Add render_tree helper; simplify (speed up) tree_icon

app/helpers/tree_helper.rb

@@ -1,31 +1,42 @@
 module TreeHelper
-  def tree_icon(content)
-    if content.is_a?(Grit::Blob)
-      if content.text?
-        image_tag "file_txt.png"
-      elsif content.image?
-        image_tag "file_img.png"
+  # Sorts a repository's tree so that folders are before files and renders
+  # their corresponding partials
+  #
+  # contents - A Grit::Tree object for the current tree
+  def render_tree(contents)
+    # Render Folders before Files/Submodules
+    folders, files = contents.partition { |v| v.kind_of?(Grit::Tree) }
+
+    tree = ""
+
+    # Render folders if we have any
+    tree += render partial: 'tree/tree_item', collection: folders, locals: {type: 'folder'} if folders.present?
+
+    files.each do |f|
+      if f.respond_to?(:url)
+        # Object is a Submodule
+        tree += render partial: 'tree/submodule_item', object: f
       else
-        image_tag "file_bin.png"
+        # Object is a Blob
+        tree += render partial: 'tree/tree_item', object: f, locals: {type: 'file'}
       end
-    else
-      image_tag "file_dir.png"
     end
+
+    tree.html_safe
+  end
+
+  # Return an image icon depending on the file type
+  #
+  # type - String type of the tree item; either 'folder' or 'file'
+  def tree_icon(type)
+    image = type == 'folder' ? 'file_dir.png' : 'file_txt.png'
+    image_tag(image, size: '16x16')
   end
 
   def tree_hex_class(content)
     "file_#{hexdigest(content.name)}"
   end
 
-  def tree_full_path(content)
-    content.name.force_encoding('utf-8')
-    if params[:path]
-      File.join(params[:path], content.name)
-    else
-      content.name
-    end
-  end
-
   # Public: Determines if a given filename is compatible with GitHub::Markup.
   #
   # filename - Filename string to check