Add coffee helper method. Tilt supports CoffeeScript again, but it was not as easy to use as sass or scss, and not documented. Tests and documentation (English and German) included.

README.de.rdoc

@@ -424,6 +424,19 @@ Das markaby gem wird benötigt um Markaby-Templates rendern zu können:
 
 Dieser Code rendert <tt>./views/index.mab</tt>.
 
+=== CoffeScript-Templates
+
+Das coffee-script gem und das `coffee`-Programm werden benötigt um CoffeScript-Templates rendern zu können:
+
+  ## coffee-script muss eingebunden werden
+  require 'coffee-script'
+
+  get '/application.js' do
+    coffee :application
+  end
+
+Dieser Code rendert <tt>./views/application.coffee</tt>.
+
 === Inline-Templates
 
   get '/' do

README.rdoc

@@ -412,6 +412,21 @@ The markaby gem/library is required to render Markaby templates:
 
 Renders <tt>./views/index.mab</tt>.
 
+=== CoffeeScript Templates
+
+The coffee-script gem/library and the `coffee` binary are required to render
+CoffeeScript templates:
+
+  ## You'll need to require coffee-script in your app
+  require 'coffee-script'
+
+  get '/application.js' do
+    content_type 'text/javascript', :charset => 'utf-8'
+    coffee :application
+  end
+
+Renders <tt>./views/application.coffee</tt>.
+
 === Inline Templates
 
   get '/' do

lib/sinatra/base.rb

@@ -359,6 +359,11 @@ module Sinatra
       render :mab, template, options, locals
     end
 
+    def coffee(template, options={}, locals={})
+      options[:layout] = false
+      render :coffee, template, options, locals
+    end
+
   private
     def render(engine, data, options={}, locals={}, &block)
       # merge app-level options

test/coffee_test.rb

@@ -0,0 +1,64 @@
+require File.dirname(__FILE__) + '/helper'
+
+begin
+require 'coffee-script'
+
+class CoffeeTest < Test::Unit::TestCase
+  def coffee_app(&block)
+    mock_app {
+      set :views, File.dirname(__FILE__) + '/views'
+      get '/', &block
+    }
+    get '/'
+  end
+
+  it 'renders inline Coffee strings' do
+    coffee_app { coffee "alert 'Aye!'\n" }
+    assert ok?
+    assert_equal "(function() {\n  alert('Aye!');\n})();\n", body
+  end
+
+  it 'renders .coffee files in views path' do
+    coffee_app { coffee :hello }
+    assert ok?
+    assert_equal "(function() {\n  alert(\"Aye!\");\n})();\n", body
+  end
+
+  it 'ignores the layout option' do
+    coffee_app { coffee :hello, :layout => :layout2 }
+    assert ok?
+    assert_equal "(function() {\n  alert(\"Aye!\");\n})();\n", body
+  end
+
+  it "raises error if template not found" do
+    mock_app {
+      get('/') { coffee :no_such_template }
+    }
+    assert_raise(Errno::ENOENT) { get('/') }
+  end
+
+  it "passes coffee options to the coffee engine" do
+    coffee_app {
+      coffee "alert 'Aye!'\n",
+        :no_wrap => true
+    }
+    assert ok?
+    assert_equal "alert('Aye!');", body
+  end
+
+  it "passes default coffee options to the coffee engine" do
+    mock_app {
+      set :coffee, :no_wrap => true # default coffee style is :nested
+      get '/' do
+        coffee "alert 'Aye!'\n"
+      end
+    }
+    get '/'
+    assert ok?
+    assert_equal "alert('Aye!');", body
+  end
+end
+
+rescue
+  warn "#{$!.to_s}: skipping coffee tests"
+end

test/views/hello.coffee

@@ -0,0 +1 @@
+alert "Aye!"