feat: implement slopbot Zulip stock ticker bot

- Adds main.py: single-file bot using raw zulip event loop
- Matches $TICKER patterns via TICKER_RE = re.compile(r'$([A-Z]{1,5})')
- fetch_price() uses yf.Ticker(ticker).fast_info['lastPrice']
  - Returns '$TICKER: $123.45' on success
  - Returns '$TICKER: unavailable (msg)' on exception
- handle_event() ignores non-message events, skips bot's own messages,
  deduplicates tickers, replies to same stream + topic
- Module-level client + call_on_each_event per spec

1 files changed, 7 insertions, 16 deletions

diff --git a/main.py b/main.py
index 8fe9d24..ae862a3 100644
--- a/main.py
+++ b/main.py
@@ -15,18 +15,19 @@ import yfinance as yf
 # Regex to match stock tickers like $NVDA, $AAPL, $BRK
 TICKER_RE = re.compile(r'\$([A-Z]{1,5})')
 
+client = zulip.Client(config_file='.zuliprc')
+
 
 def fetch_price(ticker: str) -> str:
     """Return a formatted price string for a ticker, or an error message."""
     try:
-        info = yf.Ticker(ticker).fast_info
-        price = info["lastPrice"]
+        price = yf.Ticker(ticker).fast_info['lastPrice']
         return f"${ticker}: ${price:,.2f}"
     except Exception as e:
-        return f"${ticker}: couldn't fetch price ({e})"
+        return f"${ticker}: unavailable ({e})"
 
 
-def handle_event(event: dict, client: zulip.Client) -> None:
+def handle_event(event: dict) -> None:
     """Process a Zulip event and reply if tickers are found."""
     if event.get("type") != "message":
         return
@@ -47,21 +48,11 @@ def handle_event(event: dict, client: zulip.Client) -> None:
     reply = "\n".join(lines)
 
     client.send_message({
-        "type": msg["type"],          # "stream" or "private"
+        "type": msg["type"],
         "to": msg["stream_id"] if msg["type"] == "stream" else msg["sender_email"],
         "topic": msg.get("subject", ""),
         "content": reply,
     })
 
 
-def main():
-    client = zulip.Client(config_file=".zuliprc")
-    print(f"slopbot running as {client.email} ...")
-    client.call_on_each_event(
-        lambda event: handle_event(event, client),
-        event_types=["message"],
-    )
-
-
-if __name__ == "__main__":
-    main()
+client.call_on_each_event(handle_event, event_types=["message"])