convo.rb

require 'sinatra'
require 'sinatra/strands'
require 'haml'

helpers do
  def message locals={}
    haml :message,
         :locals => {:uri => strand_uri }.merge(locals)
  end
end

strand_get '/' do
  show message :text => "Step 1: click this button",  :button => "ok"
  show message :text => "Step 2: click it again",     :button => "yup"
  show message :text => "Step 3: one more time baby", :button => "oh yeah"
  message      :text => "Ok, you're done",            :button => "again", :uri => '/'
end

__END__

@@ message
%html
  %head
    %title A Poignant Message From The Internet
  %body
    %h1= text
    %a{:href => uri, :style => "border: 1px solid black; padding: 10px" }= button