gistfile1.rb

def rounded_block(options={}, &block)
  raise ArgumentError, 'Missing block' unless block_given?
  options.symbolize_keys!
  
  concat(content_tag(:div, :id => options[:id], :class => ["rounded", options[:class]].compact.join(" ")) do
    content_tag(:div, :class => "rounded-top") do
      content_tag(:div, '', :class => "rounded-top-left") +
      content_tag(:div, '', :class => "rounded-top-right") +
      content_tag(:div, '', :class => "rounded-top-center")
    end +
    content_tag(:div, :class => 'rounded-content') do
      capture(&block)
    end +
    content_tag(:div, :class => "rounded-bottom") do
      content_tag(:div, '', :class => "rounded-bottom-left") +
      content_tag(:div, '', :class => "rounded-bottom-right") +
      content_tag(:div, '', :class => "rounded-bottom-center")
    end
  end, block.binding)
end