configure output file

main.py

@@ -261,7 +261,9 @@ def fetch(replay: str, cache: bool = True) -> Replay:
 
 def main():
     parser = argparse.ArgumentParser(
-        prog=APP, description="extracts stats from a Showdown replay"
+        prog=APP,
+        description="extracts stats from a Showdown replay",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
     )
     parser.add_argument("-v", "--verbose", action="count", help="add debugging info")
     parser.add_argument(
@@ -270,6 +272,14 @@ def main():
         action="store_true",
         help="fetch replays instead of using cache",
     )
+    parser.add_argument(
+        "-o",
+        "--output",
+        action="store",
+        metavar="FILE",
+        default="data.db",
+        help="output data file",
+    )
     parser.add_argument("replay", nargs="+", help="replay ID or URL")
 
     args = parser.parse_args(sys.argv[1:])
@@ -279,7 +289,7 @@ def main():
         LOG.setLevel(logging.DEBUG)
 
     try:
-        db = sqlite3.connect("data.db")
+        db = sqlite3.connect(args.output)
         _init_db(db)
 
         for r in args.replay: