javacscript_hosts.rb

# Rack middleware for serving individual javascript files
# from non-public directories to the Jammit asset packager
# when in test or development modes
#
# To use, add this line to the relevant (development)
# environment file:
#
#     config.middleware.use 'JavascriptsHost'  
#

class JavascriptsHost

  def initialize(app, opts={})
    @app = app
    @location = opts[:location] || '/app/javascripts'
    root = opts[:root] || Dir.pwd
    @file_server = Rack::File.new(root)
  end

  def call(env)
    path = env["PATH_INFO"]
    if path.index(@location) == 0
      resp = @file_server.call(env)
      return resp unless resp[0] == 404
    end
    @app.call(env)
  end
end