Haskell: Exploring System.Directory package

In this post and subsequent posts, I am going to explain about System.Directory package.  System.Directory provides number of system independent functions for directory manipulation. Following table summarizes all the functions in System.Directory package.

Function	Signature	Description
createDirectory	createDirectory :: FilePath -> IO ()	Create a directory
createDirectoryIfMissing	createDirectoryIfMissing :: Bool -> FilePath -> IO ()	Create directory if not exist
removeDirectory	removeDirectory :: FilePath -> IO ()	Remove an existing directory
removeDirectoryRecursive	removeDirectoryRecursive :: FilePath -> IO ()	Remove directories and sub directories
renameDirectory	renameDirectory :: FilePath -> FilePath -> IO ()	Rename a directory
getDirectoryContents	getDirectoryContents :: FilePath -> IO [FilePath]	List all entries in the directory including special entries ., ..
getCurrentDirectory	getCurrentDirectory :: IO FilePath	Get current working directory.
setCurrentDirectory:	setCurrentDirectory :: FilePath -> IO ()	Change working directory
getHomeDirectory	getHomeDirectory :: IO FilePath	Get user home directory
listDirectory	listDirectory :: FilePath -> IO [FilePath]	List all entries in the directory.
withCurrentDirectory	withCurrentDirectory :: FilePath -> IO a -> IO a	Run IO action with given directory
getTemporaryDirectory	getTemporaryDirectory :: IO FilePath	Get the directory for temporary files
removeFile	removeFile :: FilePath -> IO ()	Remove file
renameFile	renameFile :: FilePath -> FilePath -> IO ()	Rename file
copyFile	copyFile :: FilePath -> FilePath -> IO ()	Copy file
canonicalizePath	canonicalizePath :: FilePath -> IO FilePath	Replace ., .. with actual path
makeAbsolute	makeAbsolute :: FilePath -> IO FilePath	Convert path to absolute path
makeRelativeToCurrentDirectory	makeRelativeToCurrentDirectory :: FilePath -> IO FilePath	Construct a path relative to current directory
findExecutable	findExecutable :: String -> IO (Maybe FilePath)	Get the path of given executable
findExecutables	findExecutables :: String -> IO [FilePath]	Get all the paths of executable file
findExecutablesInDirectories	findExecutablesInDirectories:: [FilePath] -> String -> IO [FilePath]	Search for an executable in given directories
findFile	findFile :: [FilePath] -> String -> IO (Maybe FilePath)	Search for a file in given directories
findFiles	findFiles :: [FilePath] -> String -> IO [FilePath]	Search for a file in given directories
findFilesWith	findFilesWith:: (FilePath -> IO Bool) -> [FilePath] -> String -> IO [FilePath]	Get all the files that satisfiy given property
emptyPermissions	emptyPermissions :: Permissions	Return Permissions instance by clearing all. Prelude System.Directory> emptyPermissions Permissions {readable = False, writable = False, executable = False, searchable = False}
readable	readable :: Permissions -> Bool	Return True, if the Permissions instance has the property readable = True, else False.
writable	writable :: Permissions -> Bool	Return True, if the Permissions instance has the property writable = True, else False.
executable	executable :: Permissions -> Bool	Return True, if the Permissions instance has the property executable = True, else False.
searchable	searchable :: Permissions -> Bool	Return True, if the Permissions instance has the property searchable = True, else False
setOwnerReadable	setOwnerReadable :: Bool -> Permissions -> Permissions	If the Bool argument is True, it sets the readable permission to the owner, else unset.
setOwnerWritable	setOwnerWritable :: Bool -> Permissions -> Permissions	If the Bool argument is True, it sets the writable permission to the owner, else unset.
setOwnerExecutable	setOwnerExecutable :: Bool -> Permissions -> Permissions	If the Bool argument is True, it sets the executable permission to the owner, else unset.
setOwnerSearchable	setOwnerSearchable :: Bool -> Permissions -> Permissions	If the Bool argument is True, it sets the searchable permission to the owner, else unset.
getPermissions	getPermissions :: FilePath -> IO Permissions	Get the permissions of a file (or) directory.
setPermissions	setPermissions :: FilePath -> Permissions -> IO ()	Set permissins to given file.
copyPermissions	copyPermissions :: FilePath -> FilePath -> IO ()	Copy permissions of one file to other.
getAccessTime	FilePath -> IO UTCTime	Get the time at which the file or directory was last accessed.
getModificationTime	FilePath -> IO UTCTime	Get the time at which the file or directory was last modified.
setAccessTime	FilePath -> UTCTime -> IO () Source	Change the time at which the file or directory was last accessed.
setModificationTime	FilePath -> UTCTime -> IO ()	Change the time at which the file or directory was last modified.

Following functions are used to check file/directory existence.

doesFileExist: Check for file existance

doesDirectoryExist: Check for directory existence

Following function is used to get the extension of executable file.

exeExtension: Get the extension of executable file.

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