update

node_modules/batch/index.js

@@ -0,0 +1,173 @@
+/**
+ * Module dependencies.
+ */
+
+try {
+  var EventEmitter = require('events').EventEmitter;
+  if (!EventEmitter) throw new Error();
+} catch (err) {
+  var Emitter = require('emitter');
+}
+
+/**
+ * Defer.
+ */
+
+var defer = typeof process !== 'undefined' && process && typeof process.nextTick === 'function'
+  ? process.nextTick
+  : function(fn){ setTimeout(fn); };
+
+/**
+ * Noop.
+ */
+
+function noop(){}
+
+/**
+ * Expose `Batch`.
+ */
+
+module.exports = Batch;
+
+/**
+ * Create a new Batch.
+ */
+
+function Batch() {
+  if (!(this instanceof Batch)) return new Batch;
+  this.fns = [];
+  this.concurrency(Infinity);
+  this.throws(true);
+  for (var i = 0, len = arguments.length; i < len; ++i) {
+    this.push(arguments[i]);
+  }
+}
+
+/**
+ * Inherit from `EventEmitter.prototype`.
+ */
+
+if (EventEmitter) {
+  Batch.prototype.__proto__ = EventEmitter.prototype;
+} else {
+  Emitter(Batch.prototype);
+}
+
+/**
+ * Set concurrency to `n`.
+ *
+ * @param {Number} n
+ * @return {Batch}
+ * @api public
+ */
+
+Batch.prototype.concurrency = function(n){
+  this.n = n;
+  return this;
+};
+
+/**
+ * Queue a function.
+ *
+ * @param {Function} fn
+ * @return {Batch}
+ * @api public
+ */
+
+Batch.prototype.push = function(fn){
+  this.fns.push(fn);
+  return this;
+};
+
+/**
+ * Set wether Batch will or will not throw up.
+ *
+ * @param  {Boolean} throws
+ * @return {Batch}
+ * @api public
+ */
+Batch.prototype.throws = function(throws) {
+  this.e = !!throws;
+  return this;
+};
+
+/**
+ * Execute all queued functions in parallel,
+ * executing `cb(err, results)`.
+ *
+ * @param {Function} cb
+ * @return {Batch}
+ * @api public
+ */
+
+Batch.prototype.end = function(cb){
+  var self = this
+    , total = this.fns.length
+    , pending = total
+    , results = []
+    , errors = []
+    , cb = cb || noop
+    , fns = this.fns
+    , max = this.n
+    , throws = this.e
+    , index = 0
+    , done;
+
+  // empty
+  if (!fns.length) return defer(function(){
+    cb(null, results);
+  });
+
+  // process
+  function next() {
+    var i = index++;
+    var fn = fns[i];
+    if (!fn) return;
+    var start = new Date;
+
+    try {
+      fn(callback);
+    } catch (err) {
+      callback(err);
+    }
+
+    function callback(err, res){
+      if (done) return;
+      if (err && throws) return done = true, defer(function(){
+        cb(err);
+      });
+      var complete = total - pending + 1;
+      var end = new Date;
+
+      results[i] = res;
+      errors[i] = err;
+
+      self.emit('progress', {
+        index: i,
+        value: res,
+        error: err,
+        pending: pending,
+        total: total,
+        complete: complete,
+        percent: complete / total * 100 | 0,
+        start: start,
+        end: end,
+        duration: end - start
+      });
+
+      if (--pending) next();
+      else defer(function(){
+        if(!throws) cb(errors, results);
+        else cb(null, results);
+      });
+    }
+  }
+
+  // concurrency
+  for (var i = 0; i < fns.length; i++) {
+    if (i == max) break;
+    next();
+  }
+
+  return this;
+};