remtter.rb

require 'rubygems'
require 'rubytter'

TARGET_USER = 'mitukiii'

LOG = ARGV.any? {|arg| arg == '-l' || arg == '-log'}

CURRENT_DIR                = File.dirname(File.expand_path(__FILE__))
OAUTH_YAML_NAME            = 'mitukiii.jp.oauth.yaml'
FOLLOWERS_BEFORE_YAML_NAME = 'followers.txt'

oauth = YAML.load_file("#{CURRENT_DIR}/../#{OAUTH_YAML_NAME}")
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)
followers_current = t.followers_ids(TARGET_USER)

followers_before_yaml_path = "#{CURRENT_DIR}/#{FOLLOWERS_BEFORE_YAML_NAME}"
if File.exists?(followers_before_yaml_path)
  followers_before = YAML.load_file(followers_before_yaml_path)
else
  followers_before = followers_current
end
YAML.dump(followers_current, File.open(followers_before_yaml_path, 'w'))

followers_diff = followers_before - followers_current

followers_diff_names = followers_diff.collect do |follower_id|
  begin
    user = t.user(follower_id)
    screen_name = "@#{user[:screen_name]}"
    puts "unfollowed by #{screen_name}." if LOG
    screen_name
  rescue
    nil
  end
end.select {|name| !name.nil?}

if followers_diff_names.length > 0
  message = "#{followers_diff_names.join(' ')} にアンフォローされました。"
  puts message if LOG
  t.direct_message(TARGET_USER, message)
else
  puts "not unfollowed." if LOG
end