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|
--- Library for accessing the directory structure of the
--- underlying operating system.
---
--- @author Michael Hanus
--- @version January 2013
--- @category general
module Directory
( doesFileExist, doesDirectoryExist, fileSize, getModificationTime
, getCurrentDirectory, setCurrentDirectory
, getDirectoryContents, createDirectory, createDirectoryIfMissing
, removeDirectory, renameDirectory
, getHomeDirectory, getTemporaryDirectory
, getAbsolutePath
, removeFile, renameFile, copyFile
) where
import FilePath (FilePath, (</>), splitDirectories, isAbsolute, normalise)
import List (isPrefixOf, scanl1, last)
import System (getEnviron, isWindows)
import Time (ClockTime)
--- Returns true if the argument is the name of an existing file.
doesFileExist :: FilePath -> IO Bool
doesFileExist fname = prim_doesFileExist $## fname
prim_doesFileExist :: FilePath -> IO Bool
prim_doesFileExist external
--- Returns true if the argument is the name of an existing directory.
doesDirectoryExist :: FilePath -> IO Bool
doesDirectoryExist dir = prim_doesDirectoryExist $## dir
prim_doesDirectoryExist :: FilePath -> IO Bool
prim_doesDirectoryExist external
--- Returns the size of the file.
fileSize :: FilePath -> IO Int
fileSize fname = prim_fileSize $## fname
prim_fileSize :: FilePath -> IO Int
prim_fileSize external
--- Returns the modification time of the file.
getModificationTime :: FilePath -> IO ClockTime
getModificationTime fname = prim_getModificationTime $## fname
prim_getModificationTime :: FilePath -> IO ClockTime
prim_getModificationTime external
--- Returns the current working directory.
getCurrentDirectory :: IO FilePath
getCurrentDirectory external
--- Sets the current working directory.
setCurrentDirectory :: FilePath -> IO ()
setCurrentDirectory dir = prim_setCurrentDirectory $## dir
prim_setCurrentDirectory :: FilePath -> IO ()
prim_setCurrentDirectory external
--- Returns the list of all entries in a directory.
getDirectoryContents :: FilePath -> IO [FilePath]
getDirectoryContents dir = prim_getDirectoryContents $## dir
prim_getDirectoryContents :: FilePath -> IO [FilePath]
prim_getDirectoryContents external
--- Creates a new directory with the given name.
createDirectory :: FilePath -> IO ()
createDirectory dir = prim_createDirectory $## dir
prim_createDirectory :: FilePath -> IO ()
prim_createDirectory external
--- Creates a new directory with the given name if it does not already exist.
--- If the first parameter is `True` it will also create all missing
--- parent directories.
createDirectoryIfMissing :: Bool -> FilePath -> IO ()
createDirectoryIfMissing createParents path
= if createParents then createDirs parents
else createDirs [last parents]
where
parents = scanl1 (</>) $ splitDirectories $ path
createDirs [] = done
createDirs (d:ds) = do
exists <- doesDirectoryExist d
if exists then done else createDirectory d
createDirs ds
--- Deletes a directory from the file system.
removeDirectory :: FilePath -> IO ()
removeDirectory dir = prim_removeDirectory $## dir
prim_removeDirectory :: FilePath -> IO ()
prim_removeDirectory external
--- Renames a directory.
renameDirectory :: FilePath -> FilePath -> IO ()
renameDirectory dir1 dir2 = (prim_renameDirectory $## dir1) $## dir2
prim_renameDirectory :: FilePath -> FilePath -> IO ()
prim_renameDirectory external
--- Returns the home directory of the current user.
getHomeDirectory :: IO FilePath
getHomeDirectory = if isWindows
then getEnviron "USERPROFILE"
else getEnviron "HOME"
--- Returns the temporary directory of the operating system.
getTemporaryDirectory :: IO FilePath
getTemporaryDirectory = if isWindows then getEnviron "TMP" else return "/tmp"
--- Convert a path name into an absolute one.
--- For instance, a leading `~` is replaced by the current home directory.
getAbsolutePath :: FilePath -> IO FilePath
getAbsolutePath path
| isAbsolute path = return (normalise path)
| path == "~" = getHomeDirectory
| "~/" `isPrefixOf` path = do homedir <- getHomeDirectory
return (normalise (homedir </> drop 2 path))
| otherwise = do curdir <- getCurrentDirectory
return (normalise (curdir </> path))
--- Deletes a file from the file system.
removeFile :: FilePath -> IO ()
removeFile file = prim_removeFile $## file
prim_removeFile :: FilePath -> IO ()
prim_removeFile external
--- Renames a file.
renameFile :: FilePath -> FilePath -> IO ()
renameFile file1 file2 = (prim_renameFile $## file1) $## file2
prim_renameFile :: FilePath -> FilePath -> IO ()
prim_renameFile external
--- Copy the contents from one file to another file
copyFile :: FilePath -> FilePath -> IO ()
copyFile src dest = readFile src >>= writeFile dest
|
