option-parser.js

var _ = require('lodash'),
  argv = require('yargs').argv,
  input = _.first(argv._);

// everything else will default to 1
var defaults = {
  ideaCount: 4,
  questionCount: 2
};

// allows scenario loader to be run via command line
if(input) {
  parseCommands(input);
}


function parseCommands(commands) {
  var config = {};

  commands = commands.split('_and_');

  _.forEach(commands, function(command) {
    command = command.split('_');

    var count = _.first(command),
      entityType = _.last(command);

    countType = mapToCountType(entityType);

    config[countType] = toNum(count);
  });

  config = _.defaults(config, defaults);

  console.log(config);
  return config;
}

module.exports = parseCommands;

// renames ideas to ideaCount, etc.
function mapToCountType(entityType) {
  if(entityType[entityType.length - 1] === 's') {
    entityType = entityType.slice(0, entityType.length - 1);
  }

  return entityType + 'Count';
}

function toNum(string) {
  var nums = {
    one: 1,
    two: 2,
    three: 3,
    four: 4,
    five: 5,
    six: 6,
    seven: 7,
    eight: 8,
    nine: 9,
    ten: 10,
    fifteen: 15,
    twenty: 20,
    thirty: 30,
    fourty: 40,
    fifty: 50
  };

  return nums[string];
}

scenario-loader.js

var optionParser = require('./option-parser');

optionParser('five_ideas_and_one_question');

// => { ideaCount: 5, questionCount: 1 }

// option parser can also be run through the command line
// node option-parser two_questions_and_three_ideas
// => { questionCount: 2, ideaCount: 3 }