WIP attempt to build an org previewer

app/controllers/concerns/preview_orgmode.rb

+# frozen_string_literal: true
+
+module PreviewOrgmode
+  extend ActiveSupport::Concern
+
+  def preview_orgmode
+    context = {
+      current_user: (current_user if defined?(current_user)),
+
+      # RelativeLinkFilter
+      project:        project,
+      commit:         @commit,
+      project_wiki:   @project_wiki,
+      ref:            @ref,
+      requested_path: @path
+    }
+
+    html = Gitlab::OtherMarkup.render('preview.org', params[:text], context)
+    html = Banzai.post_process(html, context)
+    html = Hamlit::RailsHelpers.preserve(html)
+
+    render json: {
+      body: html
+    }
+  end
+end

app/controllers/projects/wikis_controller.rb

@@ -2,6 +2,7 @@
 class Projects::WikisController < Projects::ApplicationController
   include PreviewMarkdown
+  include PreviewOrgmode
   include Gitlab::Utils::StrongMemoize
   before_action :authorize_read_wiki!