How to validate command arguments?

[scotthovestadt]

If I have a command that looks like:

command-name [strategy]

If strategy can only be "insert", "update", or "upsert", for example, how do I use Vorpal to validate it?

[dthree]

I would just do a manual validation. Something like this:

const valids = ['insert', 'update', 'upsert'];
if (valids.indexOf(args.strategy) === -1) {
  this.log('Please enter a valid strategy');
  cb();
  return
}

---

This is actually a good question that will probably come up a lot. Would you mind posting this on Stack Overflow? There's a vorpal.js tag you can use.

[Shakyamuni177te]

I have posted a question on this:

http://stackoverflow.com/questions/33460454/validating-a-command-in-vorpal-js

[dthree]

Thanks.

[scotthovestadt]

The problem with this approach is it won't validate the arguments until the command is executed, which is a problem when you are piping commands together. Additionally, if you log an error it'll just go to the piped command.

I think we need to add a "validate" method to each command that can be called to validate arguments when the command is initialized but before it's executed?

[dthree]

Okay I'm totally down with this.

[scotthovestadt]

Re-open issue please!

[dthree]

:smiley:

[scotthovestadt]

@dthree Can you review https://github.com/dthree/vorpal/pull/57

[dthree]

57 fixed this, I belive.