Add radius helper method. Tilt supports radius 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

@@ -393,6 +393,24 @@ aufzurufen:
   %h1 Hallo von Haml!
   %p= rdoc(:greetings)
 
+=== Radius-Templates
+
+Das radius gem wird benötigt um Radius-Templates rendern zu können:
+
+  ## radius muss eingebunden werden
+  require 'radius'
+
+  get '/' do
+    radius :index
+  end
+
+Dieser Code rendert <tt>./views/index.radius</tt>.
+
+Da man aus Radius-Templates heraus keine Methoden (abgesehen von +yield+)
+aufrufen kann, will man nahezu in allen Fällen +locals+ übergeben:
+
+  radius :index, :locals => { :key => 'value' }
+
 === Inline-Templates
 
   get '/' do

README.rdoc

@@ -381,6 +381,24 @@ Note that you may also call the rdoc method from within other templates:
   %h1 Hello From Haml!
   %p= rdoc(:greetings)
 
+=== Radius Templates
+
+The radius gem/library is required to render Radius templates:
+
+  ## You'll need to require radius in your app
+  require 'radius'
+
+  get '/' do
+    radius :index
+  end
+
+Renders <tt>./views/index.radius</tt>.
+
+Since you cannot call Ruby methods (except for +yield+) from a Radius
+template, you almost always want to pass locals to it:
+
+  radius :index, :locals => { :key => 'value' }
+
 === Inline Templates
 
   get '/' do

lib/sinatra/base.rb

@@ -351,6 +351,10 @@ module Sinatra
       render :rdoc, template, options, locals
     end
 
+    def radius(template, options={}, locals={})
+      render :radius, template, options, locals
+    end
+
   private
     def render(engine, data, options={}, locals={}, &block)
       # merge app-level options

test/radius_test.rb

@@ -0,0 +1,59 @@
+require File.dirname(__FILE__) + '/helper'
+
+begin
+fail 'Radius broken on 1.9.' if RUBY_VERSION >= '1.9.1'
+require 'radius'
+
+class RadiusTest < Test::Unit::TestCase
+  def radius_app(&block)
+    mock_app do
+      set :views, File.dirname(__FILE__) + '/views'
+      get '/', &block
+    end
+    get '/'
+  end
+
+  it 'renders inline radius strings' do
+    radius_app { radius '<h1>Hiya</h1>' }
+    assert ok?
+    assert_equal "<h1>Hiya</h1>", body
+  end
+
+  it 'renders .radius files in views path' do
+    radius_app { radius :hello }
+    assert ok?
+    assert_equal "<h1>Hello From Radius</h1>\n", body
+  end
+
+  it "renders with inline layouts" do
+    mock_app do
+      layout { "<h1>THIS. IS. <r:yield /></h1>" }
+      get('/') { radius '<EM>SPARTA</EM>' }
+    end
+    get '/'
+    assert ok?
+    assert_equal "<h1>THIS. IS. <EM>SPARTA</EM></h1>", body
+  end
+
+  it "renders with file layouts" do
+    radius_app { radius 'Hello World', :layout => :layout2 }
+    assert ok?
+    assert_equal "<h1>Radius Layout!</h1>\n<p>Hello World</p>\n", body
+  end
+
+  it "raises error if template not found" do
+    mock_app { get('/') { radius :no_such_template } }
+    assert_raise(Errno::ENOENT) { get('/') }
+  end
+  
+  it "allows passing locals" do
+    radius_app do
+      radius '<r:value />', :locals => { :value => 'foo' }
+    end
+    assert ok?
+    assert_equal 'foo', body
+  end
+end
+rescue
+  warn "#{$!.to_s}: skipping radius tests"
+end

test/views/hello.radius

@@ -0,0 +1 @@
+<h1>Hello From Radius</h1>

test/views/layout2.radius

@@ -0,0 +1,2 @@
+<h1>Radius Layout!</h1>
+<p><r:yield /></p>