Noosfero/noosfero

class FeedWriter
  include Rails.application.routes.url_helpers

  def write(articles, options = {})
    result = ""
    xml = Builder::XmlMarkup.new(target: result)

    xml.instruct! :xml, version: "1.0"
    xml.rss(version: "2.0") do
      xml.channel do
        xml.title(options[:title] || _("Feed"))
        if options[:link]
          xml.link(options[:link])
        end
        if options[:description]
          xml.description(options[:description])
        end
        for article in articles
          article = FilePresenter.for article
          xml.item do
            xml.title(article.title)
            desc = article.to_html
            desc = article.abstract if desc.is_a? Proc
            xml.description(desc)
            if article.created_at
              # rfc822
              xml.pubDate(article.created_at.rfc2822)
            end
            # link to article
            xml.link(url_for(article.url))
            xml.guid(url_for(article.url))
            if article.filename
              url = url_for(article.url.merge(download: true))
              length = article.size
              type = article.mime_type
              xml.enclosure(nil, url: url, length: length, type: type)
            end
          end
        end
      end
    end

    result
  end
end