Option function and default parameter is not executed

In source diving the arguments passed to command.option, it appears that it accepts a 3rd and 4th parameter for defining a function and default value for the option, but it appears that these aren’t actually being executed. In this test case, I was unable to get a default value or have the function execute. Am I doing something wrong, or is this just not supported yet?

#! /usr/bin/env node

let Vorpal = require('vorpal');
let cli = new Vorpal();

cli
  .command('test')
  .description('A test')
  .option('--url <url>', 'Some url', function(val) { cli.log('VALUE!', value); }, 'http://some.url')
  .action(function(args, done) {
    this.log('URL:', args.options.url);
    done();
  });

cli.parse(process.argv);

$ ./cli test
URL: undefined

$ ./cli test --url other.url
URL: other.url

[eliperelman]

What’s interesting about this approach is that the same function passed to .option could be used for validation as well. Maybe it could be sniffed to see if value instanceof Error, then return the error message instead of “missing required option”. Just an idea.

[eliperelman]

@dthree any more thoughts on this? Just had this come up on another project that would be useful.