nav_helper.rb

module NavHelper
  def nav_menu_collapsed?
    cookies[:collapsed_nav] == 'true'
  end

  def nav_sidebar_class
    if nav_menu_collapsed?
      "sidebar-collapsed"
    else
      "sidebar-expanded"
    end
  end

  def page_sidebar_class
    if nav_menu_collapsed?
      "page-sidebar-collapsed"
    else
      "page-sidebar-expanded"
    end
  end

  def page_gutter_class
    if current_path?('merge_requests#show') ||
      current_path?('merge_requests#diffs') ||
      current_path?('merge_requests#commits') ||
      current_path?('merge_requests#builds') ||
      current_path?('issues#show')
      if cookies[:collapsed_gutter] == 'true'
        "page-gutter right-sidebar-collapsed"
      else
        "page-gutter right-sidebar-expanded"
      end
    end
  end

  def nav_header_class
    class_name =
      if nav_menu_collapsed?
        "header-collapsed"
      else
        "header-expanded"
      end
    class_name += " with-horizontal-nav" if defined?(nav) && nav
    class_name
  end

  def layout_nav_class
    "page-with-layout-nav" if defined?(nav) && nav
  end

  def layout_dropdown_class
    "controls-dropdown-visible" if current_user
  end
end