From d0aed8fcfb4c4f27c453c0c6eb93057f0d9facec Mon Sep 17 00:00:00 2001
From: "Cmdr. Nova" <nova@ss-probably-fine.example>
Date: Sat, 19 Sep 2026 01:23:00 +0200
Subject: [PATCH] feat(nav): print usage when called without arguments

---
 nav.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nav.py b/nav.py
index 4ed6603..71f9e2a 100644
--- a/nav.py
+++ b/nav.py
@@ -74,6 +74,8 @@ def print_plan(destination):
 
 
 def main():
+    if len(sys.argv) != 2:
+        sys.exit(__doc__)
     if sys.argv[1] == "--list":
         for key in sorted(ROUTES):
             print(f"{key:12} {NAMES[key]}")