config.rb

###
# Compass
###

# Susy grids in Compass
# First: gem install susy
# require 'susy'

# Change Compass configuration
# compass_config do |config|
#   config.output_style = :compact
# end

###
# Page options, layouts, aliases and proxies
###

# Per-page layout changes:
#
# With no layout
# page "/path/to/file.html", :layout => false
#
# With alternative layout
# page "/path/to/file.html", :layout => :otherlayout
#
# A path which all have the same layout
# with_layout :admin do
#   page "/admin/*"
# end

# Proxy (fake) files
# page "/this-page-has-no-template.html", :proxy => "/template-file.html" do
#   @which_fake_page = "Rendering a fake page with a variable"
# end

###
# Helpers
###

# Automatic image dimensions on image_tag helper
# activate :automatic_image_sizes

# Methods defined in the helpers block are available in templates
# helpers do
#   def some_helper
#     "Helping"
#   end
# end

set :css_dir, 'stylesheets'

set :js_dir, 'javascripts'

set :images_dir, 'images'

# Build-specific configuration
configure :build do
  # For example, change the Compass output style for deployment
  # activate :minify_css

  # Minify Javascript on build
  # activate :minify_javascript

  # Enable cache buster
  # activate :cache_buster

  # Use relative URLs
  # activate :relative_assets

  # Compress PNGs after build
  # First: gem install middleman-smusher
  # require "middleman-smusher"
  # activate :smusher

  # Or use a different image path
  # set :http_path, "/Content/images/"
end

config.ru

require 'rack'
require 'rack/contrib/try_static'
require './hullapp'

# First, `use` our hullapp middleware
use HullApp

# Then `use` the trystatic middleware
use Rack::TryStatic, :root => "build", :urls => %w[/], :try => ['.html', 'index.html', '/index.html']

# Lastly, fallback to a 404 - since it's the Last one, we `run` it.
run lambda{ |env|
  not_found_page = File.expand_path("./build/404/index.html", __FILE__)
  if File.exist?(not_found_page)
    [ 404, { 'Content-Type'  => 'text/html'}, [File.read(not_found_page)] ]
  else
    [ 404, { 'Content-Type'  => 'text/html' }, ['404 - page not found'] ]
  end
}

hullapp.rb

require 'sinatra'
require 'sinatra/base'
require 'json' # Always handy

class HullApp < Sinatra::Base

  # Fall back to this when needed
  set :static, true 
  set :public_folder, File.dirname(__FILE__) + '/build'

  # Define a form submit route, in POST
  get '/subscribe' do

    # Last arg is sent to the browser
    params.to_json
  end
end