Enable markdown pipeline filters from inside gitlab.

lib/gitlab/markdown.rb

@@ -70,14 +70,17 @@ module Gitlab
         insert_piece($1)
       end
 
-      # Context passed to the markdoqwn pipeline
-      markdown_context = {
-        asset_root: File.join(root_url,
-                              Gitlab::Application.config.assets.prefix)
-      }
-
-      result = HTML::Pipeline::Gitlab::MarkdownPipeline.call(text,
-                                                             markdown_context)
+      # Used markdown pipelines in GitLab:
+      # GitlabEmojiFilter - performs emoji replacement.
+      #
+      # see https://gitlab.com/gitlab-org/html-pipeline-gitlab for more filters
+      filters = [
+        HTML::Pipeline::Gitlab::GitlabEmojiFilter
+      ]
+
+      markdown_pipeline = HTML::Pipeline::Gitlab.new(filters).pipeline
+
+      result = markdown_pipeline.call(text)
       text = result[:output].to_html(save_with: 0)
 
       allowed_attributes = ActionView::Base.sanitized_allowed_attributes