watchpack.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
var watcherManager = require("./watcherManager");
var EventEmitter = require("events").EventEmitter;
function Watchpack(options) {
EventEmitter.call(this);
if(!options) options = {};
if(!options.aggregateTimeout) options.aggregateTimeout = 200;
this.options = options;
this.watcherOptions = {
ignored: options.ignored,
poll: options.poll
};
this.fileWatchers = [];
this.dirWatchers = [];
this.mtimes = Object.create(null);
this.paused = false;
this.aggregatedChanges = [];
this.aggregatedRemovals = [];
this.aggregateTimeout = 0;
this._onTimeout = this._onTimeout.bind(this);
}
module.exports = Watchpack;
Watchpack.prototype = Object.create(EventEmitter.prototype);
Watchpack.prototype.watch = function watch(files, directories, startTime) {
this.paused = false;
var oldFileWatchers = this.fileWatchers;
var oldDirWatchers = this.dirWatchers;
this.fileWatchers = files.map(function(file) {
return this._fileWatcher(file, watcherManager.watchFile(file, this.watcherOptions, startTime));
}, this);
this.dirWatchers = directories.map(function(dir) {
return this._dirWatcher(dir, watcherManager.watchDirectory(dir, this.watcherOptions, startTime));
}, this);
oldFileWatchers.forEach(function(w) {
w.close();
}, this);
oldDirWatchers.forEach(function(w) {
w.close();
}, this);
};
Watchpack.prototype.close = function resume() {
this.paused = true;
if(this.aggregateTimeout)
clearTimeout(this.aggregateTimeout);
this.fileWatchers.forEach(function(w) {
w.close();
}, this);
this.dirWatchers.forEach(function(w) {
w.close();
}, this);
this.fileWatchers.length = 0;
this.dirWatchers.length = 0;
};
Watchpack.prototype.pause = function pause() {
this.paused = true;
if(this.aggregateTimeout)
clearTimeout(this.aggregateTimeout);
};
function addWatchersToArray(watchers, array) {
watchers.forEach(function(w) {
if(array.indexOf(w.directoryWatcher) < 0) {
array.push(w.directoryWatcher);
addWatchersToArray(Object.keys(w.directoryWatcher.directories).reduce(function(a, dir) {
if(w.directoryWatcher.directories[dir] !== true)
a.push(w.directoryWatcher.directories[dir]);
return a;
}, []), array);
}
});
}
Watchpack.prototype.getTimes = function() {
var directoryWatchers = [];
addWatchersToArray(this.fileWatchers.concat(this.dirWatchers), directoryWatchers);
var obj = Object.create(null);
directoryWatchers.forEach(function(w) {
var times = w.getTimes();
Object.keys(times).forEach(function(file) {
obj[file] = times[file];
});
});
return obj;
};
Watchpack.prototype._fileWatcher = function _fileWatcher(file, watcher) {
watcher.on("change", function(mtime, type) {
this._onChange(file, mtime, file, type);
}.bind(this));
watcher.on("remove", function(type) {
this._onRemove(file, file, type);
}.bind(this));
return watcher;
};
Watchpack.prototype._dirWatcher = function _dirWatcher(item, watcher) {
watcher.on("change", function(file, mtime, type) {
this._onChange(item, mtime, file, type);
}.bind(this));
return watcher;
};
Watchpack.prototype._onChange = function _onChange(item, mtime, file) {
file = file || item;
this.mtimes[file] = mtime;
if(this.paused) return;
this.emit("change", file, mtime);
if(this.aggregateTimeout)
clearTimeout(this.aggregateTimeout);
if(this.aggregatedChanges.indexOf(item) < 0)
this.aggregatedChanges.push(item);
this.aggregateTimeout = setTimeout(this._onTimeout, this.options.aggregateTimeout);
};
Watchpack.prototype._onRemove = function _onRemove(item, file) {
file = file || item;
delete this.mtimes[item];
if(this.paused) return;
this.emit("remove", item);
if(this.aggregateTimeout)
clearTimeout(this.aggregateTimeout);
if(this.aggregatedRemovals.indexOf(item) < 0)
this.aggregatedRemovals.push(item);
this.aggregateTimeout = setTimeout(this._onTimeout, this.options.aggregateTimeout);
};
Watchpack.prototype._onTimeout = function _onTimeout() {
this.aggregateTimeout = 0;
var changes = this.aggregatedChanges;
var removals = this.aggregatedRemovals;
this.aggregatedChanges = [];
this.aggregatedRemovals = [];
this.emit("aggregated", changes, removals);
};