From: Gavin Sinclair <gsinclair@...>
Date: 2002-12-01T23:14:00+09:00
Subject: Re: getoptlong

From: <wybo@servalys.nl>


> Hi,
>
> I'm completely new to ruby, used perl until now.
> In perl I can say:
>
> GetOptions('--option',\$option);
> warn "--option was set\n" if $option;
>
> In ruby, the first line would become:
>
> opts=GetoptLong.new(
>   [ "--option",   "-o", GetoptLong::NO_ARGUMENT ]
> )
>
> But I see no simple way to straightforwardly test whether --option was
> set. Is there a way?
>
> Can I find some examples of ruby somewhere to learn things like this?

Not as far as I know, since global variables are considered bad style, in
general, in Ruby programming.  The deprecated "getopts" library set global
variables - chance or coincidence?  A Ruby reference - try online PickAxe -
will detail what you can and can't do.

As for me, I just set default values before I parse the options (like this,
since you're a Perler):

  opts.each do |option, arg|
    case option
      when '-o' then output_target = arg
      when '-O' then optimization = arg
      when '-g' then debug = true
    end
  end

Gavin