cli: support sglang version (#17250)

python/sglang/version.py

@@ -1,6 +1,24 @@
 try:
     from sglang._version import __version__, __version_tuple__
 except ImportError:
-    # Fallback for development without build
-    __version__ = "0.0.0.dev0"
-    __version_tuple__ = (0, 0, 0, "dev0")
+    try:
+        import importlib.metadata
+
+        __version__ = importlib.metadata.version("sglang")
+        __version_tuple__ = tuple(__version__.split("."))
+    except Exception:
+        try:
+            import pathlib
+
+            from setuptools_scm import get_version
+
+            # point to the directory containing pyproject.toml.
+            project_root = pathlib.Path(__file__).parent.parent.parent
+            __version__ = get_version(
+                root=str(project_root), fallback_version="0.0.0.dev0"
+            )
+            __version_tuple__ = tuple(__version__.split("."))
+        except Exception:
+            # Fallback for development without build
+            __version__ = "0.0.0.dev0"
+            __version_tuple__ = (0, 0, 0, "dev0")