Extract out tree/blob/* partials

app/views/tree/blob/_text.html.haml

@@ -0,0 +1,15 @@
+- if gitlab_markdown?(blob.name)
+  .file_content.wiki
+    = preserve do
+      = markdown(blob.data)
+- elsif markup?(blob.name)
+  .file_content.wiki
+    = raw GitHub::Markup.render(blob.name, blob.data)
+- else
+  .file_content.code
+    - unless blob.empty?
+      %div{class: current_user.dark_scheme ? "black" : "white"}
+        = preserve do
+          = raw blob.colorize(options: { linenos: 'True'})
+    - else
+      %h4.nothing_here_message Empty file