From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2007-10-09T01:07:03+09:00
Subject: Re: optparse and required switches

On 10/8/07, Felix Windt <fwmailinglists@gmail.com> wrote:
> > [mailto:list-bounce@example.com] On Behalf Of Roger Nordqvist

> > Im lost with optparse.
> >
> > Got a couple of questions if its OK.
> >
> > 1. I've been reading the documentation but I cant get it into my thick
> > head how I tell an option that it is required or optional? I guess all
> > opts are optional initially, but how do I say that an option is
> > required.
> >
>
> I don't think support for that is built into optparse - you'll have to set
> flags from the options parsed and then throw an error if a certain flag
> isn't set.

For this it might be worth to look into CodeForPeople's main gem (gem
install main). I've been using it in a couple of things lately and am
quite happy. You can specify if an option is required or not, and if
it has arguments which are required or not, etc. in a very simple
syntax.

require 'main'

main {
   option("verbose", "v") {
      required
  }
}

Hope this helps,

Jesus.