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doublestar

Path pattern matching and globbing supporting doublestar (**) patterns.

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About

Updating from v1 to v2?

doublestar is a golang implementation of path pattern matching and globbing with support for "doublestar" (aka globstar: **) patterns.

doublestar patterns match files and directories recursively. For example, if you had the following directory structure:

grandparent
`-- parent
    |-- child1
    `-- child2

You could find the children with patterns such as: **/child*, grandparent/**/child?, **/parent/*, or even just ** by itself (which will return all files and directories recursively).

Bash's globstar is doublestar's inspiration and, as such, works similarly. Note that the doublestar must appear as a path component by itself. A pattern such as /path** is invalid and will be treated the same as /path*, but /path*/** should achieve the desired result. Additionally, /path/** will match all directories and files under the path directory, but /path/**/ will only match directories.

Installation

doublestar can be installed via go get:

go get github.com/bmatcuk/doublestar/v2

To use it in your code, you must import it:

import "github.com/bmatcuk/doublestar/v2"

Usage

Match

func Match(pattern, name string) (bool, error)

Match returns true if name matches the file name pattern (see below). name and pattern are split on forward slash (/) characters and may be relative or absolute.

Note: Match() is meant to be a drop-in replacement for path.Match(). As such, it always uses / as the path separator. If you are writing code that will run on systems where / is not the path separator (such as Windows), you want to use PathMatch() (below) instead.

PathMatch

func PathMatch(pattern, name string) (bool, error)

PathMatch returns true if name matches the file name pattern (see below). The difference between Match and PathMatch is that PathMatch will automatically use your system's path separator to split name and pattern.

PathMatch() is meant to be a drop-in replacement for filepath.Match().

Glob

func Glob(pattern string) ([]string, error)

Glob finds all files and directories in the filesystem that match pattern (see below). pattern may be relative (to the current working directory), or absolute.

Glob() is meant to be a drop-in replacement for filepath.Glob().

Patterns

doublestar supports the following special terms in the patterns:

Special Terms Meaning
* matches any sequence of non-path-separators
** matches any sequence of characters, including path separators
? matches any single non-path-separator character
[class] matches any single non-path-separator character against a class of characters (see below)
{alt1,...} matches a sequence of characters if one of the comma-separated alternatives matches

Any character with a special meaning can be escaped with a backslash (\).

A mid-pattern doublestar (**) behaves like bash's globstar option: a pattern such as path/to/**.txt would return the same results as path/to/*.txt. The pattern you're looking for is path/to/**/*.txt.

Character Classes

Character classes support the following:

Class Meaning
[abc] matches any single character within the set
[a-z] matches any single character in the range
[^class] matches any single character which does not match the class

Abstracting the os package

doublestar by default uses the Open, Stat, and Lstat, functions and PathSeparator value from the standard library's os package. To abstract this, for example to be able to perform tests of Windows paths on Linux, or to interoperate with your own filesystem code, it includes the functions GlobOS and PathMatchOS which are identical to Glob and PathMatch except that they operate on an OS interface:

type OS interface {
    Lstat(name string) (os.FileInfo, error)
    Open(name string) (*os.File, error)
    PathSeparator() rune
    Stat(name string) (os.FileInfo, error)
}

StandardOS is a value that implements this interface by calling functions in the standard library's os package.

License

MIT License

About

Implements support for double star (**) matches in golang's path.Match and filepath.Glob.

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