What's going on in business and tech on Meetup.com?

meetups.rb

#!/usr/bin/env ruby

# This doesn't click 'More', so it's not the same as
# using the Meetup API, but fuck that, it's simple and
# works just fine.
require 'open-uri'
require 'nokogiri'
require 'pry'

URLS = {
  'All' => 'http://www.meetup.com/find/events/?allMeetups=true&radius=50&userFreeform=London%2C+Greater+London%2C+England%2C+United+Kingdom&mcId=c1012717&mcName=London%2C+England%2C+GB&eventFilter=all',
  'Business' => 'http://www.meetup.com/find/events/career-business/?allMeetups=false&radius=50&userFreeform=London%2C+Greater+London%2C+England%2C+United+Kingdom&mcId=c1012717&mcName=London%2C+England%2C+GB&eventFilter=all',
  'Tech' => 'http://www.meetup.com/find/events/tech/?allMeetups=false&radius=50&userFreeform=London%2C+Greater+London%2C+England%2C+United+Kingdom&mcId=c1012717&mcName=London%2C+England%2C+GB&eventFilter=all',
}

class Event
  def initialize(li)
    @li = li
  end

  def attendee_count
    @li.css('.attendee-count').inner_html.scan(/\d+/).first.to_i
  end

  def start_time
    @li.css('time[itemprop=startDate]').attribute('datetime')
  end

  def to_s
    desc = @li.css('span[itemprop=summary]').inner_text
    url = @li.css('a[itemprop=url]').attribute('href')
    attendees = @li.css('.attendee-count').inner_html.scan(/\d+/).first
    "#{attendees}  | #{start_time} | #{desc} – #{url}"
  end
end

URLS.each do |name, url|
  puts "\n=== #{name} ==="
  open(url) do |stream|
    doc = Nokogiri::HTML(stream.read)

    events = doc.css('.event-listing').map do |li|
      Event.new(li)
    end

    puts events
      .select { |event| event.attendee_count > 20 }
      .sort_by { |event| event.attendee_count }.reverse
  end
end

__END__
<li class="event-listing line-gutters clearfix doc-padding  " data-year="2015" data-month="5" data-day="18" itemscope itemtype="http://data-vocabulary.org/Event">
  <div class="unit size1of7">
  <a href="http://www.meetup.com/45-Not-grumpy-old-Londoners-Love-life-travel-and-culture/events/220945751/" class="list-time unlink omnCamp omngj_sj7eall omnrv_fe1all">

  <time itemprop="startDate" datetime="2015-05-18T15:45:00+01:00">10:45<span class="period">AM</span></time>

  </a>

  </div>
  <div class="unit size4of7">
  <div itemprop="location" itemscope itemtype="http://data-vocabulary.org/Organization">
  <a href="http://www.meetup.com/45-Not-grumpy-old-Londoners-Love-life-travel-and-culture/" class="chapter-name unlink omnCamp omngj_sj7eall omnrv_fe1all" itemprop="url">
  <span itemprop="name">45+ Not grumpy old Londoners! Love life, travel and culture</span>
  </a>
  </div>
  <a href="http://www.meetup.com/45-Not-grumpy-old-Londoners-Love-life-travel-and-culture/events/220945751/" class="big event-title bold unlink-dark wrapNice omnCamp omngj_sj7eall omnrv_fe1all" itemprop="url">
  <span itemprop="summary">Visit FREEMASONS LODGE and interesting afternoon</span>

  </a>

  <div class="list-rsvpers clearfix">

  <div class="attendee-count">
  31


  Friends

  going

  </div>

  </div>
  </div>
  <div class="unit size2of7 friend-container">
  </div>
</li>