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lib/rake-pipeline/middleware.rb

@@ -19,9 +19,9 @@ class Middleware
       # @param [#call] app a Rack application
       # @param [String|Rake::Pipeline] pipeline either a path to an
       #   Assetfile to use to build a pipeline, or an existing pipeline.
-      def initialize(app, pipeline)
+      def initialize(app, pipeline, &defaults)
         @app = app
-        @project = Rake::Pipeline::Project.new(pipeline)
+        @project = Rake::Pipeline::Project.new(pipeline, &defaults)
       end
 
       # Automatically compiles your assets if required and

lib/rake-pipeline/project.rb

@@ -27,6 +27,8 @@ class Project
       #   write their outputs by default
       attr_reader :default_output_root
 
+      attr_reader :defaults
+
       # @return [Array] a list of filters to be applied before
       #   the specified filters in every pipeline
       attr_writer :before_filters
@@ -86,14 +88,17 @@ def add_to_digest(str)
       # @param [String|Pipeline] assetfile_or_pipeline
       #   if this a String, create a Pipeline from the Assetfile at
       #   that path. If it's a Pipeline, just wrap that pipeline.
-      def initialize(assetfile_or_pipeline=nil)
+      def initialize(assetfile_or_pipeline=nil, &defaults)
         reset!
+
         if assetfile_or_pipeline.kind_of?(String)
           @assetfile_path = File.expand_path(assetfile_or_pipeline)
-          rebuild_from_assetfile(@assetfile_path)
+          @defaults = defaults
+          rebuild_from_assetfile(@assetfile_path, &defaults)
         elsif assetfile_or_pipeline
           @pipelines << assetfile_or_pipeline
         end
+
       end
 
       # Evaluate a block using the Rake::Pipeline::DSL::ProjectDSL
@@ -113,7 +118,7 @@ def invoke
           if assetfile_path
             source = File.read(assetfile_path)
             if digest(source) != assetfile_digest
-              rebuild_from_assetfile(assetfile_path, source)
+              rebuild_from_assetfile(assetfile_path, source, &defaults)
             end
           end
 
@@ -241,12 +246,15 @@ def reset!
       #   evaluated instead of reading the file at assetfile_path.
       #
       # @return [void]
-      def rebuild_from_assetfile(path, source=nil)
+      def rebuild_from_assetfile(path, source=nil, &default_config)
         reset!
         source ||= File.read(path)
         @assetfile_digest = digest(source)
         @assetfile_path = path
-        build { instance_eval(source, path, 1) }
+        build do
+          instance_eval &default_config if block_given?
+          instance_eval(source, path, 1)
+        end
       end
 
       # Setup the pipeline so its output files will be up to date.