make assets a core ext

lib/middleman/core_extensions/assets.rb

@@ -0,0 +1,54 @@
+module Middleman::CoreExtensions::Assets
+  class << self
+    def registered(app)
+      app.extend ClassMethods
+      
+      app.helpers Helpers
+      
+      app.register_asset_handler :base do |path, prefix, request|
+        path.include?("://") ? path : File.join(app.http_prefix || "/", prefix, path)
+      end
+    end
+    alias :included :registered
+  end
+  
+  module ClassMethods    
+    def register_asset_handler(handler_name, &block)
+      @asset_handler_map   ||= []
+      @asset_handler_stack ||= []
+      
+      if block_given?
+        @asset_handler_stack << block
+        @asset_handler_map   << handler_name
+      end
+    end
+    
+    def asset_handler_get_url(path, prefix="", request=nil)
+      @asset_handler_map   ||= []
+      @asset_handler_stack ||= []
+      
+      @asset_handler_stack.last.call(path, prefix, request)
+    end
+    
+    def before_asset_handler(position, *args)
+      @asset_handler_map   ||= []
+      @asset_handler_stack ||= []
+      
+      current_index = @asset_handler_map.index(position)
+      return nil unless current_index
+
+      previous = current_index - 1
+      if (previous >= 0) && (previous < @asset_handler_map.length)
+        @asset_handler_stack[previous].call(*args)
+      else
+        nil
+      end
+    end
+  end
+  
+  module Helpers
+    def asset_url(path, prefix="")
+      self.class.asset_handler_get_url(path, prefix, request)
+    end
+  end
+end

lib/middleman/core_extensions/default_helpers.rb

@@ -56,10 +56,6 @@ module Middleman::CoreExtensions::DefaultHelpers
       classes.join(' ')
     end
     
-    def asset_url(path, prefix="")
-      Middleman::Assets.get_url(path, prefix, request)
-    end
-    
     # Padrino's asset handling needs to pass through ours
     def asset_path(kind, source)
        return source if source =~ /^http/