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diff --git a/jni/ruby/lib/rdoc/servlet.rb b/jni/ruby/lib/rdoc/servlet.rb
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+require 'rdoc'
+require 'time'
+require 'webrick'
+
+##
+# This is a WEBrick servlet that allows you to browse ri documentation.
+#
+# You can show documentation through either `ri --server` or, with RubyGems
+# 2.0 or newer, `gem server`.  For ri, the server runs on port 8214 by
+# default.  For RubyGems the server runs on port 8808 by default.
+#
+# You can use this servlet in your own project by mounting it on a WEBrick
+# server:
+#
+#   require 'webrick'
+#
+#   server = WEBrick::HTTPServer.new Port: 8000
+#
+#   server.mount '/', RDoc::Servlet
+#
+# If you want to mount the servlet some other place than the root, provide the
+# base path when mounting:
+#
+#   server.mount '/rdoc', RDoc::Servlet, '/rdoc'
+
+class RDoc::Servlet < WEBrick::HTTPServlet::AbstractServlet
+
+  @server_stores = Hash.new { |hash, server| hash[server] = {} }
+  @cache         = Hash.new { |hash, store|  hash[store]  = {} }
+
+  ##
+  # Maps an asset type to its path on the filesystem
+
+  attr_reader :asset_dirs
+
+  ##
+  # An RDoc::Options instance used for rendering options
+
+  attr_reader :options
+
+  ##
+  # Creates an instance of this servlet that shares cached data between
+  # requests.
+
+  def self.get_instance server, *options # :nodoc:
+    stores = @server_stores[server]
+
+    new server, stores, @cache, *options
+  end
+
+  ##
+  # Creates a new WEBrick servlet.
+  #
+  # Use +mount_path+ when mounting the servlet somewhere other than /.
+  #
+  # Use +extra_doc_dirs+ for additional documentation directories.
+  #
+  # +server+ is provided automatically by WEBrick when mounting.  +stores+ and
+  # +cache+ are provided automatically by the servlet.
+
+  def initialize server, stores, cache, mount_path = nil, extra_doc_dirs = []
+    super server
+
+    @cache      = cache
+    @mount_path = mount_path
+    @extra_doc_dirs = extra_doc_dirs
+    @stores     = stores
+
+    @options = RDoc::Options.new
+    @options.op_dir = '.'
+
+    darkfish_dir = nil
+
+    # HACK dup
+    $LOAD_PATH.each do |path|
+      darkfish_dir = File.join path, 'rdoc/generator/template/darkfish/'
+      next unless File.directory? darkfish_dir
+      @options.template_dir = darkfish_dir
+      break
+    end
+
+    @asset_dirs = {
+      :darkfish   => darkfish_dir,
+      :json_index =>
+        File.expand_path('../generator/template/json_index/', __FILE__),
+    }
+  end
+
+  ##
+  # Serves the asset at the path in +req+ for +generator_name+ via +res+.
+
+  def asset generator_name, req, res
+    asset_dir = @asset_dirs[generator_name]
+
+    asset_path = File.join asset_dir, req.path
+
+    if_modified_since req, res, asset_path
+
+    res.body = File.read asset_path
+
+    res.content_type = case req.path
+                       when /css$/ then 'text/css'
+                       when /js$/  then 'application/javascript'
+                       else             'application/octet-stream'
+                       end
+  end
+
+  ##
+  # GET request entry point.  Fills in +res+ for the path, etc. in +req+.
+
+  def do_GET req, res
+    req.path.sub!(/^#{Regexp.escape @mount_path}/o, '') if @mount_path
+
+    case req.path
+    when '/' then
+      root req, res
+    when '/rdoc.css', '/js/darkfish.js', '/js/jquery.js', '/js/search.js',
+         %r%^/images/% then
+      asset :darkfish, req, res
+    when '/js/navigation.js', '/js/searcher.js' then
+      asset :json_index, req, res
+    when '/js/search_index.js' then
+      root_search req, res
+    else
+      show_documentation req, res
+    end
+  rescue WEBrick::HTTPStatus::NotFound => e
+    generator = generator_for RDoc::Store.new
+
+    not_found generator, req, res, e.message
+  rescue WEBrick::HTTPStatus::Status
+    raise
+  rescue => e
+    error e, req, res
+  end
+
+  ##
+  # Fills in +res+ with the class, module or page for +req+ from +store+.
+  #
+  # +path+ is relative to the mount_path and is used to determine the class,
+  # module or page name (/RDoc/Servlet.html becomes RDoc::Servlet).
+  # +generator+ is used to create the page.
+
+  def documentation_page store, generator, path, req, res
+    name = path.sub(/.html$/, '').gsub '/', '::'
+
+    if klass = store.find_class_or_module(name) then
+      res.body = generator.generate_class klass
+    elsif page = store.find_text_page(name.sub(/_([^_]*)$/, '.\1')) then
+      res.body = generator.generate_page page
+    else
+      not_found generator, req, res
+    end
+  end
+
+  ##
+  # Creates the JSON search index on +res+ for the given +store+.  +generator+
+  # must respond to \#json_index to build.  +req+ is ignored.
+
+  def documentation_search store, generator, req, res
+    json_index = @cache[store].fetch :json_index do
+      @cache[store][:json_index] =
+        JSON.dump generator.json_index.build_index
+    end
+
+    res.content_type = 'application/javascript'
+    res.body = "var search_data = #{json_index}"
+  end
+
+  ##
+  # Returns the RDoc::Store and path relative to +mount_path+ for
+  # documentation at +path+.
+
+  def documentation_source path
+    _, source_name, path = path.split '/', 3
+
+    store = @stores[source_name]
+    return store, path if store
+
+    store = store_for source_name
+
+    store.load_all
+
+    @stores[source_name] = store
+
+    return store, path
+  end
+
+  ##
+  # Generates an error page for the +exception+ while handling +req+ on +res+.
+
+  def error exception, req, res
+    backtrace = exception.backtrace.join "\n"
+
+    res.content_type = 'text/html'
+    res.status = 500
+    res.body = <<-BODY
+<!DOCTYPE html>
+<html>
+<head>
+<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
+
+<title>Error - #{ERB::Util.html_escape exception.class}</title>
+
+<link type="text/css" media="screen" href="#{@mount_path}/rdoc.css" rel="stylesheet">
+</head>
+<body>
+<h1>Error</h1>
+
+<p>While processing <code>#{ERB::Util.html_escape req.request_uri}</code> the
+RDoc (#{ERB::Util.html_escape RDoc::VERSION}) server has encountered a
+<code>#{ERB::Util.html_escape exception.class}</code>
+exception:
+
+<pre>#{ERB::Util.html_escape exception.message}</pre>
+
+<p>Please report this to the
+<a href="https://github.com/rdoc/rdoc/issues">RDoc issues tracker</a>.  Please
+include the RDoc version, the URI above and exception class, message and
+backtrace.  If you're viewing a gem's documentation, include the gem name and
+version.  If you're viewing Ruby's documentation, include the version of ruby.
+
+<p>Backtrace:
+
+<pre>#{ERB::Util.html_escape backtrace}</pre>
+
+</body>
+</html>
+    BODY
+  end
+
+  ##
+  # Instantiates a Darkfish generator for +store+
+
+  def generator_for store
+    generator = RDoc::Generator::Darkfish.new store, @options
+    generator.file_output = false
+    generator.asset_rel_path = '..'
+
+    rdoc = RDoc::RDoc.new
+    rdoc.store     = store
+    rdoc.generator = generator
+    rdoc.options   = @options
+
+    @options.main_page = store.main
+    @options.title     = store.title
+
+    generator
+  end
+
+  ##
+  # Handles the If-Modified-Since HTTP header on +req+ for +path+.  If the
+  # file has not been modified a Not Modified response is returned.  If the
+  # file has been modified a Last-Modified header is added to +res+.
+
+  def if_modified_since req, res, path = nil
+    last_modified = File.stat(path).mtime if path
+
+    res['last-modified'] = last_modified.httpdate
+
+    return unless ims = req['if-modified-since']
+
+    ims = Time.parse ims
+
+    unless ims < last_modified then
+      res.body = ''
+      raise WEBrick::HTTPStatus::NotModified
+    end
+  end
+
+  ##
+  # Returns an Array of installed documentation.
+  #
+  # Each entry contains the documentation name (gem name, 'Ruby
+  # Documentation', etc.), the path relative to the mount point, whether the
+  # documentation exists, the type of documentation (See RDoc::RI::Paths#each)
+  # and the filesystem to the RDoc::Store for the documentation.
+
+  def installed_docs
+    extra_counter = 0
+    ri_paths.map do |path, type|
+      store = RDoc::Store.new path, type
+      exists = File.exist? store.cache_path
+
+      case type
+      when :gem then
+        gem_path = path[%r%/([^/]*)/ri$%, 1]
+        [gem_path, "#{gem_path}/", exists, type, path]
+      when :system then
+        ['Ruby Documentation', 'ruby/', exists, type, path]
+      when :site then
+        ['Site Documentation', 'site/', exists, type, path]
+      when :home then
+        ['Home Documentation', 'home/', exists, type, path]
+      when :extra then
+        extra_counter += 1
+        store.load_cache if exists
+        title = store.title || "Extra Documentation"
+        [title, "extra-#{extra_counter}/", exists, type, path]
+      end
+    end
+  end
+
+  ##
+  # Returns a 404 page built by +generator+ for +req+ on +res+.
+
+  def not_found generator, req, res, message = nil
+    message ||= "The page <kbd>#{ERB::Util.h req.path}</kbd> was not found"
+    res.body = generator.generate_servlet_not_found message
+    res.status = 404
+  end
+
+  ##
+  # Enumerates the ri paths.  See RDoc::RI::Paths#each
+
+  def ri_paths &block
+    RDoc::RI::Paths.each true, true, true, :all, *@extra_doc_dirs, &block #TODO: pass extra_dirs
+  end
+
+  ##
+  # Generates the root page on +res+.  +req+ is ignored.
+
+  def root req, res
+    generator = RDoc::Generator::Darkfish.new nil, @options
+
+    res.body = generator.generate_servlet_root installed_docs
+
+    res.content_type = 'text/html'
+  end
+
+  ##
+  # Generates a search index for the root page on +res+.  +req+ is ignored.
+
+  def root_search req, res
+    search_index = []
+    info         = []
+
+    installed_docs.map do |name, href, exists, type, path|
+      next unless exists
+
+      search_index << name
+
+      case type
+      when :gem
+        gemspec = path.gsub(%r%/doc/([^/]*?)/ri$%,
+                            '/specifications/\1.gemspec')
+
+        spec = Gem::Specification.load gemspec
+
+        path    = spec.full_name
+        comment = spec.summary
+      when :system then
+        path    = 'ruby'
+        comment = 'Documentation for the Ruby standard library'
+      when :site then
+        path    = 'site'
+        comment = 'Documentation for non-gem libraries'
+      when :home then
+        path    = 'home'
+        comment = 'Documentation from your home directory'
+      when :extra
+        comment = name
+      end
+
+      info << [name, '', path, '', comment]
+    end
+
+    index = {
+      :index => {
+        :searchIndex     => search_index,
+        :longSearchIndex => search_index,
+        :info            => info,
+      }
+    }
+
+    res.body = "var search_data = #{JSON.dump index};"
+    res.content_type = 'application/javascript'
+  end
+
+  ##
+  # Displays documentation for +req+ on +res+, whether that be HTML or some
+  # asset.
+
+  def show_documentation req, res
+    store, path = documentation_source req.path
+
+    if_modified_since req, res, store.cache_path
+
+    generator = generator_for store
+
+    case path
+    when nil, '', 'index.html' then
+      res.body = generator.generate_index
+    when 'table_of_contents.html' then
+      res.body = generator.generate_table_of_contents
+    when 'js/search_index.js' then
+      documentation_search store, generator, req, res
+    else
+      documentation_page store, generator, path, req, res
+    end
+  ensure
+    res.content_type ||= 'text/html'
+  end
+
+  ##
+  # Returns an RDoc::Store for the given +source_name+ ('ruby' or a gem name).
+
+  def store_for source_name
+    case source_name
+    when 'home' then
+      RDoc::Store.new RDoc::RI::Paths.home_dir, :home
+    when 'ruby' then
+      RDoc::Store.new RDoc::RI::Paths.system_dir, :system
+    when 'site' then
+      RDoc::Store.new RDoc::RI::Paths.site_dir, :site
+    when /^extra-(\d+)$/ then
+      index = $1.to_i - 1
+      ri_dir = installed_docs[index][4]
+      RDoc::Store.new ri_dir, :extra
+    else
+      ri_dir, type = ri_paths.find do |dir, dir_type|
+        next unless dir_type == :gem
+
+        source_name == dir[%r%/([^/]*)/ri$%, 1]
+      end
+
+      raise WEBrick::HTTPStatus::NotFound,
+            "Could not find gem \"#{source_name}\". Are you sure you installed it?" unless ri_dir
+
+      store = RDoc::Store.new ri_dir, type
+
+      return store if File.exist? store.cache_path
+
+      raise WEBrick::HTTPStatus::NotFound,
+            "Could not find documentation for \"#{source_name}\". Please run `gem rdoc --ri gem_name`"
+
+    end
+  end
+
+end
+