coloured-log/lib/coloured-log.js

Combines "coloured" and "log.js" for super simple pretty logging.

var util = require('util')
  , Colour = require('coloured')
  , Log = require('log');

var colours = {};

colours[Log.EMERGENCY] = { background: 'red',    foreground: 'yellow', extra: 'bold' };
colours[Log.ALERT]     = { background: 'yellow', foreground: 'red',    extra: 'bold' };
colours[Log.CRITICAL]  = { background: 'yellow', foreground: 'black' };
colours[Log.ERROR]     = { foreground: 'red' };
colours[Log.WARNING]   = { foreground: 'yellow' };
colours[Log.NOTICE]    = { foreground: 'cyan' };
colours[Log.INFO]      = { foreground: 'green' };
colours[Log.DEBUG]     = {};

var ColouredLog = exports = module.exports = function ColouredLog(level, stream) {
  Log.call(this, level, stream);
};

ColouredLog.prototype = new Log;

ColouredLog.prototype.colours = colours;

// Need to inherit levels too
Object.keys(Log).forEach(function (level) {
  if (Log.hasOwnProperty(level)) {
    ColouredLog[level] = Log[level];
  }
});

ColouredLog.prototype.log = function (levelStr, args) {
  if (Log[levelStr] <= this.level) {
    var i = 1
      , msg = args[0].replace(/%s/g, function(){ return util.inspect(args[i++], false, 1); })
      , message = ''
        + '[' + new Date().toUTCString() + ']'
        + Colour.extra('bold')
        + ' ' + levelStr;
    
    message += new Array(47 - message.length).join(' ');
    
    message = Colour.colourise(message, this.colours[Log[levelStr]]);
    
    message += Colour.extra('clear')
      + '  '
      + msg
      + Colour.extra('clear')
      + '\n';
    
    this.stream.write(message);
  }
};