Read data from githubarchive.org file and process records.

read_activity.rb

require 'open-uri'
require 'zlib'
require 'yajl'

gz = open('http://data.githubarchive.org/2012-03-11-12.json.gz')
js = Zlib::GzipReader.new(gz).read

events = [] # list of each event for the specified date based on predefined event types
Yajl::Parser.parse(js) do |event|
  # puts event <-- not particularly useful in demoing how to actually see the data
  events << event
end

events_hash = {}
Yajl::Parser.parse(js) do |event|
  key = event["type"]
  if events_hash[key].nil?
    events_hash[key] = []
  end
  events_hash[key] << event
end