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https://github.com/shama/gaze

:crystal_ball: A globbing fs.watch wrapper built from the best parts of other fine watch libs.
https://github.com/shama/gaze

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:crystal_ball: A globbing fs.watch wrapper built from the best parts of other fine watch libs.

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# gaze [![Build Status](http://img.shields.io/travis/shama/gaze.svg)](https://travis-ci.org/shama/gaze) [![Build status](https://ci.appveyor.com/api/projects/status/vtx65w9eg511tgo4)](https://ci.appveyor.com/project/shama/gaze)



A globbing `fs.watch` wrapper built from the best parts of other fine watch libs.  

Compatible with Node.js >= 4.x, Windows, macOS, and Linux.



![gaze](http://dontkry.com/images/repos/gaze.png)



[![NPM](https://nodei.co/npm/gaze.png?downloads=true)](https://nodei.co/npm/gaze/)



## Usage

Install the module with: `npm install gaze` or place into your `package.json`

and run `npm install`.



```javascript

const gaze = require('gaze');



// Watch all .js files/dirs in process.cwd()

gaze('**/*.js', (err, watcher) => {

  // Files have all started watching



  // Get all watched files

  const watched = watcher.watched();



  // On file changed

  watcher.on('changed', filepath => {

    console.log(filepath + ' was changed');

  });



  // On file added

  watcher.on('added', filepath => {

    console.log(filepath + ' was added');

  });



  // On file deleted

  watcher.on('deleted', filepath => {

    console.log(filepath + ' was deleted');

  });



  // On changed/added/deleted

  watcher.on('all', (event, filepath) => {

    console.log(filepath + ' was ' + event);

  });



  // Get watched files with relative paths

  const files = watcher.relative();

});



// Also accepts an array of patterns

gaze(['stylesheets/*.css', 'images/**/*.png'], () => {

  // Add more patterns later to be watched

  watcher.add(['js/*.js']);

});

```



### Alternate Interface



```javascript

const {Gaze} = require('gaze');



const gaze = new Gaze('**/*');



// Files have all started watching

gaze.on('ready', watcher => { });



// A file has been added/changed/deleted has occurred

gaze.on('all', (event, filepath) => { });

```



### Errors



```javascript

gaze('**/*', (error, watcher) => {

  if (error) {

    // Handle error if it occurred while starting up

  }

});



// Or with the alternative interface

const gaze = new Gaze();

gaze.on('error', error => {

  // Handle error here

});

gaze.add('**/*');

```



### Minimatch / Glob



See [isaacs's `minimatch`](https://github.com/isaacs/minimatch) for more

information on glob patterns.



## Documentation



### gaze([patterns, options, callback])



* `patterns` {`String`|`Array`} File patterns to be matched

* `options` {`Object`}

* `callback` {`Function`}

  * `err` {`Error` | `null`}

  * `watcher` {`Object`} Instance of the `Gaze` watcher



### Class: `gaze.Gaze`



Create a `Gaze` object by instancing the `gaze.Gaze` class.



```javascript

const Gaze = require('gaze').Gaze;

const gaze = new Gaze(pattern, options, callback);

```



#### Properties



* `options` The options object passed in.

  * `interval` {integer} Interval to pass to `fs.watchFile`

  * `debounceDelay` {integer} Delay for events called in succession for the same

    file/event in milliseconds

  * `mode` {string} Force the watch mode. Either `'auto'` (default), `'watch'` (force native events), or `'poll'` (force stat polling).

  * `cwd` {string} The current working directory to base file patterns from. Default is `process.cwd()`.



#### Events



* `ready(watcher)` When files have been globbed and watching has begun.

* `all(event, filepath)` When an `added`, `changed`, `renamed`, or `deleted` event occurs.

* `added(filepath)` When a file has been added to a watch directory.

* `changed(filepath)` When a file has been changed.

* `deleted(filepath)` When a file has been deleted.

* `renamed(newPath, oldPath)` When a file has been renamed.

* `end()` When the watcher is closed and watches have been removed.

* `error(err)` When an error occurs.

* `nomatch` When no files have been matched.



#### Methods



* `emit(event, [...])` Wrapper for `EventEmitter.emit`.

  `added`|`changed`|`renamed`|`deleted` events will also trigger the `all` event.

* `close()` Unwatch all files and reset the watch instance.

* `add(patterns, callback)` Adds file(s) `patterns` to be watched.

* `remove(filepath)` Removes a file or directory from being watched. Does not

  recurse directories.

* `watched()` Returns the currently watched files.

* `relative([dir, unixify])` Returns the currently watched files with relative paths.

  * `dir` {string} Only return relative files for this directory.

  * `unixify` {boolean} Return paths with `/` instead of `\\` if on Windows.



## Similar Projects



Other great watch libraries to try are:



* [paulmillr's `chokidar`](https://github.com/paulmillr/chokidar)

* [amasad's `sane`](https://github.com/amasad/sane)

* [mikeal's `watch`](https://github.com/mikeal/watch)

* [github's `pathwatcher`](https://github.com/atom/node-pathwatcher)

* [bevry's `watchr`](https://github.com/bevry/watchr)



## Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style.

Add unit tests for any new or changed functionality. Lint and test your code

using [grunt](http://gruntjs.com/).



## Release History

* 1.1.3 - Fix for Node 10 support (@aredridel). Officially dropping support for Node < 4.

* 1.1.2 - Prevent more `ENOENT` errors from escaping (@alexgorbatchev).

* 1.1.1 - Prevent `fs.watch` errors from escaping error handler (@rosen-vladimirov). Fix `_addToWatched` without `path.sep` (@wyicwx).

* 1.1.0 - Update to `[email protected]` with `minimatch >= 3.0.0`.

* 1.0.0 - Revert back to 0.5.2. Drop support for Node.js v0.8. Fix for `maxListeners`. Update `globule` to `0.2.0`.

* 0.6.4 - Catch and emit `error` from `readdir` (@oconnore). Fix for `0 maxListeners`. Use `graceful-fs` to avoid `EMFILE` errors in other places `fs` is used. Better method to determine if `pathwatcher` was built. Fix keeping process alive too much, only init `pathwatcher` if a file is being watched. Set min required to Windows Vista when building on Windows (@pvolok).

* 0.6.3 - Add support for Node.js v0.11

* 0.6.2 - Fix argument error with `watched()`. Fix for erroneous `added` events on folders. Ignore `msvs` build error 4244.

* 0.6.1 - Fix for absolute paths.

* 0.6.0 - Uses native OS events (fork of `pathwatcher`) but can fall back to stat polling. Everything is async to avoid blocking, including `relative()` and `watched()`. Better error handling. Update to `[email protected]`. No longer watches `cwd` by default. Added `mode` option. Better `EMFILE` message. Avoids `ENOENT` errors with symlinks. All constructor arguments are optional.

* 0.5.2 - Fix for `ENOENT` error with non-existent symlinks [BACKPORTED].

* 0.5.1 - Use `setImmediate` (`process.nextTick` for Node.js v0.8) to defer `ready`/`nomatch` events (@amasad).

* 0.5.0 - Process is now kept alive while watching files. Emits a `nomatch` event when no files are matching.

* 0.4.3 - Track file additions in newly created folders (@brett-shwom).

* 0.4.2 - Fix `.remove()` method to remove a single file in a directory (@kaelzhang). Fixing “`Cannot call method 'call' of undefined`” (@krasimir). Track new file additions within folders (@brett-shwom).

* 0.4.1 - Fix `watchDir` not respecting close in race condition (@chrisirhc).

* 0.4.0 - Drop support for Node.js v0.6. Use `globule` for file matching. Avoid Node.js v0.10 `path.resolve`/`join` errors. Register new files when added to non-existent folder. Multiple instances can now poll the same files (@jpommerening).

* 0.3.4 - Code clean up. Fix “`path must be strings`” errors (@groner). Fix incorrect `added` events (@groner).

* 0.3.3 - Fix for multiple patterns with negate.

* 0.3.2 - Emit `end` before `removeAllListeners`.

* 0.3.1 - Fix `added` events within subfolder patterns.

* 0.3.0 - Handle safewrite events, `forceWatchMethod` option removed, bug fixes and watch optimizations (@rgaskill).

* 0.2.2 - Fix issue where subsequent `add` calls dont get watched (@samcday). `removeAllListeners` on `close`.

* 0.2.1 - Fix issue with invalid `added` events in current working dir.

* 0.2.0 - Support and mark folders with `path.sep`. Add `forceWatchMethod` option. Support `renamed` events.

* 0.1.6 - Recognize the `cwd` option properly

* 0.1.5 - Catch “`too many open file`” errors

* 0.1.4 - Really fix the race condition with 2 watches

* 0.1.3 - Fix race condition with 2 watches

* 0.1.2 - Read triggering changed event fix

* 0.1.1 - Minor fixes

* 0.1.0 - Initial release



## License

Copyright (c) 2018 Kyle Robinson Young  

Licensed under the MIT license.