New APIs for dealing with configuration changes and accessing a compi…

…ler instance.

lib/compass.rb

@@ -17,6 +17,6 @@ def lib_directory
   module_function :base_directory, :lib_directory
 end
 
-%w(configuration frameworks app_integration).each do |lib|
+%w(configuration frameworks app_integration actions compiler).each do |lib|
   require "compass/#{lib}"
 end

lib/compass/compiler.rb

@@ -58,6 +58,13 @@ def new_config?
       nil
     end
 
+    def clean!
+      FileUtils.rm_rf options[:cache_location]
+      css_files.each do |css_file|
+        FileUtils.rm_f css_file
+      end
+    end
+
     def run
       if new_config?
         # Wipe out the cache and force compilation if the configuration has changed.

lib/compass/configuration/adapters.rb

@@ -3,7 +3,7 @@ module Configuration
     # The adapters module provides methods that make configuration data from a compass project
     # adapt to various consumers of configuration data
     module Adapters
-      def to_compiler_arguments(additional_options)
+      def to_compiler_arguments(additional_options = {})
         [project_path, sass_path, css_path, to_sass_engine_options.merge(additional_options)]
       end
 

lib/compass/configuration/helpers.rb

@@ -112,6 +112,15 @@ def detect_configuration_file(project_path = nil)
         possible_files.detect{|f| File.exists?(f)}
       end
 
+      def handle_configuration_change!
+        if (compiler = Compass.compiler).new_config?
+          compiler.clean!
+        end
+      end
+
+      def compiler
+        Compass::Compiler.new(*Compass.configuration.to_compiler_arguments)
+      end
     end
   end