shell_task decorator

docs/input_spec.rst

@@ -174,8 +174,9 @@ In the example we used multiple keys in the metadata dictionary including `help_
    (a specific input field will be sent).
 
 
-Validators
-----------
-Pydra allows for using simple validator for types and `allowev_values`.
-The validators are disabled by default, but can be enabled by calling
-`pydra.set_input_validator(flag=True)`.
+`shell_arg` Function
+--------------------
+
+For convenience, there is a function in `pydra.mark` called `shell_arg()`, which will
+takes the above metadata values as arguments and inserts them into the metadata passed
+to `attrs.field`. This can be especially useful when using an IDE with code-completion.

pydra/mark/__init__.py

@@ -1,3 +1,4 @@
 from .functions import annotate, task
+from .shell import shell_task, shell_arg, shell_out
 
-__all__ = ("annotate", "task")
+__all__ = ("annotate", "task", "shell_task", "shell_arg", "shell_out")