module Haml::Helpers

def with_haml_buffer(buffer)
  @haml_buffer, old_buffer = buffer, @haml_buffer
  old_buffer.active, old_was_active = false, old_buffer.active? if old_buffer
  @haml_buffer.active, was_active = true, @haml_buffer.active?
  yield
ensure
  @haml_buffer.active = was_active
  old_buffer.active = old_was_active if old_buffer
  @haml_buffer = old_buffer
end