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#! /usr/bin/env node
"use strict";
/**
* @module BrowserSync
*/
var pjson = require("../package.json");
var BrowserSync = require("./browser-sync");
var publicUtils = require("./public/public-utils");
var events = require("events");
var PassThrough = require("stream").PassThrough;
var logger = require("eazy-logger").Logger({
useLevelPrefixes: true
});
var singleton = false;
var singletonPlugins = [];
var instances = [];
/**
* @type {boolean|EventEmitter}
*/
var singletonEmitter = false;
module.exports = initSingleton;
/**
* Create a Browsersync instance
* @method create
* @param {String} name an identifier that can used for retrieval later
*/
/**
* Get a single instance by name. This is useful if you have your
* build scripts in separate files
* @method get
* @param {String} name
* @returns {Object|Boolean}
*/
module.exports.get = function (name) {
var instance = getSingle(name);
if (instance) {
return instance;
}
throw new Error("An instance with the name `%s` was not found.".replace("%s", name));
};
/**
* Check if an instance has been created.
* @method has
* @param {String} name
* @returns {Boolean}
*/
module.exports.has = function (name) {
var instance = getSingle(name);
if (instance) {
return true;
}
return false;
};
/**
* Start the Browsersync service. This will launch a server, proxy or start the snippet
* mode depending on your use-case.
* @method init
* @param {Object} [config] This is the main configuration for your Browsersync instance and can contain any of the [available options]({{site.links.options}})
* If you do not pass a config an argument for configuration, Browsersync will still run; but it will be in the `snippet` mode
* @param {Function} [cb] If you pass a callback function, it will be called when Browsersync has completed all setup tasks and is ready to use. This
* is useful when you need to wait for information (for example: urls, port etc) or perform other tasks synchronously.
* @returns {BrowserSync}
*/
module.exports.init = initSingleton;
/**
* Register a plugin. Must implement at least a 'plugin' method that returns a
* callable function.
*
* @method use
* @param {String} name The name of the plugin
* @param {Object} module The object to be `required`.
* @param {Function} [cb] A callback function that will return any errors.
*/
module.exports.use = function () {
var args = Array.prototype.slice.call(arguments);
singletonPlugins.push({
args: args
});
};
/**
* The `reload` method will inform all browsers about changed files and will either cause the browser to refresh, or inject the files where possible.
*
* @method reload
* @param {String|Array|Object} [arg] The file or files to be reloaded.
* @returns {*}
*/
module.exports.reload = noop("reload");
/**
* The `stream` method returns a transform stream and can act once or on many files.
*
* @method stream
* @param {Object} [opts] Configuration for the stream method
* @param {Object} [opts.match] Resulting files to reload. The path is from the
* root of the site (not the root of your project). You can use '**' to recurse
* directories.
* @param {Object} [opts.once] Only reload on the first changed file in the stream.
* @since 2.6.0
* @returns {*}
*/
module.exports.stream = noop("stream");
/**
* Helper method for browser notifications
*
* @method notify
* @param {String|HTML} msg Can be a simple message such as 'Connected' or HTML
* @param {Number} [timeout] How long the message will remain in the browser. @since 1.3.0
*/
module.exports.notify = noop("notify");
/**
* This method will close any running server, stop file watching & exit the current process.
*
* @method exit
*/
module.exports.exit = noop("exit");
/**
* Stand alone file-watcher. Use this along with Browsersync to create your own, minimal build system
* @method watch
* @param {string} patterns Glob patterns for files to watch
* @param {object} [opts] Options to be passed to Chokidar - check what's available in [their docs](https://github.com/paulmillr/chokidar#getting-started)
* @param {function} [fn] Callback function for each event.
* @since 2.6.0
*/
module.exports.watch = noop("watch");
/**
* Method to pause file change events
*
* @method pause
*/
module.exports.pause = noop("pause");
/**
* Method to resume paused watchers
*
* @method resume
*/
module.exports.resume = noop("resume");
/**
* Add properties fo
*/
Object.defineProperties(module.exports, {
/**
* The internal Event Emitter used by the running Browsersync instance (if there is one).
* You can use this to emit your own events, such as changed files, logging etc.
*
* @property emitter
*/
emitter: {
get: function () {
if (!singletonEmitter) {
singletonEmitter = newEmitter();
return singletonEmitter;
}
return singletonEmitter;
}
},
/**
* A simple true/false flag that you can use to determine if there's a currently-running Browsersync instance.
*
* @property active
*/
active: {
get: getSingletonValue.bind(null, "active")
},
/**
* A simple true/false flag to determine if the current instance is paused
*
* @property paused
*/
paused: {
get: getSingletonValue.bind(null, "paused")
}
});
/**
* Event emitter factory
* @returns {EventEmitter}
*/
function newEmitter() {
var emitter = new events.EventEmitter();
emitter.setMaxListeners(20);
return emitter;
}
/**
* Get the singleton's emitter, or a new one.
* @returns {EventEmitter}
*/
function getSingletonEmitter() {
if (singletonEmitter) {
return singletonEmitter;
}
singletonEmitter = newEmitter();
return singletonEmitter;
}
/**
* Helper to allow methods to be called on the module export
* before there's a running instance
* @param {String} name
* @returns {Function}
*/
function noop(name) {
return function () {
var args = Array.prototype.slice.call(arguments);
if (singleton) {
return singleton[name].apply(singleton, args);
}
else {
if (publicUtils.isStreamArg(name, args)) {
return new PassThrough({ objectMode: true });
}
}
};
}
/**
* Create a single instance when module export is used directly via browserSync({});
* This is mostly for back-compatibility, for also for the nicer api.
* This will never be removed to ensure we never break user-land, but
* we should discourage it's use.
* @returns {*}
*/
function initSingleton() {
var instance;
if (instances.length) {
instance = instances.filter(function (item) {
return item.name === "singleton";
});
if (instance.length) {
logger.error("{yellow:You tried to start Browsersync twice!} To create multiple instances, use {cyan:browserSync.create().init()");
return instance;
}
}
var args = Array.prototype.slice.call(arguments);
singleton = create("singleton", getSingletonEmitter());
if (singletonPlugins.length) {
singletonPlugins.forEach(function (obj) {
singleton.instance.registerPlugin.apply(singleton.instance, obj.args);
});
}
singleton.init.apply(null, args);
return singleton;
}
/**
* @param {String} prop
* @returns {Object|Boolean}
*/
function getSingletonValue(prop) {
var single = getSingle("singleton");
if (single) {
return single[prop];
}
return false;
}
/**
* Get a single instance by name
* @param {String} name
* @returns {Object|Boolean}
*/
function getSingle(name) {
if (instances.length) {
var match = instances.filter(function (item) {
return item.name === name;
});
if (match.length) {
return match[0];
}
}
return false;
}
/**
* Create an instance of Browsersync
* @param {String} [name]
* @param {EventEmitter} [emitter]
* @returns {{init: *, exit: (exit|exports), notify: *, reload: *, cleanup: *, emitter: (Browsersync.events|*), use: *}}
*/
/**
* Reset the state of the module.
* (should only be needed for test environments)
*/
module.exports.reset = function () {
instances.forEach(function (item) {
item.cleanup();
});
instances = [];
singletonPlugins = [];
singletonEmitter = false;
singleton = false;
};
/**
* @type {Array}
*/
module.exports.instances = instances;
/**
* Create an instance of Browsersync
* @param {String} [name]
* @param {EventEmitter} [emitter]
* @returns {{init: *, exit: (exit|exports), notify: *, reload: *, cleanup: *, emitter: (Browsersync.events|*), use: *}}
*/
module.exports.create = create;
function create(name, emitter) {
name = name || new Date().getTime();
emitter = emitter || newEmitter();
var browserSync = new BrowserSync(emitter);
var instance = {
name: name,
instance: browserSync,
exit: require("./public/exit")(browserSync),
notify: require("./public/notify")(browserSync),
pause: require("./public/pause")(browserSync),
resume: require("./public/resume")(browserSync),
reload: require("./public/reload")(emitter),
stream: require("./public/stream")(emitter),
cleanup: browserSync.cleanup.bind(browserSync),
use: browserSync.registerPlugin.bind(browserSync),
getOption: browserSync.getOption.bind(browserSync),
emitter: browserSync.events,
watch: require("./file-watcher").watch
};
browserSync.publicInstance = instance;
instance.init = require("./public/init")(browserSync, name, pjson);
Object.defineProperty(instance, "active", {
get: function () {
return browserSync.active;
}
});
Object.defineProperty(instance, "paused", {
get: function () {
return browserSync.paused;
}
});
/**
* Access to client-side socket for emitting events
*
* @property sockets
*/
Object.defineProperty(instance, "sockets", {
get: function () {
if (!browserSync.active) {
return {
emit: function () { },
on: function () { }
};
}
else {
return browserSync.io.sockets;
}
}
});
instances.push(instance);
return instance;
}
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