cal.rb

require 'kramdown'
require 'nokogiri'
require 'chronic'

# gem install kramdown nokogiri chronic
# put this in ~/dev/openhack.github.com/cal.rb
# cd ~/dev/openhack.github.com
# ruby cal.rb

Dir['*/*.markdown'].each do |filename|
  markdown = File.read(filename)
  html = Kramdown::Document.new(markdown).to_html
  city_name = Nokogiri::HTML.parse(html).css("h2").text
  meetup_candidates = Nokogiri::HTML.parse(html).css("h3#next-meetups + *")

  meetup_links = meetup_candidates.css('a').map { |link|
    if date = Chronic.parse(link.text)
      "* #{date}: #{link['href']}"
    end
  }.compact

  puts "In #{city_name}:"
  if meetup_links.any?
    puts meetup_links
  else
    puts "No upcoming meetups found"
  end

  puts
end

__END__

Best cases have h3#next-meetups followed by 1..* of links in the form of:
<a href="some-rsvp-url">recognizable-date-format</a>.

Ideally we'd go through the non-confirming pages and tidy/garden them to follow
the same format, then recommend this format.

Note that some locations (e.g. kontich) have non-english date names, so be
aware if we're parsing with e.g. Chronic gem.

Alternatively, we could support a wide variety of formats, but I think that's
too fragile.  I looked at each page and noted other cases:

* Has h3 + datelink, but h3 id is different (pittsburgh)
* Has h3 but no link, or link doesn not contain date (birmingham, iowa_city, newcastle_upon_tyne):
* Has h3 but a meetup link (chicago, green_bay, taipei):
* Has h3 but text about recurring meetup: (columbus)
* Lacks h3 but has meetup/etc link: (new_york)
* Very freeform (houghton)

output

[master][~/dev/openhack.github.com] ruby cal.rb 
In License:
No upcoming meetups found

In Atlanta, GA:
No upcoming meetups found

In Austin, TX:
No upcoming meetups found

In Baltimore:
No upcoming meetups found

In 北京 (Beijing), China:
No upcoming meetups found

In Birmingham, AL:
No upcoming meetups found

In Boston:
* 2012-12-20 12:00:00 -0800: https://guestlistapp.com/events/138702

In Buffalo, NY:
* 2013-01-15 12:00:00 -0800: http://www.meetup.com/Western-New-York-Ruby/events/dfqlpdyrcbtb/
* 2013-01-29 12:00:00 -0800: http://www.meetup.com/Western-New-York-Ruby/events/dfqlpdyrcbmc/

In Chicago:
No upcoming meetups found

In Columbia:
No upcoming meetups found

In Columbus:
No upcoming meetups found

In Fort Wayne, IN:
No upcoming meetups found

In Green Bay:
No upcoming meetups found

In Honolulu, HI - Paradise Hackers:
No upcoming meetups found

In Houghton, MI:
No upcoming meetups found

In Iowa City, IA:
No upcoming meetups found

In Istanbul, Turkey:
No upcoming meetups found

In Jersey City:
No upcoming meetups found

In Kontich, Belgium:
No upcoming meetups found

In Logan, UT:
No upcoming meetups found

In Louisville, KY:
* 2013-01-01 12:00:00 -0800: http://openhack_lvl.eventbrite.com
* 2013-01-12 12:00:00 -0800: http://openhack_lvl_weekend.eventbrite.com
* 2013-02-05 12:00:00 -0800: http://openhack_lvl.eventbrite.com
* 2013-02-16 12:00:00 -0800: http://openhack_lvl_weekend.eventbrite.com

In Miami, FL:
* 2013-01-14 12:00:00 -0800: http://www.meetup.com/miamirb/events/98921162/
* 2013-01-28 12:00:00 -0800: http://www.meetup.com/miamirb/events/98921402/

In New York:
No upcoming meetups found

In Newcastle upon Tyne, UK:
No upcoming meetups found

In Pittsburgh:
No upcoming meetups found

In Providence:
No upcoming meetups found

In Rochester, NY:
* 2013-01-30 12:00:00 -0800: http://nextplex.com/rochester-ny/calendar/events/1369-openhack-rochester

In Santa Barbara, CA:
No upcoming meetups found

In Taipei, Taiwan:
No upcoming meetups found

In Toledo, OH:
No upcoming meetups found

In Toronto:
No upcoming meetups found

In Tulsa, OK:
No upcoming meetups found

In Vancouver, BC:
No upcoming meetups found

In Waterloo, ON:
No upcoming meetups found

In Windsor, ON:
No upcoming meetups found

In Your City?:
No upcoming meetups found