from __future__ import absolute_import, unicode_literals

from django.apps import apps
from django.core.exceptions import ImproperlyConfigured

from compressor.conf import settings


if apps.is_installed("django.contrib.staticfiles"):
    from django.contrib.staticfiles import finders  # noqa

    if ("compressor.finders.CompressorFinder"
            not in settings.STATICFILES_FINDERS):
        raise ImproperlyConfigured(
            "When using Django Compressor together with staticfiles, "
            "please add 'compressor.finders.CompressorFinder' to the "
            "STATICFILES_FINDERS setting.")
else:
    finders = None  # noqa