Add pong metadata

echo.py

@@ -1,13 +1,15 @@
 from typing import Optional
 from time import time
 
+from mautrix.types import TextMessageEventContent, MessageType
+
 from maubot import Plugin, MessageEvent
 from maubot.handlers import command
 
 
 class EchoBot(Plugin):
     @staticmethod
-    def plural(num: int, unit: str, decimals: Optional[int] = None) -> str:
+    def plural(num: float, unit: str, decimals: Optional[int] = None) -> str:
         num = round(num, decimals)
         if num == 1:
             return f"{num} {unit}"
@@ -15,8 +17,7 @@ class EchoBot(Plugin):
             return f"{num} {unit}s"
 
     @classmethod
-    def time_since(cls, ms: int) -> str:
-        diff = int(time() * 1000) - ms
+    def prettify_diff(cls, diff: int) -> str:
         if abs(diff) < 10 * 1_000:
             return f"{diff} ms"
         elif abs(diff) < 60 * 1_000:
@@ -26,13 +27,24 @@ class EchoBot(Plugin):
             return f"{cls.plural(minutes, 'minute')} and {cls.plural(seconds, 'second')}"
         hours, minutes = divmod(minutes, 60)
         if abs(hours) < 24:
-            return f"{cls.plural(hours, 'hour')}, {cls.plural(minutes, 'minute')} and {cls.plural(seconds, 'second')}"
+            return (f"{cls.plural(hours, 'hour')}, {cls.plural(minutes, 'minute')}"
+                    f" and {cls.plural(seconds, 'second')}")
         days, hours = divmod(hours, 24)
-        return f"{cls.plural(days, 'day')}, {cls.plural(hours, 'hour')}, {cls.plural(minutes, 'minute')} and {cls.plural(seconds, 'second')}"
+        return (f"{cls.plural(days, 'day')}, {cls.plural(hours, 'hour')}, "
+                f"{cls.plural(minutes, 'minute')} and {cls.plural(seconds, 'second')}")
 
     @command.new("ping", help="Ping")
     async def ping_handler(self, evt: MessageEvent) -> None:
-        await evt.reply(f"Pong! (ping took {self.time_since(evt.timestamp)} to arrive)")
+        diff = int(time() * 1000) - evt.timestamp
+        content = TextMessageEventContent(msgtype=MessageType.NOTICE,
+                                          body="Pong! (ping took "
+                                          f"{self.prettify_diff(diff)} to arrive)")
+        content["pong"] = {
+            "ms": diff,
+            "from": evt.sender.split(":", 1)[1],
+            "ping": evt.event_id,
+        }
+        await evt.reply(content)
 
     @command.new("echo", help="Repeat a message")
     @command.argument("message", pass_raw=True)