1#! /usr/bin/ruby
2# contributed by Minero Aoki.
3
4require 'optparse'
5
6parser = OptionParser.new
7parser.on('-i') { puts "-i" }
8parser.on('-o') { puts '-o' }
9
10subparsers = Hash.new {|h,k|
11  $stderr.puts "no such subcommand: #{k}"
12  exit 1
13}
14subparsers['add'] = OptionParser.new.on('-i') { puts "add -i" }
15subparsers['del'] = OptionParser.new.on('-i') { puts "del -i" }
16subparsers['list'] = OptionParser.new.on('-i') { puts "list -i" }
17
18parser.order!(ARGV)
19subparsers[ARGV.shift].parse!(ARGV) unless ARGV.empty?
20