[Sass] Fix a bug that caused the Sass::Engine options to not get passed to the stylesheet environment.

lib/sass/tree/node.rb

@@ -149,7 +149,6 @@ module Sass
       # @raise [Sass::SyntaxError] if some element of the tree is invalid
       # @see Sass::Tree
       def perform(environment)
-        environment.options = @options if self.class == Tree::Node
         _perform(environment)
       rescue Sass::SyntaxError => e
         e.modify_backtrace(:filename => filename, :line => line)

lib/sass/tree/root_node.rb

@@ -22,7 +22,8 @@ module Sass
       end
 
       # @see \{Node#perform}
-      def perform(*args)
+      def perform(environment)
+        environment.options = @options if environment.options.nil? || environment.options.empty?
         super
       rescue Sass::SyntaxError => e
         e.sass_template = @template

test/sass/engine_test.rb

@@ -967,6 +967,16 @@ a
 SASS
   end
 
+  def test_options_available_in_environment
+    assert_equal(<<CSS, render(<<SASS))
+a {
+  b: nested; }
+CSS
+a
+  b= option("style")
+SASS
+  end
+
   # Encodings
 
   unless Haml::Util.ruby1_8?

test/test_helper.rb

@@ -9,6 +9,12 @@ require 'sass'
 
 Sass::RAILS_LOADED = true unless defined?(Sass::RAILS_LOADED)
 
+module Sass::Script::Functions
+  def option(name)
+    Sass::Script::String.new(@options[name.value.to_sym].to_s)
+  end
+end
+
 class Test::Unit::TestCase
   def munge_filename(opts)
     return if opts[:filename]