63 lines
1.5 KiB
JavaScript
63 lines
1.5 KiB
JavaScript
var util = require('util'),
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EventEmitter = require('events').EventEmitter,
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utils = {};
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utils.table = function(fields) {
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if (!fields[0]) return;
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var lengths = fields[0].map(function(val, i) {
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return Math.max.apply(Math, fields.map(function(field) {
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if (field[i] === undefined) field[i] = '';
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return field[i].toString().length;
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}));
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});
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fields.forEach(function(field) {
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console.warn(
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field.map(function(val, i) {
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if (i >= lengths.length - 1) return val;
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return val + Array(lengths[i] - val.toString().length + 1).join(' ');
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}).join(' ')
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);
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});
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};
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function Queue(callback, concurrency) {
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this.callback = callback;
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this.concurrency = concurrency || 10;
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this.next = this.next.bind(this);
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this.invoke = this.invoke.bind(this);
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this.queue = [];
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this.running = 0;
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}
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util.inherits(Queue, EventEmitter);
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Queue.prototype.add = function(item) {
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this.queue.push(item);
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if (this.running < this.concurrency) {
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this.running++;
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this.next();
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}
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};
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Queue.prototype.invoke = function() {
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if (this.queue.length) {
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this.callback(this.queue.shift(), this.next);
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} else {
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this.next();
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}
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};
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Queue.prototype.next = function(err) {
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if (this.queue.length) {
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process.nextTick(this.invoke);
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} else {
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this.running--;
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if (!this.running) {
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this.emit('empty');
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}
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}
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};
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utils.Queue = Queue;
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module.exports = utils;
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