Mustache Existential Operator

mm.rb

require 'mustache'

module ExistentialMethodMissing
  def method_missing(method, *args)
    return super unless method.to_s =~ /\?$/
    val = send(method.to_s.chomp('?'))
    val.respond_to?(:empty?) ? !val.empty? : !!val
  end

  def respond_to?(method)
    super method.to_s.chomp('?')
  end
end

class MyView < Mustache
  include ExistentialMethodMissing
  self.template = <<template
{{# people?}}
  <ul>
    {{# people}}
      <li>{{ name }}</li>
    {{/ people}}
  </ul>
{{/ people?}}
template

  def people
    return [
      { :name => "Chris" },
      { :name => "Bob" },
      { :name => "Mislav" }
    ]
  end
end

puts MyView.render