Reply with list of existing reminders

remindme.py

@@ -14,6 +14,17 @@ from croniter import croniter
 help_text = """
 A very comprehensive help text
 """
+service_address = "remindme@friedersdorff.com"
+
+def empty_reply(msg):
+    reply = email.message.EmailMessage()
+    reply["Subject"] = f"RE: {msg['Subject']}"
+    reply["Message-ID"] = email.utils.make_msgid()
+    reply["In-Reply-To"] = msg["Message-ID"]
+    reply["References"] = msg["Message-ID"]
+    reply["To"] = msg["Reply-To"] or msg["From"]
+    reply["From"] = service_address
+    return reply
 
 
 def ack_message(uid, message, client):
@@ -25,16 +36,26 @@ def ack_message(uid, message, client):
 
     payload = msg.get_payload().strip()
     if payload.startswith("help"):
-        print("We should help")
-        reply = email.message.EmailMessage() 
+        reply = empty_reply(msg)
         reply.set_content(help_text)
-        reply["Subject"] = f"Help for remindme service (was {msg['Subject']})"
-        reply["Message-ID"] = email.utils.make_msgid()
-        reply["In-Reply-To"] = msg["Message-ID"]
-        reply["References"] = msg["Message-ID"]
-        reply["To"] = msg["Reply-To"] or msg["From"]
-        reply["From"] = "remindme@friedersdorff.com"
         return reply, True
+
+    if payload.startswith("list"):
+        persons_messages = client.fetch(
+            client.search(["FROM", msg["From"]]), "RFC822"
+        )
+        reminders = []
+        for uid, reminder in persons_messages.items():
+            reminder = email.message_from_bytes(reminder[b"RFC822"])
+            reminders.append(
+                (reminder["Subject"], reminder.get_payload().strip())
+            )
+        reply = empty_reply(msg)
+        reply.set_content("\n".join(
+            [f"({i}) {r[0]}: {r[1]}" for i, r in enumerate(reminders)]
+        ))
+        return reply, True
+
     if payload.startswith("repeat"): 
         try:
             print(get_description(payload))