added flag to fail if users use regular transpile after installing switch

Author: sundarshankar89

src/databricks/labs/lakebridge/cli.py

@@ -235,16 +235,20 @@ def _validate_transpiler_config_path(transpiler_config_path: str, msg: str) -> N
     def use_transpiler_config_path(self, transpiler_config_path: str | None) -> None:
         if transpiler_config_path is not None:
             logger.debug(f"Setting transpiler_config_path to: {transpiler_config_path!r}")
-            # Switch is installed inside "/Users/<>/.lakebridge/transpilers/Switch/lsp/config.yml
-            if Path(transpiler_config_path).parent.parent.name == "Switch":
-                msg = "Switch transpiler is not supported through `transpile` run `llm-transpile` instead."
-                raise_validation_exception(msg)
             self._validate_transpiler_config_path(
                 transpiler_config_path,
                 f"Invalid path for '--transpiler-config-path', does not exist: {transpiler_config_path}",
             )
             self._config = dataclasses.replace(self._config, transpiler_config_path=transpiler_config_path)
 
+        # Switch is installed inside "/Users/<>/.lakebridge/transpilers/Switch/lsp/config.yml
+        if (
+            self._config.transpiler_config_path is not None
+            and Path(self._config.transpiler_config_path).parent.parent.name == "Switch"
+        ):
+            msg = "Switch transpiler is not supported through `transpile` run `llm-transpile` instead."
+            raise RuntimeError(msg)
+
     def use_source_dialect(self, source_dialect: str | None) -> None:
         if source_dialect is not None:
             # Defer validation: depends on the transpiler config path, we'll deal with this later.