old_contents: """Modoboa stats forms."""
  
  import rrdtool
  
  from django.conf import settings
  from django.utils.translation import ugettext_lazy
  from django import forms
  
  from versionfield.constants import DEFAULT_NUMBER_BITS
  from versionfield.version import Version
  
  from modoboa.lib import form_utils
  from modoboa.parameters import forms as param_forms
  
  
  class ParametersForm(param_forms.AdminParametersForm):
      """Stats global parameters."""
  
      app = "modoboa_stats"
  
      general_sep = form_utils.SeparatorField(label=ugettext_lazy("General"))
  
      logfile = forms.CharField(
          label=ugettext_lazy("Path to the log file"),
          initial="/var/log/mail.log",
          help_text=ugettext_lazy("Path to log file used to collect statistics"),
          widget=forms.TextInput(attrs={"class": "form-control"})
      )
  
      rrd_rootdir = forms.CharField(
          label=ugettext_lazy("Directory to store RRD files"),
          initial="/tmp/modoboa",
          help_text=ugettext_lazy(
              "Path to directory where RRD files are stored"),
          widget=forms.TextInput(attrs={"class": "form-control"})
      )
  
      greylist = form_utils.YesNoField(
          label=ugettext_lazy("Show greylisted messages"),
          initial=False,
          help_text=ugettext_lazy(
              "Differentiate between hard and soft rejects (greylisting)")
      )
  
      def __init__(self, *args, **kwargs):
          """Check RRDtool version."""
          super(ParametersForm, self).__init__(*args, **kwargs)
          rrd_version = Version(rrdtool.lib_version(), DEFAULT_NUMBER_BITS)
          required_version = Version("1.6.0", DEFAULT_NUMBER_BITS)
          test_mode = getattr(settings, "RRDTOOL_TEST_MODE", False)
          if rrd_version < required_version and not test_mode:
              del self.fields["greylist"]
  
new_contents: """Modoboa stats forms."""
  
  import rrdtool
  
  from pkg_resources import parse_version
  
  from django.conf import settings
  from django.utils.translation import ugettext_lazy
  from django import forms
  
  from modoboa.lib import form_utils
  from modoboa.parameters import forms as param_forms
  
  
  class ParametersForm(param_forms.AdminParametersForm):
      """Stats global parameters."""
  
      app = "modoboa_stats"
  
      general_sep = form_utils.SeparatorField(label=ugettext_lazy("General"))
  
      logfile = forms.CharField(
          label=ugettext_lazy("Path to the log file"),
          initial="/var/log/mail.log",
          help_text=ugettext_lazy("Path to log file used to collect statistics"),
          widget=forms.TextInput(attrs={"class": "form-control"})
      )
  
      rrd_rootdir = forms.CharField(
          label=ugettext_lazy("Directory to store RRD files"),
          initial="/tmp/modoboa",
          help_text=ugettext_lazy(
              "Path to directory where RRD files are stored"),
          widget=forms.TextInput(attrs={"class": "form-control"})
      )
  
      greylist = form_utils.YesNoField(
          label=ugettext_lazy("Show greylisted messages"),
          initial=False,
          help_text=ugettext_lazy(
              "Differentiate between hard and soft rejects (greylisting)")
      )
  
      def __init__(self, *args, **kwargs):
          """Check RRDtool version."""
          super(ParametersForm, self).__init__(*args, **kwargs)
          rrd_version = parse_version(rrdtool.lib_version())
          required_version = parse_version("1.6.0")
          test_mode = getattr(settings, "RRDTOOL_TEST_MODE", False)
          if rrd_version < required_version and not test_mode:
              del self.fields["greylist"]
  
subject: use setuptools.parse_version instead of django-versionfield