## View

# From ThisController#this_action
<%= selected(:controller => 'this_controller', :classes => 'box') %>
=> class="selected box"

# From ThisController#this_action
<%= selected(:controller => 'this_controller', :action => 'this_action', :classes => 'section blue') %>
=> class="section red"

# From ThisController#this_action
<%= selected(:controller => 'this_controller', :action => 'different_action', :classes => 'section blue') %>
=> class="section blue"


## Helper

def current?(options = {})
  if !options[:action] and controller.controller_name == options[:controller]
    return true
  elsif !options[:controller] and controller.action_name == options[:action]
    return true
  elsif controller.controller_name == options[:controller] and controller.action_name == options[:action]
    return true
  else
    return false
  end
end

def selected(options = {})
  classes = options[:classes]
  status = current?(options) ? "selected" : nil
  classes = [status, classes].compact.join(" ")
  return " class=\"#{classes}\"" unless classes.empty?
end