This will go through all the gifs for the past year in one campfire room (back to the first of the current year) and calculate the most commonly posted gifs. It does this by grabbing the URL of the gif, getting the data and MD5ing it for comparison.

top_gifs.rb

#!/usr/bin/env ruby
 
require 'rubygems'
require 'set'
require 'digest/md5'
require 'open-uri'
require 'tinder'
require 'active_support/all'
require 'awesome_print'
 
class CampfireGifCounter
  attr_reader :campfire, :room, :results
 
  def initialize(subdomain, token, room)
    @campfire = Tinder::Campfire.new subdomain, :token => token
    @room = campfire.find_room_by_name(room)
    @results = {}
  end
 
  def top_gifs
    find_gifs
    results.sort_by{|k,v| v[:count] }.reverse.take(25)
  end
 
  private
 
  def find_gifs
    @results = {}
    (Date.today.beginning_of_year..Date.today).each do |date|
      gifs_for_date(date).each {|m|
        digest = existing_digest_for_url?(m[:message])
        if digest
          append_to_existing_digest(digest, m[:message])
        else
          digest = md5_url(m[:message])
          if digest && results[digest]
            append_to_existing_digest(digest, m[:message])
          elsif digest
            create_new_digest_entry(digest, m[:message])
          end
        end
      }
    end
  end
 
  def gifs_for_date(date)
    ap date
    room.transcript(date).select do |m|
      m[:message] =~ /\Ahttps?\:\/\/.+\.gif/
    end
  end
 
  def md5_url(url)
    Digest::MD5.digest(open(url).read) rescue nil
  end
 
  def create_new_digest_entry(digest, url)
    results[digest] = {
      :urls => Set.new([url]),
      :count => 1
    }
  end
 
  def append_to_existing_digest(digest, url)
    results[digest][:count] += 1
    results[digest][:urls] << url
  end
 
  def existing_digest_for_url?(url)
    results.each do |digest, data|
      return digest if data[:urls].include?(url)
    end
    return false
  end
end
 
gif_counter = CampfireGifCounter.new('SUBDOMAIN', 'TOKEN', "ROOM NAME")
 
ap gif_counter.top_gifs