pathtype

package module
v0.3.0 Latest Latest
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 Go to latest Published: Aug 3, 2021 License: MIT Imports: 4 Imported by: 0

README

pathtype

Add a type for paths in Go. This small package basically just wraps "path/filepath" from the Standard library.

Example

Code
package main

import (
	"fmt"
	"log"

	pt "github.com/jonchun/pathtype"
)

type path = pt.Path

func main() {
	myFile := path("myfile.txt")
	exampleFile := path("example/example.txt")
	fmt.Println(exampleFile.Dir())
	fmt.Println(exampleFile.Dir().Join(myFile))

	res, err := exampleFile.Dir().Join(myFile).Dir().Abs()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(res)

	fmt.Println("=========================")
	listBase(res)
	fmt.Println("=========================")
	listExt(res)
}

// list all Base for files in p
func listBase(p path) {
	if glob, err := p.Glob("*"); err != nil {
		log.Fatal(err)
	} else {
		for _, match := range glob {
			fmt.Println(match.Base())
		}
	}
}

// list all extensions for files in p
func listExt(p path) {
	if glob, err := p.Glob("*"); err != nil {
		log.Fatal(err)
	} else {
		for _, match := range glob {
			fmt.Println(match.Ext())
		}
	}
}
Output
example
example/myfile.txt
/home/jonchun/example_module/example
=========================
1.log
2.log
example.txt
=========================
.log
.log
.txt

See GoDoc for documentation, but it should be pretty self-explanatory.

TODO

  • Add wrappers for other packages that take paths as strings. e.g: os Would be nice to have syntax similar to

    import pt "github.com/jonchun/pathtype"
type path = pt.Path

func example(p path) {
    pt.Chmod(p, 0644)
}

Documentation

Overview

This is a small wrapper around the filepath API that allows using file paths as their own type

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Path 

type Path string

func Executable 

func Executable() (Path, error)

Executable returns the path name for the executable that started the current process. There is no guarantee that the path is still pointing to the correct executable. If a symlink was used to start the process, depending on the operating system, the result might be the symlink or the path it pointed to. If a stable result is needed, path/filepath.EvalSymlinks might help.

Executable returns an absolute path unless an error occurred.

The main use case is finding resources located relative to an executable.

func Getwd 

func Getwd() (dir Path, err error)

Getwd returns a rooted path name corresponding to the current directory. If the current directory can be reached via multiple paths (due to symbolic links), Getwd may return any one of them.

func SplitList 

func SplitList(path string) []Path

SplitList splits a list of paths joined by the OS-specific ListSeparator, usually found in PATH or GOPATH environment variables. Unlike strings.Split, SplitList returns an empty slice when passed an empty string.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	fmt.Println("On Unix:", pt.SplitList("/a/b/c:/usr/bin"))
}

Output:

On Unix: [/a/b/c /usr/bin]

func TempDir 

func TempDir() Path

TempDir returns the default directory to use for temporary files.

On Unix systems, it returns $TMPDIR if non-empty, else /tmp. On Windows, it uses GetTempPath, returning the first non-empty value from %TMP%, %TEMP%, %USERPROFILE%, or the Windows directory. On Plan 9, it returns /tmp.

The directory is neither guaranteed to exist nor have accessible permissions.

func UserCacheDir 

func UserCacheDir() (Path, error)

UserCacheDir returns the default root directory to use for user-specific cached data. Users should create their own application-specific subdirectory within this one and use that.

On Unix systems, it returns $XDG_CACHE_HOME as specified by https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html if non-empty, else $HOME/.cache. On Darwin, it returns $HOME/Library/Caches. On Windows, it returns %LocalAppData%. On Plan 9, it returns $home/lib/cache.

If the location cannot be determined (for example, $HOME is not defined), then it will return an error.

func UserConfigDir 

func UserConfigDir() (Path, error)

UserConfigDir returns the default root directory to use for user-specific configuration data. Users should create their own application-specific subdirectory within this one and use that.

On Unix systems, it returns $XDG_CONFIG_HOME as specified by https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html if non-empty, else $HOME/.config. On Darwin, it returns $HOME/Library/Application Support. On Windows, it returns %AppData%. On Plan 9, it returns $home/lib.

If the location cannot be determined (for example, $HOME is not defined), then it will return an error.

func UserHomeDir 

func UserHomeDir() (Path, error)

UserHomeDir returns the current user's home directory.

On Unix, including macOS, it returns the $HOME environment variable. On Windows, it returns %USERPROFILE%. On Plan 9, it returns the $home environment variable.

func (Path) Abs 

func (path Path) Abs() (Path, error)

Abs returns an absolute representation of path. If the path is not absolute it will be joined with the current working directory to turn it into an absolute path. The absolute path name for a given file is not guaranteed to be unique. Abs calls Clean on the result.

func (Path) Base 

func (path Path) Base() Path

Base returns the last element of path. Trailing path separators are removed before extracting the last element. If the path is empty, Base returns ".". If the path consists entirely of separators, Base returns a single separator.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path
	fmt.Println("On Unix:")
	fmt.Println(path("/foo/bar/baz.js").Base())
	fmt.Println(path("/foo/bar/baz").Base())
	fmt.Println(path("/foo/bar/baz/").Base())
	fmt.Println(path("dev.txt").Base())
	fmt.Println(path("../todo.txt").Base())
	fmt.Println(path("..").Base())
	fmt.Println(path(".").Base())
	fmt.Println(path("/").Base())
	fmt.Println(path("").Base())

}

Output:

On Unix:
baz.js
baz
baz
dev.txt
todo.txt
..
.
/
.

func (Path) Chdir 

func (path Path) Chdir() error

Chdir changes the current working directory to the directory at path. If there is an error, it will be of type *PathError.

func (Path) Chmod 

func (path Path) Chmod(mode os.FileMode) error

Chmod changes the mode of the file at path to mode. If the file is a symbolic link, it changes the mode of the link's target. If there is an error, it will be of type *PathError.

A different subset of the mode bits are used, depending on the operating system.

On Unix, the mode's permission bits, ModeSetuid, ModeSetgid, and ModeSticky are used.

On Windows, only the 0200 bit (owner writable) of mode is used; it controls whether the file's read-only attribute is set or cleared. The other bits are currently unused. For compatibility with Go 1.12 and earlier, use a non-zero mode. Use mode 0400 for a read-only file and 0600 for a readable+writable file.

On Plan 9, the mode's permission bits, ModeAppend, ModeExclusive, and ModeTemporary are used.

func (Path) Chown 

func (path Path) Chown(uid, gid int) error

Chown changes the numeric uid and gid of the file at path. If the file is a symbolic link, it changes the uid and gid of the link's target. A uid or gid of -1 means to not change that value. If there is an error, it will be of type *PathError.

On Windows or Plan 9, Chown always returns the syscall.EWINDOWS or EPLAN9 error, wrapped in *PathError.

func (Path) Chtimes 

func (path Path) Chtimes(atime time.Time, mtime time.Time) error

Chtimes changes the access and modification times of the file at path, similar to the Unix utime() or utimes() functions.

The underlying filesystem may truncate or round the values to a less precise time unit. If there is an error, it will be of type *PathError.

func (Path) Clean 

func (path Path) Clean() Path

Clean returns the shortest path name equivalent to path by purely lexical processing. It applies the following rules iteratively until no further processing can be done:

  1. Replace multiple Separator elements with a single one.
  2. Eliminate each . path name element (the current directory).
  3. Eliminate each inner .. path name element (the parent directory) along with the non-.. element that precedes it.
  4. Eliminate .. elements that begin a rooted path: that is, replace "/.." by "/" at the beginning of a path, assuming Separator is '/'.

The returned path ends in a slash only if it represents a root directory, such as "/" on Unix or `C:\` on Windows.

Finally, any occurrences of slash are replaced by Separator.

If the result of this process is an empty string, Clean returns the string ".".

See also Rob Pike, “Lexical File Names in Plan 9 or Getting Dot-Dot Right,” https://9p.io/sys/doc/lexnames.html

func (Path) Dir 

func (path Path) Dir() Path

Dir returns all but the last element of path, typically the path's directory. After dropping the final element, Dir calls Clean on the path and trailing slashes are removed. If the path is empty, Dir returns ".". If the path consists entirely of separators, Dir returns a single separator. The returned path does not end in a separator unless it is the root directory.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path
	fmt.Println("On Unix:")
	fmt.Println(path("/foo/bar/baz.js").Dir())
	fmt.Println(path("/foo/bar/baz").Dir())
	fmt.Println(path("/foo/bar/baz/").Dir())
	fmt.Println(path("/dirty//path///").Dir())
	fmt.Println(path("dev.txt").Dir())
	fmt.Println(path("../todo.txt").Dir())
	fmt.Println(path("..").Dir())
	fmt.Println(path(".").Dir())
	fmt.Println(path("/").Dir())
	fmt.Println(path("").Dir())

}

Output:

On Unix:
/foo/bar
/foo/bar
/foo/bar/baz
/dirty/path
.
..
.
.
/
.

func (Path) DirFS 

func (path Path) DirFS() fs.FS

DirFS returns a file system (an fs.FS) for the tree of files rooted at the directory at path.

Note that DirFS("/prefix") only guarantees that the Open calls it makes to the operating system will begin with "/prefix": DirFS("/prefix").Open("file") is the same as os.Open("/prefix/file"). So if /prefix/file is a symbolic link pointing outside the /prefix tree, then using DirFS does not stop the access any more than using os.Open does. DirFS is therefore not a general substitute for a chroot-style security mechanism when the directory tree contains arbitrary content. 

func (path Path) EvalSymlinks() (Path, error)

EvalSymlinks returns path's name after the evaluation of any symbolic links. If path is relative the result will be relative to the current directory, unless one of the components is an absolute symbolic link. EvalSymlinks calls Clean on the result.

func (Path) Ext 

func (path Path) Ext() string

Ext returns the file name extension used by path. The extension is the suffix beginning at the final dot in the final element of path; it is empty if there is no dot.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path
	fmt.Printf("No dots: %q\n", path("index").Ext())
	fmt.Printf("One dot: %q\n", path("index.js").Ext())
	fmt.Printf("Two dots: %q\n", path("main.test.js").Ext())
}

Output:

No dots: ""
One dot: ".js"
Two dots: ".js"

func (Path) FromSlash 

func (path Path) FromSlash() Path

FromSlash returns the result of replacing each slash ('/') character in path with a separator character. Multiple slashes are replaced by multiple separators.

func (Path) Glob 

func (path Path) Glob(pattern string) (matches []Path, err error)

Glob returns the names of all files matching path.Join(pattern) or nil if there is no matching file. The syntax of patterns is the same as in Match. The pattern may describe hierarchical names such as /usr/*/bin/ed (assuming the Separator is '/').

Glob ignores file system errors such as I/O errors reading directories. The only possible returned error is ErrBadPattern, when pattern is malformed.

func (Path) IsAbs 

func (path Path) IsAbs() bool

IsAbs reports whether the path is absolute.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path
	fmt.Println("On Unix:")
	fmt.Println(path("/home/gopher").IsAbs())
	fmt.Println(path(".bashrc").IsAbs())
	fmt.Println(path("..").IsAbs())
	fmt.Println(path(".").IsAbs())
	fmt.Println(path("/").IsAbs())
	fmt.Println(path("").IsAbs())

}

Output:

On Unix:
true
false
false
false
true
false

func (Path) Join 

func (path Path) Join(elem ...Path) Path

Join joins any number of path elements into path, separating them with an OS specific Separator. Empty elements are ignored. The result is Cleaned. However, if the argument list is empty or all its elements are empty, Join returns an empty string. On Windows, the result will only be a UNC path if the first non-empty element is a UNC path.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path
	fmt.Println("On Unix:")
	fmt.Println(path("a").Join(path("b"), path("c")))
	fmt.Println(path("a").Join(path("b/c")))
	fmt.Println(path("a/b").Join(path("c")))
	fmt.Println(path("a/b").Join(path("/c")))

	fmt.Println(path("a/b").Join(path("../../../xyz")))

}

Output:

On Unix:
a/b/c
a/b/c
a/b/c
a/b/c
../xyz

func (Path) Lchown 

func (path Path) Lchown(uid, gid int) error

Lchown changes the numeric uid and gid of the file at path. If the file is a symbolic link, it changes the uid and gid of the link itself. If there is an error, it will be of type *PathError.

On Windows, it always returns the syscall.EWINDOWS error, wrapped in *PathError. 

func (path Path) Link(newname string) error

Link creates newname as a hard link to the path. If there is an error, it will be of type *os.LinkError.

func (Path) Match 

func (path Path) Match(pattern string) (bool, error)

Match reports whether the path matches the shell file name pattern. The pattern syntax is: 

pattern:
	{ term }
term:
	'*'         matches any sequence of non-Separator characters
	'?'         matches any single non-Separator character
	'[' [ '^' ] { character-range } ']'
	            character class (must be non-empty)
	c           matches character c (c != '*', '?', '\\', '[')
	'\\' c      matches character c

character-range:
	c           matches character c (c != '\\', '-', ']')
	'\\' c      matches character c
	lo '-' hi   matches character c for lo <= c <= hi

Match requires pattern to match all of name, not just a substring. The only possible returned error is ErrBadPattern, when pattern is malformed.

On Windows, escaping is disabled. Instead, '\\' is treated as path separator.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path
	fmt.Println("On Unix:")
	fmt.Println(path("/home/catch/foo").Match("/home/catch/*"))
	fmt.Println(path("/home/catch/foo/bar").Match("/home/catch/*"))
	fmt.Println(path("/home/gopher").Match("/home/?opher"))
	fmt.Println(path("/home/*").Match("/home/\\*"))

}

Output:

On Unix:
true <nil>
false <nil>
true <nil>
true <nil>

func (Path) Mkdir 

func (path Path) Mkdir(perm os.FileMode) error

Mkdir creates a new directory at path with the specified permission bits (before umask). If there is an error, it will be of type *os.PathError.

func (Path) MkdirAll 

func (path Path) MkdirAll(perm os.FileMode) error

MkdirAll creates a directory at path, along with any necessary parents, and returns nil, or else returns an error. The permission bits perm (before umask) are used for all directories that MkdirAll creates. If path is already a directory, MkdirAll does nothing and returns nil.

func (Path) MkdirTemp 

func (path Path) MkdirTemp(pattern string) (Path, error)

MkdirTemp creates a new temporary directory in path and returns the pathname of the new directory. The new directory's name is generated by adding a random string to the end of pattern. If pattern includes a "*", the random string replaces the last "*" instead. If path is empty, MkdirTemp uses the default directory for temporary files, as returned by TempDir. Multiple programs or goroutines calling MkdirTemp simultaneously will not choose the same directory. It is the caller's responsibility to remove the directory when it is no longer needed. 

func (path Path) Readlink() (Path, error)

Readlink returns the destination of the named symbolic link. If there is an error, it will be of type *os.PathError.

func (Path) Rel 

func (path Path) Rel(targpath Path) (Path, error)

Rel returns a relative path that is lexically equivalent to targpath when joined to path with an intervening separator. That is, path.Join(path.Rel(targpath)) is equivalent to targpath itself. On success, the returned path will always be relative to path, even if path and targpath share no elements. An error is returned if targpath can't be made relative to path or if knowing the current working directory would be necessary to compute it. Rel calls Clean on the result.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path

	paths := []path{
		path("/a/b/c"),
		path("/b/c"),
		path("./b/c"),
	}
	base := path("/a")

	fmt.Println("On Unix:")
	for _, p := range paths {
		rel, err := base.Rel(p)
		fmt.Printf("%q: %q %v\n", p, rel, err)
	}

}

Output:

On Unix:
"/a/b/c": "b/c" <nil>
"/b/c": "../b/c" <nil>
"./b/c": "" Rel: can't make ./b/c relative to /a

func (Path) Remove 

func (path Path) Remove() error

Remove removes the path. If there is an error, it will be of type *os.PathError.

func (Path) RemoveAll 

func (path Path) RemoveAll() error

RemoveAll removes path and any children it contains. It removes everything it can but returns the first error it encounters. If the path does not exist, RemoveAll returns nil (no error). If there is an error, it will be of type *os.PathError.

func (Path) Rename 

func (path Path) Rename(newpath Path) error

Rename renames (moves) path to newpath. If newpath already exists and is not a directory, Rename replaces it. OS-specific restrictions may apply when path and newpath are in different directories. If there is an error, it will be of type *os.LinkError.

func (Path) Split 

func (path Path) Split() (dir, file Path)

Split splits the path immediately following the final Separator, separating it into a directory and file name component. If there is no Separator in path, Split returns an empty dir and file set to path. The returned values have the property that path = dir+file.

Example 
package main

import (
	"fmt"

	pt "github.com/jonchun/pathtype"
)

func main() {
	type path = pt.Path

	paths := []path{
		path("/home/arnie/amelia.jpg"),
		path("/mnt/photos/"),
		path("rabbit.jpg"),
		path("/usr/local//go"),
	}
	fmt.Println("On Unix:")
	for _, p := range paths {
		dir, file := p.Split()
		fmt.Printf("input: %q\n\tdir: %q\n\tfile: %q\n", p, dir, file)
	}
}

Output:

On Unix:
input: "/home/arnie/amelia.jpg"
	dir: "/home/arnie/"
	file: "amelia.jpg"
input: "/mnt/photos/"
	dir: "/mnt/photos/"
	file: ""
input: "rabbit.jpg"
	dir: ""
	file: "rabbit.jpg"
input: "/usr/local//go"
	dir: "/usr/local//"
	file: "go"

func (path Path) Symlink(newname string) error

Symlink creates newname as a symbolic link to the path. If there is an error, it will be of type *os.LinkError..

func (Path) ToSlash 

func (path Path) ToSlash() Path

ToSlash returns the result of replacing each separator character in path with a slash ('/') character. Multiple separators are replaced by multiple slashes.

func (Path) Truncate 

func (path Path) Truncate(size int64) error

Truncate changes the size of the path. If the file is a symbolic link, it changes the size of the link's target. If there is an error, it will be of type *os.PathError.

func (Path) VolumeName 

func (path Path) VolumeName() Path

VolumeName returns leading volume name. Given "C:\foo\bar" it returns "C:" on Windows. Given "\\host\share\foo" it returns "\\host\share". On other platforms it returns "".

func (Path) Walk 

func (path Path) Walk(fn filepath.WalkFunc) error

Walk walks the file tree rooted at path, calling fn for each file or directory in the tree, including path.

All errors that arise visiting files and directories are filtered by fn: see the WalkFunc documentation for details.

The files are walked in lexical order, which makes the output deterministic but requires Walk to read an entire directory into memory before proceeding to walk that directory.

Walk does not follow symbolic links.

Walk is less efficient than WalkDir, introduced in Go 1.16, which avoids calling os.Lstat on every visited file or directory.

func (Path) WalkDir 

func (path Path) WalkDir(fn fs.WalkDirFunc) error

WalkDir walks the file tree rooted at path, calling fn for each file or directory in the tree, including path.

All errors that arise visiting files and directories are filtered by fn: see the fs.WalkDirFunc documentation for details.

The files are walked in lexical order, which makes the output deterministic but requires WalkDir to read an entire directory into memory before proceeding to walk that directory.

WalkDir does not follow symbolic links.

func (Path) WriteFile 

func (path Path) WriteFile(data []byte, perm os.FileMode) error

WriteFile writes data to the named file, creating it if necessary. If the file does not exist, WriteFile creates it with permissions perm (before umask); otherwise WriteFile truncates it before writing, without changing permissions.

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