countdown: let reminders be recurring

when creating a reminder, describe it as "and every X" and it'll refire
over that period, rather than only firing once

closes bss/dr.botzo#30

countdown/ircplugin.py

@@ -21,6 +21,7 @@ class Countdown(Plugin):
     """Report on countdown items."""
 
     new_reminder_regex = (r'remind\s+(?P<who>[^\s]+)\s+(?P<when_type>at|in|on)\s+(?P<when>.*?)\s+'
+                          r'(and\s+every\s+(?P<recurring_period>.*?)\s+)?'
                           r'(to|that|about)\s+(?P<text>.*)')
 
     def __init__(self, bot, connection, event):
@@ -75,7 +76,15 @@ class Countdown(Plugin):
                 if reminder.at_time <= timezone.now():
                     log.info("sending %s to %s", reminder.reminder_message, reminder.reminder_target)
                     self.bot.reply(None, reminder.reminder_message, explicit_target=reminder.reminder_target)
-                    reminder.sent_reminder = True
+
+                    # if recurring, set a new at time, otherwise stop reminding
+                    if reminder.recurring_period != '':
+                        calendar = pdt.Calendar()
+                        when_t = calendar.parseDT(reminder.recurring_period, reminder.at_time,
+                                                  tzinfo=reminder.at_time.tzinfo)[0]
+                        reminder.at_time = when_t
+                    else:
+                        reminder.sent_reminder = True
                     reminder.save()
             time.sleep(1)
 
@@ -100,6 +109,7 @@ class Countdown(Plugin):
                 who = match.group('who')
                 when_type = match.group('when_type')
                 when = match.group('when')
+                recurring_period = match.group('recurring_period')
                 text = match.group('text')
                 log.debug("%s / %s / %s", who, when, text)
 
@@ -126,6 +136,9 @@ class Countdown(Plugin):
 
                 countdown_item = CountdownItem.objects.create(name=item_name, at_time=when_t, is_reminder=True,
                                                               reminder_message=message, reminder_target=sent_location)
+                if recurring_period:
+                    countdown_item.recurring_period = recurring_period
+                countdown_item.save()
                 log.info("created countdown item %s", str(countdown_item))
 
                 if in_privmsg:

countdown/migrations/0004_countdownitem_recurring_period.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-02-24 01:06
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('countdown', '0003_auto_20170222_2025'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='countdownitem',
+            name='recurring_period',
+            field=models.CharField(default='', max_length=64),
+        ),
+    ]

countdown/models.py

@@ -21,6 +21,8 @@ class CountdownItem(models.Model):
     reminder_message = models.TextField(default="")
     reminder_target = models.CharField(max_length=64, default='')
 
+    recurring_period = models.CharField(max_length=64, default='')
+
     created_time = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):