ついカッとなって書いたりむったーもどきのRubyスクリプト。OAuthは自分で取得して読み替えてください。

remtter.rb

# -*- coding: utf-8 -*-

if ARGV.empty?
  puts "Usage ruby remtter.rb [screen_name] ..."
end

require 'rubygems'
require 'rubytter'
require 'yaml'

TargetUsers = ARGV

CurrentDir = File.dirname(File.expand_path(__FILE__))
OauthPath = "#{CurrentDir}/../mitukiii.jp.yml"

# Initialize Twitter.
oauth = YAML.load_file(OauthPath)
consumer = OAuth::Consumer.new(oauth[:consumer_key],
                               oauth[:consumer_secret],
                               :site => "http://twitter.com")
token = OAuth::AccessToken.new(consumer,
                               oauth[:oauth_token],
                               oauth[:oauth_token_secret])
t = OAuthRubytter.new(token)

TargetUsers.each do |user|
  path = "followers.#{user}.yml"
  today = t.followers_ids(user)

  # Read yesterday followers.
  yesterday = File.exists?(path)? YAML.load_file(path): today

  # Get screen names.
  names = (yesterday - today).collect do |id|
    begin
      puts id
      follower = rubytter.user(id)
      "@#{follower[:screen_name]}"
    rescue => e
      # Error occur when user account is deleted.
      puts e
    end
  end.select do |name|
    not name.nil?
  end

  # Send direct message.
  until names.empty?
    message = "#{names.slice!(0, 7).join(' ')} にアンフォローされました。"
    puts message
    t.direct_message(user, message)
  end

  # Write today followers.
  YAML.dump(today, File.open(path, 'w'))
end