class Tilt::MustacheTemplate

def compile!
  Mustache.view_namespace = options[:namespace]
  Mustache.view_path = options[:view_path] || options[:mustaches]
  @engine = options[:view] || Mustache.view_class(name)
  options.each do |key, value|
    next if %w[view view_path namespace mustaches].include?(key.to_s)
    @engine.send("#{key}=", value) if @engine.respond_to? "#{key}="
  end
end

def evaluate(scope=nil, locals={}, &block)
  instance = @engine.new
  # copy instance variables from scope to the view
  scope.instance_variables.each do |name|
    instance.instance_variable_set(name, scope.instance_variable_get(name))
  end
  # locals get added to the view's context
  locals.each do |local, value|
    instance[local] = value
  end
  # if we're passed a block it's a subview. Sticking it in yield
  # lets us use {{yield}} in layout.html to render the actual page.
  instance[:yield] = block.call if block
  instance.template = data unless instance.compiled?
  instance.to_html
end

def initialize_engine
  require_template_library 'mustache' unless defined? ::Mustache
end