show rendered file if it is .markdown file

app/views/refs/_tree_file.html.haml

@@ -9,6 +9,12 @@
         = link_to "raw", blob_project_ref_path(@project, @ref, :path => params[:path]), :class => "right", :target => "_blank"
         = link_to "history", project_commits_path(@project, :path => params[:path], :ref => @ref), :class => "right", :style => "margin-right:10px;"
   - if file.text?
+    - if name =~ /\.(md|markdown)$/i
+      #tree-readme-holder
+        .readme
+          = preserve do
+            = markdown(file.data)
+    - else
       .view_file_content
         - unless file.empty?
           %div{:class => current_user.dark_scheme ? "black" : "white"}