127 lines
2.5 KiB
JavaScript
127 lines
2.5 KiB
JavaScript
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'use strict';
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var fs = require('fs');
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var path = require('path');
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var common = require('./common');
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var EventEmitter = require('events').EventEmitter;
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var fsevents;
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try {
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fsevents = require('fsevents');
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} catch (e) {
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// Ignore.
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}
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/**
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* Constants
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*/
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var CHANGE_EVENT = common.CHANGE_EVENT;
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var DELETE_EVENT = common.DELETE_EVENT;
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var ADD_EVENT = common.ADD_EVENT;
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var ALL_EVENT = common.ALL_EVENT;
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/**
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* Export `FSEventsWatcher` class.
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*/
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module.exports = FSEventsWatcher;
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/**
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* Watches `dir`.
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*
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* @class FSEventsWatcher
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* @param String dir
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* @param {Object} opts
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* @public
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*/
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function FSEventsWatcher(dir, opts) {
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if (!fsevents) {
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throw new Error(
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'`fsevents` unavailable (this watcher can only be used on Darwin)'
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);
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}
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common.assignOptions(this, opts);
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this.root = path.resolve(dir);
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this.watcher = fsevents(this.root);
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this.watcher.start().on('change', this.handleEvent.bind(this));
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this._tracked = Object.create(null);
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common.recReaddir(
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this.root,
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filepath => (this._tracked[filepath] = true),
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filepath => (this._tracked[filepath] = true),
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this.emit.bind(this, 'ready'),
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this.emit.bind(this, 'error'),
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this.ignored
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);
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}
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FSEventsWatcher.prototype.__proto__ = EventEmitter.prototype;
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FSEventsWatcher.prototype.handleEvent = function(filepath) {
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var relativePath = path.relative(this.root, filepath);
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if (
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!common.isFileIncluded(this.globs, this.dot, this.doIgnore, relativePath)
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) {
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return;
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}
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fs.lstat(
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filepath,
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function(error, stat) {
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if (error && error.code !== 'ENOENT') {
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this.emit('error', error);
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return;
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}
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if (error) {
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// Ignore files that aren't tracked and don't exist.
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if (!this._tracked[filepath]) {
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return;
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}
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this._emit(DELETE_EVENT, relativePath);
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delete this._tracked[filepath];
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return;
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}
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if (this._tracked[filepath]) {
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this._emit(CHANGE_EVENT, relativePath, stat);
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} else {
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this._tracked[filepath] = true;
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this._emit(ADD_EVENT, relativePath, stat);
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}
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}.bind(this)
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);
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};
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/**
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* End watching.
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*
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* @public
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*/
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FSEventsWatcher.prototype.close = function(callback) {
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this.watcher.stop();
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this.removeAllListeners();
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if (typeof callback === 'function') {
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process.nextTick(callback.bind(null, null, true));
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}
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};
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/**
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* Emit events.
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*
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* @private
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*/
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FSEventsWatcher.prototype._emit = function(type, file, stat) {
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this.emit(type, file, this.root, stat);
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this.emit(ALL_EVENT, type, file, this.root, stat);
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};
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