Add support for wlang templating engine.

Gemfile

@@ -42,6 +42,7 @@ gem 'maruku'
 gem 'creole'
 gem 'markaby'
 gem 'radius'
+gem 'wlang', '>= 2.0.1'
 
 if RUBY_ENGINE == 'jruby'
   gem 'nokogiri', '!= 1.5.0'

lib/sinatra/base.rb

@@ -645,6 +645,10 @@ module Sinatra
       render :creole, template, options, locals
     end
 
+    def wlang(template, options={}, locals={})
+      render :wlang, template, options, locals
+    end
+
     def yajl(template, options={}, locals={})
       options[:default_content_type] = :json
       render :yajl, template, options, locals

test/views/hello.wlang

@@ -0,0 +1 @@
+Hello from wlang!

test/views/layout2.wlang

@@ -0,0 +1,2 @@
+WLang Layout!
++{yield}

test/wlang_test.rb

@@ -0,0 +1,64 @@
+require File.expand_path('../helper', __FILE__)
+require 'wlang'
+
+class WLangTest < Test::Unit::TestCase
+  def engine
+    Tilt::WLangTemplate
+  end
+
+  def wlang_app(&block)
+    mock_app {
+      set :views, File.dirname(__FILE__) + '/views'
+      get '/', &block
+    }
+    get '/'
+  end
+
+  it 'uses the correct engine' do
+    assert_equal engine, Tilt[:wlang]
+  end
+
+  it 'renders .wlang files in views path' do
+    wlang_app { wlang :hello }
+    assert ok?
+    assert_equal "Hello from wlang!\n", body
+  end
+
+  it 'renders in the app instance scope' do
+    mock_app do
+      helpers do
+        def who; "world"; end
+      end
+      get('/') { wlang 'Hello +{who}!' }
+    end
+    get '/'
+    assert ok?
+    assert_equal 'Hello world!', body
+  end
+
+  it 'takes a :locals option' do
+    wlang_app do
+      locals = {:foo => 'Bar'}
+      wlang 'Hello ${foo}!', :locals => locals
+    end
+    assert ok?
+    assert_equal 'Hello Bar!', body
+  end
+
+  it "renders with inline layouts" do
+    mock_app do
+      layout { 'THIS. IS. +{yield.upcase}!' }
+      get('/') { wlang 'Sparta' }
+    end
+    get '/'
+    assert ok?
+    assert_equal 'THIS. IS. SPARTA!', body
+  end
+
+  it "renders with file layouts" do
+    wlang_app { wlang 'Hello World', :layout => :layout2 }
+    assert ok?
+    assert_body "WLang Layout!\nHello World"
+  end
+
+end