Re-export __all__ in __init__.py for pure Rust project

guide/src/project_layout.md

@@ -22,7 +22,9 @@ wheel. For convenience, this file includes the following:
 ```python
 from .my_project import *
 
-__doc__ = .my_project.__doc__
+__doc__ = my_project.__doc__
+if hasattr(my_project, "__all__"):
+    __all__ = my_project.__all__
 ```
 
 such that the module functions may be called directly with:

src/module_writer.rs

@@ -656,7 +656,11 @@ pub fn write_bindings_module(
             writer.add_bytes(
                 &module.join("__init__.py"),
                 format!(
-                    "from .{module_name} import *\n\n__doc__ = {module_name}.__doc__\n",
+                    "from .{module_name} import *\n\
+                    \n\
+                    __doc__ = {module_name}.__doc__\n\
+                    if hasattr({module_name}, \"__all__\"):\n\
+                    \t__all__ = {module_name}.__all__\n",
                     module_name = module_name
                 )
                 .as_bytes(),

src/templates/__init__.py.j2

@@ -2,3 +2,5 @@ from .{{ crate_name }} import *
 
 
 __doc__ = {{ crate_name }}.__doc__
+if hasattr({{ crate_name }}, "__all__"):
+	__all__ = {{ crate_name }}.__all__