parse-rss-xml.rb

require 'nokogiri'
require 'json'

def parse_rss_xml(file_name)
  file = File.read file_name
  doc = Nokogiri.XML file

  to_info = -> rss {
    title    = rss.attr 'title'
    html_url = rss.attr 'htmlUrl'
    xml_url  = rss.attr 'xmlUrl'
    {title: title, html_url: html_url, xml_url: xml_url}
  }

  root_elements = doc.css 'body > outline'
  groups = root_elements.group_by {|elm| elm.attr('type') == 'rss' }


  categories = groups[false]
  rss_table = categories.each_with_object({}) { |categorie_root, acc|
    name = categorie_root.attr 'title'
    rss_list = categorie_root.css('outline[type=rss]')
    acc[name] = rss_list.map &to_info
  }

  uncategorized_rss_list = groups[true]
  rss_table['__uncategorized-rss-list'] = uncategorized_rss_list.map &to_info

  rss_table
end

file = File.read 'subscriptions.xml'

if __FILE__ == $0
  file_name = ARGV[0] || 'subscriptions.xml'
  rss_table = parse_rss_xml file_name

  puts rss_table.to_json(
    indent: '  ',
    object_nl: "\n",
    space: ' ',
  )

end