指定したscreen_nameのfollowingのscreen_nameの変更をチェックする感じ。

screen_name-check.rb

=begin

必要なもの
$ gem install rubytter
./target.yaml ( screen_nameの配列の形になってるもの )
../oauth_yaml/#{Client}-#{App}.yaml ( TwitterOAuthの情報を格納したもの )

これはなに
指定したscreen_nameのfollowingのscreen_nameの変更をチェックする感じ。

つかいかた
$ crontab -e
で、こんな感じの追記をして
0	0	*	*	*	/path/to/ruby /path/to/screen_name-check.rb
後は適当な画面で
$ tail -f /path/to/log/*-screen_name-log.txt

tail -f で気付けなくても、cronからのメールで気付けるかもしれないってときは CronMail を true にすればいいと思う。

=end

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

#設定用の定数など
DEBUG = false

Client = 'DNPP'
App = 'Ofuton'
Target = 'DNPP'

CDIR = File.dirname(File.expand_path(__FILE__))
OAuth_YAML = CDIR+'/../oauth_yaml/'+Client+'-'+App+'.yaml'

if DEBUG
  Log = true
  CronMail = false
  Sleep = false
  SleepWait = 0
  Log_DIR = CDIR+'/'+'log-dev'
  Data_DIR = CDIR+'/'+'data-dev'
  RetryWait = 0
  puts "---> DEBUG mode"
  puts "---> Log = #{Log}"
  puts "---> CronMail = #{CronMail}"
  puts "---> Sleep = #{Sleep}"
  puts "---> SleepWait = #{SleepWait}"
  puts "---> Log_DIR = #{Log_DIR}"
  puts "---> Data_DIR = #{Data_DIR}"
  puts "---> RetryWait = #{RetryWait}"
  puts ""
else
  Log = false
  CronMail = true
  Sleep = true
  SleepWait = 3
  Log_DIR = CDIR+'/'+'log'
  Data_DIR = CDIR+'/'+'data'
  RetryWait = 10
end

#YAMLへ保存しやすいように
def yaml_dump(contents,path)
  open(path,'w') { |i| i << YAML.dump(contents) }
end

#ログ保存しやすいように
def log_dump(contents,path)
  open(path,'a') { |i| i.puts contents }
end

#処理をまとめたclass
class ScreenNameCheck
  def initialize(screen_name)
    #重要っぽい変数など
    @screen_name = screen_name
    @user = Hash.new
    @following = Array.new
    @screen_names = Hash.new
    @screen_names_yaml = Data_DIR+'/'+@screen_name+'-'+'screen_names.yaml'
    @screen_names_yaml_now = Data_DIR+'/'+@screen_name+'-'+'screen_names'+'-'+DateTime.now.strftime("%Y%m%d%H%M")+'.yaml'
    @screen_names_before = Hash.new
    @log_txt = Log_DIR+'/'+@screen_name+'-'+'screen_name-log.txt'
    @now = DateTime.now.strftime("%Y-%m-%d %a %H:%M")
    @changes = false
    
    #OAuth周りの認証処理
    begin
      oauth = YAML.load_file(OAuth_YAML)
    rescue
      puts "---! Can't open #{OAuth_YAML}"
      exit
    end
    consumer = OAuth::Consumer.new(oauth['consumer_key'], oauth['consumer_secret'], :site => 'https://api.twitter.com')
    token = OAuth::AccessToken.new(consumer, oauth['oauth_token'], oauth['oauth_token_secret'])
    @t = OAuthRubytter.new(token)
    
    #screen_nameから諸情報を取得
    begin
      puts "---> fetching @#{@screen_name} user info" if Log
      @user = @t.user(@screen_name)
    rescue
      puts "---! Error in @t.user(\"#{@screen_name}\")   retry after #{RetryWait} seconds..." if Log
      sleep RetryWait
      begin
        @user = @t.user(@screen_name)
      rescue
        puts "---! Error in @t.user(\"#{@screen_name}\")"
        exit
      end
    end
  end
  
  #followingの取得
  def get_following
    puts "---> fetching @#{@screen_name}'s following" if Log
    next_cursor = -1
    while next_cursor != 0
      begin
        puts "---> fetching @#{@screen_name}'s following cursor #{next_cursor}" if Log
        tmp = @t.friends(@user[:id],:cursor=>next_cursor)
      rescue
        puts "---! Error in @t.friends(#{@user[:id]},:cursor=>#{next_cursor}) ( #{@user[:id]} = #{@screen_name} )   retry after #{RetryWait} seconds..." if Log
        sleep RetryWait
        begin
          tmp = @t.friends(@user[:id],:cursor=>next_cursor)
        rescue
          puts "---! Error in @t.friends(#{@user[:id]},:cursor=>#{next_cursor}) ( #{@user[:id]} = #{@screen_name} )"
          exit
        end
      end
      @following.concat [tmp]
      next_cursor = tmp[:next_cursor]
      sleep SleepWait
    end
  end
  
  #screen_namesの取得
  def get_screen_names
    @following.each do |i|
      i[:users].each { |j| @screen_names[j[:id]] = j[:screen_name] }
    end
    #screen_namesをYAMLにdumpしたり、前回取得分をロードする
    if File.exist?(@screen_names_yaml)
      puts "---> load screen_names_yaml into screen_names_before" if Log
      @screen_names_before = YAML.load_file(@screen_names_yaml)
      puts "---> dump following in yaml" if Log
      yaml_dump(@screen_names,@screen_names_yaml)
      yaml_dump(@screen_names,@screen_names_yaml_now)
    elsif !File.exist?(@screen_names_yaml)
      puts "---> substitute screen_names for screen_names_before" if Log
      @screen_names_before = @screen_names
      puts "---> dump screen_names in yaml" if Log
      yaml_dump(@screen_names,@screen_names_yaml)
      yaml_dump(@screen_names,@screen_names_yaml_now)
    end
  end
  
  #screen_namesのdiffを取る
  def diff_screen_names
    @screen_names.each do |id,screen_name|
      screen_name_before = @screen_names_before[id]
      if ( screen_name_before && screen_name != screen_name_before )
        contents = "< screen_name change > @#{screen_name_before} -> @#{screen_name} http://twitter.com/#{screen_name}"
        puts "---> #{contents} " if Log
        puts "#{contents} " if CronMail
        log_dump(@now+' '+contents,@log_txt)
        @changes = true
      end
    end
    @screen_names_before.each do |id,screen_name_before|
      screen_name = @screen_names[id]
      if !screen_name
        contents = "< Account deleted ? > @#{screen_name_before} is gone... "
        puts "---> #{contents} " if Log
        puts "#{contents} " if CronMail
        log_dump(@now+' '+contents,@log_txt)
        @changes = true
      end
    end
  end
  
  #処理まとめ
  def main
    log_dump('',@log_txt) if !File.exists?(@log_txt)
    self.get_following
    self.get_screen_names
    self.diff_screen_names
    puts "---> no changes detect on @#{@screen_name}'s following screen_names" if ( !@changes && Log )
  end
end

#出力先ディレクトリの確認して無いなら作成
Dir.mkdir(Log_DIR) if !File.exist?(Log_DIR)
Dir.mkdir(Data_DIR) if !File.exist?(Data_DIR)

#実行
puts "---> --- @#{Target} ---" if Log
ScreenNameCheck.new(Target).main