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# ignore
`ignore` is a manager, filter and parser which implemented in pure JavaScript according to the [.gitignore spec 2.22.1](http://git-scm.com/docs/gitignore).
`ignore` is used by eslint, gitbook and [many others](https://www.npmjs.com/browse/depended/ignore).
Pay **ATTENTION** that [`minimatch`](https://www.npmjs.org/package/minimatch) (which used by `fstream-ignore`) does not follow the gitignore spec.
To filter filenames according to a .gitignore file, I recommend this npm package, `ignore`.
To parse an `.npmignore` file, you should use `minimatch`, because an `.npmignore` file is parsed by npm using `minimatch` and it does not work in the .gitignore way.
### Tested on
`ignore` is fully tested, and has more than **five hundreds** of unit tests.
- Linux + Node: `0.8` - `7.x`
- Windows + Node: `0.10` - `7.x`, node < `0.10` is not tested due to the lack of support of appveyor.
Actually, `ignore` does not rely on any versions of node specially.
Since `4.0.0`, ignore will no longer support `node < 6` by default, to use in node < 6, `require('ignore/legacy')`. For details, see [CHANGELOG](https://github.com/kaelzhang/node-ignore/blob/master/CHANGELOG.md).
## Table Of Main Contents
- [Usage](#usage)
- [`Pathname` Conventions](#pathname-conventions)
- See Also:
- [`glob-gitignore`](https://www.npmjs.com/package/glob-gitignore) matches files using patterns and filters them according to gitignore rules.
- [Upgrade Guide](#upgrade-guide)
## Install
```sh
npm i ignore
```
## Usage
```js
import ignore from 'ignore'
const ig = ignore().add(['.abc/*', '!.abc/d/'])
```
### Filter the given paths
```js
const paths = [
'.abc/a.js', // filtered out
'.abc/d/e.js' // included
]
ig.filter(paths) // ['.abc/d/e.js']
ig.ignores('.abc/a.js') // true
```
### As the filter function
```js
paths.filter(ig.createFilter()); // ['.abc/d/e.js']
```
### Win32 paths will be handled
```js
ig.filter(['.abc\\a.js', '.abc\\d\\e.js'])
// if the code above runs on windows, the result will be
// ['.abc\\d\\e.js']
```
## Why another ignore?
- `ignore` is a standalone module, and is much simpler so that it could easy work with other programs, unlike [isaacs](https://npmjs.org/~isaacs)'s [fstream-ignore](https://npmjs.org/package/fstream-ignore) which must work with the modules of the fstream family.
- `ignore` only contains utility methods to filter paths according to the specified ignore rules, so
- `ignore` never try to find out ignore rules by traversing directories or fetching from git configurations.
- `ignore` don't cares about sub-modules of git projects.
- Exactly according to [gitignore man page](http://git-scm.com/docs/gitignore), fixes some known matching issues of fstream-ignore, such as:
- '`/*.js`' should only match '`a.js`', but not '`abc/a.js`'.
- '`**/foo`' should match '`foo`' anywhere.
- Prevent re-including a file if a parent directory of that file is excluded.
- Handle trailing whitespaces:
- `'a '`(one space) should not match `'a '`(two spaces).
- `'a \ '` matches `'a '`
- All test cases are verified with the result of `git check-ignore`.
# Methods
## .add(pattern: string | Ignore): this
## .add(patterns: Array): this
- **pattern** `String | Ignore` An ignore pattern string, or the `Ignore` instance
- **patterns** `Array` Array of ignore patterns.
Adds a rule or several rules to the current manager.
Returns `this`
Notice that a line starting with `'#'`(hash) is treated as a comment. Put a backslash (`'\'`) in front of the first hash for patterns that begin with a hash, if you want to ignore a file with a hash at the beginning of the filename.
```js
ignore().add('#abc').ignores('#abc') // false
ignore().add('\#abc').ignores('#abc') // true
```
`pattern` could either be a line of ignore pattern or a string of multiple ignore patterns, which means we could just `ignore().add()` the content of a ignore file:
```js
ignore()
.add(fs.readFileSync(filenameOfGitignore).toString())
.filter(filenames)
```
`pattern` could also be an `ignore` instance, so that we could easily inherit the rules of another `Ignore` instance.
## .addIgnoreFile(path)
REMOVED in `3.x` for now.
To upgrade `ignore@2.x` up to `3.x`, use
```js
import fs from 'fs'
if (fs.existsSync(filename)) {
ignore().add(fs.readFileSync(filename).toString())
}
```
instead.
## .filter(paths: Array<Pathname>): Array<Pathname>
```ts
type Pathname = string
```
Filters the given array of pathnames, and returns the filtered array.
- **paths** `Array.` The array of `pathname`s to be filtered.
### `Pathname` Conventions:
#### 1. `Pathname` should be a `path.relative()`d pathname
`Pathname` should be a string that have been `path.join()`ed, or the return value of `path.relative()` to the current directory,
```js
// WRONG, an error will be thrown
ig.ignores('./abc')
// WRONG, for it will never happen, and an error will be thrown
// If the gitignore rule locates at the root directory,
// `'/abc'` should be changed to `'abc'`.
// ```
// path.relative('/', '/abc') -> 'abc'
// ```
ig.ignores('/abc')
// WRONG, that it is an absolute path on Windows, an error will be thrown
ig.ignores('C:\\abc')
// Right
ig.ignores('abc')
// Right
ig.ignores(path.join('./abc')) // path.join('./abc') -> 'abc'
```
In other words, each `Pathname` here should be a relative path to the directory of the gitignore rules.
Suppose the dir structure is:
```
/path/to/your/repo
|-- a
| |-- a.js
|
|-- .b
|
|-- .c
|-- .DS_store
```
Then the `paths` might be like this:
```js
[
'a/a.js'
'.b',
'.c/.DS_store'
]
```
#### 2. filenames and dirnames
`node-ignore` does NO `fs.stat` during path matching, so for the example below:
```js
// First, we add a ignore pattern to ignore a directory
ig.add('config/')
// `ig` does NOT know if 'config', in the real world,
// is a normal file, directory or something.
ig.ignores('config')
// `ig` treats `config` as a file, so it returns `false`
ig.ignores('config/')
// returns `true`
```
Specially for people who develop some library based on `node-ignore`, it is important to understand that.
Usually, you could use [`glob`](http://npmjs.org/package/glob) with `option.mark = true` to fetch the structure of the current directory:
```js
import glob from 'glob'
glob('**', {
// Adds a / character to directory matches.
mark: true
}, (err, files) => {
if (err) {
return console.error(err)
}
let filtered = ignore().add(patterns).filter(files)
console.log(filtered)
})
```
## .ignores(pathname: Pathname): boolean
> new in 3.2.0
Returns `Boolean` whether `pathname` should be ignored.
```js
ig.ignores('.abc/a.js') // true
```
## .createFilter()
Creates a filter function which could filter an array of paths with `Array.prototype.filter`.
Returns `function(path)` the filter function.
## .test(pathname: Pathname) since 5.0.0
Returns `TestResult`
```ts
interface TestResult {
ignored: boolean
// true if the `pathname` is finally unignored by some negative pattern
unignored: boolean
}
```
- `{ignored: true, unignored: false}`: the `pathname` is ignored
- `{ignored: false, unignored: true}`: the `pathname` is unignored
- `{ignored: false, unignored: false}`: the `pathname` is never matched by any ignore rules.
## static `ignore.isPathValid(pathname): boolean` since 5.0.0
Check whether the `pathname` is an valid `path.relative()`d path according to the [convention](#1-pathname-should-be-a-pathrelatived-pathname).
This method is **NOT** used to check if an ignore pattern is valid.
```js
ignore.isPathValid('./foo') // false
```
## ignore(options)
### `options.ignorecase` since 4.0.0
Similar as the `core.ignorecase` option of [git-config](https://git-scm.com/docs/git-config), `node-ignore` will be case insensitive if `options.ignorecase` is set to `true` (the default value), otherwise case sensitive.
```js
const ig = ignore({
ignorecase: false
})
ig.add('*.png')
ig.ignores('*.PNG') // false
```
### `options.ignoreCase?: boolean` since 5.2.0
Which is alternative to `options.ignoreCase`
### `options.allowRelativePaths?: boolean` since 5.2.0
This option brings backward compatibility with projects which based on `ignore@4.x`. If `options.allowRelativePaths` is `true`, `ignore` will not check whether the given path to be tested is [`path.relative()`d](#pathname-conventions).
However, passing a relative path, such as `'./foo'` or `'../foo'`, to test if it is ignored or not is not a good practise, which might lead to unexpected behavior
```js
ignore({
allowRelativePaths: true
}).ignores('../foo/bar.js') // And it will not throw
```
****
# Upgrade Guide
## Upgrade 4.x -> 5.x
Since `5.0.0`, if an invalid `Pathname` passed into `ig.ignores()`, an error will be thrown, unless `options.allowRelative = true` is passed to the `Ignore` factory.
While `ignore < 5.0.0` did not make sure what the return value was, as well as
```ts
.ignores(pathname: Pathname): boolean
.filter(pathnames: Array): Array
.createFilter(): (pathname: Pathname) => boolean
.test(pathname: Pathname): {ignored: boolean, unignored: boolean}
```
See the convention [here](#1-pathname-should-be-a-pathrelatived-pathname) for details.
If there are invalid pathnames, the conversion and filtration should be done by users.
```js
import {isPathValid} from 'ignore' // introduced in 5.0.0
const paths = [
// invalid
//////////////////
'',
false,
'../foo',
'.',
//////////////////
// valid
'foo'
]
.filter(isValidPath)
ig.filter(paths)
```
## Upgrade 3.x -> 4.x
Since `4.0.0`, `ignore` will no longer support node < 6, to use `ignore` in node < 6:
```js
var ignore = require('ignore/legacy')
```
## Upgrade 2.x -> 3.x
- All `options` of 2.x are unnecessary and removed, so just remove them.
- `ignore()` instance is no longer an [`EventEmitter`](nodejs.org/api/events.html), and all events are unnecessary and removed.
- `.addIgnoreFile()` is removed, see the [.addIgnoreFile](#addignorefilepath) section for details.
****
# Collaborators
- [@whitecolor](https://github.com/whitecolor) *Alex*
- [@SamyPesse](https://github.com/SamyPesse) *Samy Pessé*
- [@azproduction](https://github.com/azproduction) *Mikhail Davydov*
- [@TrySound](https://github.com/TrySound) *Bogdan Chadkin*
- [@JanMattner](https://github.com/JanMattner) *Jan Mattner*
- [@ntwb](https://github.com/ntwb) *Stephen Edgar*
- [@kasperisager](https://github.com/kasperisager) *Kasper Isager*
- [@sandersn](https://github.com/sandersn) *Nathan Shively-Sanders*