A script to retweet any direct messages sent to the account.

twitter_echo_bot.rb

require "rubygems"
gem "twitter4r"
require "twitter"
require "active_support"

Twitter::Client.configure do |conf|
  conf.application_name = "Twitter Echo"
end

username, password = ARGV.shift, ARGV.shift
STDERR.puts "Usage #{$0} <username> <password>" unless username and password
exit(1)

client = Twitter::Client.new(:login => username, :password => password)
history_path = "#{username}.yml"

while true
  begin
    if File.exist? history_path
      handled_messages = YAML.load(File.open(history_path)) || Set.new()
    else
      handled_messages = Set.new()
      no_post = true
    end

    client.messages(:received).map{|m| [m.id, m.sender.screen_name, m.text] }.reverse.each do |id, user, message|
      client.status(:post, "#{message} [@#{user}]") unless no_post or handled_messages.include?(id)
      handled_messages << id
    end

  rescue => e
    STDERR.puts "#{e.class.name}: #{e.message}"
    e.backtrace.each{|l| STDERR.puts "\t#{l}" }
    STDERR.puts
  ensure
    File.open(history_path, "w"){|f| f.puts YAML.dump(handled_messages) }
  end
  sleep(300)
end