Fixed a bunch of code inconsistencies

tools/asset/dmf/__main__.py

@@ -18,8 +18,8 @@ Usage:
   Reads raw vertex bytes from vertices.bin and writes a DMF file.
 """
 
+import argparse
 import struct
-import sys
 import os
 
 MAGIC = b'DMF\x00'
@@ -28,42 +28,36 @@ VERTEX_SIZE = 20
 
 
 def write_dmf(path, vertex_bytes):
-    if len(vertex_bytes) % VERTEX_SIZE != 0:
-        raise ValueError(
-            f"Vertex data size {len(vertex_bytes)} is not a "
-            f"multiple of {VERTEX_SIZE}"
-        )
-    vert_count = len(vertex_bytes) // VERTEX_SIZE
-    buf = bytearray()
-    buf += MAGIC
-    buf += struct.pack('<I', VERSION)
-    buf += struct.pack('<I', vert_count)
-    buf += vertex_bytes
-    with open(path, 'wb') as f:
-        f.write(buf)
-    print(
-        f'Wrote {path}: {vert_count} vertices, {len(buf)} bytes'
+  if len(vertex_bytes) % VERTEX_SIZE != 0:
+    raise ValueError(
+      f"Vertex data size {len(vertex_bytes)} is not a "
+      f"multiple of {VERTEX_SIZE}"
     )
-    return vert_count
+  vert_count = len(vertex_bytes) // VERTEX_SIZE
+  buf = bytearray()
+  buf += MAGIC
+  buf += struct.pack('<I', VERSION)
+  buf += struct.pack('<I', vert_count)
+  buf += vertex_bytes
+  with open(path, 'wb') as f:
+    f.write(buf)
+  print(
+    f'Wrote {path}: {vert_count} vertices, {len(buf)} bytes'
+  )
+  return vert_count
 
 
 def main():
-    args = sys.argv[1:]
-    if len(args) != 2:
-        print(
-            "Usage: python3 -m tools.asset.dmf "
-            "<output.dmf> <vertices.bin>"
-        )
-        sys.exit(1)
+  parser = argparse.ArgumentParser(description="Write a DMF (Dusk Mesh Format) file")
+  parser.add_argument('output', help='Path to output .dmf file')
+  parser.add_argument('vertices', help='Path to raw vertex bytes file')
+  args = parser.parse_args()
 
-    dst = args[0]
-    src = args[1]
+  with open(args.vertices, 'rb') as f:
+    vertex_bytes = f.read()
 
-    with open(src, 'rb') as f:
-        vertex_bytes = f.read()
-
-    write_dmf(dst, vertex_bytes)
+  write_dmf(args.output, vertex_bytes)
 
 
 if __name__ == '__main__':
-    main()
+  main()