Add rdoc helper method. Tilt supports RDoc for quite some time now, but it was not as easy to use as haml or erb, and not documented. Tests and documentation (English and German) included.

README.de.rdoc

@@ -368,6 +368,31 @@ aufzurufen:
   %h1 Hallo von Haml!
   %p= textile(:greetings)
 
+=== RDoc-Templates
+
+Das rdoc gem wird benötigt um RDoc-Templates rendern zu können:
+
+  ## redcloth muss eingebunden werden
+  require "rdoc"
+
+  get '/' do
+    rdoc :index
+  end
+
+Dieser Code rendert <tt>./views/index.rdoc</tt>.
+
+Da es weder möglich ist Methoden aufzurufen, noch +locals+ zu übergeben, ist
+es am sinnvollsten RDoc in Kombination mit einer anderen Template-Engine
+zu nutzen:
+
+  erb :overview, :locals => { :text => rdoc(:introduction) }
+
+Es ist auch möglich die +rdoc+ Methode aus anderen Templates heraus
+aufzurufen:
+
+  %h1 Hallo von Haml!
+  %p= rdoc(:greetings)
+
 === Inline-Templates
 
   get '/' do

README.rdoc

@@ -359,6 +359,28 @@ Note that you may also call the textile method from within other templates:
   %h1 Hello From Haml!
   %p= textile(:greetings)
 
+=== RDoc Templates
+
+The RDoc gem/library is required to render RDoc templates:
+
+  ## You'll need to require rdiscount in your app
+  require "rdoc"
+
+  get '/' do
+    rdoc :index
+  end
+
+Renders <tt>./views/index.rdoc</tt>.
+
+It is not possible to call methods from rdoc, nor to pass locals to it. You therefore will usually use it in combination with another rendering engine:
+
+  erb :overview, :locals => { :text => rdoc(:introduction) }
+
+Note that you may also call the rdoc method from within other templates:
+
+  %h1 Hello From Haml!
+  %p= rdoc(:greetings)
+
 === Inline Templates
 
   get '/' do

lib/sinatra/base.rb

@@ -347,6 +347,10 @@ module Sinatra
       render :textile, template, options, locals
     end
 
+    def rdoc(template, options={}, locals={})
+      render :rdoc, template, options, locals
+    end
+
   private
     def render(engine, data, options={}, locals={}, &block)
       # merge app-level options

test/rdoc_test.rb

@@ -0,0 +1,34 @@
+require File.dirname(__FILE__) + '/helper'
+
+begin
+require 'rdoc'
+
+class RdocTest < Test::Unit::TestCase
+  def rdoc_app(&block)
+    mock_app do
+      set :views, File.dirname(__FILE__) + '/views'
+      get '/', &block
+    end
+    get '/'
+  end
+
+  it 'renders inline rdoc strings' do
+    rdoc_app { rdoc '= Hiya' }
+    assert ok?
+    assert_equal "<h1>Hiya</h1>\n", body
+  end
+
+  it 'renders .rdoc files in views path' do
+    rdoc_app { rdoc :hello }
+    assert ok?
+    assert_equal "<h1>Hello From RDoc</h1>\n", body
+  end
+
+  it "raises error if template not found" do
+    mock_app { get('/') { rdoc :no_such_template } }
+    assert_raise(Errno::ENOENT) { get('/') }
+  end
+end
+rescue
+  warn "#{$!.to_s}: skipping rdoc tests"
+end

test/views/hello.rdoc

@@ -0,0 +1 @@
+= Hello From RDoc