config.ru

#\ -p 4000

require 'rubygems'
require 'bundler'
require 'json'
begin
  Bundler.setup(:default, :development)
rescue Bundler::BundlerError => e
  $stderr.puts e.message
  $stderr.puts "Run `bundle install` to install missing gems"
  exit e.status_code
end

require 'serve'
require 'serve/rack'

# The project root directory
root = ::File.dirname(__FILE__)

# Compile Sass on the fly with the Sass plugin. Some production environments
# don't allow you to write to the file system on the fly (like Heroku).
# Remove this conditional if you want to compile Sass in production.
if ENV['RACK_ENV'] != 'production'
  require 'sass'
  require 'sass/plugin/rack'
  require 'compass'
  
  Compass.add_project_configuration(root + '/compass.config')
  Compass.configure_sass_plugin!
  
  use Sass::Plugin::Rack  # Sass Middleware
end

# Other Rack Middleware
use Rack::ShowStatus      # Nice looking 404s and other messages
use Rack::ShowExceptions  # Nice looking errors

# Rack Application
if ENV['SERVER_SOFTWARE'] =~ /passenger/i
  # Passendger only needs the adapter
  run Serve::RackAdapter.new(root + '/views')
else
  # Use Rack::Cascade and Rack::Directory on other platforms for static assets
  run Rack::Cascade.new([
    Serve::RackAdapter.new(root + '/views'),
    Rack::Directory.new(root + '/public')
  ])
end

foo.html.erb

<%
	has_waypoints = true

	lat = 34
	lon = 118
	min = 0.01
	max = 0.09

	lat_min = lat + min
	lat_max = lat + max
	lon_min = lon + min
	lon_max = lon + max

	num = 8

	data = {
		:start => [ rand * (lat_max - lat_min) + lat_min, rand * (lon_max - lon_min) + lon_min ],
		:end => [ rand * (lat_max - lat_min) + lat_min, rand * (lon_max - lon_min) + lon_min ]
	}

	if has_waypoints
		waypoints = []
		(0..num).each do |foo|
			waypoints << [ rand * (lat_max - lat_min) + lat_min, rand * (lon_max - lon_min) + lon_min ]
		end	
		data[:waypoints] = waypoints
	end

	# puts data.to_json # production
%>
<pre>
	<%= JSON.pretty_generate(data) %>
</pre>

Gemfile

source :rubygems

gem 'serve', '1.5.1'

# Use edge instead:
# gem 'serve', :git => 'git://github.com/jlong/serve.git'

# Use Compass and Sass
gem 'compass'

# Markdown and Textile
# gem 'rdiscount' # Markdown
# gem 'RedCloth'  # Textile

# Other templating languages
# gem 'erubis'
# gem 'haml'
# gem 'slim'
# gem 'radius'
# gem 'less'

# Coffee Script
# gem 'coffee-script'

# Use mongrel for the Web server
# gem 'mongrel'

gem 'json'

index.redirect

Serve has a special file type for mapping HTTP redirects. Redirects make nice
end points for form posts or short URLs.

Redirect URLs can be fully formed, like this:

http://wiseheartdesign.com/

Or, relative to the site root, like this:

/action

Extra lines at the beginning of a redirect file are ignored. By convention,
the last line of a redirect file is the URL to redirect to:

/welcome

/foo