Send a reminder to innactive threads

This sends a reminder message to any thread with 1 or less messages

This picks up only active threads too

matchy/cogs/matcher.py

@@ -223,10 +223,15 @@ class MatcherCog(commands.Cog):
             await match_groups_in_channel(msg_channel, min)
 
         # Send a reminder to threads for a match that happened two days ago
-        for (channel, min) in state.State.get_active_match_tasks(datetime.now() - timedelta(days=2)):
+        for (channel, _) in state.State.get_active_match_tasks(datetime.now() - timedelta(days=2)):
             logger.info("Sending reminders to threads in %s", channel)
             msg_channel = self.bot.get_channel(int(channel))
-            # TODO: Send a reminder per thread
+            # Find any threads that need
+            for thread in msg_channel.threads:
+                # Only regard threads the bot created
+                # And that have no additional messages
+                if thread.owner.id == self.bot.user.id and thread.message_count <= 1:
+                    await thread.send(strings.thread_reminder())
 
 
 # Increment when adjusting the custom_id so we don't confuse old users

matchy/cogs/strings.py

@@ -145,6 +145,16 @@ Make sure you're /pause'd if you need to be, or /join in ASAP!""",
 ]
 
 
+@randomised
+def thread_reminder(): return [
+    "Hey friends, just checking in! No worries if you're too busy this week",
+    "Bork bork, quick reminder in case y'all forgot!",
+    "Hey matchees, how's your week going?",
+    "Hey everyone, don't forget to check in with eachother!",
+    "Quick friendly nudge, how're you all doing?",
+]
+
+
 @randomised
 def matching(): return [
     "Matchy is matching matchees...",