postal.js/example/node/node_modules/socket.io/lib/logger.js

/*!
 * socket.io-node
 * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var util = require( './util' )
	, toArray = util.toArray;

/**
 * Log levels.
 */

var levels = [
	'error'
	, 'warn'
	, 'info'
	, 'debug'
];

/**
 * Colors for log levels.
 */

var colors = [
	31
	, 33
	, 36
	, 90
];

/**
 * Pads the nice output to the longest log level.
 */

function pad( str ) {
	var max = 0;

	for ( var i = 0, l = levels.length; i < l; i++ ) {
		max = Math.max( max, levels[i].length );
	}

	if ( str.length < max ) {
		return str + new Array( max - str.length + 1 ).join( ' ' );
	}

	return str;
}
;

/**
 * Logger (console).
 *
 * @api public
 */

var Logger = module.exports = function ( opts ) {
	opts = opts || {}
	this.colors = false !== opts.colors;
	this.level = 3;
	this.enabled = true;
};

/**
 * Log method.
 *
 * @api public
 */

Logger.prototype.log = function ( type ) {
	var index = levels.indexOf( type );

	if ( index > this.level || !this.enabled ) {
		return this;
	}

	console.log.apply(
		console
		, [this.colors
			   ? '   \033[' + colors[index] + 'm' + pad( type ) + ' -\033[39m'
			   : type + ':'
		].concat( toArray( arguments ).slice( 1 ) )
	);

	return this;
};

/**
 * Generate methods.
 */

levels.forEach( function ( name ) {
	Logger.prototype[name] = function () {
		this.log.apply( this, [name].concat( toArray( arguments ) ) );
	};
} );