Support webpacker assets

.rubocop.yml

@@ -10,6 +10,11 @@ Metrics/BlockLength:
   Exclude:
     - 'wicked_pdf.gemspec'
 
+Metrics/ModuleLength:
+  Exclude:
+    # Excluding to keep the logic in one module for the time being.
+    - 'lib/wicked_pdf/wicked_pdf_helper/assets.rb'
+
 # I'd like wicked_pdf to keep Ruby 1.8 compatibility for now
 Style/HashSyntax:
   EnforcedStyle: hash_rockets

README.md

@@ -109,11 +109,13 @@ Using wicked_pdf_helpers with asset pipeline raises `Asset names passed to helpe
 
 #### Webpacker usage
 
-wicked_pdf supports webpack stylesheets and javascript assets.
+wicked_pdf supports webpack assets.
 
 Use `wicked_pdf_stylesheet_pack_tag` for stylesheets
 Use `wicked_pdf_javascript_pack_tag` for javascripts
 
+Use `wicked_pdf_asset_pack_path` to access an asset directly, for example: `image_tag wicked_pdf_asset_pack_path("media/images/foobar.png")`
+
 #### Asset pipeline usage
 
 It is best to precompile assets used in PDF views. This will help avoid issues when it comes to deploying, as Rails serves asset files differently between development and production (`config.assets.compile = false`), which can make it look like your PDFs work in development, but fail to load assets in production.

lib/wicked_pdf/wicked_pdf_helper/assets.rb

@@ -79,6 +79,16 @@ def wicked_pdf_asset_path(asset)
         end
       end
 
+      def wicked_pdf_asset_pack_path(asset)
+        return unless defined?(Webpacker)
+
+        if running_in_development?
+          asset_pack_path(asset)
+        else
+          wicked_pdf_asset_path webpacker_source_url(asset)
+        end
+      end
+
       private
 
       # borrowed from actionpack/lib/action_view/helpers/asset_url_helper.rb