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sane
----
I've been driven to insanity by node filesystem watcher wrappers.
Sane aims to be fast, small, and reliable file system watcher. It does that by:
* By default stays away from fs polling because it's very slow and cpu intensive
* Uses `fs.watch` by default and sensibly works around the various issues
* Maintains a consistent API across different platforms
* Where `fs.watch` is not reliable you have the choice of using the following alternatives:
* [the facebook watchman library](https://facebook.github.io/watchman/)
* [the watchexec library](https://github.com/watchexec/watchexec)
* polling
## Install
```
$ npm install sane
```
## How to choose a mode
Don't worry too much about choosing the correct mode upfront because sane
maintains the same API across all modes and will be easy to switch.
* If you're only supporting Linux and OS X, `watchman` would be the most reliable mode
* If you're using node > v0.10.0 use the default mode
* If you're running OS X and you're watching a lot of directories and you're running into https://github.com/joyent/node/issues/5463, use `watchman`
* If you're in an environment where native file system events aren't available (like Vagrant), you should use polling
* Otherwise, the default mode should work well for you
## API
### sane(dir, options)
Watches a directory and all its descendant directories for changes, deletions, and additions on files and directories.
```js
var watcher = sane('path/to/dir', {glob: ['**/*.js', '**/*.css']});
watcher.on('ready', function () { console.log('ready') });
watcher.on('change', function (filepath, root, stat) { console.log('file changed', filepath); });
watcher.on('add', function (filepath, root, stat) { console.log('file added', filepath); });
watcher.on('delete', function (filepath, root) { console.log('file deleted', filepath); });
// close
watcher.close();
```
options:
* `glob`: a single string glob pattern or an array of them.
* `poll`: puts the watcher in polling mode. Under the hood that means `fs.watchFile`.
* `watchman`: makes the watcher use [watchman](https://facebook.github.io/watchman/).
* `watchmanPath`: sets a custom path for `watchman` binary.
* `watchexec`: makes the watcher use [watchexec](https://github.com/watchexec/watchexec).
* `dot`: enables watching files/directories that start with a dot.
* `ignored`: a glob, regex, function, or array of any combination.
For the glob pattern documentation, see [micromatch](https://github.com/micromatch/micromatch).
If you choose to use `watchman` you'll have to [install watchman yourself](https://facebook.github.io/watchman/docs/install.html)).
If you choose to use `watchexec` you'll have to [install watchexec yourself](https://github.com/watchexec/watchexec)).
For the ignored options, see [anymatch](https://github.com/es128/anymatch).
### sane.NodeWatcher(dir, options)
The default watcher class. Uses `fs.watch` under the hood, and takes the same options as `sane(dir, options)`.
### sane.WatchmanWatcher(dir, options)
The watchman watcher class. Takes the same options as `sane(dir, options)`.
### sane.Watchexec(dir, options)
The watchexec watcher class. Takes the same options as `sane(dir, options)`.
### sane.PollWatcher(dir, options)
The polling watcher class. Takes the same options as `sane(dir, options)` with the addition of:
* interval: indicates how often the files should be polled. (passed to fs.watchFile)
### sane.{Node|Watchman|Watchexec|Poll}Watcher#close
Stops watching.
### sane.{Node|Watchman|Watchexec|Poll}Watcher events
Emits the following events:
All events are passed the file/dir path relative to the root directory
* `ready` when the program is ready to detect events in the directory
* `change` when a file changes
* `add` when a file or directory has been added
* `delete` when a file or directory has been deleted
## CLI
This module includes a simple command line interface, which you can install with `npm install sane -g`.
```
Usage: sane <command> [...directory] [--glob=<filePattern>] [--poll] [--watchman] [--watchman-path=<watchmanBinaryPath>] [--dot] [--wait=<seconds>]
OPTIONS:
--glob=<filePattern>
A single string glob pattern or an array of them.
--ignored=<filePattern>
A glob, regex, function, or array of any combination.
--poll, -p
Use polling mode.
--watchman, -w
Use watchman (if available).
--watchman-path=<watchmanBinaryPath>
Sets a custom path for watchman binary (if using this mode).
--dot, -d
Enables watching files/directories that start with a dot.
--wait=<seconds>
Duration, in seconds, that watching will be disabled
after running <command>. Setting this option will
throttle calls to <command> for the specified duration.
--quiet, -q
Disables sane's console output
--changes-only, -o
Runs <command> only when a change occur. Skips running <command> at startup
```
It will watch the given `directory` and run the given <command> every time a file changes.
### CLI example usage
- `sane 'echo "A command ran"'`
- `sane 'echo "A command ran"' --glob='**/*.css'`
- `sane 'echo "A command ran"' site/assets/css --glob='**/*.css'`
- `sane 'echo "A command ran"' --glob='**/*.css' --ignored='**/ignore.css'`
- `sane 'echo "A command ran"' --wait=3`
- `sane 'echo "A command ran"' -p`
## License
MIT
## Credits
The CLI was originally based on the [watch CLI](https://github.com/mikeal/watch). Watch is licensed under the Apache License Version 2.0.