[Sass] Provide access to the Sass::Engine options from the Sass::Environment and during Sass function evaluation. This enables some cleverness to occur during compilation.

lib/sass/engine.rb

@@ -94,7 +94,7 @@ module Sass
         :load_paths => ['.']
       }.merge! options
       @template = template
-      @environment = Environment.new
+      @environment = Environment.new(nil, @options)
       @environment.set_var("important", Script::String.new("!important"))
     end
 

lib/sass/environment.rb

@@ -2,10 +2,15 @@ module Sass
   class Environment
     attr_reader :parent
 
-    def initialize(parent = nil)
+    def initialize(parent = nil, options = nil)
       @vars = {}
       @mixins = {}
       @parent = parent
+      @options = options
+    end
+
+    def options
+      @options || (parent && parent.options) || {}
     end
 
     def self.inherited_hash(name)

lib/sass/script/funcall.rb

@@ -1,6 +1,18 @@
+require File.join(File.dirname(__FILE__), 'functions')
 module Sass
   module Script
     class Funcall # :nodoc:
+      class EvaluationContext # :nodoc:
+
+        include Sass::Script::Functions
+
+        attr_reader :options
+
+        def initialize(options)
+          @options = options
+        end
+      end
+
       attr_reader :name, :args
 
       def initialize(name, args)
@@ -18,7 +30,7 @@ module Sass
           return Script::String.new("#{name}(#{args.map {|a| a.perform(environment)}.join(', ')})")
         end
 
-        return Functions.send(name, *args)
+        return EvaluationContext.new(environment.options).send(name, *args)
       rescue ArgumentError => e
         raise e unless e.backtrace.first =~ /:in `(#{name}|perform)'$/
         raise Sass::SyntaxError.new("#{e.message} for `#{name}'")

lib/sass/script/functions.rb

@@ -19,6 +19,9 @@ module Sass::Script
   # and then left as static CSS files.
   # Any dynamic CSS should be left in <style> tags in the HTML.
   #
+  # Within a sass function you can call the options method to gain access to the
+  # options hash that was used to create the Sass::Engine that is processing the function call.
+  #
   # The following functions are provided:
   # * +hsl+ - converts an <tt>hsl(hue, saturation, lightness)</tt> triplet into a color.
   #

test/sass/functions_test.rb

@@ -96,7 +96,7 @@ class SassFunctionTest < Test::Unit::TestCase
   end
 
   def evaluate(value)
-    Sass::Script::Parser.parse(value, 0, 0).perform({}).to_s
+    Sass::Script::Parser.parse(value, 0, 0).perform(Sass::Environment.new).to_s
   end
 
   def assert_error_message(message, value)