text: from django.http import HttpResponse
  from django.template.loader import select_template
  
  from regulations.generator import api_reader
  from regulations.generator.versions import fetch_grouped_history
  from regulations.views import utils
  
  
  def regulation_exists(label_id):
      client = api_reader.ApiReader()
      vr = client.regversions(label_id)
      return (vr and len(vr) > 0)
  
  
  def get_versions(label_id):
      """ Get the current and next version of the regulation. """
      history = fetch_grouped_history(label_id)
      if history:
          future = [h for h in history if h['timeline'].is_future()]
          if len(future) > 0:
              next_version = future[-1]
          else:
              next_version = None
  
          current = [h for h in history if h['timeline'].is_present()]
          current_version = current[0]
          return (current_version, next_version)
  
  
  def regulation(request, label_id):
  
      context = {}
      current_version, new_version = get_versions(label_id)
      if new_version:
          context['new_version'] = new_version
      context['current_version'] = current_version
  
      context['label_id'] = label_id
      context['reg_first_section'] = utils.first_section(
          label_id, current_version['version'])
      context['reg_part'] = label_id.split('-')[0]
  
      context['meta'] = utils.regulation_meta(label_id,
                                              current_version['version'])
  
      t = select_template([
          'regulations/landing_%s.html' % label_id,
          'regulations/landing_base.html',
          'regulations/generic_landing.html'])
      return HttpResponse(t.render(context, request))
  