Use the WikiPipeline when rendering the wiki markdown content

app/helpers/gitlab_markdown_helper.rb

@@ -91,7 +91,7 @@ module GitlabMarkdownHelper
   def render_wiki_content(wiki_page)
     case wiki_page.format
     when :markdown
-      markdown(wiki_page.content)
+      markdown(wiki_page.content, pipeline: :wiki, project_wiki: @project_wiki)
     when :asciidoc
       asciidoc(wiki_page.content)
     else

lib/banzai/pipeline/gollum_tags_pipeline.rb

+require 'banzai'
+
+module Banzai
+  module Pipeline
+    class GollumTagsPipeline < BasePipeline
+      def self.filters
+        [
+          Filter::GollumTagsFilter
+        ]
+      end
+    end
+  end
+end

lib/banzai/pipeline/wiki_pipeline.rb

+require 'banzai'
+
+module Banzai
+  module Pipeline
+    class WikiPipeline < CombinedPipeline.new(PlainMarkdownPipeline, GollumTagsPipeline, GfmPipeline)
+
+    end
+  end
+end

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -121,12 +121,13 @@ describe GitlabMarkdownHelper do
     before do
       @wiki = double('WikiPage')
       allow(@wiki).to receive(:content).and_return('wiki content')
+      helper.instance_variable_set(:@project_wiki, @wiki)
     end
 
-    it "should use GitLab Flavored Markdown for markdown files" do
+    it "should use Wiki pipeline for markdown files" do
       allow(@wiki).to receive(:format).and_return(:markdown)
 
-      expect(helper).to receive(:markdown).with('wiki content')
+      expect(helper).to receive(:markdown).with('wiki content', pipeline: :wiki, project_wiki: @wiki)
 
       helper.render_wiki_content(@wiki)
     end