tweet.rb

#!/usr/bin/env ruby

require 'twitter'
require 'yaml'

if ARGV.length != 1
  puts 'usage: ./tweet.rb Hello!'
  exit
end

config = YAML.load(DATA.read)
oauth = Twitter::OAuth.new(config[:ctoken], config[:csecret])

unless config[:atoken] && config[:asecret]
  puts 'redirecting to twitter to authorize...'
  `open #{oauth.request_token.authorize_url}`
  print 'Enter the PIN number: '
  pin = STDIN.gets.chomp

  atoken = oauth.request_token.get_access_token(:oauth_verifier => pin)
  config[:atoken]  = atoken.token
  config[:asecret] = atoken.secret

  File.open(__FILE__, 'r+') {|f|
    while line = f.gets
      break if line == "__END__\n"
    end
    f << YAML.dump(config)
    f.truncate(f.tell)
  }
end

oauth.authorize_from_access(config[:atoken], config[:asecret])
twitter = Twitter::Base.new(oauth)
twitter.update(ARGV[0])

puts 'Status updated!'

__END__
--- 
:ctoken: yI6eHp6FBwQSbGdHOOg
:csecret: WWIgAXZ3mjgxGxYbKp0ukVFFfrxCAVFrWyDdj94Q9U