ATNDの参加者リストからTwitter IDを取り出す

README.md

$ bundle install
$ bundle exec -- ./list_twitter_ids.rb atnd_url

Gemfile

source 'https://rubygems.org'

gem 'oga'

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    ansi (1.5.0)
    ast (2.2.0)
    oga (2.2)
      ast
      ruby-ll (~> 2.1)
    ruby-ll (2.1.2)
      ansi
      ast

PLATFORMS
  ruby

DEPENDENCIES
  oga

BUNDLED WITH
   1.11.2

list_twitter_ids.rb

#!/usr/bin/env ruby
# License: CC0
require "oga"
require "open-uri"
require "uri"

if ARGV.size != 1
  abort "Usage: #{File.basename(__FILE__)} [atnd URL]"
end

event_uri = ARGV.shift
event_page = Oga.parse_html(open(event_uri).read)
event_page.css('#members-join a[href^="/users/"]').each {|i|
  user_uri = URI.join("https://atnd.org/", i.get("href"))
  if user_uri.host != "atnd.org"
    raise "#{user_uri} is not under atnd.org."
  end

  sleep 1

  user_page = Oga.parse_html(open(user_uri).read)
  tw_link = user_page.at_css(
    '#users-show-info a[href^="http://twitter.com/"],' +
    '#users-show-info a[href^="https://twitter.com/"]'
  )
  if tw_link
    puts URI(tw_link.get("href").sub("/#!", "")).path.split("/")[1]
  else
    warn "Twitter ID is not found in #{user_uri} (#{user_page.at_css("#users h1").text.strip})."
  end
}