clown/lib/params.js

clown computing with pkgcloud

var _ = require('lodash'),
    async = require('async'),
    joi = require('joi'),
    traverse = require('traverse');

var log = require('./log'),
    prompt = require('./prompt'),
    traverseSchema = require('./traverse');

module.exports = function params(about, argv, callback) {
  var args = [];

  async.each(about.signature, function (schema, callback) {
    var name = Object.keys(schema).shift(),
        body = {},
        prompts = [];

    body[name] = _.cloneDeep(argv[name]);

    log.silly('params', 'Argument name `%s`', name);
    traverseSchema(schema, function(node) {
      var self = this;
      if (node._type !== 'object') {
        var property = traverse(body).get(self.path);
        log.silly('params', '`%s.%s == %j', name, self.path.join('.'), property);
        if (!property) {
          prompts.push(function(cb) {
            prompt(self.path, schema, function(err, res) {
              if (err) return cb(err);
              traverse(body).set(self.path, res);
              cb(null);
            });
          });
        }
      }
    });

    async.series(prompts, function(err) {
      if (err) return callback(err);

      var aintValid = joi.validate(body, schema);
      if (aintValid) {
        return callback(err);
      }

      args.push(body[name]);
      callback(null);
    });
  }, function (err) {
    if (err) return callback(err);
    log.silly('params', 'Arguments %j', args);
    callback(null, args); 
  });

};