Pass CoffeeCup params down to embedded CoffeeScript

wes.coffee

require('zappajs') ->
  @use 'zappa'
  @enable 'default layout'

  @get '/': ->
    foo = 'bar'
    @render 'index', foo: foo, hardcode: { coffee: export_params }

  @view index: ->
    @scripts = ['/zappa/jquery']
    coffee ->
      $(document).ready ->
        alert params.foo

# Embed the @render params into window.params (aka `params` since
# window is the client-side Javascript context).

export_params = (coffee) ->
  text "<script> window.params = {};"
  for name, value of @
    try text """
      window.params[#{JSON.stringify name}] = #{JSON.stringify value};
    """
  text "</script>"
  coffeescript coffee