Sample of getting gists which is newly added since last time fetched.

gist.rb

#!/usr/bin/env ruby

class Gist
  attr_reader :last

  def initialize
    require 'rest-client'
    require 'date'
    @token = "token <your_token_here>"
    @user = '<username>'
    @url = "https://api.github.com/users/#{@user}/gists"
    @p = {:Authorization => @token}
    @ts = DateTime.parse(open('/tmp/last.ts', 'r'){|f| f.read})
  end

  def update_ts
    open('/tmp/last.ts', 'w'){|f| f.puts DateTime.now.new_offset(0)}
  end

  def get_gists_pretty
    r = RestClient.get(@url, @p)
    json = JSON.parse(r)
    JSON.pretty_generate(json)
  end

  def get_new_gist
    r = RestClient.get(@url, @p)
    new_gist = JSON.parse(r).select{|g| @ts < Date.parse(g['updated_at'])}
    new_gist.collect{|ng| ng['files'].values}[0]
  end
end

g = Gist.new
g.get_new_gist.each{|hash|
  if hash['language'] == 'Markdown'
    r = RestClient.get(hash['raw_url'])
    open(hash['filename'], 'w'){|f|
      f.puts r
    }
  end
}