From 910e08e0925e2e3f937eeb41133e87226c69992a Mon Sep 17 00:00:00 2001
From: Saurav <96974754+sauravkeshrii@users.noreply.github.com>
Date: Thu, 12 Feb 2026 17:28:36 +0000
Subject: [PATCH] Add usage message when script is run without arguments

---
 scripts/world_create.py | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/scripts/world_create.py b/scripts/world_create.py
index 7595e9e..cbfa399 100755
--- a/scripts/world_create.py
+++ b/scripts/world_create.py
@@ -225,13 +225,19 @@ def read_template(temp_file_name):
 
 if __name__ == '__main__':
 
-    arg_list = sys.argv
+    # Check for required command-line argument
+    if len(sys.argv) < 2:
+        print("Usage: world_create.py <world_name> [invert]")
+        print("  <world_name> : name of the world file to create (e.g., my_world.world)")
+        print("  [invert]     : optional flag to invert image (default: no inversion)")
+        sys.exit(1)
 
+    arg_list = sys.argv
     world_name = arg_list[1]
     invert = False
-    if (len(arg_list) > 2):
+    if len(arg_list) > 2:
         flag = arg_list[2]
-        if (flag == "invert"):
+        if flag == "invert":
             invert = True
 
     rospack = rospkg.RosPack()
@@ -251,4 +257,4 @@ def read_template(temp_file_name):
     # Double inversion for image preservation
 
     # rescale_and_resize(heightmap_path, img_size)
-    print('Done')
+    print('Done')
\ No newline at end of file