Support ament_cmake_python for pkg create

[m12watanabe1a]

About this PR

• Implement new argument --template-name for selecting different template
• Giving '?' shows the list of the available template
• Support new template ament_cmake_python

Related Issue

#739

How to use

ros2 pkg create --build-type ament_cmake --template-name ament_cmake_python my_project

This command will genrate,

.
└── my_project
    ├── CMakeLists.txt
    ├── package.xml
    └── my_project
        └── __init__.py

Both <node_name> or <library_name> given in the cli will generate node or library in cpp.

[clalancette]

As far as I can see, there is no package type called ament_cmake_python. For all of our python packages that are built using CMake, the package.xml type is just ament_cmake (one example)

@m12watanabe1a Can you explain more about what you are trying to accomplish here?

[m12watanabe1a]

@clalancette Thank you for reviewing.

I tired to newly support for ament_cmake_python in ros2 pkg create command since there is a demand in the linked issue.

#739

Feature description
ROS2 CLI allows creating packages for cmake, ament_cmake, ament_python. Considering there isn't a complete example in the documentation for ament_cmake_python , it would be helpful to support generating one for users.

[clalancette]

There are currently no instances of ROS 2 packages where this would be true. That is, package.get_build_type() will never return ament_cmake_python.

That said, it would still be worthwhile to have some way to create a package template for a Python package using CMake. However, it will have to be done a different way because it will use a build_type of ament_cmake. Maybe we can add in a new command-line argument that tells it to generate Python installation stuff in the CMakeLists.txt?

[m12watanabe1a]

Maybe we can add in a new command-line argument that tells it to generate Python installation stuff in the CMakeLists.txt?

I see. I agree with that build_type is not appropriate field for generating templates.

So maybe something like like,

ros2 pkg create --build-type ament_cmake --template-name ament_cmake_python <package_name>

[sloretz]

I added an agenda item to the next ROS 2 meeting to get feedback on the naming of --template-name , afterwards the ros2cli maintainers will be assigned to review. 🧇

Thank you for your patience!

[m12watanabe1a]

Thank you so much 🙏