From: Stefano Crocco <stefano.crocco@...>
Date: 2007-05-28T03:59:02+09:00
Subject: Re: please help me with OptionParser

Alle domenica 27 maggio 2007, Christopher J. Bottaro ha scritto:
> Second, I got it to work by adding :REQUIRED to the on() method call,
> but that doesn't work as expected: �the argument isn't really
> "required"; OptionParser does not bomb if the argument is omitted.

From a previous thread on the list 
(http://www.ruby-forum.com/topic/49989#16302), I gather what you want to do 
is impossible with OptionParser (but it may be possible with other libraries: 
I've never used them so I can't tell). To achieve what you mean, you should 
check whether the option was given or not yourself, looking at the variable 
where you stored the options:

  if options.client_ids.empty?
    puts "You must specify an ID"
    exit
  end

> Third, I cannot get a switch to accept multiple arguments.
> --my_arg 1 2 3
> I want an array [1, 2, 3].

I don't think you can write a list of that kind, because OptionParser would 
treat every argument as a single option. You can specify more than one 
argument to an option, but you need to separe them with commas, not with 
spaces. If you do that, you can convert the result to an Array by specifying 
it:

  opts.on("--list", Array, "a test list){|a| options.list = a}

I hope this helps

Stefano