Pathy

newtype Name :: DirOrFile -> Typenewtype Name n

A type used for both directory and file names, indexed by DirOrFile.

Constructors

• Name NonEmptyString

Instances

• Newtype (Name n) _
• Eq (Name a)
• Ord (Name a)
• Show (Name a)

splitName :: forall n. Name n -> { ext :: Maybe NonEmptyString, name :: NonEmptyString }

Splits Name in name and extension part.

splitName (Name ".foo")    == { name: ".foo", extension: Nothing }
splitName (Name "foo.")    == { name: "foo.", extension: Nothing }
splitName (Name "foo")     == { name: "foo",  extension: Nothing }
splitName (Name ".")       == { name: ".",    extension: Nothing }
splitName (Name "foo.baz") == { name: "foo",  extension: Just "baz" }

Note, in real code all strings from this examples would be NonEmptyString.

Also for any Name this property holds:

joinName <<< splitName = id

see joinName.

joinName :: forall n. { ext :: Maybe NonEmptyString, name :: NonEmptyString } -> Name n

Joins name and extension part into one Name.

Also for any Name this property holds:

joinName <<< splitName = id

see splitName.

extension :: forall n. Name n -> Maybe NonEmptyString

Retrieves the extension of a name. also see splitName

extension (Name ".foo")    == Nothing
extension (Name "foo.")    == Nothing
extension (Name ".")       == Nothing
extension (Name "foo.baz") == Just "baz"

Note, in real code all strings from this examples would be NonEmptyString.

alterExtension :: forall n. (Maybe NonEmptyString -> Maybe NonEmptyString) -> Name n -> Name n

Alters an extension of a name. This allows extensions to be added, removed, or modified. see splitName and joinName for how a Name is split into name and extention part and joined back into a Name.

Also for any Name this property holds:

alterExtension id = id

newtype Parser

Constructors

• Parser (forall z. (RelDir -> z) -> (AbsDir -> z) -> (RelFile -> z) -> (AbsFile -> z) -> z -> String -> z)

posixParser :: Parser

A parser for POSIX paths.

parseRelFile :: Parser -> String -> Maybe RelFile

Attempts to parse a relative file.

parseRelDir :: Parser -> String -> Maybe RelDir

Attempts to parse a relative directory.

parsePath :: forall z. Parser -> (RelDir -> z) -> (AbsDir -> z) -> (RelFile -> z) -> (AbsFile -> z) -> z -> String -> z

parseAbsFile :: Parser -> String -> Maybe AbsFile

Attempts to parse an absolute file.

parseAbsDir :: Parser -> String -> Maybe AbsDir

Attempts to parse an absolute directory.

type RelPath = AnyPath Rel

A type describing a relative file or directory path.

type RelFile = Path Rel File

A type describing a file whose location is given relative to some other, unspecified directory (referred to as the "current directory").

type RelDir = Path Rel Dir

A type describing a directory whose location is given relative to some other, unspecified directory (referred to as the "current directory").

data Path :: RelOrAbs -> DirOrFile -> Typedata Path a b

A type that describes a Path. All flavors of paths are described by this type, whether they are absolute or relative paths and whether they refer to files or directories.

• The type parameter a describes whether the path is Rel or Abs.
• The type parameter b describes whether the path is File or Dir.

To ensure type safety, there is no way for users to create a value of this type directly. Instead, helpers should be used, such as rootDir, currentDir, file, dir, (</>), and parsePath.

This ADT allows invalid paths (e.g. paths inside files), but there is no possible way for such paths to be constructed by user-land code.

Instances

• Eq (Path a b)
• Ord (Path a b)
• (IsRelOrAbs a, IsDirOrFile b) => Show (Path a b)

type AnyPath :: RelOrAbs -> Typetype AnyPath a = Either (Path a Dir) (Path a File)

A type describing a file or directory path.

type AnyFile = Either AbsFile RelFile

A type describing a absolute or relative file path.

type AnyDir = Either AbsDir RelDir

A type describing a absolute or relative directory path.

type AbsPath = AnyPath Abs

A type describing an absolute file or directory path.

type AbsFile = Path Abs File

A type describing a file whose location is absolutely specified.

type AbsDir = Path Abs Dir

A type describing a directory whose location is absolutely specified.

setExtension :: forall a b. Path a b -> String -> Path a b

Sets the extension on the terminal segment of a path. If the path is rootDir / currentDir or a relative path that is ascending (../) this will have no effect.

file "image" <.> "png"

See splitName and alterExtension fore more examples.

rootDir :: Path Abs Dir

The root directory, which can be used to define absolutely-located resources.

renameTraverse :: forall f a b. Applicative f => (Name b -> f (Name b)) -> Path a b -> f (Path a b)

Attempts to rename the terminal segment of a path using a function that returns the result in some Applicative. If the path is rootDir / currentDir or a relative path that is ascending (../) this will have no effect.

rename :: forall a b. (Name b -> Name b) -> Path a b -> Path a b

Attempts to rename the terminal segment of a path. If the path is rootDir / currentDir or a relative path that is ascending (../) this will have no effect.

relativeTo :: forall b. Path Abs b -> Path Abs Dir -> Path Rel b

Makes a path relative to a reference path. This function is best explaned using this property:

a == r </> a `relativeTo` r

refine :: forall a b. IsDirOrFile b => (Name File -> Name File) -> (Name Dir -> Name Dir) -> Path a b -> Path a b

Refines path segments but does not change anything else.

peelFile :: forall a. Path a File -> Tuple (Path a Dir) (Name File)

Peels off the last director and terminal file from a path. Unlike the general peel function this is guaranteed to return a result, as File paths are known to have a name.

peel :: forall a b. Path a b -> Maybe (Tuple (Path a Dir) (Name b))

Peels off the last directory and the terminal file or directory name from the path. Returns Nothing if the path is rootDir / currentDir or a relative path that is ascending (../)

parentOf :: forall a. IsRelOrAbs a => Path a Dir -> Path a Dir

Creates a path that points to the parent directory of the specified path.

Calling parentOf on rootDir will return rootDir.

parentAppend :: forall a b. IsRelOrAbs a => Path a Dir -> Path Rel b -> Path a b

Ascends into the parent of the specified directory, then descends into the specified path.

rootDir </> dir "foo" <..> dir "bar" = rootDir </> dir "bar"

name :: forall a b. IsRelOrAbs a => IsDirOrFile b => Path a b -> Maybe (Name b)

Retrieves the name of the terminal segment in a path. Returns Nothing if the path is rootDir / currentDir or some parentOf p.

in' :: forall a. Name a -> Path Rel a

Creates a path which points to a relative directory or file of the specified name. In most cases dir' or file' should be used instead, but it's still there in case the segment type is going to be determined based on some type variable.

p == maybe p (\(Tuple r n) -> r </> in' n) (peel p)

foldPath :: forall a b r. r -> (Path Rel Dir -> r) -> (Path a Dir -> Name b -> r) -> Path a b -> r

A fold over Paths. Since Path has private constructors, this allows for functions to be written over its constructors, similar to a total pattern match.

• The first argument is the value to return for the currentDir/rootDir at the base of the path.
• The second argument is a function for handling a step into the parent directory of the path it receives (eliminates parentOf).
• The third argument is a function representing a file or directory within the directory of the path it receives (eliminates extendPath).

fileName :: forall a. Path a File -> Name File

Retrieves the name of a file path. Unlike the general name function, this is guaranteed to return a result, as File paths are known to have a name.

file' :: Name File -> Path Rel File

Creates a path which points to a relative file of the specified name.

file :: forall s proxy. IsName s => proxy s -> Path Rel File

Creates a path which points to a relative file of the specified name.

Instead of accepting a runtime value, this function accepts a type-level string via a proxy, to ensure the constructed name is not empty.

extendPath :: forall a b. Path a Dir -> Name b -> Path a b

Extends a path with a file or directory under the current path.

dir' :: Name Dir -> Path Rel Dir

Creates a path which points to a relative directory of the specified name.

dir :: forall s proxy. IsName s => proxy s -> Path Rel Dir

Creates a path which points to a relative directory of the specified name.

Instead of accepting a runtime value, this function accepts a type-level string via a proxy, to ensure the constructed name is not empty.

currentDir :: Path Rel Dir

The "current directory", which can be used to define relatively-located resources.

appendPath :: forall a b. IsRelOrAbs a => Path a Dir -> Path Rel b -> Path a b

Given a directory path, appends a relative path to extend the original path.

Operator alias for Pathy.Path.appendPath (left-associative / precedence 6)

Operator alias for Pathy.Path.setExtension (left-associative / precedence 6)

Operator alias for Pathy.Path.parentAppend (left-associative / precedence 6)

data Rel :: RelOrAbs

The phantom type of relative paths.

Instances

• IsRelOrAbs Rel

data File :: DirOrFile

The phantom type of files.

Instances

• IsDirOrFile File

data Dir :: DirOrFile

The phantom type of directories.

Instances

• IsDirOrFile Dir

data Abs :: RelOrAbs

The phantom type of absolute paths.

Instances

• IsRelOrAbs Abs

class IsDirOrFile :: DirOrFile -> Constraintclass IsDirOrFile b  where

A class that enables writing operations that abstract over DirOrFile.

The provided onDirOrFile function folds over a value indexed by DirOrFile to produce a new result, passing proof/coercion functions to allow the inner functions to unify their return types if remapping.

Members

• onDirOrFile :: forall f r. ((f Dir -> f b) -> f Dir -> r) -> ((f File -> f b) -> f File -> r) -> f b -> r

Instances

• IsDirOrFile Dir
• IsDirOrFile File

class IsRelOrAbs :: RelOrAbs -> Constraintclass IsRelOrAbs a  where

A class that enables writing operations that abstract over RelOrAbs.

The provided onRelOrAbs function folds over a value indexed by RelOrAbs to produce a new result, passing proof/coercion functions to allow the inner functions to unify their return types if remapping.

Members

• onRelOrAbs :: forall (f :: RelOrAbs -> DirOrFile -> Type) b r. ((f Rel b -> f a b) -> f Rel b -> r) -> ((f Abs b -> f a b) -> f Abs b -> r) -> f a b -> r

Instances

• IsRelOrAbs Rel
• IsRelOrAbs Abs

foldRelOrAbs :: forall f a b r. IsRelOrAbs a => (f Rel b -> r) -> (f Abs b -> r) -> f a b -> r

Folds over a value that uses RelOrAbs to produce a new result.

foldDirOrFile :: forall f b r. IsDirOrFile b => (f Dir -> r) -> (f File -> r) -> f b -> r

Folds over a value that uses DirOrFile to produce a new result.

type Printer = { current :: NonEmptyString, escaper :: Escaper, root :: Maybe NonEmptyString -> String, sep :: NonEmptyString, up :: NonEmptyString }

A Printer defines options for printing paths.

• root is a function used to construct the initial segment of paths.
• current is a representation of the current directory.
• up is a representation of going up to the parent directory.
• sep is the string to separate path segments by.
• escaper specified how to deal with printing reserved names and characters.

newtype Escaper

An Escaper encodes segments or characters which have reserved meaning within names in a path.

Constructors

• Escaper (NonEmptyString -> NonEmptyString)

Instances

• Newtype Escaper _
• Semigroup Escaper
• Monoid Escaper

windowsPrinter :: Printer

A printer for Windows paths.

unsafePrintPath :: forall a b. IsRelOrAbs a => IsDirOrFile b => Printer -> SandboxedPath a b -> String

Prints a SandboxedPath into its canonical String representation, using the specified printer. This will print a relative path if b ~ Rel, which depending on how the resulting string is used, may be unsafe.

printPath :: forall a b. IsRelOrAbs a => IsDirOrFile b => Printer -> SandboxedPath a b -> String

Prints a SandboxedPath into its canonical String representation, using the specified printer. The printed path will always be absolute, as this is the only way to ensure the path is safely referring to the intended location.

posixPrinter :: Printer

A printer for POSIX paths.

debugPrintPath :: forall a b. Warn (Text "debugPrintPath usage") => IsRelOrAbs a => IsDirOrFile b => Printer -> Path a b -> String

Prints a path exactly according to its representation. This should only be used for debug purposes. Using this function will raise a warning at compile time as a reminder!

data SandboxedPath :: RelOrAbs -> DirOrFile -> Typedata SandboxedPath a b

The type for paths that have been sandboxed.

Instances

• (IsRelOrAbs a, IsDirOrFile b) => Eq (SandboxedPath a b)
• (IsRelOrAbs a, IsDirOrFile b) => Ord (SandboxedPath a b)
• (IsRelOrAbs a, IsDirOrFile b) => Show (SandboxedPath a b)

unsandbox :: forall a b. SandboxedPath a b -> Path a b

Extracts the original path from a SandboxedPath.

sandboxRoot :: forall a b. SandboxedPath a b -> Path Abs Dir

Returns the location a SandboxedPath was sandboxed to.

sandboxAny :: forall a b. Path a b -> SandboxedPath a b

Sandboxes any path to /.

This should only be used for situations where a path is already constrained within a system so that access to / is safe - for instance, in URIs.

sandbox :: forall a b. IsRelOrAbs a => Path Abs Dir -> Path a b -> Maybe (SandboxedPath a b)

Attempts to sandbox a path relative to an absolute directory ("sandbox root"). If the Path a b escapes the sandbox root Nothing will be returned.