Sinatra app example

app.rb

require 'sinatra'
require 'haml'

# run this app calling "ruby app.rb"

get '/' do
  haml :index
end

get '/:name' do |n|
  @name = n
  haml :index
end

Gemfile

source :rubygems

gem 'sinatra'
gem 'haml'

index.haml

# put this in /views

%h1= "Hello World #{@name}!"

layout.haml

# put this in /views

%html
  %head
    %title Hello World
  %body
    =yield