Generate a set of URI Templates from the routes in an express app

uriTemplateMiddleware.coffee

makeTemplate = (path) ->
  i = 0
  path.replace(/\*(\w)?/g, "{+raw#{i++}}$1")
    .replace(/:(\w+)/g, '{$1}')
    .replace(/List}/g, 's*}')

uriTemplateMiddleware = (path='/') ->
  spec = null
  (req, res, next) ->
    if req.path == path
      spec ?= (makeTemplate(r.path) for r in req.app.routes.all())
      return res.send spec
    next()