Move attachment rendering to a helper

Fixes #5

app/helpers/action_text/content_helper.rb

@@ -0,0 +1,24 @@
+module ActionText
+  module ContentHelper
+    def render_action_text_content(content)
+      content = content.render_attachments do |attachment|
+        unless attachment.in?(content.gallery_attachments)
+          attachment.node.tap do |node|
+            node.inner_html = render(attachment, in_gallery: false).chomp
+          end
+        end
+      end
+
+      content = content.render_attachment_galleries do |attachment_gallery|
+        render(layout: attachment_gallery, object: attachment_gallery) do
+          attachment_gallery.attachments.map do |attachment|
+            attachment.node.inner_html = render(attachment, in_gallery: true).chomp
+            attachment.to_html
+          end.join("").html_safe
+        end.chomp
+      end
+
+      content.to_html
+    end
+  end
+end

app/views/action_text/content/_layout.html.erb

@@ -1,3 +1,3 @@
 <div class="trix-content">
-  <%= sanitize document %>
+  <%= sanitize render_action_text_content(content) %>
 </div>

app/views/active_storage/blobs/_blob.html.erb

@@ -1,8 +1,9 @@
+<% transformations = { resize: local_assigns[:in_gallery] ? "800x600>" : "1024x768>" } %>
 <figure class="attachment attachment--<%= blob.representable? ? "preview" : "file" %> attachment--<%= blob.filename.extension %>">
   <% if blob.variable? %>
-    <%= image_tag blob.variant(resize: "1024x768>") %>
+    <%= image_tag blob.variant(transformations) %>
   <% elsif blob.previewable? %>
-    <%= image_tag blob.preview(resize: "1024x768>") %>
+    <%= image_tag blob.preview(transformations) %>
   <% end %>
 
   <figcaption class="attachment__caption">

lib/action_text/content.rb

@@ -81,23 +81,8 @@ module ActionText
       fragment.to_html
     end
 
-    def to_rendered_html
-      render_attachments do |attachment|
-        attachment.node.tap do |node|
-          node.inner_html = ActionText.renderer.render(attachment)
-        end
-      end.render_attachment_galleries do |attachment_gallery|
-        ActionText.renderer.render(layout: attachment_gallery, object: attachment_gallery, formats: "html") do
-          attachment_gallery.attachments.map do |attachment|
-            attachment.node.inner_html = ActionText.renderer.render(attachment)
-            attachment.to_html
-          end.join("").html_safe
-        end
-      end.to_html
-    end
-
     def to_rendered_html_with_layout
-      ActionText.renderer.render(partial: "action_text/content/layout", locals: { document: to_rendered_html })
+      ActionText.renderer.render(partial: "action_text/content/layout", locals: { content: self })
     end
 
     def to_s

lib/action_text/engine.rb

@@ -25,7 +25,7 @@ module ActionText
 
     initializer "action_text.helper" do
       ActiveSupport.on_load(:action_controller_base) do
-        helper ActionText::TagHelper
+        helper ActionText::Engine.helpers
       end
     end
 
@@ -33,7 +33,7 @@ module ActionText
       config.after_initialize do |app|
         ActionText.renderer ||= ApplicationController.renderer
 
-        # FIXME: ApplicationController should have a per-request specific renderer 
+        # FIXME: ApplicationController should have a per-request specific renderer
         # that's been set with the request.env env, and ActionText should just piggyback off
         # that by default rather than doing this work directly.
         ApplicationController.before_action do