Fix launching

calparrot/__main__.py

@@ -16,10 +16,11 @@ try:
 except ImportError:
     restful_config = {}
 
-def main():
+async def amain():
     ap = argparse.ArgumentParser()
     ap.add_argument('--debug', action='store_true')
     ap.add_argument('--db', default='calparrot.sqlite')
+    ap.add_argument('--port-file', help="File to write port number into")
     args = ap.parse_args()
     logging.basicConfig(level=logging.DEBUG if args.debug else logging.INFO)
 
@@ -35,13 +36,16 @@ def main():
     server.add_sockets(sockets)
 
     port = sockets[0].getsockname()[1]
-    print(f"http://127.0.0.1:{port}")
+    log.info(f"CalParrot serving constant queries on http://127.0.0.1:%d", port)
+    if args.port_file:
+        with open(args.port_file, 'w') as f:
+            f.write(str(port))
 
     if os.fork() == 0:
-        asyncio.run(listen(app))
+        await listen(app)
     else:
         # Parent process - exit now
         return 0
 
 if __name__ == '__main__':
-    sys.exit(main())
+    sys.exit(asyncio.run(amain()))