Rubyists OPMLの作り方

main.rb

require 'builder'
require 'json'

list = JSON.load_file('list.json')
builder = Builder::XmlMarkup.new
builder.instruct! :xml, :version=>"1.0", :encoding=>"UTF-8"
xml = builder.opml(version: '1.0') do |opml|
  opml.head do |head|
    head.title("This is the title")
    head.dateCreated(Time.now)
    head.dateModified(Time.now)
    head.ownerName("OKURA Masafumi")
  end
  opml.body do |body|
    body.outline(text: 'Rubyists Feed', title: 'Rubyists Feed') do |rubyists_feed|
      list.each do |name, data|
        title = data['title']
        rubyists_feed.outline(text: title, description: title, title: title, type: 'rss', xmlUrl: data['url'], htmlUrl: data['html_link'])
      end
    end
  end
end

File.open('rubyists-feed-opml.xml', 'w') do |f|
  f.puts xml
end

process_list.rb

require 'net/http'
require 'rss'
require 'json'

def from_rss(parsed)
  {
    title: parsed.channel.title,
    updated: nil,
    feed_type: parsed.feed_type,
    html_link: parsed.channel.link,
  }
end

def from_atom(parsed)
  author = parsed.author
  unless author
    author = parsed.entry.author
  end
  title = parsed.title.content
  {
    name: author.name.content,
    email: author.email&.content,
    title: title,
    updated: parsed.updated.content,
    feed_type: parsed.feed_type,
    html_link: parsed.link.href
  }
end

list = File.readlines('list.txt').map do |line|
  line.chomp!
  url, *name = line.split(" ")
  [url, name.join(" ")]
end

# list = [["https://okuramasafumi.hatenablog.jp/rss", "@okuramasafumi"]]

json = {}
list.each do |url, name|
  parsed = RSS::Parser.parse(URI(url))
  data = case parsed
         when RSS::Rss then from_rss(parsed).merge(name: name)
  when RSS::Atom::Feed then from_atom(parsed)
  when nil
    puts "#{url} is probably RDF"
  else
    puts "Unknown feed type #{data.class} from #{url}"
  end
  if data
    data.update(url: url)
    json[name] = data
  end
rescue RSS::NotWellFormedError
  puts "Not valid feed: #{url}"
rescue OpenURI::HTTPError
  puts "Invalid URL: #{url}"
end

File.open('list.json', 'w') do |f|
  JSON.dump(json, f)
end