fetch asciicast from railscast.com

fetch_asciicast.rb

#!/usr/bin/env ruby
##encoding:utf-8
 
require 'open-uri'
require 'nokogiri'
require 'stringio'

def generate_cast_url(link)
  link + "?view=asciicast"
end

def fetch_ascii_content(cast_url)
  cast_content = Nokogiri::HTML(open(cast_url)) 
  cast_content.css('.asciicast').inner_html()
end

def generate_file_name(cast_url)
  cast_url.slice(/\/\d+.*\?/).gsub(/[\/\?]/,'') + '.html'
end
  

def generate_asciicast_doc(link)
  cast_url = generate_cast_url(link)
  file_name = generate_file_name(cast_url)
  content = fetch_ascii_content(cast_url)

  File.open(file_name, "w") do |file|
    file.puts content
  end
end


rss_url = 'http://railscasts.com/subscriptions/WbnCA6UR0xak0TrMUSaGQg/episodes.rss'
rss_doc = Nokogiri::XML(open(rss_url))

rss_doc.css('item link').each do |link|
  generate_asciicast_doc(link.text)
end