From: nobu.nokada@...
Date: 2004-11-10T16:38:36+09:00
Subject: Re: From getoptlong to optparse

Hi,

At Wed, 3 Nov 2004 05:33:48 +0900,
Massimiliano Mirra - bard wrote in [ruby-talk:118836]:
> I have a command line program invoked like this:
> 
>   $ prog --host localhost --port 8000 login --password secret
>   $ prog --host localhost --port 8000 list --open
> 
> ....and so on.  In other words:
> 
>   $ command [general options] subcommand [specific options]
> 
> Like darcs or cvs.

I had included an example file cmd.rb (and its incidental file
cmd-ls.rb), in sole packaged optparse, but they are not bundled
now.


#! /usr/bin/ruby
require 'optparse'
require 'pp'

@host = @port = nil

# general options
opt = OptionParser.new do |opt|
  opt.banner = "Usage: #{$0} [general options] subcommand [specific options]"
  opt.define("  general options:")
  opt.define('--host HOST', String) {|host| @host = host}
  opt.define('--port PORT', Integer) {|port| @port = port}
end

# specific option initializers
specific = {
  "login" => proc do |opt|
    @passwd = nil
    opt.define("--password PASSWORD", String) {|passwd| @passwd = passwd}
  end,
  "list" => proc do |opt|
    @open = false
    opt.define("--open") {|open| @open = true}
  end,
}
missing = proc {|opt|
  opt.define(["  subcommand:", specific.keys.sort].join("\n\t"))
}

begin
  cmd = nil
  opt.order!(ARGV) {|cmd| opt.terminate}
  opt = OptionParser.new(opt) do |opt|
    unless cmd
      abort "#{$0}: command missing\n#{missing[opt]}"
    end
    subopt = specific.fetch(cmd) do
      abort "#{$0}: unknown command: #{cmd}\n#{missing[opt]}"
    end
    opt.define("  specific options for #{cmd}:")
    subopt[opt]
  end
  opt.parse!(ARGV)
rescue OptionParser::ParseError => e
  abort "#{e}\n#{opt}"
end
pp self


-- 
Nobu Nakada