :: [FilePath] -> IO (Maybe FilePath)
search [] = return Nothing
search (d:ds) = do
let path = d > 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/.
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'InvalidArgument'
The operand is not a valid directory name.
@[ENAMETOOLONG, ELOOP]@
* 'isDoesNotExistError' \/ 'NoSuchThing'
The directory does not exist.
@[ENOENT, ENOTDIR]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EACCES]@
* 'ResourceExhausted'
Insufficient resources are available to perform the operation.
@[EMFILE, ENFILE]@
* 'InappropriateType'
The path refers to an existing non-directory object.
@[ENOTDIR]@
-}
getDirectoryContents :: FilePath -> IO [FilePath]
getDirectoryContents path =
modifyIOError ((`ioeSetFileName` path) .
(`ioeSetLocation` "getDirectoryContents")) $ do
#ifndef mingw32_HOST_OS
bracket
(Posix.openDirStream path)
Posix.closeDirStream
loop
where
loop dirp = do
e <- Posix.readDirStream dirp
if null e then return [] else do
es <- loop dirp
return (e:es)
#else
bracket
(Win32.findFirstFile (path > "*"))
(\(h,_) -> Win32.findClose h)
(\(h,fdat) -> loop h fdat [])
where
-- we needn't worry about empty directories: adirectory always
-- has at least "." and ".." entries
loop :: Win32.HANDLE -> Win32.FindData -> [FilePath] -> IO [FilePath]
loop h fdat acc = do
filename <- Win32.getFindDataFileName fdat
more <- Win32.findNextFile h fdat
if more
then loop h fdat (filename:acc)
else return (filename:acc)
-- no need to reverse, ordering is undefined
#endif /* mingw32 */
#endif /* __GLASGOW_HASKELL__ */
{- |If the operating system has a notion of current directories,
'getCurrentDirectory' returns an absolute path to the
current directory of the calling process.
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'isDoesNotExistError' \/ 'NoSuchThing'
There is no path referring to the current directory.
@[EPERM, ENOENT, ESTALE...]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EACCES]@
* 'ResourceExhausted'
Insufficient resources are available to perform the operation.
* 'UnsupportedOperation'
The operating system has no notion of current directory.
-}
#ifdef __GLASGOW_HASKELL__
getCurrentDirectory :: IO FilePath
getCurrentDirectory = do
#ifdef mingw32_HOST_OS
Win32.getCurrentDirectory
#else
Posix.getWorkingDirectory
#endif
{- |If the operating system has a notion of current directories,
@'setCurrentDirectory' dir@ changes the current
directory of the calling process to /dir/.
The operation may fail with:
* 'HardwareFault'
A physical I\/O error has occurred.
@[EIO]@
* 'InvalidArgument'
The operand is not a valid directory name.
@[ENAMETOOLONG, ELOOP]@
* 'isDoesNotExistError' \/ 'NoSuchThing'
The directory does not exist.
@[ENOENT, ENOTDIR]@
* 'isPermissionError' \/ 'PermissionDenied'
The process has insufficient privileges to perform the operation.
@[EACCES]@
* 'UnsupportedOperation'
The operating system has no notion of current directory, or the
current directory cannot be dynamically changed.
* 'InappropriateType'
The path refers to an existing non-directory object.
@[ENOTDIR]@
-}
setCurrentDirectory :: FilePath -> IO ()
setCurrentDirectory path =
#ifdef mingw32_HOST_OS
Win32.setCurrentDirectory path
#else
Posix.changeWorkingDirectory path
#endif
#endif /* __GLASGOW_HASKELL__ */
#ifdef __GLASGOW_HASKELL__
{- |The operation 'doesDirectoryExist' returns 'True' if the argument file
exists and is a directory, and 'False' otherwise.
-}
doesDirectoryExist :: FilePath -> IO Bool
doesDirectoryExist name =
#ifdef mingw32_HOST_OS
(withFileStatus "doesDirectoryExist" name $ \st -> isDirectory st)
#else
(do stat <- Posix.getFileStatus name
return (Posix.isDirectory stat))
#endif
`catch` ((\ _ -> return False) :: IOException -> IO Bool)
{- |The operation 'doesFileExist' returns 'True'
if the argument file exists and is not a directory, and 'False' otherwise.
-}
doesFileExist :: FilePath -> IO Bool
doesFileExist name =
#ifdef mingw32_HOST_OS
(withFileStatus "doesFileExist" name $ \st -> do b <- isDirectory st; return (not b))
#else
(do stat <- Posix.getFileStatus name
return (not (Posix.isDirectory stat)))
#endif
`catch` ((\ _ -> return False) :: IOException -> IO Bool)
{- |The 'getModificationTime' operation returns the
clock time at which the file or directory was last modified.
The operation may fail with:
* 'isPermissionError' if the user is not permitted to access
the modification time; or
* 'isDoesNotExistError' if the file or directory does not exist.
-}
getModificationTime :: FilePath -> IO ClockTime
getModificationTime name = do
#ifdef mingw32_HOST_OS
-- ToDo: use Win32 API
withFileStatus "getModificationTime" name $ \ st -> do
modificationTime st
#else
stat <- Posix.getFileStatus name
let realToInteger = round . realToFrac :: Real a => a -> Integer
return (TOD (realToInteger (Posix.modificationTime stat)) 0)
#endif
#endif /* __GLASGOW_HASKELL__ */
#ifdef mingw32_HOST_OS
withFileStatus :: String -> FilePath -> (Ptr CStat -> IO a) -> IO a
withFileStatus loc name f = do
modifyIOError (`ioeSetFileName` name) $
allocaBytes sizeof_stat $ \p ->
withFilePath (fileNameEndClean name) $ \s -> do
throwErrnoIfMinus1Retry_ loc (c_stat s p)
f p
withFileOrSymlinkStatus :: String -> FilePath -> (Ptr CStat -> IO a) -> IO a
withFileOrSymlinkStatus loc name f = do
modifyIOError (`ioeSetFileName` name) $
allocaBytes sizeof_stat $ \p ->
withFilePath name $ \s -> do
throwErrnoIfMinus1Retry_ loc (lstat s p)
f p
modificationTime :: Ptr CStat -> IO ClockTime
modificationTime stat = do
mtime <- st_mtime stat
let realToInteger = round . realToFrac :: Real a => a -> Integer
return (TOD (realToInteger (mtime :: CTime)) 0)
isDirectory :: Ptr CStat -> IO Bool
isDirectory stat = do
mode <- st_mode stat
return (s_isdir mode)
fileNameEndClean :: String -> String
fileNameEndClean name = if isDrive name then addTrailingPathSeparator name
else dropTrailingPathSeparator name
foreign import ccall unsafe "HsDirectory.h __hscore_S_IRUSR" s_IRUSR :: CMode
foreign import ccall unsafe "HsDirectory.h __hscore_S_IWUSR" s_IWUSR :: CMode
foreign import ccall unsafe "HsDirectory.h __hscore_S_IXUSR" s_IXUSR :: CMode
foreign import ccall unsafe "__hscore_S_IFDIR" s_IFDIR :: CMode
#endif
#ifdef __GLASGOW_HASKELL__
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 =
modifyIOError ((`ioeSetLocation` "getHomeDirectory")) $ do
#if defined(mingw32_HOST_OS)
r <- try $ Win32.sHGetFolderPath nullPtr Win32.cSIDL_PROFILE nullPtr 0
case (r :: Either IOException String) of
Right s -> return s
Left _ -> do
r1 <- try $ Win32.sHGetFolderPath nullPtr Win32.cSIDL_WINDOWS nullPtr 0
case r1 of
Right s -> return s
Left e -> ioError (e :: IOException)
#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
modifyIOError ((`ioeSetLocation` "getAppUserDataDirectory")) $ do
#if defined(mingw32_HOST_OS)
s <- Win32.sHGetFolderPath nullPtr Win32.cSIDL_APPDATA nullPtr 0
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
modifyIOError ((`ioeSetLocation` "getUserDocumentsDirectory")) $ do
#if defined(mingw32_HOST_OS)
Win32.sHGetFolderPath nullPtr Win32.cSIDL_PERSONAL nullPtr 0
#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)
Win32.getTemporaryDirectory
#else
getEnv "TMPDIR"
#if !__NHC__
`Prelude.catch` \e -> if isDoesNotExistError e then return "/tmp"
else throw e
#else
`Prelude.catch` (\ex -> return "/tmp")
#endif
#endif
-- ToDo: This should be determined via autoconf (AC_EXEEXT)
-- | Extension for executable files
-- (typically @\"\"@ on Unix and @\"exe\"@ on Windows or OS\/2)
exeExtension :: String
#ifdef mingw32_HOST_OS
exeExtension = "exe"
#else
exeExtension = ""
#endif