module Docs  class Nix < UrlScraper    self.type = 'simple'    self.release = '2.11.0'    self.base_url = 'https://nixos.org/manual/'    self.root_path = 'nix/stable/expressions/builtins.html'    self.initial_paths = %w(      nix/stable/expressions/builtins.html      nixpkgs/stable/index.html)    self.links = {      home: 'https://nixos.org/',      code: 'https://github.com/NixOS/nix'    }     html_filters.push 'nix/clean_html', 'nix/entries'     options[:skip_links] = true     options[:attribution] = <<-HTML      &copy; 2022 NixOS Contributors<br>      Licensed under the LGPL License.    HTML     def get_latest_version(opts)      doc = fetch_doc('https://nixos.org/manual/nix/stable/', opts)      doc.at_css('a.active')['href'].scan(/([0-9.]+)/)[0][0]    end  endend