Safe Haskell | None |
---|---|
Language | GHC2021 |
Synopsis
- type OsPath = OsString
- data OsString
- encodeUtf :: MonadThrow m => FilePath -> m OsPath
- decodeUtf :: MonadThrow m => OsPath -> m FilePath
- unsafeDecodeUtf :: HasCallStack => OsPath -> FilePath
- unsafeEncodeUtf :: HasCallStack => String -> OsString
- os :: String -> OsString
- (</>) :: OsPath -> OsPath -> OsPath
- (<.>) :: OsPath -> OsString -> OsPath
OsPath initialisation and transformation
type OsPath = OsString Source #
Type representing filenames/pathnames.
This type doesn't add any guarantees over OsString
.
Newtype representing short operating system specific strings.
Internally this is either WindowsString
or PosixString
,
depending on the platform. Both use unpinned
ShortByteString
for efficiency.
The constructor is only exported via System.OsString.Internal.Types, since dealing with the internals isn't generally recommended, but supported in case you need to write platform specific code.
Instances
NFData OsString Source # | |||||
Defined in System.OsString.Internal.Types | |||||
Monoid OsString Source # | "String-Concatenation" for | ||||
Semigroup OsString Source # | |||||
Generic OsString Source # | |||||
Defined in System.OsString.Internal.Types
| |||||
Show OsString Source # | On windows, decodes as UCS-2. On unix prints the raw bytes without decoding. | ||||
Eq OsString Source # | Byte equality of the internal representation. | ||||
Ord OsString Source # | Byte ordering of the internal representation. | ||||
Defined in System.OsString.Internal.Types | |||||
Lift OsString | |||||
type Rep OsString Source # | |||||
Defined in System.OsString.Internal.Types type Rep OsString = D1 ('MetaData "OsString" "System.OsString.Internal.Types" "os-string-2.0.7-d090" 'True) (C1 ('MetaCons "OsString" 'PrefixI 'True) (S1 ('MetaSel ('Just "getOsString") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 PlatformString))) |
encodeUtf :: MonadThrow m => FilePath -> m OsPath Source #
Partial unicode friendly encoding.
On windows this encodes as UTF16-LE (strictly), which is a pretty good guess. On unix this encodes as UTF8 (strictly), which is a good guess.
Throws an EncodingException
if encoding fails. If the input does not
contain surrogate chars, you can use unsafeEncodeUtf
.
decodeUtf :: MonadThrow m => OsPath -> m FilePath Source #
Partial unicode friendly decoding.
On windows this decodes as UTF16-LE (strictly), which is a pretty good guess. On unix this decodes as UTF8 (strictly), which is a good guess.
Throws a EncodingException
if decoding fails.
unsafeDecodeUtf :: HasCallStack => OsPath -> FilePath Source #
unsafeEncodeUtf :: HasCallStack => String -> OsString Source #
Unsafe unicode friendly encoding.
Like encodeUtf
, except it crashes when the input contains
surrogate chars. For sanitized input, this can be useful.
os :: String -> OsString Source #
Fallibly converts String to OsString. Only intended to be used on literals.
Common utility functions
(</>) :: OsPath -> OsPath -> OsPath Source #
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
will access the same file as
</>
file)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"