gistfile1.rb

def p_cool(text=nil, options={}, &proc)
  raise ArgumentError, "Missing block or text" unless block_given? or text
  if block_given?
    concat(p_cool(capture(&proc), options))
  else
    content_tag("p", text, options.merge(:class => "my_cool_class"))
  end
end

# In the view :
#
#
# != p_cool "lalala"
#
# - p_cool do
#   %strong lalala
#
#
# Outputs :
#
# <p class="my_cool_class">lalala</p> 
# <p class="my_cool_class"><strong>lalalala</strong></p>
#