Added Less support

Signed-off-by: Simon Rozet <simon@rozet.name>

README.rdoc

@@ -203,6 +203,20 @@ and overridden on an individual basis.
     sass :stylesheet, :style => :expanded # overridden
   end
 
+=== Less Templates
+
+The less gem/library is required to render Less templates:
+
+  ## You'll need to require less in your app
+  require 'less'
+
+  get '/stylesheet.css' do
+    content_type 'text/css', :charset => 'utf-8'
+    less :stylesheet
+  end
+
+Renders <tt>./views/stylesheet.less</tt>.
+
 === Inline Templates
 
   get '/' do

lib/sinatra/base.rb

@@ -284,7 +284,7 @@ module Sinatra
   #
   # Possible options are:
   #   :layout       If set to false, no layout is rendered, otherwise
-  #                 the specified layout is used (Ignored for `sass`)
+  #                 the specified layout is used (Ignored for `sass` and `less`)
   #   :locals       A hash with local variables that should be available
   #                 in the template
   module Templates
@@ -304,6 +304,11 @@ module Sinatra
       options[:layout] = false
       render :sass, template, options, locals
     end
+    
+    def less(template, options={}, locals={})
+      options[:layout] = false
+      render :less, template, options, locals
+    end
 
     def builder(template=nil, options={}, locals={}, &block)
       options, template = template, nil if template.is_a?(Hash)

sinatra.gemspec

@@ -38,6 +38,7 @@ Gem::Specification.new do |s|
     test/haml_test.rb
     test/helper.rb
     test/helpers_test.rb
+    test/less_test.rb
     test/mapped_error_test.rb
     test/middleware_test.rb
     test/public/favicon.ico
@@ -64,6 +65,7 @@ Gem::Specification.new do |s|
     test/views/hello.haml
     test/views/hello.sass
     test/views/hello.test
+    test/views/hello.less
     test/views/layout2.builder
     test/views/layout2.erb
     test/views/layout2.erubis
@@ -81,6 +83,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'haml'
   s.add_development_dependency 'builder'
   s.add_development_dependency 'erubis'
+  s.add_development_dependency 'less'
 
   s.has_rdoc = true
   s.homepage = "http://sinatra.rubyforge.org"

test/less_test.rb

@@ -0,0 +1,37 @@
+require File.dirname(__FILE__) + '/helper'
+require 'less'
+
+class LessTest < Test::Unit::TestCase
+  def less_app(&block)
+    mock_app {
+      set :views, File.dirname(__FILE__) + '/views'
+      get '/', &block
+    }
+    get '/'
+  end
+  
+  it 'renders inline Less strings' do
+    less_app { less "@white_color: #fff; #main { background-color: @white_color }"}
+    assert ok?
+    assert_equal "#main { background-color: #ffffff; }\n", body
+  end
+  
+  it 'renders .less files in views path' do
+    less_app { less :hello }
+    assert ok?
+    assert_equal "#main { background-color: #ffffff; }\n", body
+  end
+  
+  it 'ignores the layout option' do
+    less_app { less :hello, :layout => :layout2 }
+    assert ok?
+    assert_equal "#main { background-color: #ffffff; }\n", body
+  end
+  
+  it "raises error if template not found" do
+    mock_app {
+      get('/') { less :no_such_template }
+    }
+    assert_raise(Errno::ENOENT) { get('/') }
+  end
+end

test/views/hello.less

@@ -0,0 +1,5 @@
+@white_colour: #fff;
+
+#main {
+	background-color: @white_colour;
+}