Add render context to markdown renderer

app/helpers/application_helper.rb

@@ -43,7 +43,7 @@ module ApplicationHelper
   end
 
   def markdown(text)
-    @__renderer ||= Redcarpet::Markdown.new(Redcarpet::Render::GitlabHTML.new(filter_html: true), {
+    @__renderer ||= Redcarpet::Markdown.new(Redcarpet::Render::GitlabHTML.new(self, filter_html: true), {
       no_intra_emphasis: true,
       tables: true,
       fenced_code_blocks: true,

lib/redcarpet/render/gitlab_html.rb

 class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
+
+  attr_reader :template
+  alias_method :h, :template
+
+  def initialize(template, options = {})
+    @template = template
+    @project = @template.instance_variable_get("@project")
+    super options
+  end
+
   def block_code(code, language)
     if Pygments::Lexer.find(language)
       Pygments.highlight(code, :lexer => language, :options => {:encoding => 'utf-8'})