Prepare code for asset pipeline. refs lucasefe#54

* check for asset digest and store in TFR config

* If asset pipeline, use theme_assets_dir config and PREPEND to
config.asset.paths. This requires theme assets to be in a folder under
the theme_name so as not to clobber other themes.

* When gathering digested assets, fallback to the original asset if no
digested one is available

lib/themes_for_rails.rb

@@ -35,7 +35,22 @@ def add_themes_path_to_sass
         raise "Sass is not available. What are you trying to do?"
       end
     end
-
+
+    def check_asset_pipeline
+      config.asset_digests_enabled ||= Rails.application.config.respond_to?(:assets) && Rails.application.config.assets.digest == true
+    end
+
+    def add_themes_assets_to_asset_pipeline
+      Rails.logger.info "Start adding themes to assets [#{ThemesForRails.config.asset_digests_enabled?}]"
+      if ThemesForRails.config.asset_digests_enabled?
+        available_theme_names.each do |theme_name|
+          theme_asset_path = ThemesForRails.config.assets_dir.gsub(":root", ThemesForRails.config.base_dir).gsub(":name", theme_name.to_s)
+          Rails.logger.info "== Adding theme [#{theme_name}] asset dir [#{theme_asset_path}] to asset pipeline"
+          Rails.application.config.assets.paths.prepend(theme_asset_path)
+        end
+      end
+    end
+
     def already_configured_in_sass?(sass_dir)
       Sass::Plugin.template_location_array.map(&:first).include?(sass_dir)
     end

lib/themes_for_rails/common_methods.rb

@@ -44,24 +44,24 @@ def add_theme_view_path_for(name)
     end
 
     def digest_for_image(asset, theme_context)
-      if Rails.application.config.respond_to?('assets') && Rails.application.config.assets.digests
-        File.basename(Rails.application.config.assets.digests["#{theme_context}/images/#{asset}"])
+      if ThemesForRails.config.asset_digests_enabled?
+        Rails.application.config.assets.digests["#{theme_context}/images/#{asset}"] || asset
       else
         asset
       end
     end
 
     def digest_for_javascript(asset, theme_context)
-      if Rails.application.config.respond_to?('assets') && Rails.application.config.assets.digests
-        File.basename(Rails.application.config.assets.digests["#{theme_context}/javascripts/#{asset}"])
+      if ThemesForRails.config.asset_digests_enabled?
+        Rails.application.config.assets.digests["#{theme_context}/javascripts/#{asset}"] || asset
       else
         asset
       end
     end
 
     def digest_for_stylesheet(asset, theme_context)
-      if Rails.application.config.respond_to?('assets') && Rails.application.config.assets.digests
-        File.basename(Rails.application.config.assets.digests["#{theme_context}/stylesheets/#{asset}"])
+      if ThemesForRails.config.asset_digests_enabled?
+        Rails.application.config.assets.digests["#{theme_context}/stylesheets/#{asset}"] || asset
       else
         asset
       end

lib/themes_for_rails/config.rb

@@ -3,13 +3,14 @@ module ThemesForRails
   class Config
 
     attr_writer :base_dir, :themes_dir, :assets_dir, :views_dir, :themes_routes_dir
-    attr_accessor :use_sass, :default_theme
+    attr_accessor :use_sass, :default_theme, :asset_digests_enabled
 
     include Interpolation
 
     def initialize(&block)
       @use_sass = true
       @default_theme = 'default'
+      @asset_digests_enabled = nil
       yield if block_given?
     end
 
@@ -70,5 +71,9 @@ def use_sass?
     def sass_is_available?
       !!defined?Sass::Plugin
     end
+
+    def asset_digests_enabled?
+      @asset_digests_enabled
+    end
   end  
-end
+end

lib/themes_for_rails/railtie.rb

@@ -9,9 +9,15 @@ class Railtie < ::Rails::Railtie
         ThemesForRails.config.send "#{key}=".to_sym, value
       end
 
-      # Adding theme stylesheets path to sass, automatically. 
+      # Adding theme stylesheets path to sass, automatically.
       ThemesForRails.add_themes_path_to_sass if ThemesForRails.config.use_sass?
-
+
+      # Check if asset pipeline enabled
+      ThemesForRails.check_asset_pipeline
+
+      # Adding theme assets to the asset pipeline, automatically.
+      ThemesForRails.add_themes_assets_to_asset_pipeline if ThemesForRails.config.asset_digests_enabled?
+
       ActiveSupport.on_load(:action_view) do
         include ThemesForRails::ActionView
       end