1 files changed, 85 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/helpers/sprockets_helper.rb b/actionpack/lib/action_view/helpers/sprockets_helper.rb
new file mode 100644
index 0000000000..408a2030ab
--- /dev/null
+++ b/actionpack/lib/action_view/helpers/sprockets_helper.rb
@@ -0,0 +1,85 @@
+require 'uri'
+
+module ActionView
+  module Helpers
+    module SprocketsHelper
+      def sprockets_javascript_path(source)
+        compute_sprockets_path source, 'assets', 'js'
+      end
+
+      def sprockets_javascript_include_tag(source, options = {})
+        options = {
+          'type' => "text/javascript",
+          'src'  => sprockets_javascript_path(source)
+        }.merge(options.stringify_keys)
+
+        content_tag 'script', "", options
+      end
+
+      def sprockets_stylesheet_path(source)
+        compute_sprockets_path source, 'assets', 'css'
+      end
+
+      def sprockets_stylesheet_link_tag(source, options = {})
+        options = {
+          'rel'   => "stylesheet",
+          'type'  => "text/css",
+          'media' => "screen",
+          'href'  => sprockets_stylesheet_path(source)
+        }.merge(options.stringify_keys)
+
+        tag 'link', options
+      end
+
+      private
+        def compute_sprockets_path(source, dir, default_ext)
+          source = source.to_s
+
+          return source if URI.parse(source).host
+
+          # Add /javscripts to relative paths
+          if source[0] != ?/
+            source = "/#{dir}/#{source}"
+          end
+
+          # Add default extension if there isn't one
+          if default_ext && File.extname(source).empty?
+            source = "#{source}.#{default_ext}"
+          end
+
+          # Fingerprint url
+          if source =~ /^\/#{dir}\/(.+)/
+            source = assets.path($1, config.perform_caching, dir)
+          end
+
+          host = compute_asset_host(source)
+
+          if controller.respond_to?(:request) && host && URI.parse(host).host
+            source = "#{controller.request.protocol}#{host}#{source}"
+          end
+
+          source
+        end
+
+        def compute_asset_host(source)
+          if host = config.asset_host
+            if host.is_a?(Proc) || host.respond_to?(:call)
+              case host.is_a?(Proc) ? host.arity : host.method(:call).arity
+              when 2
+                request = controller.respond_to?(:request) && controller.request
+                host.call(source, request)
+              else
+                host.call(source)
+              end
+            else
+              (host =~ /%d/) ? host % (source.hash % 4) : host
+            end
+          end
+        end
+
+        def assets
+          Rails.application.assets
+        end
+    end
+  end
+end