module Kernel

# File lib/core/kernel.rb, line 2
def u(css_rule)
  return UnderOs::App.history.current_page if css_rule == 'page'
  return UnderOs::App.history.navbar       if css_rule == 'navbar'

  elements = UnderOs::App.history.current_page.find(css_rule)

  if elements.size == 0
    nil
  elsif elements.size == 1
    elements[0]
  else
    elements
  end
end