'use strict';
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var EventEmitter = require('events').EventEmitter;
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var fs = require('fs');
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var sysPath = require('path');
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var asyncEach = require('async-each');
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var anymatch = require('anymatch');
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var globParent = require('glob-parent');
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var isGlob = require('is-glob');
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var isAbsolute = require('path-is-absolute');
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var inherits = require('inherits');
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var braces = require('braces');
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var normalizePath = require('normalize-path');
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var upath = require('upath');
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var NodeFsHandler = require('./lib/nodefs-handler');
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var FsEventsHandler = require('./lib/fsevents-handler');
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var arrify = function(value) {
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if (value == null) return [];
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return Array.isArray(value) ? value : [value];
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};
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var flatten = function(list, result) {
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if (result == null) result = [];
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list.forEach(function(item) {
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if (Array.isArray(item)) {
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flatten(item, result);
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} else {
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result.push(item);
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}
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});
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return result;
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};
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// Little isString util for use in Array#every.
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var isString = function(thing) {
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return typeof thing === 'string';
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};
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// Public: Main class.
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// Watches files & directories for changes.
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//
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// * _opts - object, chokidar options hash
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//
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// Emitted events:
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// `add`, `addDir`, `change`, `unlink`, `unlinkDir`, `all`, `error`
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//
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// Examples
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//
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// var watcher = new FSWatcher()
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// .add(directories)
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// .on('add', path => console.log('File', path, 'was added'))
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// .on('change', path => console.log('File', path, 'was changed'))
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// .on('unlink', path => console.log('File', path, 'was removed'))
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// .on('all', (event, path) => console.log(path, ' emitted ', event))
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//
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function FSWatcher(_opts) {
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EventEmitter.call(this);
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var opts = {};
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// in case _opts that is passed in is a frozen object
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if (_opts) for (var opt in _opts) opts[opt] = _opts[opt];
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this._watched = Object.create(null);
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this._closers = Object.create(null);
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this._ignoredPaths = Object.create(null);
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Object.defineProperty(this, '_globIgnored', {
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get: function() { return Object.keys(this._ignoredPaths); }
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});
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this.closed = false;
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this._throttled = Object.create(null);
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this._symlinkPaths = Object.create(null);
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function undef(key) {
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return opts[key] === undefined;
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}
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// Set up default options.
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if (undef('persistent')) opts.persistent = true;
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if (undef('ignoreInitial')) opts.ignoreInitial = false;
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if (undef('ignorePermissionErrors')) opts.ignorePermissionErrors = false;
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if (undef('interval')) opts.interval = 100;
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if (undef('binaryInterval')) opts.binaryInterval = 300;
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if (undef('disableGlobbing')) opts.disableGlobbing = false;
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this.enableBinaryInterval = opts.binaryInterval !== opts.interval;
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// Enable fsevents on OS X when polling isn't explicitly enabled.
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if (undef('useFsEvents')) opts.useFsEvents = !opts.usePolling;
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// If we can't use fsevents, ensure the options reflect it's disabled.
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if (!FsEventsHandler.canUse()) opts.useFsEvents = false;
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// Use polling on Mac if not using fsevents.
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// Other platforms use non-polling fs.watch.
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if (undef('usePolling') && !opts.useFsEvents) {
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opts.usePolling = process.platform === 'darwin';
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}
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// Global override (useful for end-developers that need to force polling for all
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// instances of chokidar, regardless of usage/dependency depth)
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var envPoll = process.env.CHOKIDAR_USEPOLLING;
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if (envPoll !== undefined) {
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var envLower = envPoll.toLowerCase();
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if (envLower === 'false' || envLower === '0') {
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opts.usePolling = false;
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} else if (envLower === 'true' || envLower === '1') {
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opts.usePolling = true;
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} else {
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opts.usePolling = !!envLower
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}
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}
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var envInterval = process.env.CHOKIDAR_INTERVAL;
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if (envInterval) {
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opts.interval = parseInt(envInterval);
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}
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// Editor atomic write normalization enabled by default with fs.watch
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if (undef('atomic')) opts.atomic = !opts.usePolling && !opts.useFsEvents;
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if (opts.atomic) this._pendingUnlinks = Object.create(null);
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if (undef('followSymlinks')) opts.followSymlinks = true;
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if (undef('awaitWriteFinish')) opts.awaitWriteFinish = false;
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if (opts.awaitWriteFinish === true) opts.awaitWriteFinish = {};
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var awf = opts.awaitWriteFinish;
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if (awf) {
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if (!awf.stabilityThreshold) awf.stabilityThreshold = 2000;
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if (!awf.pollInterval) awf.pollInterval = 100;
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this._pendingWrites = Object.create(null);
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}
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if (opts.ignored) opts.ignored = arrify(opts.ignored);
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this._isntIgnored = function(path, stat) {
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return !this._isIgnored(path, stat);
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}.bind(this);
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var readyCalls = 0;
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this._emitReady = function() {
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if (++readyCalls >= this._readyCount) {
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this._emitReady = Function.prototype;
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this._readyEmitted = true;
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// use process.nextTick to allow time for listener to be bound
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process.nextTick(this.emit.bind(this, 'ready'));
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}
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}.bind(this);
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this.options = opts;
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// You’re frozen when your heart’s not open.
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Object.freeze(opts);
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}
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inherits(FSWatcher, EventEmitter);
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// Common helpers
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// --------------
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// Private method: Normalize and emit events
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//
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// * event - string, type of event
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// * path - string, file or directory path
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// * val[1..3] - arguments to be passed with event
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//
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// Returns the error if defined, otherwise the value of the
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// FSWatcher instance's `closed` flag
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FSWatcher.prototype._emit = function(event, path, val1, val2, val3) {
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if (this.options.cwd) path = sysPath.relative(this.options.cwd, path);
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var args = [event, path];
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if (val3 !== undefined) args.push(val1, val2, val3);
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else if (val2 !== undefined) args.push(val1, val2);
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else if (val1 !== undefined) args.push(val1);
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var awf = this.options.awaitWriteFinish;
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if (awf && this._pendingWrites[path]) {
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this._pendingWrites[path].lastChange = new Date();
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return this;
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}
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if (this.options.atomic) {
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if (event === 'unlink') {
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this._pendingUnlinks[path] = args;
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setTimeout(function() {
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Object.keys(this._pendingUnlinks).forEach(function(path) {
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this.emit.apply(this, this._pendingUnlinks[path]);
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this.emit.apply(this, ['all'].concat(this._pendingUnlinks[path]));
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delete this._pendingUnlinks[path];
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}.bind(this));
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}.bind(this), typeof this.options.atomic === "number"
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? this.options.atomic
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: 100);
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return this;
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} else if (event === 'add' && this._pendingUnlinks[path]) {
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event = args[0] = 'change';
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delete this._pendingUnlinks[path];
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}
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}
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var emitEvent = function() {
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this.emit.apply(this, args);
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if (event !== 'error') this.emit.apply(this, ['all'].concat(args));
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}.bind(this);
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if (awf && (event === 'add' || event === 'change') && this._readyEmitted) {
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var awfEmit = function(err, stats) {
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if (err) {
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event = args[0] = 'error';
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args[1] = err;
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emitEvent();
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} else if (stats) {
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// if stats doesn't exist the file must have been deleted
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if (args.length > 2) {
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args[2] = stats;
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} else {
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args.push(stats);
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}
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emitEvent();
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}
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};
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this._awaitWriteFinish(path, awf.stabilityThreshold, event, awfEmit);
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return this;
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}
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if (event === 'change') {
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if (!this._throttle('change', path, 50)) return this;
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}
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if (
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this.options.alwaysStat && val1 === undefined &&
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(event === 'add' || event === 'addDir' || event === 'change')
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) {
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var fullPath = this.options.cwd ? sysPath.join(this.options.cwd, path) : path;
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fs.stat(fullPath, function(error, stats) {
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// Suppress event when fs.stat fails, to avoid sending undefined 'stat'
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if (error || !stats) return;
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args.push(stats);
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emitEvent();
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});
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} else {
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emitEvent();
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}
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return this;
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};
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// Private method: Common handler for errors
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//
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// * error - object, Error instance
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//
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// Returns the error if defined, otherwise the value of the
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// FSWatcher instance's `closed` flag
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FSWatcher.prototype._handleError = function(error) {
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var code = error && error.code;
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var ipe = this.options.ignorePermissionErrors;
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if (error &&
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code !== 'ENOENT' &&
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code !== 'ENOTDIR' &&
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(!ipe || (code !== 'EPERM' && code !== 'EACCES'))
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) this.emit('error', error);
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return error || this.closed;
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};
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// Private method: Helper utility for throttling
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//
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// * action - string, type of action being throttled
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// * path - string, path being acted upon
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// * timeout - int, duration of time to suppress duplicate actions
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//
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// Returns throttle tracking object or false if action should be suppressed
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FSWatcher.prototype._throttle = function(action, path, timeout) {
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if (!(action in this._throttled)) {
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this._throttled[action] = Object.create(null);
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}
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var throttled = this._throttled[action];
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if (path in throttled) {
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throttled[path].count++;
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return false;
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}
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function clear() {
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var count = throttled[path] ? throttled[path].count : 0;
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delete throttled[path];
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clearTimeout(timeoutObject);
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return count;
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}
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var timeoutObject = setTimeout(clear, timeout);
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throttled[path] = {timeoutObject: timeoutObject, clear: clear, count: 0};
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return throttled[path];
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};
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// Private method: Awaits write operation to finish
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//
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// * path - string, path being acted upon
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// * threshold - int, time in milliseconds a file size must be fixed before
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// acknowledging write operation is finished
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// * awfEmit - function, to be called when ready for event to be emitted
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// Polls a newly created file for size variations. When files size does not
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// change for 'threshold' milliseconds calls callback.
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FSWatcher.prototype._awaitWriteFinish = function(path, threshold, event, awfEmit) {
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var timeoutHandler;
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var fullPath = path;
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if (this.options.cwd && !isAbsolute(path)) {
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fullPath = sysPath.join(this.options.cwd, path);
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}
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var now = new Date();
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var awaitWriteFinish = (function (prevStat) {
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fs.stat(fullPath, function(err, curStat) {
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if (err || !(path in this._pendingWrites)) {
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if (err && err.code !== 'ENOENT') awfEmit(err);
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return;
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}
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var now = new Date();
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if (prevStat && curStat.size != prevStat.size) {
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this._pendingWrites[path].lastChange = now;
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}
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if (now - this._pendingWrites[path].lastChange >= threshold) {
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delete this._pendingWrites[path];
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awfEmit(null, curStat);
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} else {
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timeoutHandler = setTimeout(
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awaitWriteFinish.bind(this, curStat),
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this.options.awaitWriteFinish.pollInterval
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);
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}
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}.bind(this));
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}.bind(this));
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if (!(path in this._pendingWrites)) {
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this._pendingWrites[path] = {
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lastChange: now,
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cancelWait: function() {
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delete this._pendingWrites[path];
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clearTimeout(timeoutHandler);
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return event;
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}.bind(this)
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};
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timeoutHandler = setTimeout(
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awaitWriteFinish.bind(this),
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this.options.awaitWriteFinish.pollInterval
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);
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}
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};
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// Private method: Determines whether user has asked to ignore this path
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//
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// * path - string, path to file or directory
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// * stats - object, result of fs.stat
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//
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// Returns boolean
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var dotRe = /\..*\.(sw[px])$|\~$|\.subl.*\.tmp/;
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FSWatcher.prototype._isIgnored = function(path, stats) {
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if (this.options.atomic && dotRe.test(path)) return true;
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if (!this._userIgnored) {
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var cwd = this.options.cwd;
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var ignored = this.options.ignored;
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if (cwd && ignored) {
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ignored = ignored.map(function (path) {
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if (typeof path !== 'string') return path;
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return upath.normalize(isAbsolute(path) ? path : sysPath.join(cwd, path));
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});
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}
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var paths = arrify(ignored)
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.filter(function(path) {
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return typeof path === 'string' && !isGlob(path);
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}).map(function(path) {
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return path + '/**';
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});
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this._userIgnored = anymatch(
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this._globIgnored.concat(ignored).concat(paths)
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);
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}
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return this._userIgnored([path, stats]);
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};
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// Private method: Provides a set of common helpers and properties relating to
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// symlink and glob handling
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//
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// * path - string, file, directory, or glob pattern being watched
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// * depth - int, at any depth > 0, this isn't a glob
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//
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// Returns object containing helpers for this path
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var replacerRe = /^\.[\/\\]/;
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FSWatcher.prototype._getWatchHelpers = function(path, depth) {
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path = path.replace(replacerRe, '');
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var watchPath = depth || this.options.disableGlobbing || !isGlob(path) ? path : globParent(path);
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var fullWatchPath = sysPath.resolve(watchPath);
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var hasGlob = watchPath !== path;
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var globFilter = hasGlob ? anymatch(path) : false;
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var follow = this.options.followSymlinks;
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var globSymlink = hasGlob && follow ? null : false;
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var checkGlobSymlink = function(entry) {
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// only need to resolve once
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// first entry should always have entry.parentDir === ''
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if (globSymlink == null) {
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globSymlink = entry.fullParentDir === fullWatchPath ? false : {
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realPath: entry.fullParentDir,
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linkPath: fullWatchPath
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};
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}
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if (globSymlink) {
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return entry.fullPath.replace(globSymlink.realPath, globSymlink.linkPath);
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}
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return entry.fullPath;
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};
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var entryPath = function(entry) {
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return sysPath.join(watchPath,
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sysPath.relative(watchPath, checkGlobSymlink(entry))
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);
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};
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var filterPath = function(entry) {
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if (entry.stat && entry.stat.isSymbolicLink()) return filterDir(entry);
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var resolvedPath = entryPath(entry);
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return (!hasGlob || globFilter(resolvedPath)) &&
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this._isntIgnored(resolvedPath, entry.stat) &&
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(this.options.ignorePermissionErrors ||
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this._hasReadPermissions(entry.stat));
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}.bind(this);
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var getDirParts = function(path) {
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if (!hasGlob) return false;
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var parts = [];
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var expandedPath = braces.expand(path);
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expandedPath.forEach(function(path) {
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parts.push(sysPath.relative(watchPath, path).split(/[\/\\]/));
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});
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return parts;
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};
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var dirParts = getDirParts(path);
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if (dirParts) {
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dirParts.forEach(function(parts) {
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if (parts.length > 1) parts.pop();
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});
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}
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var unmatchedGlob;
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var filterDir = function(entry) {
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if (hasGlob) {
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var entryParts = getDirParts(checkGlobSymlink(entry));
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var globstar = false;
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unmatchedGlob = !dirParts.some(function(parts) {
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return parts.every(function(part, i) {
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if (part === '**') globstar = true;
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return globstar || !entryParts[0][i] || anymatch(part, entryParts[0][i]);
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});
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});
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}
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return !unmatchedGlob && this._isntIgnored(entryPath(entry), entry.stat);
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}.bind(this);
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return {
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followSymlinks: follow,
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statMethod: follow ? 'stat' : 'lstat',
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path: path,
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watchPath: watchPath,
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entryPath: entryPath,
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hasGlob: hasGlob,
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globFilter: globFilter,
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filterPath: filterPath,
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filterDir: filterDir
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};
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};
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// Directory helpers
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// -----------------
|
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// Private method: Provides directory tracking objects
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//
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// * directory - string, path of the directory
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//
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// Returns the directory's tracking object
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FSWatcher.prototype._getWatchedDir = function(directory) {
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var dir = sysPath.resolve(directory);
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var watcherRemove = this._remove.bind(this);
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if (!(dir in this._watched)) this._watched[dir] = {
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_items: Object.create(null),
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add: function(item) {
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if (item !== '.' && item !== '..') this._items[item] = true;
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},
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remove: function(item) {
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delete this._items[item];
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if (!this.children().length) {
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fs.readdir(dir, function(err) {
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if (err) watcherRemove(sysPath.dirname(dir), sysPath.basename(dir));
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});
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}
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},
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has: function(item) {return item in this._items;},
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children: function() {return Object.keys(this._items);}
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};
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return this._watched[dir];
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};
|
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// File helpers
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// ------------
|
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// Private method: Check for read permissions
|
// Based on this answer on SO: http://stackoverflow.com/a/11781404/1358405
|
//
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// * stats - object, result of fs.stat
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//
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// Returns boolean
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FSWatcher.prototype._hasReadPermissions = function(stats) {
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return Boolean(4 & parseInt(((stats && stats.mode) & 0x1ff).toString(8)[0], 10));
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};
|
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// Private method: Handles emitting unlink events for
|
// files and directories, and via recursion, for
|
// files and directories within directories that are unlinked
|
//
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// * directory - string, directory within which the following item is located
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// * item - string, base path of item/directory
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//
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// Returns nothing
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FSWatcher.prototype._remove = function(directory, item) {
|
// if what is being deleted is a directory, get that directory's paths
|
// for recursive deleting and cleaning of watched object
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// if it is not a directory, nestedDirectoryChildren will be empty array
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var path = sysPath.join(directory, item);
|
var fullPath = sysPath.resolve(path);
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var isDirectory = this._watched[path] || this._watched[fullPath];
|
|
// prevent duplicate handling in case of arriving here nearly simultaneously
|
// via multiple paths (such as _handleFile and _handleDir)
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if (!this._throttle('remove', path, 100)) return;
|
|
// if the only watched file is removed, watch for its return
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var watchedDirs = Object.keys(this._watched);
|
if (!isDirectory && !this.options.useFsEvents && watchedDirs.length === 1) {
|
this.add(directory, item, true);
|
}
|
|
// This will create a new entry in the watched object in either case
|
// so we got to do the directory check beforehand
|
var nestedDirectoryChildren = this._getWatchedDir(path).children();
|
|
// Recursively remove children directories / files.
|
nestedDirectoryChildren.forEach(function(nestedItem) {
|
this._remove(path, nestedItem);
|
}, this);
|
|
// Check if item was on the watched list and remove it
|
var parent = this._getWatchedDir(directory);
|
var wasTracked = parent.has(item);
|
parent.remove(item);
|
|
// If we wait for this file to be fully written, cancel the wait.
|
var relPath = path;
|
if (this.options.cwd) relPath = sysPath.relative(this.options.cwd, path);
|
if (this.options.awaitWriteFinish && this._pendingWrites[relPath]) {
|
var event = this._pendingWrites[relPath].cancelWait();
|
if (event === 'add') return;
|
}
|
|
// The Entry will either be a directory that just got removed
|
// or a bogus entry to a file, in either case we have to remove it
|
delete this._watched[path];
|
delete this._watched[fullPath];
|
var eventName = isDirectory ? 'unlinkDir' : 'unlink';
|
if (wasTracked && !this._isIgnored(path)) this._emit(eventName, path);
|
|
// Avoid conflicts if we later create another file with the same name
|
if (!this.options.useFsEvents) {
|
this._closePath(path);
|
}
|
};
|
|
FSWatcher.prototype._closePath = function(path) {
|
if (!this._closers[path]) return;
|
this._closers[path].forEach(function(closer) {
|
closer();
|
});
|
delete this._closers[path];
|
this._getWatchedDir(sysPath.dirname(path)).remove(sysPath.basename(path));
|
}
|
|
// Public method: Adds paths to be watched on an existing FSWatcher instance
|
|
// * paths - string or array of strings, file/directory paths and/or globs
|
// * _origAdd - private boolean, for handling non-existent paths to be watched
|
// * _internal - private boolean, indicates a non-user add
|
|
// Returns an instance of FSWatcher for chaining.
|
FSWatcher.prototype.add = function(paths, _origAdd, _internal) {
|
var disableGlobbing = this.options.disableGlobbing;
|
var cwd = this.options.cwd;
|
this.closed = false;
|
paths = flatten(arrify(paths));
|
|
if (!paths.every(isString)) {
|
throw new TypeError('Non-string provided as watch path: ' + paths);
|
}
|
|
if (cwd) paths = paths.map(function(path) {
|
var absPath;
|
if (isAbsolute(path)) {
|
absPath = path;
|
} else if (path[0] === '!') {
|
absPath = '!' + sysPath.join(cwd, path.substring(1));
|
} else {
|
absPath = sysPath.join(cwd, path);
|
}
|
|
// Check `path` instead of `absPath` because the cwd portion can't be a glob
|
if (disableGlobbing || !isGlob(path)) {
|
return absPath;
|
} else {
|
return normalizePath(absPath);
|
}
|
});
|
|
// set aside negated glob strings
|
paths = paths.filter(function(path) {
|
if (path[0] === '!') {
|
this._ignoredPaths[path.substring(1)] = true;
|
} else {
|
// if a path is being added that was previously ignored, stop ignoring it
|
delete this._ignoredPaths[path];
|
delete this._ignoredPaths[path + '/**'];
|
|
// reset the cached userIgnored anymatch fn
|
// to make ignoredPaths changes effective
|
this._userIgnored = null;
|
|
return true;
|
}
|
}, this);
|
|
if (this.options.useFsEvents && FsEventsHandler.canUse()) {
|
if (!this._readyCount) this._readyCount = paths.length;
|
if (this.options.persistent) this._readyCount *= 2;
|
paths.forEach(this._addToFsEvents, this);
|
} else {
|
if (!this._readyCount) this._readyCount = 0;
|
this._readyCount += paths.length;
|
asyncEach(paths, function(path, next) {
|
this._addToNodeFs(path, !_internal, 0, 0, _origAdd, function(err, res) {
|
if (res) this._emitReady();
|
next(err, res);
|
}.bind(this));
|
}.bind(this), function(error, results) {
|
results.forEach(function(item) {
|
if (!item || this.closed) return;
|
this.add(sysPath.dirname(item), sysPath.basename(_origAdd || item));
|
}, this);
|
}.bind(this));
|
}
|
|
return this;
|
};
|
|
// Public method: Close watchers or start ignoring events from specified paths.
|
|
// * paths - string or array of strings, file/directory paths and/or globs
|
|
// Returns instance of FSWatcher for chaining.
|
FSWatcher.prototype.unwatch = function(paths) {
|
if (this.closed) return this;
|
paths = flatten(arrify(paths));
|
|
paths.forEach(function(path) {
|
// convert to absolute path unless relative path already matches
|
if (!isAbsolute(path) && !this._closers[path]) {
|
if (this.options.cwd) path = sysPath.join(this.options.cwd, path);
|
path = sysPath.resolve(path);
|
}
|
|
this._closePath(path);
|
|
this._ignoredPaths[path] = true;
|
if (path in this._watched) {
|
this._ignoredPaths[path + '/**'] = true;
|
}
|
|
// reset the cached userIgnored anymatch fn
|
// to make ignoredPaths changes effective
|
this._userIgnored = null;
|
}, this);
|
|
return this;
|
};
|
|
// Public method: Close watchers and remove all listeners from watched paths.
|
|
// Returns instance of FSWatcher for chaining.
|
FSWatcher.prototype.close = function() {
|
if (this.closed) return this;
|
|
this.closed = true;
|
Object.keys(this._closers).forEach(function(watchPath) {
|
this._closers[watchPath].forEach(function(closer) {
|
closer();
|
});
|
delete this._closers[watchPath];
|
}, this);
|
this._watched = Object.create(null);
|
|
this.removeAllListeners();
|
return this;
|
};
|
|
// Public method: Expose list of watched paths
|
|
// Returns object w/ dir paths as keys and arrays of contained paths as values.
|
FSWatcher.prototype.getWatched = function() {
|
var watchList = {};
|
Object.keys(this._watched).forEach(function(dir) {
|
var key = this.options.cwd ? sysPath.relative(this.options.cwd, dir) : dir;
|
watchList[key || '.'] = Object.keys(this._watched[dir]._items).sort();
|
}.bind(this));
|
return watchList;
|
};
|
|
// Attach watch handler prototype methods
|
function importHandler(handler) {
|
Object.keys(handler.prototype).forEach(function(method) {
|
FSWatcher.prototype[method] = handler.prototype[method];
|
});
|
}
|
importHandler(NodeFsHandler);
|
if (FsEventsHandler.canUse()) importHandler(FsEventsHandler);
|
|
// Export FSWatcher class
|
exports.FSWatcher = FSWatcher;
|
|
// Public function: Instantiates watcher with paths to be tracked.
|
|
// * paths - string or array of strings, file/directory paths and/or globs
|
// * options - object, chokidar options
|
|
// Returns an instance of FSWatcher for chaining.
|
exports.watch = function(paths, options) {
|
return new FSWatcher(options).add(paths);
|
};
|
