Using github's linguist to better detect filetypes and to do syntax highlighting.

app/views/refs/_tree_file.html.haml

@@ -11,10 +11,10 @@
   - if file.text?
     .view_file_content
       - unless file.empty?
-        %div{:class => current_user.dark_scheme ? "black" : "white"} 
-          = preserve do 
-            = raw file.colorize
-      - else 
+        %div{:class => current_user.dark_scheme ? "black" : "white"}
+          = preserve do
+            = raw file.colorize(options: { linenos: 'True'})
+      - else
         %h3
           %center Empty file
   - elsif file.image?

app/views/snippets/show.html.haml

@@ -13,8 +13,7 @@
       .view_file_header
         %strong= @snippet.file_name
       .view_file_content
-        %div{:class => current_user.dark_scheme ? "black" : ""} 
-          :erb
-            <%= raw @snippet.colorize %>
+        %div{:class => current_user.dark_scheme ? "black" : ""}
+          = raw @snippet.colorize(options: { linenos: 'True'})
 
 = render "notes/notes", :tid => @snippet.id, :tt => "snippet"