Ruby Twitter CLI

#!/usr/bin/env ruby
 
require 'twitter'
require 'optparse'
 
# UI Application
 
$options = {}
 
class App
	def initialize(args)
		begin
			parse_options(args)
		rescue ArgumentError, OptionParser::ParseError => msg
			$stderr.print "Error: #{msg}\n"
			exit
		end
	end
 
	def parse_options(args)
		commands = [:update]
 
		OptionParser.new do |opts|
			opts.banner = "Usage: twitter [options]"
 
			opts.on("-c", "--command COMMAND", commands) do |v|
				$options[:command] = v
			end
 
			opts.on("-m", "--message MESSAGE") do |v|
				$options[:message] = v
			end
 
			opts.on("-u", "--username USER") do |v|
				$options[:username] = v
			end
 
			opts.on("-p", "--password PASSWORD") do |v|
				$options[:password] = v
			end
 
			opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
				$options[:verbose] = v
			end
 
			opts.on_tail("-h", "--help", "Show this message") do
				puts opts
				exit
			end
		end.parse!(args)
 
		case $options[:command]
		when :update
			raise ArgumentError, "Update needs a message" if not $options[:message]
		end
	end
 
	def run()
		case $options[:command]
		when :update
			print "update: %s\n" % [$options[:message]]
			conn = Twitter::Connection.new($options[:username], $options[:password])
			conn.status.update($options[:message])
		end
	end
end
 
app = App.new(ARGV)
app.run()