[diffusion] fix: make input/output file save paths configurable and disableable (#19580)

Co-authored-by: Mick <mickjagger19@icloud.com>

python/sglang/multimodal_gen/utils.py

@@ -34,6 +34,24 @@ logger = init_logger(__name__)
 
 T = TypeVar("T")
 
+
+def expand_path_fields(obj) -> None:
+    """In-place expanduser on all dataclass fields whose name ends with '_path' or '_paths'."""
+    eu = os.path.expanduser
+    for f in fields(obj):
+        v = getattr(obj, f.name)
+        if f.name.endswith("_path") and isinstance(v, str):
+            setattr(obj, f.name, eu(v))
+        elif f.name.endswith("_path") and isinstance(v, list):
+            setattr(obj, f.name, [eu(x) if isinstance(x, str) else x for x in v])
+        elif f.name.endswith("_paths") and isinstance(v, dict):
+            setattr(
+                obj,
+                f.name,
+                {k: eu(p) if isinstance(p, str) else p for k, p in v.items()},
+            )
+
+
 # TODO(will): used to convert server_args.precision to torch.dtype. Find a
 # cleaner way to do this.
 PRECISION_TO_TYPE = {