Move new syntax behind decorator_syntax feature

Signed-off-by: Alice Purcell <alicederyn@gmail.com>

docs/examples/workflows/experimental/pydantic_io_in_dag_context.md

@@ -21,7 +21,7 @@
     from hera.workflows import DAG, Parameter, WorkflowTemplate, script
     from hera.workflows.io.v1 import Input, Output
 
-    global_config.experimental_features["script_pydantic_io"] = True
+    global_config.experimental_features["decorator_syntax"] = True
 
 
     class CutInput(Input):

docs/examples/workflows/experimental/pydantic_io_in_steps_context.md

@@ -21,7 +21,7 @@
     from hera.workflows import Parameter, Steps, WorkflowTemplate, script
     from hera.workflows.io.v1 import Input, Output
 
-    global_config.experimental_features["script_pydantic_io"] = True
+    global_config.experimental_features["decorator_syntax"] = True
 
 
     class CutInput(Input):

examples/workflows/experimental/pydantic_io_in_dag_context.py

@@ -11,7 +11,7 @@
 from hera.workflows import DAG, Parameter, WorkflowTemplate, script
 from hera.workflows.io.v1 import Input, Output
 
-global_config.experimental_features["script_pydantic_io"] = True
+global_config.experimental_features["decorator_syntax"] = True
 
 
 class CutInput(Input):

examples/workflows/experimental/pydantic_io_in_steps_context.py

@@ -11,7 +11,7 @@
 from hera.workflows import Parameter, Steps, WorkflowTemplate, script
 from hera.workflows.io.v1 import Input, Output
 
-global_config.experimental_features["script_pydantic_io"] = True
+global_config.experimental_features["decorator_syntax"] = True
 
 
 class CutInput(Input):

src/hera/workflows/script.py

@@ -40,6 +40,7 @@
 from hera.expr import g
 from hera.shared import BaseMixin, global_config
 from hera.shared._global_config import (
+    _DECORATOR_SYNTAX_FLAG,
     _SCRIPT_ANNOTATIONS_FLAG,
     _SCRIPT_PYDANTIC_IO_FLAG,
     _flag_enabled,
@@ -378,15 +379,19 @@ def _get_parameters_from_callable(source: Callable) -> List[Parameter]:
     return parameters
 
 
+def please_enable_experimental_feature(flag: str) -> str:
+    return (
+        "Please turn on experimental features by setting "
+        f'`hera.shared.global_config.experimental_features["{flag}"] = True`.'
+        " Note that experimental features are unstable and subject to breaking changes."
+    )
+
+
 def _assert_pydantic_io_enabled(annotation: str) -> None:
     if not _flag_enabled(_SCRIPT_PYDANTIC_IO_FLAG):
         raise ValueError(
-            (
-                "Unable to instantiate {} since it is an experimental feature."
-                " Please turn on experimental features by setting "
-                '`hera.shared.global_config.experimental_features["{}"] = True`.'
-                " Note that experimental features are unstable and subject to breaking changes."
-            ).format(annotation, _SCRIPT_PYDANTIC_IO_FLAG)
+            f"Unable to instantiate {annotation} since it is an experimental feature. "
+            + please_enable_experimental_feature(_SCRIPT_PYDANTIC_IO_FLAG)
         )
 
 
@@ -767,6 +772,11 @@ def task_wrapper(*args, **kwargs) -> Union[FuncR, Step, Task, None]:
             """Invokes a `Script` object's `__call__` method using the given SubNode (Step or Task) args/kwargs."""
             if _context.active:
                 if len(args) == 1 and isinstance(args[0], (InputV1, InputV2)):
+                    if not _flag_enabled(_DECORATOR_SYNTAX_FLAG):
+                        raise SyntaxError(
+                            "Cannot pass a Pydantic type inside a context. "
+                            + please_enable_experimental_feature(_DECORATOR_SYNTAX_FLAG)
+                        )
                     arguments = args[0]._get_as_arguments()
                     arguments_list = [
                         *(arguments.artifacts or []),

tests/test_pydantic_io_syntax.py → tests/test_pydantic_io_workflow_syntax.py

@@ -1,6 +1,6 @@
 import pytest
 
-from hera.shared._global_config import _SCRIPT_PYDANTIC_IO_FLAG
+from hera.shared._global_config import _DECORATOR_SYNTAX_FLAG
 from hera.workflows import Input, Output, Steps, Workflow, script
 
 
@@ -14,7 +14,7 @@ class IntOutput(Output):
 
 @pytest.fixture(autouse=True)
 def enable_pydantic_io(global_config_fixture):
-    global_config_fixture.experimental_features[_SCRIPT_PYDANTIC_IO_FLAG] = True
+    global_config_fixture.experimental_features[_DECORATOR_SYNTAX_FLAG] = True
 
 
 def test_output_field_contains_argo_template(global_config_fixture):