setup.js

var prompt = require('prompt');

var all_config_options = '[\n';

var config_params = [
  {
    name: 'Server',
    validator: /^[a-zA-Z.]+$/,
    warning: 'Invalid server name',
    required: true
  },
  {
    name: 'Channels',
    validator: /(([, ]*#[a-z]+)+)$/, // make sure to update setup.js tests when making changes to this regex expression
    type: 'string',
    warning: 'Must follow the pattern of <#channel> or <#channel, #channel>',
    required: true
  },
  {
    name: 'Nick',
    default: 'nbot'
  },
  {
    name: 'Password',
    hidden: true,
    replace: '*'
  }
];

var yes_no = [
  {
    name: 'Add',
    validator: /^[yn]$/,
    warning: 'Input y or n'
  }
];

prompt.message = "";
prompt.start();

console.log('Specify IRC bot configuration parameters.');

(function add_server() {
  prompt.delimiter = ':';
  prompt.get(config_params, function (err, result) {
    if (err) { return onErr(err); }
    console.log('Added server to configuration');
    console.log('  Server: ' + result.Server);
    console.log('  Channels: ' + result.Channels);
    console.log('  Nick: ' + result.Nick);

    // remove all whitespaces and convert to array
    result.Channels = result.Channels.replace(/ /g, '').split(',');

    config_options = JSON.stringify(result, null, 4);
    all_config_options = all_config_options + config_options;



    prompt.delimiter = ' another server ? (y/n): ';
    prompt.get(yes_no, function (err, result) {
      if (err) { return onErr(err); }
      if (result.Add == 'y') {
        all_config_options = all_config_options + ',\n';
        add_server();
      } else {
        all_config_options = all_config_options + '\n]';
        console.log('Saving configuration');
        fs = require('fs');
        fs.appendFile('config.json', all_config_options, function (err) {
          if (err) {
            console.log(err);
          } else {
            console.log('Configuration written to config.json');
          }
        });
      }
    });
  });

}());

function onErr(err) {
  console.log(err);
  process.exit(1);
}