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/*
 * console.js: Transport for outputting to the console
 *
 * (C) 2010 Charlie Robbins
 * MIT LICENCE
 *
 */

var events = require('events'),
    util = require('util'),
    colors = require('colors'),
    common = require('../common'),
    Transport = require('./transport').Transport;

//
// ### function Console (options)
// #### @options {Object} Options for this instance.
// Constructor function for the Console transport object responsible
// for persisting log messages and metadata to a terminal or TTY.
//
var Console = exports.Console = function (options) {
  Transport.call(this, options);
  options = options || {};

  this.json        = options.json        || false;
  this.colorize    = options.colorize    || false;
  this.prettyPrint = options.prettyPrint || false;
  this.timestamp   = typeof options.timestamp !== 'undefined' ? options.timestamp : false;
  this.label       = options.label       || null;

  if (this.json) {
    this.stringify = options.stringify || function (obj) {
      return JSON.stringify(obj, null, 2);
    };
  }
};

//
// Inherit from `winston.Transport`.
//
util.inherits(Console, Transport);

//
// Expose the name of this Transport on the prototype
//
Console.prototype.name = 'console';

//
// ### function log (level, msg, [meta], callback)
// #### @level {string} Level at which to log the message.
// #### @msg {string} Message to log
// #### @meta {Object} **Optional** Additional metadata to attach
// #### @callback {function} Continuation to respond to when complete.
// Core logging method exposed to Winston. Metadata is optional.
//
Console.prototype.log = function (level, msg, meta, callback) {
  if (this.silent) {
    return callback(null, true);
  }

  var self = this,
      output;

  output = common.log({
    colorize:    this.colorize,
    json:        this.json,
    level:       level,
    message:     msg,
    meta:        meta,
    stringify:   this.stringify,
    timestamp:   this.timestamp,
    prettyPrint: this.prettyPrint,
    raw:         this.raw,
    label:       this.label
  });

  if (level === 'error' || level === 'debug') {
    process.stderr.write(output + '\n');
  } else {
    process.stdout.write(output + '\n');
  }

  //
  // Emit the `logged` event immediately because the event loop
  // will not exit until `process.stdout` has drained anyway.
  //
  self.emit('logged');
  callback(null, true);
};