From: Robert Klemme <bob.news@...>
Date: 2004-11-12T20:28:27+09:00
Subject: Re: From getoptlong to optparse


<nobu.nokada@softhome.net> schrieb im Newsbeitrag
news:200411120150.iAC1otlO017036@sharui.nakada.niregi.kanuma.tochigi.jp...
> Hi,
>
> At Wed, 10 Nov 2004 23:23:31 +0900,
> Robert Klemme wrote in [ruby-talk:119714]:
> > Somehow I though Massimiliano will have multiple sub commands -
apparently
> > that was wrong.  Out of curiosity: What does the code above do in the
> > light of multiple sub commands?  As far as I understand it, once a
> > subcommand is encountered options for this subcommand are defined and
> > would remain valid once another subcommand is seen.  Is that right?
Or is
> > this scheme incapable of dealing with multiple sub commands.
>
> Do you mean this?
>
>   prog.rb --host example.com --port 1024 login --pass secret list --open

Yes, that's exactly the scenario I was thinking of ("login" and "list" as
sub commands).

> Then loop subcommand parser until ARGV becomes empty using
> #order! instead of #parse!.

I got lost somewhere in the diff below. :-)  What eaxtly is the difference
between "order!" and "parse!"?

Kind regards

    robert



> --- prog.rb 2004-11-12 10:33:03.000000000 +0900
> +++ mprog.rb 2004-11-12 10:47:16.000000000 +0900
> @@ -6,5 +6,5 @@ require 'pp'
>
>  # general options
> -opt = OptionParser.new do |opt|
> +general = OptionParser.new do |opt|
>    opt.banner = "Usage: #{$0} [general options] subcommand [specific
options]"
>    opt.define("  general options:")
> @@ -30,6 +30,7 @@ missing = proc {|opt|
>  begin
>    cmd = nil
> -  opt.order!(ARGV) {|cmd| opt.terminate}
> -  opt = OptionParser.new(opt) do |opt|
> +  (opt = general).order!(ARGV) {|cmd| opt.terminate}
> +  begin
> +    OptionParser.new(general) do |opt|
>      unless cmd
>        abort "#{$0}: command missing\n#{missing[opt]}"
> @@ -40,6 +41,6 @@ begin
>      opt.define("  specific options for #{cmd}:")
>      subopt[opt]
> -  end
> -  opt.parse!(ARGV)
> +    end.order!(ARGV) {|cmd| opt.terminate}
> +  end until ARGV.empty?
>  rescue OptionParser::ParseError => e
>    abort "#{e}\n#{opt}"
>
>
> -- 
> Nobu Nakada
>
>