#!/usr/bin/ruby
require 'nokogiri'
require 'open-uri'
require 'rss'

debug = true if ARGV[0] == "-d"

url = 'http://www.st.ryukoku.ac.jp/~kjm/security/memo/'
url = './index.html' if debug
puts "opening #{url}" if debug
doc = Nokogiri::HTML(open(url))

### FIXME: any better ways there?
doc.css('a[href^="/~kjm/"]').each do |anc|
  anc['href'] = 'http://www.st.ryukoku.ac.jp' + anc['href']
  puts "prefixed: #{anc['href']}" if debug
end

### Which version should we use?
rss = RSS::Maker.make("2.0") do |xml|
  xml.channel.title = doc.title
  xml.channel.link = url
  xml.channel.description = doc.css('div.NORMAL').first.children
  p xml.channel if debug

  doc.css('a.NU').each do |link|
    next if link.parent.name == "h2"
    puts "processing: #{link}" if debug
    i = xml.items.new_item
    ### a"》", span" ", content
    i.title = link.next.next.content
    i.link = link['href']
    if link.parent.name == "p"
      ### Normal short items
      i.description = link.parent.parent.children
    elsif link.parent.name == "h3"
      ### "various", "tuiki" etc
      i.description = link.parent.next.next
    else
      i.description = "Something wrong"
    end
    i.date = Time.parse(/#([0-9]{8})/.match(link['href'])[1])

    if debug
      puts " #{link.parent.name}:	Title: #{i.title}"
      puts "	Link: #{i.link}"
      puts "	Date: #{i.date}"
      puts "" ### description is too long to put here
    end
  end

  ### TTL depends on your cron settings
  xml.channel.ttl = "60" ### (in minutes)
end

### Lazy: should check before writing
File.open("shm.rss", "w") do |f|
  f.write(rss.to_s)
end