Remove obsolete command to delete tutorial streams.

We don't have tutorial-bot anymore, so this is no longer needed.

(imported from commit b8a1bc9c2379a451e8cc1ed43b15f373bb3f2b06)

zerver/management/commands/delete_tutorial_streams.py

@@ -1,53 +0,0 @@
-from __future__ import absolute_import
-
-from django.core.management.base import BaseCommand
-from zerver.models import Subscription, Recipient, Message, Stream, \
-    get_user_profile_by_email
-from django.db.models import Q
-
-import datetime
-import pytz
-from optparse import make_option
-
-class Command(BaseCommand):
-    help = """Delete all inactive tutorial stream subscriptions."""
-
-    option_list = BaseCommand.option_list + (
-        make_option('-f', '--for-real',
-                    dest='for_real',
-                    action='store_true',
-                    default=False,
-                    help="Actually deactive subscriptions. Default is a dry run."),
-        )
-
-    def has_sent_to(self, user_profile, recipient):
-        return Message.objects.filter(sender=user_profile, recipient=recipient).count() != 0
-
-    def handle(self, **options):
-        possible_tutorial_streams = Stream.objects.filter(Q(name__startswith='tutorial-'))
-
-        tutorial_bot = get_user_profile_by_email("tutorial-bot@zulip.com")
-
-        for stream in possible_tutorial_streams:
-            recipient = Recipient.objects.get(type=Recipient.STREAM, type_id=stream.id)
-            subscribers = Subscription.objects.filter(recipient=recipient, active=True)
-            if ((subscribers.count() == 1) and self.has_sent_to(tutorial_bot, recipient)):
-                # This is a tutorial stream.
-                most_recent_message = Message.objects.filter(
-                    recipient=recipient).latest("pub_date")
-                # This cutoff must be more generous than the tutorial bot cutoff
-                # in the client code.
-                cutoff = datetime.datetime.now(tz=pytz.utc) - datetime.timedelta(hours=2)
-
-                if most_recent_message.pub_date < cutoff:
-                    # The tutorial has expired, so delete the stream.
-                    print stream.name, most_recent_message.pub_date
-                    if options["for_real"]:
-                        tutorial_user = subscribers[0]
-                        tutorial_user.active = False
-                        tutorial_user.save(update_fields=["active"])
-
-        if options["for_real"]:
-            print "Subscriptions deactivated."
-        else:
-            print "This was a dry run. Pass -f to actually deactivate."