Lets you use haml, sass and coffee script from Sinatra by compiling on demand

sinatra_awesome_css_js_html.rb

# sass handler
get /\/(.*)\.css/ do |stylesheet|
  headers 'Content-Type' => 'text/css; charset=utf-8'
  sass stylesheet.to_sym
end

# coffee script handler
get %r{/(.*)\.js} do |js|
  # compile coffee script and place in respective JS folder
  coffee = "#{ROOT_DIR}/js/#{js}.coffee"
  target = "#{ROOT_DIR}/js/compiled/#{js}.js"
  raise "Couldn't find #{coffee}" unless File.exists? coffee
  if system <<-CMD
    mkdir -p #{target.gsub(%r{[^/]*\w*$},'')} &&
    /usr/local/bin/coffee --print #{coffee} > #{target}
  CMD
    File.read target
  else
    $?
  end
end

# haml handler for templates
get %r{/(.*)\.html} do |template|
  haml_target = "#{ROOT_DIR}/js/#{template}.haml"
  haml_engine = Haml::Engine.new(File.read(haml_target))
  haml_engine.render
end