jsonfeed_convert_rss.rb

# run with: ruby jsonfeed_convert_rss.rb "http://therecord.co/xml/rss.xml"
# also make sure to "gem install simple-rss" first

require 'rubygems'
require 'simple-rss'
require 'open-uri'
require 'json'

rss_url = ARGV[0]

SimpleRSS.item_tags << :"enclosure#url"
SimpleRSS.item_tags << :"enclosure#type"
SimpleRSS.item_tags << :"enclosure#length"

rss = SimpleRSS.parse(open(rss_url))

json_feed = {
  version: "https://jsonfeed.org/version/1",
  title: rss.channel.title,
  home_page_url: rss.channel.link,
  items: []
}

for rss_item in rss.items
  json_item = {
    id: rss_item.link,
    url: rss_item.link,
    title: rss_item.title.force_encoding('UTF-8'),
    date_published: rss_item.pubDate.iso8601
  }

  if rss_item.description.to_s.length > 0
    json_item[:content_text] = CGI.unescapeHTML(rss_item.description.force_encoding('UTF-8'))
  end
  
  if rss_item.content_encoded.to_s.length > 0
    json_item[:content_html] = CGI.unescapeHTML(rss_item.content_encoded.force_encoding('UTF-8'))
  elsif rss_item.content.to_s.length > 0
    json_item[:content_html] = CGI.unescapeHTML(rss_item.content.force_encoding('UTF-8'))
  end

  if rss_item.enclosure_url
    json_item[:attachments] = [
      {
        url: rss_item.enclosure_url,
        mime_type: rss_item.enclosure_type,
        size_in_bytes: rss_item.enclosure_length.to_i
      }
    ]
  end

  json_feed[:items] << json_item
end

puts JSON.pretty_generate(json_feed)