Default output to logs/YYYY_MM_DD_HH_MM_SS_<VIN>.log

When -o is omitted, the output file is auto-named from the run's
start timestamp and the vehicle VIN and placed under ./logs/,
which is created on demand.  logs/ is gitignored.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,3 +1,4 @@
 .idea/
 credentials/
-vehicle_data.json
+vehicle_data.json
+logs/

collect.py

@@ -12,7 +12,10 @@ Usage examples
   export WC_USER=me@example.com WC_PASS=secret
   python collect.py
 
-# Credentials from a JSON file:
+# Credentials from a JSON file (output auto-named under ./logs/):
+  python collect.py -c creds.json -i 600
+
+# Credentials from a JSON file, explicit output path:
   python collect.py -c creds.json -i 600 -o id3.json
 
 # Custom domains, 10-minute interval:
@@ -378,8 +381,6 @@ def run(args: argparse.Namespace) -> None:
         log.error("Unknown domain(s): %s.  Available: %s", unknown, list(ALL_DOMAINS))
         sys.exit(1)
 
-    out = Path(args.output)
-
     log.info("Connecting to WeConnect…")
     wc = weconnect.WeConnect(
         username=args.username,
@@ -410,6 +411,14 @@ def run(args: argparse.Namespace) -> None:
     vin = vehicle.vin.value
     log.info("Vehicle: %s", vin)
 
+    if args.output:
+        out = Path(args.output)
+    else:
+        logs_dir = Path("logs")
+        logs_dir.mkdir(exist_ok=True)
+        stamp = datetime.now().strftime("%Y_%m_%d_%H_%M_%S")
+        out = logs_dir / f"{stamp}_{vin}.log"
+
     store = load_store(out, vin, args.interval)
     log.info(
         "Collecting [%s] every %ds → %s  (Ctrl-C to stop)",
@@ -487,9 +496,9 @@ def main() -> None:
     )
     p.add_argument(
         "-o", "--output",
-        default="vehicle_data.json",
+        default=None,
         metavar="FILE",
-        help="Output JSON file (default: vehicle_data.json)",
+        help="Output file (default: logs/YYYY_MM_DD_HH_MM_SS_<VIN>.log)",
     )
     p.add_argument(
         "--max-records",