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JavaScript

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'use strict';
var EventEmitter = require('events').EventEmitter;
var fs = require('fs');
var sysPath = require('path');
var asyncEach = require('async-each');
var anymatch = require('anymatch');
var globParent = require('glob-parent');
var isGlob = require('is-glob');
var isAbsolute = require('path-is-absolute');
var inherits = require('inherits');
var NodeFsHandler = require('./lib/nodefs-handler');
var FsEventsHandler = require('./lib/fsevents-handler');
var arrify = function(value) {
if (value == null) return [];
return Array.isArray(value) ? value : [value];
};
var flatten = function(list, result) {
if (result == null) result = [];
list.forEach(function(item) {
if (Array.isArray(item)) {
flatten(item, result);
} else {
result.push(item);
}
});
return result;
};
// Little isString util for use in Array#every.
var isString = function(thing) {
return typeof thing === 'string';
};
// Public: Main class.
// Watches files & directories for changes.
//
// * _opts - object, chokidar options hash
//
// Emitted events:
// `add`, `addDir`, `change`, `unlink`, `unlinkDir`, `all`, `error`
//
// Examples
//
// var watcher = new FSWatcher()
// .add(directories)
// .on('add', path => console.log('File', path, 'was added'))
// .on('change', path => console.log('File', path, 'was changed'))
// .on('unlink', path => console.log('File', path, 'was removed'))
// .on('all', (event, path) => console.log(path, ' emitted ', event))
//
function FSWatcher(_opts) {
EventEmitter.call(this);
var opts = {};
// in case _opts that is passed in is a frozen object
if (_opts) for (var opt in _opts) opts[opt] = _opts[opt];
this._watched = Object.create(null);
this._closers = Object.create(null);
this._ignoredPaths = Object.create(null);
Object.defineProperty(this, '_globIgnored', {
get: function() { return Object.keys(this._ignoredPaths); }
});
this.closed = false;
this._throttled = Object.create(null);
this._symlinkPaths = Object.create(null);
function undef(key) {
return opts[key] === undefined;
}
// Set up default options.
if (undef('persistent')) opts.persistent = true;
if (undef('ignoreInitial')) opts.ignoreInitial = false;
if (undef('ignorePermissionErrors')) opts.ignorePermissionErrors = false;
if (undef('interval')) opts.interval = 100;
if (undef('binaryInterval')) opts.binaryInterval = 300;
if (undef('disableGlobbing')) opts.disableGlobbing = false;
this.enableBinaryInterval = opts.binaryInterval !== opts.interval;
// Enable fsevents on OS X when polling isn't explicitly enabled.
if (undef('useFsEvents')) opts.useFsEvents = !opts.usePolling;
// If we can't use fsevents, ensure the options reflect it's disabled.
if (!FsEventsHandler.canUse()) opts.useFsEvents = false;
// Use polling on Mac if not using fsevents.
// Other platforms use non-polling fs.watch.
if (undef('usePolling') && !opts.useFsEvents) {
opts.usePolling = process.platform === 'darwin';
}
// Global override (useful for end-developers that need to force polling for all
// instances of chokidar, regardless of usage/dependency depth)
var envPoll = process.env.CHOKIDAR_USEPOLLING;
if (envPoll !== undefined) {
var envLower = envPoll.toLowerCase();
if (envLower === 'false' || envLower === '0') {
opts.usePolling = false;
} else if (envLower === 'true' || envLower === '1') {
opts.usePolling = true;
} else {
opts.usePolling = !!envLower
}
}
var envInterval = process.env.CHOKIDAR_INTERVAL;
if (envInterval) {
opts.interval = parseInt(envInterval);
}
// Editor atomic write normalization enabled by default with fs.watch
if (undef('atomic')) opts.atomic = !opts.usePolling && !opts.useFsEvents;
if (opts.atomic) this._pendingUnlinks = Object.create(null);
if (undef('followSymlinks')) opts.followSymlinks = true;
if (undef('awaitWriteFinish')) opts.awaitWriteFinish = false;
if (opts.awaitWriteFinish === true) opts.awaitWriteFinish = {};
var awf = opts.awaitWriteFinish;
if (awf) {
if (!awf.stabilityThreshold) awf.stabilityThreshold = 2000;
if (!awf.pollInterval) awf.pollInterval = 100;
this._pendingWrites = Object.create(null);
}
if (opts.ignored) opts.ignored = arrify(opts.ignored);
this._isntIgnored = function(path, stat) {
return !this._isIgnored(path, stat);
}.bind(this);
var readyCalls = 0;
this._emitReady = function() {
if (++readyCalls >= this._readyCount) {
this._emitReady = Function.prototype;
this._readyEmitted = true;
// use process.nextTick to allow time for listener to be bound
process.nextTick(this.emit.bind(this, 'ready'));
}
}.bind(this);
this.options = opts;
// Youre frozen when your hearts not open.
Object.freeze(opts);
}
inherits(FSWatcher, EventEmitter);
// Common helpers
// --------------
// Private method: Normalize and emit events
//
// * event - string, type of event
// * path - string, file or directory path
// * val[1..3] - arguments to be passed with event
//
// Returns the error if defined, otherwise the value of the
// FSWatcher instance's `closed` flag
FSWatcher.prototype._emit = function(event, path, val1, val2, val3) {
if (this.options.cwd) path = sysPath.relative(this.options.cwd, path);
var args = [event, path];
if (val3 !== undefined) args.push(val1, val2, val3);
else if (val2 !== undefined) args.push(val1, val2);
else if (val1 !== undefined) args.push(val1);
var awf = this.options.awaitWriteFinish;
if (awf && this._pendingWrites[path]) {
this._pendingWrites[path].lastChange = new Date();
return this;
}
if (this.options.atomic) {
if (event === 'unlink') {
this._pendingUnlinks[path] = args;
setTimeout(function() {
Object.keys(this._pendingUnlinks).forEach(function(path) {
this.emit.apply(this, this._pendingUnlinks[path]);
this.emit.apply(this, ['all'].concat(this._pendingUnlinks[path]));
delete this._pendingUnlinks[path];
}.bind(this));
}.bind(this), typeof this.options.atomic === "number"
? this.options.atomic
: 100);
return this;
} else if (event === 'add' && this._pendingUnlinks[path]) {
event = args[0] = 'change';
delete this._pendingUnlinks[path];
}
}
var emitEvent = function() {
this.emit.apply(this, args);
if (event !== 'error') this.emit.apply(this, ['all'].concat(args));
}.bind(this);
if (awf && (event === 'add' || event === 'change') && this._readyEmitted) {
var awfEmit = function(err, stats) {
if (err) {
event = args[0] = 'error';
args[1] = err;
emitEvent();
} else if (stats) {
// if stats doesn't exist the file must have been deleted
if (args.length > 2) {
args[2] = stats;
} else {
args.push(stats);
}
emitEvent();
}
};
this._awaitWriteFinish(path, awf.stabilityThreshold, event, awfEmit);
return this;
}
if (event === 'change') {
if (!this._throttle('change', path, 50)) return this;
}
if (
this.options.alwaysStat && val1 === undefined &&
(event === 'add' || event === 'addDir' || event === 'change')
) {
var fullPath = this.options.cwd ? sysPath.join(this.options.cwd, path) : path;
fs.stat(fullPath, function(error, stats) {
// Suppress event when fs.stat fails, to avoid sending undefined 'stat'
if (error || !stats) return;
args.push(stats);
emitEvent();
});
} else {
emitEvent();
}
return this;
};
// Private method: Common handler for errors
//
// * error - object, Error instance
//
// Returns the error if defined, otherwise the value of the
// FSWatcher instance's `closed` flag
FSWatcher.prototype._handleError = function(error) {
var code = error && error.code;
var ipe = this.options.ignorePermissionErrors;
if (error &&
code !== 'ENOENT' &&
code !== 'ENOTDIR' &&
(!ipe || (code !== 'EPERM' && code !== 'EACCES'))
) this.emit('error', error);
return error || this.closed;
};
// Private method: Helper utility for throttling
//
// * action - string, type of action being throttled
// * path - string, path being acted upon
// * timeout - int, duration of time to suppress duplicate actions
//
// Returns throttle tracking object or false if action should be suppressed
FSWatcher.prototype._throttle = function(action, path, timeout) {
if (!(action in this._throttled)) {
this._throttled[action] = Object.create(null);
}
var throttled = this._throttled[action];
if (path in throttled) return false;
function clear() {
delete throttled[path];
clearTimeout(timeoutObject);
}
var timeoutObject = setTimeout(clear, timeout);
throttled[path] = {timeoutObject: timeoutObject, clear: clear};
return throttled[path];
};
// Private method: Awaits write operation to finish
//
// * path - string, path being acted upon
// * threshold - int, time in milliseconds a file size must be fixed before
// acknowledgeing write operation is finished
// * awfEmit - function, to be called when ready for event to be emitted
// Polls a newly created file for size variations. When files size does not
// change for 'threshold' milliseconds calls callback.
FSWatcher.prototype._awaitWriteFinish = function(path, threshold, event, awfEmit) {
var timeoutHandler;
var fullPath = path;
if (this.options.cwd && !isAbsolute(path)) {
fullPath = sysPath.join(this.options.cwd, path);
}
var now = new Date();
var awaitWriteFinish = (function (prevStat) {
fs.stat(fullPath, function(err, curStat) {
if (err) {
if (err.code !== 'ENOENT') awfEmit(err);
return;
}
var now = new Date();
if (prevStat && curStat.size != prevStat.size) {
this._pendingWrites[path].lastChange = now;
}
if (now - this._pendingWrites[path].lastChange >= threshold) {
delete this._pendingWrites[path];
awfEmit(null, curStat);
} else {
timeoutHandler = setTimeout(
awaitWriteFinish.bind(this, curStat),
this.options.awaitWriteFinish.pollInterval
);
}
}.bind(this));
}.bind(this));
if (!(path in this._pendingWrites)) {
this._pendingWrites[path] = {
lastChange: now,
cancelWait: function() {
delete this._pendingWrites[path];
clearTimeout(timeoutHandler);
return event;
}.bind(this)
};
timeoutHandler = setTimeout(
awaitWriteFinish.bind(this),
this.options.awaitWriteFinish.pollInterval
);
}
};
// Private method: Determines whether user has asked to ignore this path
//
// * path - string, path to file or directory
// * stats - object, result of fs.stat
//
// Returns boolean
var dotRe = /\..*\.(sw[px])$|\~$|\.subl.*\.tmp/;
FSWatcher.prototype._isIgnored = function(path, stats) {
if (this.options.atomic && dotRe.test(path)) return true;
if (!this._userIgnored) {
var cwd = this.options.cwd;
var ignored = this.options.ignored;
if (cwd && ignored) {
ignored = ignored.map(function (path) {
if (typeof path !== 'string') return path;
return isAbsolute(path) ? path : sysPath.join(cwd, path);
});
}
var paths = arrify(ignored)
.filter(function(path) {
return typeof path === 'string' && !isGlob(path);
}).map(function(path) {
return path + '/**';
});
this._userIgnored = anymatch(
this._globIgnored.concat(ignored).concat(paths)
);
}
return this._userIgnored([path, stats]);
};
// Private method: Provides a set of common helpers and properties relating to
// symlink and glob handling
//
// * path - string, file, directory, or glob pattern being watched
// * depth - int, at any depth > 0, this isn't a glob
//
// Returns object containing helpers for this path
var replacerRe = /^\.[\/\\]/;
FSWatcher.prototype._getWatchHelpers = function(path, depth) {
path = path.replace(replacerRe, '');
var watchPath = depth || this.options.disableGlobbing || !isGlob(path) ? path : globParent(path);
var fullWatchPath = sysPath.resolve(watchPath);
var hasGlob = watchPath !== path;
var globFilter = hasGlob ? anymatch(path) : false;
var follow = this.options.followSymlinks;
var globSymlink = hasGlob && follow ? null : false;
var checkGlobSymlink = function(entry) {
// only need to resolve once
// first entry should always have entry.parentDir === ''
if (globSymlink == null) {
globSymlink = entry.fullParentDir === fullWatchPath ? false : {
realPath: entry.fullParentDir,
linkPath: fullWatchPath
};
}
if (globSymlink) {
return entry.fullPath.replace(globSymlink.realPath, globSymlink.linkPath);
}
return entry.fullPath;
};
var entryPath = function(entry) {
return sysPath.join(watchPath,
sysPath.relative(watchPath, checkGlobSymlink(entry))
);
};
var filterPath = function(entry) {
if (entry.stat && entry.stat.isSymbolicLink()) return filterDir(entry);
var resolvedPath = entryPath(entry);
return (!hasGlob || globFilter(resolvedPath)) &&
this._isntIgnored(resolvedPath, entry.stat) &&
(this.options.ignorePermissionErrors ||
this._hasReadPermissions(entry.stat));
}.bind(this);
var getDirParts = function(path) {
if (!hasGlob) return false;
var parts = sysPath.relative(watchPath, path).split(/[\/\\]/);
return parts;
};
var dirParts = getDirParts(path);
if (dirParts && dirParts.length > 1) dirParts.pop();
var unmatchedGlob;
var filterDir = function(entry) {
if (hasGlob) {
var entryParts = getDirParts(checkGlobSymlink(entry));
var globstar = false;
unmatchedGlob = !dirParts.every(function(part, i) {
if (part === '**') globstar = true;
return globstar || !entryParts[i] || anymatch(part, entryParts[i]);
});
}
return !unmatchedGlob && this._isntIgnored(entryPath(entry), entry.stat);
}.bind(this);
return {
followSymlinks: follow,
statMethod: follow ? 'stat' : 'lstat',
path: path,
watchPath: watchPath,
entryPath: entryPath,
hasGlob: hasGlob,
globFilter: globFilter,
filterPath: filterPath,
filterDir: filterDir
};
};
// Directory helpers
// -----------------
// Private method: Provides directory tracking objects
//
// * directory - string, path of the directory
//
// Returns the directory's tracking object
FSWatcher.prototype._getWatchedDir = function(directory) {
var dir = sysPath.resolve(directory);
var watcherRemove = this._remove.bind(this);
if (!(dir in this._watched)) this._watched[dir] = {
_items: Object.create(null),
add: function(item) {
if (item !== '.' && item !== '..') this._items[item] = true;
},
remove: function(item) {
delete this._items[item];
if (!this.children().length) {
fs.readdir(dir, function(err) {
if (err) watcherRemove(sysPath.dirname(dir), sysPath.basename(dir));
});
}
},
has: function(item) {return item in this._items;},
children: function() {return Object.keys(this._items);}
};
return this._watched[dir];
};
// File helpers
// ------------
// Private method: Check for read permissions
// Based on this answer on SO: http://stackoverflow.com/a/11781404/1358405
//
// * stats - object, result of fs.stat
//
// Returns boolean
FSWatcher.prototype._hasReadPermissions = function(stats) {
return Boolean(4 & parseInt(((stats && stats.mode) & 0x1ff).toString(8)[0], 10));
};
// Private method: Handles emitting unlink events for
// files and directories, and via recursion, for
// files and directories within directories that are unlinked
//
// * directory - string, directory within which the following item is located
// * item - string, base path of item/directory
//
// Returns nothing
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
// if it is not a directory, nestedDirectoryChildren will be empty array
var path = sysPath.join(directory, item);
var fullPath = sysPath.resolve(path);
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)
if (!this._throttle('remove', path, 100)) return;
// if the only watched file is removed, watch for its return
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]();
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 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) {
if (isAbsolute(path)) {
return path;
} else if (path[0] === '!') {
return '!' + sysPath.join(cwd, path.substring(1));
} else {
return sysPath.join(cwd, path);
}
});
// 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]();
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);
};