Log plugin

gistfile1.js

/*!
 * Log plugin
 * Copyright 2012, Vitaliy Petrychuk
 */

;(function(window) {

  var log = function() {
    if (window.debug_mode) {
      var stack = (new Error).stack;
      var args = arguments.length === 1 ? arguments[0] : Array.prototype.slice.call(arguments, 0).join(' ');
      console.log(args + (stack ? '\n' + stack.split('\n')[3].trim() : ''));
    }
  };

  window.log = function() { log.apply(this, ['->'].concat(Array.prototype.slice.call(arguments, 0))) };
  window.err = function() { log.apply(this, ['-!'].concat(Array.prototype.slice.call(arguments, 0))) };

}(window));