Safe Haskell	None
Language	Haskell2010

Development.Shake.FilePath

Description

A module for FilePath operations exposing System.FilePath plus some additional operations.

Windows note: The extension methods (<.>, takeExtension etc) use the Posix variants since on Windows "//*" <.> "txt" produces "//*\\.txt" (which is bad for FilePattern values).

Synopsis

(-<.>) :: FilePath -> String -> FilePath
(</>) :: FilePath -> FilePath -> FilePath
addTrailingPathSeparator :: FilePath -> FilePath
combine :: FilePath -> FilePath -> FilePath
dropDrive :: FilePath -> FilePath
dropFileName :: FilePath -> FilePath
dropTrailingPathSeparator :: FilePath -> FilePath
equalFilePath :: FilePath -> FilePath -> Bool
extSeparator :: Char
getSearchPath :: IO [FilePath]
hasDrive :: FilePath -> Bool
hasTrailingPathSeparator :: FilePath -> Bool
isAbsolute :: FilePath -> Bool
isDrive :: FilePath -> Bool
isExtSeparator :: Char -> Bool
isExtensionOf :: String -> FilePath -> Bool
isPathSeparator :: Char -> Bool
isRelative :: FilePath -> Bool
isSearchPathSeparator :: Char -> Bool
isValid :: FilePath -> Bool
joinDrive :: FilePath -> FilePath -> FilePath
joinPath :: [FilePath] -> FilePath
makeRelative :: FilePath -> FilePath -> FilePath
makeValid :: FilePath -> FilePath
normalise :: FilePath -> FilePath
pathSeparator :: Char
pathSeparators :: [Char]
replaceBaseName :: FilePath -> String -> FilePath
replaceDirectory :: FilePath -> String -> FilePath
replaceExtensions :: FilePath -> String -> FilePath
replaceFileName :: FilePath -> String -> FilePath
searchPathSeparator :: Char
splitDirectories :: FilePath -> [FilePath]
splitDrive :: FilePath -> (FilePath, FilePath)
splitFileName :: FilePath -> (String, String)
splitPath :: FilePath -> [FilePath]
splitSearchPath :: String -> [FilePath]
stripExtension :: String -> FilePath -> Maybe FilePath
takeBaseName :: FilePath -> String
takeDirectory :: FilePath -> FilePath
takeDrive :: FilePath -> FilePath
takeFileName :: FilePath -> FilePath
type FilePath = String
(<.>) :: FilePath -> String -> FilePath
addExtension :: FilePath -> String -> FilePath
dropExtension :: FilePath -> FilePath
dropExtensions :: FilePath -> FilePath
hasExtension :: FilePath -> Bool
replaceExtension :: FilePath -> String -> FilePath
splitExtension :: FilePath -> (String, String)
splitExtensions :: FilePath -> (FilePath, String)
takeExtension :: FilePath -> String
takeExtensions :: FilePath -> String
dropDirectory1 :: FilePath -> FilePath
takeDirectory1 :: FilePath -> FilePath
replaceDirectory1 :: FilePath -> String -> FilePath
makeRelativeEx :: FilePath -> FilePath -> IO (Maybe FilePath)
normaliseEx :: FilePath -> FilePath
toNative :: FilePath -> FilePath
toStandard :: FilePath -> FilePath
exe :: String

Documentation

(-<.>) :: FilePath -> String -> FilePath infixr 7 #

Remove the current extension and add another, equivalent to replaceExtension.

"/directory/path.txt" -<.> "ext" == "/directory/path.ext"
"/directory/path.txt" -<.> ".ext" == "/directory/path.ext"
"foo.o" -<.> "c" == "foo.c"

(</>) :: FilePath -> FilePath -> FilePath infixr 5 #

Combine two paths with a path separator. If the second path starts with a path separator or a drive letter, then it returns the second. The intention is that readFile (dir </> file) will access the same file as setCurrentDirectory dir; readFile file.

Posix:   "/directory" </> "file.ext" == "/directory/file.ext"
Windows: "/directory" </> "file.ext" == "/directory\\file.ext"
         "directory" </> "/file.ext" == "/file.ext"
Valid x => (takeDirectory x </> takeFileName x) `equalFilePath` x

Combined:

Posix:   "/" </> "test" == "/test"
Posix:   "home" </> "bob" == "home/bob"
Posix:   "x:" </> "foo" == "x:/foo"
Windows: "C:\\foo" </> "bar" == "C:\\foo\\bar"
Windows: "home" </> "bob" == "home\\bob"

Not combined:

Posix:   "home" </> "/bob" == "/bob"
Windows: "home" </> "C:\\bob" == "C:\\bob"

Not combined (tricky):

On Windows, if a filepath starts with a single slash, it is relative to the root of the current drive. In [1], this is (confusingly) referred to as an absolute path. The current behavior of </> is to never combine these forms.

Windows: "home" </> "/bob" == "/bob"
Windows: "home" </> "\\bob" == "\\bob"
Windows: "C:\\home" </> "\\bob" == "\\bob"

On Windows, from [1]: "If a file name begins with only a disk designator but not the backslash after the colon, it is interpreted as a relative path to the current directory on the drive with the specified letter." The current behavior of </> is to never combine these forms.

Windows: "D:\\foo" </> "C:bar" == "C:bar"
Windows: "C:\\foo" </> "C:bar" == "C:bar"

addTrailingPathSeparator :: FilePath -> FilePath #

Add a trailing file path separator if one is not already present.

hasTrailingPathSeparator (addTrailingPathSeparator x)
hasTrailingPathSeparator x ==> addTrailingPathSeparator x == x
Posix:    addTrailingPathSeparator "test/rest" == "test/rest/"

combine :: FilePath -> FilePath -> FilePath #

An alias for </>.

dropDrive :: FilePath -> FilePath #

Delete the drive, if it exists.

dropDrive x == snd (splitDrive x)

dropFileName :: FilePath -> FilePath #

Drop the filename. Unlike takeDirectory, this function will leave a trailing path separator on the directory.

dropFileName "/directory/file.ext" == "/directory/"
dropFileName x == fst (splitFileName x)
isPrefixOf (takeDrive x) (dropFileName x)

dropTrailingPathSeparator :: FilePath -> FilePath #

Remove any trailing path separators

dropTrailingPathSeparator "file/test/" == "file/test"
          dropTrailingPathSeparator "/" == "/"
Windows:  dropTrailingPathSeparator "\\" == "\\"
Posix:    not (hasTrailingPathSeparator (dropTrailingPathSeparator x)) || isDrive x

equalFilePath :: FilePath -> FilePath -> Bool #

Equality of two FILEPATHs. If you call System.Directory.canonicalizePath first this has a much better chance of working. Note that this doesn't follow symlinks or DOSNAM~1s.

Similar to normalise, this does not expand "..", because of symlinks.

         x == y ==> equalFilePath x y
         normalise x == normalise y ==> equalFilePath x y
         equalFilePath "foo" "foo/"
         not (equalFilePath "/a/../c" "/c")
         not (equalFilePath "foo" "/foo")
Posix:   not (equalFilePath "foo" "FOO")
Windows: equalFilePath "foo" "FOO"
Windows: not (equalFilePath "C:" "C:/")

extSeparator :: Char #

File extension character

extSeparator == '.'

getSearchPath :: IO [FilePath] #

Get a list of FILEPATHs in the $PATH variable.

hasDrive :: FilePath -> Bool #

Does a path have a drive.

not (hasDrive x) == null (takeDrive x)
Posix:   hasDrive "/foo" == True
Windows: hasDrive "C:\\foo" == True
Windows: hasDrive "C:foo" == True
         hasDrive "foo" == False
         hasDrive "" == False

hasTrailingPathSeparator :: FilePath -> Bool #

Is an item either a directory or the last character a path separator?

hasTrailingPathSeparator "test" == False
hasTrailingPathSeparator "test/" == True

isAbsolute :: FilePath -> Bool #

not . isRelative

isAbsolute x == not (isRelative x)

isDrive :: FilePath -> Bool #

Is an element a drive

Posix:   isDrive "/" == True
Posix:   isDrive "/foo" == False
Windows: isDrive "C:\\" == True
Windows: isDrive "C:\\foo" == False
         isDrive "" == False

isExtSeparator :: Char -> Bool #

Is the character an extension character?

isExtSeparator a == (a == extSeparator)

isExtensionOf :: String -> FilePath -> Bool #

Does the given filename have the specified extension?

"png" `isExtensionOf` "/directory/file.png" == True
".png" `isExtensionOf` "/directory/file.png" == True
".tar.gz" `isExtensionOf` "bar/foo.tar.gz" == True
"ar.gz" `isExtensionOf` "bar/foo.tar.gz" == False
"png" `isExtensionOf` "/directory/file.png.jpg" == False
"csv/table.csv" `isExtensionOf` "/data/csv/table.csv" == False

isPathSeparator :: Char -> Bool #

Rather than using (== pathSeparator), use this. Test if something is a path separator.

isPathSeparator a == (a `elem` pathSeparators)

isRelative :: FilePath -> Bool #

Is a path relative, or is it fixed to the root?

Windows: isRelative "path\\test" == True
Windows: isRelative "c:\\test" == False
Windows: isRelative "c:test" == True
Windows: isRelative "c:\\" == False
Windows: isRelative "c:/" == False
Windows: isRelative "c:" == True
Windows: isRelative "\\\\foo" == False
Windows: isRelative "\\\\?\\foo" == False
Windows: isRelative "\\\\?\\UNC\\foo" == False
Windows: isRelative "/foo" == True
Windows: isRelative "\\foo" == True
Posix:   isRelative "test/path" == True
Posix:   isRelative "/test" == False
Posix:   isRelative "/" == False

According to [1]:

"A UNC name of any format [is never relative]."
"You cannot use the "\?" prefix with a relative path."

isSearchPathSeparator :: Char -> Bool #

Is the character a file separator?

isSearchPathSeparator a == (a == searchPathSeparator)

isValid :: FilePath -> Bool #

Is a FilePath valid, i.e. could you create a file like it? This function checks for invalid names, and invalid characters, but does not check if length limits are exceeded, as these are typically filesystem dependent.

         isValid "" == False
         isValid "\0" == False
Posix:   isValid "/random_ path:*" == True
Posix:   isValid x == not (null x)
Windows: isValid "c:\\test" == True
Windows: isValid "c:\\test:of_test" == False
Windows: isValid "test*" == False
Windows: isValid "c:\\test\\nul" == False
Windows: isValid "c:\\test\\prn.txt" == False
Windows: isValid "c:\\nul\\file" == False
Windows: isValid "\\\\" == False
Windows: isValid "\\\\\\foo" == False
Windows: isValid "\\\\?\\D:file" == False
Windows: isValid "foo\tbar" == False
Windows: isValid "nul .txt" == False
Windows: isValid " nul.txt" == True

joinDrive :: FilePath -> FilePath -> FilePath #

Join a drive and the rest of the path.

Valid x => uncurry joinDrive (splitDrive x) == x
Windows: joinDrive "C:" "foo" == "C:foo"
Windows: joinDrive "C:\\" "bar" == "C:\\bar"
Windows: joinDrive "\\\\share" "foo" == "\\\\share\\foo"
Windows: joinDrive "/:" "foo" == "/:\\foo"

joinPath :: [FilePath] -> FilePath #

Join path elements back together.

joinPath z == foldr (</>) "" z
joinPath ["/","directory/","file.ext"] == "/directory/file.ext"
Valid x => joinPath (splitPath x) == x
joinPath [] == ""
Posix: joinPath ["test","file","path"] == "test/file/path"

makeRelative :: FilePath -> FilePath -> FilePath #

Contract a filename, based on a relative path. Note that the resulting path will never introduce .. paths, as the presence of symlinks means ../b may not reach a/b if it starts from a/c. For a worked example see this blog post.

The corresponding makeAbsolute function can be found in System.Directory.

         makeRelative "/directory" "/directory/file.ext" == "file.ext"
         Valid x => makeRelative (takeDirectory x) x `equalFilePath` takeFileName x
         makeRelative x x == "."
         Valid x y => equalFilePath x y || (isRelative x && makeRelative y x == x) || equalFilePath (y </> makeRelative y x) x
Windows: makeRelative "C:\\Home" "c:\\home\\bob" == "bob"
Windows: makeRelative "C:\\Home" "c:/home/bob" == "bob"
Windows: makeRelative "C:\\Home" "D:\\Home\\Bob" == "D:\\Home\\Bob"
Windows: makeRelative "C:\\Home" "C:Home\\Bob" == "C:Home\\Bob"
Windows: makeRelative "/Home" "/home/bob" == "bob"
Windows: makeRelative "/" "//" == "//"
Posix:   makeRelative "/Home" "/home/bob" == "/home/bob"
Posix:   makeRelative "/home/" "/home/bob/foo/bar" == "bob/foo/bar"
Posix:   makeRelative "/fred" "bob" == "bob"
Posix:   makeRelative "/file/test" "/file/test/fred" == "fred"
Posix:   makeRelative "/file/test" "/file/test/fred/" == "fred/"
Posix:   makeRelative "some/path" "some/path/a/b/c" == "a/b/c"

makeValid :: FilePath -> FilePath #

Take a FilePath and make it valid; does not change already valid FILEPATHs.

isValid (makeValid x)
isValid x ==> makeValid x == x
makeValid "" == "_"
makeValid "file\0name" == "file_name"
Windows: makeValid "c:\\already\\/valid" == "c:\\already\\/valid"
Windows: makeValid "c:\\test:of_test" == "c:\\test_of_test"
Windows: makeValid "test*" == "test_"
Windows: makeValid "c:\\test\\nul" == "c:\\test\\nul_"
Windows: makeValid "c:\\test\\prn.txt" == "c:\\test\\prn_.txt"
Windows: makeValid "c:\\test/prn.txt" == "c:\\test/prn_.txt"
Windows: makeValid "c:\\nul\\file" == "c:\\nul_\\file"
Windows: makeValid "\\\\\\foo" == "\\\\drive"
Windows: makeValid "\\\\?\\D:file" == "\\\\?\\D:\\file"
Windows: makeValid "nul .txt" == "nul _.txt"

normalise :: FilePath -> FilePath #

Normalise a file

// outside of the drive can be made blank
/ -> pathSeparator
./ -> ""

Does not remove "..", because of symlinks.

Posix:   normalise "/file/\\test////" == "/file/\\test/"
Posix:   normalise "/file/./test" == "/file/test"
Posix:   normalise "/test/file/../bob/fred/" == "/test/file/../bob/fred/"
Posix:   normalise "../bob/fred/" == "../bob/fred/"
Posix:   normalise "/a/../c" == "/a/../c"
Posix:   normalise "./bob/fred/" == "bob/fred/"
Windows: normalise "c:\\file/bob\\" == "C:\\file\\bob\\"
Windows: normalise "c:\\" == "C:\\"
Windows: normalise "c:\\\\\\\\" == "C:\\"
Windows: normalise "C:.\\" == "C:"
Windows: normalise "\\\\server\\test" == "\\\\server\\test"
Windows: normalise "//server/test" == "\\\\server\\test"
Windows: normalise "c:/file" == "C:\\file"
Windows: normalise "/file" == "\\file"
Windows: normalise "\\" == "\\"
Windows: normalise "/./" == "\\"
         normalise "." == "."
Posix:   normalise "./" == "./"
Posix:   normalise "./." == "./"
Posix:   normalise "/./" == "/"
Posix:   normalise "/" == "/"
Posix:   normalise "bob/fred/." == "bob/fred/"
Posix:   normalise "//home" == "/home"

pathSeparator :: Char #

The character that separates directories. In the case where more than one character is possible, pathSeparator is the 'ideal' one.

Windows: pathSeparator == '\\'
Posix:   pathSeparator ==  '/'
isPathSeparator pathSeparator

pathSeparators :: [Char] #

The list of all possible separators.

Windows: pathSeparators == ['\\', '/']
Posix:   pathSeparators == ['/']
pathSeparator `elem` pathSeparators

replaceBaseName :: FilePath -> String -> FilePath #

Set the base name.

replaceBaseName "/directory/other.ext" "file" == "/directory/file.ext"
replaceBaseName "file/test.txt" "bob" == "file/bob.txt"
replaceBaseName "fred" "bill" == "bill"
replaceBaseName "/dave/fred/bob.gz.tar" "new" == "/dave/fred/new.tar"
Valid x => replaceBaseName x (takeBaseName x) == x

replaceDirectory :: FilePath -> String -> FilePath #

Set the directory, keeping the filename the same.

replaceDirectory "root/file.ext" "/directory/" == "/directory/file.ext"
Valid x => replaceDirectory x (takeDirectory x) `equalFilePath` x

replaceExtensions :: FilePath -> String -> FilePath #

Replace all extensions of a file with a new extension. Note that replaceExtension and addExtension both work for adding multiple extensions, so only required when you need to drop all extensions first.

replaceExtensions "file.fred.bob" "txt" == "file.txt"
replaceExtensions "file.fred.bob" "tar.gz" == "file.tar.gz"

replaceFileName :: FilePath -> String -> FilePath #

Set the filename.

replaceFileName "/directory/other.txt" "file.ext" == "/directory/file.ext"
Valid x => replaceFileName x (takeFileName x) == x

searchPathSeparator :: Char #

The character that is used to separate the entries in the $PATH environment variable.

Windows: searchPathSeparator == ';'
Posix:   searchPathSeparator == ':'

splitDirectories :: FilePath -> [FilePath] #

Just as splitPath, but don't add the trailing slashes to each element.

         splitDirectories "/directory/file.ext" == ["/","directory","file.ext"]
         splitDirectories "test/file" == ["test","file"]
         splitDirectories "/test/file" == ["/","test","file"]
Windows: splitDirectories "C:\\test\\file" == ["C:\\", "test", "file"]
         Valid x => joinPath (splitDirectories x) `equalFilePath` x
         splitDirectories "" == []
Windows: splitDirectories "C:\\test\\\\\\file" == ["C:\\", "test", "file"]
         splitDirectories "/test///file" == ["/","test","file"]

splitDrive :: FilePath -> (FilePath, FilePath) #

Split a path into a drive and a path. On Posix, / is a Drive.

uncurry (<>) (splitDrive x) == x
Windows: splitDrive "file" == ("","file")
Windows: splitDrive "c:/file" == ("c:/","file")
Windows: splitDrive "c:\\file" == ("c:\\","file")
Windows: splitDrive "\\\\shared\\test" == ("\\\\shared\\","test")
Windows: splitDrive "\\\\shared" == ("\\\\shared","")
Windows: splitDrive "\\\\?\\UNC\\shared\\file" == ("\\\\?\\UNC\\shared\\","file")
Windows: splitDrive "\\\\?\\UNCshared\\file" == ("\\\\?\\","UNCshared\\file")
Windows: splitDrive "\\\\?\\d:\\file" == ("\\\\?\\d:\\","file")
Windows: splitDrive "/d" == ("","/d")
Posix:   splitDrive "/test" == ("/","test")
Posix:   splitDrive "//test" == ("//","test")
Posix:   splitDrive "test/file" == ("","test/file")
Posix:   splitDrive "file" == ("","file")

splitFileName :: FilePath -> (String, String) #

Split a filename into directory and file. </> is the inverse. The first component will often end with a trailing slash.

splitFileName "/directory/file.ext" == ("/directory/","file.ext")
Valid x => uncurry (</>) (splitFileName x) == x || fst (splitFileName x) == "./"
Valid x => isValid (fst (splitFileName x))
splitFileName "file/bob.txt" == ("file/", "bob.txt")
splitFileName "file/" == ("file/", "")
splitFileName "bob" == ("./", "bob")
Posix:   splitFileName "/" == ("/","")
Windows: splitFileName "c:" == ("c:","")
Windows: splitFileName "\\\\?\\A:\\fred" == ("\\\\?\\A:\\","fred")
Windows: splitFileName "\\\\?\\A:" == ("\\\\?\\A:","")

splitPath :: FilePath -> [FilePath] #

Split a path by the directory separator.

splitPath "/directory/file.ext" == ["/","directory/","file.ext"]
concat (splitPath x) == x
splitPath "test//item/" == ["test//","item/"]
splitPath "test/item/file" == ["test/","item/","file"]
splitPath "" == []
Windows: splitPath "c:\\test\\path" == ["c:\\","test\\","path"]
Posix:   splitPath "/file/test" == ["/","file/","test"]

splitSearchPath :: String -> [FilePath] #

Take a string, split it on the searchPathSeparator character. Blank items are ignored on Windows, and converted to . on Posix. On Windows path elements are stripped of quotes.

Follows the recommendations in http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html

Posix:   splitSearchPath "File1:File2:File3"  == ["File1","File2","File3"]
Posix:   splitSearchPath "File1::File2:File3" == ["File1",".","File2","File3"]
Windows: splitSearchPath "File1;File2;File3"  == ["File1","File2","File3"]
Windows: splitSearchPath "File1;;File2;File3" == ["File1","File2","File3"]
Windows: splitSearchPath "File1;\"File2\";File3" == ["File1","File2","File3"]

stripExtension :: String -> FilePath -> Maybe FilePath #

Drop the given extension from a FilePath, and the "." preceding it. Returns Nothing if the FilePath does not have the given extension, or Just and the part before the extension if it does.

This function can be more predictable than dropExtensions, especially if the filename might itself contain . characters.

stripExtension "hs.o" "foo.x.hs.o" == Just "foo.x"
stripExtension "hi.o" "foo.x.hs.o" == Nothing
dropExtension x == fromJust (stripExtension (takeExtension x) x)
dropExtensions x == fromJust (stripExtension (takeExtensions x) x)
stripExtension ".c.d" "a.b.c.d"  == Just "a.b"
stripExtension ".c.d" "a.b..c.d" == Just "a.b."
stripExtension "baz"  "foo.bar"  == Nothing
stripExtension "bar"  "foobar"   == Nothing
stripExtension ""     x          == Just x

takeBaseName :: FilePath -> String #

Get the base name, without an extension or path.

takeBaseName "/directory/file.ext" == "file"
takeBaseName "file/test.txt" == "test"
takeBaseName "dave.ext" == "dave"
takeBaseName "" == ""
takeBaseName "test" == "test"
takeBaseName (addTrailingPathSeparator x) == ""
takeBaseName "file/file.tar.gz" == "file.tar"

takeDirectory :: FilePath -> FilePath #

Get the directory name, move up one level.

          takeDirectory "/directory/other.ext" == "/directory"
          isPrefixOf (takeDirectory x) x || takeDirectory x == "."
          takeDirectory "foo" == "."
          takeDirectory "/" == "/"
          takeDirectory "/foo" == "/"
          takeDirectory "/foo/bar/baz" == "/foo/bar"
          takeDirectory "/foo/bar/baz/" == "/foo/bar/baz"
          takeDirectory "foo/bar/baz" == "foo/bar"
Windows:  takeDirectory "foo\\bar" == "foo"
Windows:  takeDirectory "foo\\bar\\\\" == "foo\\bar"
Windows:  takeDirectory "C:\\" == "C:\\"

takeDrive :: FilePath -> FilePath #

Get the drive from a filepath.

takeDrive x == fst (splitDrive x)

takeFileName :: FilePath -> FilePath #

Get the file name.

takeFileName "/directory/file.ext" == "file.ext"
takeFileName "test/" == ""
isSuffixOf (takeFileName x) x
takeFileName x == snd (splitFileName x)
Valid x => takeFileName (replaceFileName x "fred") == "fred"
Valid x => takeFileName (x </> "fred") == "fred"
Valid x => isRelative (takeFileName x)

type FilePath = String #

File and directory names are values of type String, whose precise meaning is operating system dependent. Files can be opened, yielding a handle which can then be used to operate on the contents of that file.

(<.>) :: FilePath -> String -> FilePath infixr 7 #

Add an extension, even if there is already one there, equivalent to addExtension.

"/directory/path" <.> "ext" == "/directory/path.ext"
"/directory/path" <.> ".ext" == "/directory/path.ext"

addExtension :: FilePath -> String -> FilePath #

Add an extension, even if there is already one there, equivalent to <.>.

addExtension "/directory/path" "ext" == "/directory/path.ext"
addExtension "file.txt" "bib" == "file.txt.bib"
addExtension "file." ".bib" == "file..bib"
addExtension "file" ".bib" == "file.bib"
addExtension "/" "x" == "/.x"
addExtension x "" == x
Valid x => takeFileName (addExtension (addTrailingPathSeparator x) "ext") == ".ext"
Windows: addExtension "\\\\share" ".txt" == "\\\\share\\.txt"

dropExtension :: FilePath -> FilePath #

Remove last extension, and the "." preceding it.

dropExtension "/directory/path.ext" == "/directory/path"
dropExtension x == fst (splitExtension x)

dropExtensions :: FilePath -> FilePath #

Drop all extensions.

dropExtensions "/directory/path.ext" == "/directory/path"
dropExtensions "file.tar.gz" == "file"
not $ hasExtension $ dropExtensions x
not $ any isExtSeparator $ takeFileName $ dropExtensions x

hasExtension :: FilePath -> Bool #

Does the given filename have an extension?

hasExtension "/directory/path.ext" == True
hasExtension "/directory/path" == False
null (takeExtension x) == not (hasExtension x)

replaceExtension :: FilePath -> String -> FilePath #

Set the extension of a file, overwriting one if already present, equivalent to -<.>.

replaceExtension "/directory/path.txt" "ext" == "/directory/path.ext"
replaceExtension "/directory/path.txt" ".ext" == "/directory/path.ext"
replaceExtension "file.txt" ".bob" == "file.bob"
replaceExtension "file.txt" "bob" == "file.bob"
replaceExtension "file" ".bob" == "file.bob"
replaceExtension "file.txt" "" == "file"
replaceExtension "file.fred.bob" "txt" == "file.fred.txt"
replaceExtension x y == addExtension (dropExtension x) y

splitExtension :: FilePath -> (String, String) #

Split on the extension. addExtension is the inverse.

splitExtension "/directory/path.ext" == ("/directory/path",".ext")
uncurry (<>) (splitExtension x) == x
Valid x => uncurry addExtension (splitExtension x) == x
splitExtension "file.txt" == ("file",".txt")
splitExtension "file" == ("file","")
splitExtension "file/file.txt" == ("file/file",".txt")
splitExtension "file.txt/boris" == ("file.txt/boris","")
splitExtension "file.txt/boris.ext" == ("file.txt/boris",".ext")
splitExtension "file/path.txt.bob.fred" == ("file/path.txt.bob",".fred")
splitExtension "file/path.txt/" == ("file/path.txt/","")

splitExtensions :: FilePath -> (FilePath, String) #

Split on all extensions.

splitExtensions "/directory/path.ext" == ("/directory/path",".ext")
splitExtensions "file.tar.gz" == ("file",".tar.gz")
uncurry (<>) (splitExtensions x) == x
Valid x => uncurry addExtension (splitExtensions x) == x

takeExtension :: FilePath -> String #

Get the extension of a file, returns "" for no extension, .ext otherwise.

takeExtension "/directory/path.ext" == ".ext"
takeExtension x == snd (splitExtension x)
Valid x => takeExtension (addExtension x "ext") == ".ext"
Valid x => takeExtension (replaceExtension x "ext") == ".ext"

takeExtensions :: FilePath -> String #

Get all extensions.

takeExtensions "/directory/path.ext" == ".ext"
takeExtensions "file.tar.gz" == ".tar.gz"

dropDirectory1 :: FilePath -> FilePath Source #

Drop the first directory from a FilePath. Should only be used on relative paths.

dropDirectory1 "aaa/bbb" == "bbb"
dropDirectory1 "aaa/" == ""
dropDirectory1 "aaa" == ""
dropDirectory1 "" == ""

takeDirectory1 :: FilePath -> FilePath Source #

Take the first component of a FilePath. Should only be used on relative paths.

takeDirectory1 "aaa/bbb" == "aaa"
takeDirectory1 "aaa/" == "aaa"
takeDirectory1 "aaa" == "aaa"

replaceDirectory1 :: FilePath -> String -> FilePath Source #

Replace the first component of a FilePath. Should only be used on relative paths.

replaceDirectory1 "root/file.ext" "directory" == "directory/file.ext"
replaceDirectory1 "root/foo/bar/file.ext" "directory" == "directory/foo/bar/file.ext"

makeRelativeEx :: FilePath -> FilePath -> IO (Maybe FilePath) Source #

Make a path relative. Returns Nothing only when the given paths are on different drives. This will try the pure function makeRelative first. If that fails, the paths are canonicalised (removing any indirection and symlinks) and a relative path is derived from there.

> -- Given that "/root/a/" is not a symlink
> makeRelativeEx "/root/a/" "/root/b/file.out"
Just "../b/file.out"

> -- Given that "/root/c/" is a symlink to "/root/e/f/g/"
> makeRelativeEx "/root/c/" "/root/b/file.out"
Just "../../../b/file.out"

> -- On Windows
> makeRelativeEx "C:\\foo" "D:\\foo\\bar"
Nothing

normaliseEx :: FilePath -> FilePath Source #

Normalise a FilePath, applying the rules:

All pathSeparators become pathSeparator (/ on Linux, \ on Windows)
foo/bar/../baz becomes foo/baz (not universally true in the presence of symlinks)
foo/./bar becomes foo/bar
foo//bar becomes foo/bar

This function is not based on the normalise function from the filepath library, as that function is quite broken.

toNative :: FilePath -> FilePath Source #

Convert to native path separators, namely \ on Windows.

toStandard :: FilePath -> FilePath Source #

Convert all path separators to /, even on Windows.

exe :: String Source #

The extension of executables, "exe" on Windows and "" otherwise.