Render blob using blob viewers

app/views/projects/blob/_blob.html.haml

@@ -26,9 +26,4 @@
   %article.file-holder
     = render "projects/blob/header", blob: blob
 
-    - if blob.empty?
-      .file-content.code
-        .nothing-here-block
-          Empty file
-    - else
-      = render blob.to_partial_path(@project), blob: blob
+    = render 'projects/blob/content', blob: blob

app/views/projects/blob/_content.html.haml

+- simple_viewer = blob.simple_viewer
+- rich_viewer = blob.rich_viewer
+- active_viewer = rich_viewer && params[:viewer] != 'simple' ? :rich : :simple
+
+= render 'projects/blob/viewer_wrapper', viewer: simple_viewer, hidden: (active_viewer != :simple)
+
+- if rich_viewer
+  = render 'projects/blob/viewer_wrapper', viewer: rich_viewer, hidden: (active_viewer != :rich)

app/views/projects/blob/_viewer.html.haml

+- if error = viewer.render_error(override_max_size: params[:override_max_size])
+  = render 'projects/blob/render_error', viewer: viewer, error: error
+- else
+  - viewer.prepare!
+  = render viewer.partial_path, viewer: viewer

app/views/projects/blob/_viewer_wrapper.html.haml

+- hidden = local_assigns.fetch(:hidden, false)
+- url = url_for(params.merge(format: :json, viewer: viewer.type)) if viewer.server_side?
+.blob-viewer{ data: { type: viewer.type, url: url }, class: ('hidden' if hidden) }
+  - if viewer.server_side?
+    .text-center.prepend-top-default.append-bottom-default
+      = icon('spinner spin 2x', 'aria-hidden' => 'true', 'aria-label' => 'Loading content')
+  - else
+    = render 'projects/blob/viewer', viewer: viewer