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feat (pkg): don't allow hyphen in python pkg name #717

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@krsche krsche commented May 25, 2022

fixes #715

As @clalancette suggested to block creation of python pkgs with hyphens in the name I didn't implement a warning, but block them by returning early. Similar to what was being done for pkgs names test.

I didn't test this change locally as I didn't find instructions on how to install from source and it's such a minor change. Are there any instructions for installing from source / executing?

Should I add a unit test somewhere?

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Are there any instructions for installing from source / executing?

For this specific repository? There aren't any repo-specific steps for ros2cli, but you'd have to follow the regular workflow of creating a workspace to act as an overlay on top of your default ROS workspace: https://docs.ros.org/en/rolling/Tutorials/Workspace/Creating-A-Workspace.html, after which you can build/source/test your workspace with code from your fork of ros2cli.

Should I add a unit test somewhere?

Yes please. Unit tests for the ros2 pkg CLI are here: https://github.com/ros2/ros2cli/blob/master/ros2pkg/test/test_cli.py

'choose a different package name.'
if '-' in args.package_name:
# Python packages shouldn't include hyphens in their name, refer to PEP-8.
# Running a via script 'ros2 run' with hyphens in the executable or package name
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There is a linter warning in CI: Can you remove this trailing whitespace?

Suggested change
# Running a via script 'ros2 run' with hyphens in the executable or package name
# Running a via script 'ros2 run' with hyphens in the executable or package name

# directory the tests for the package go in.
return "Aborted since 'ament_python' packages can't be named 'test'. Please " + \
'choose a different package name.'
if '-' in args.package_name:
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This is one case, but node names with hyphens are also problematic.

ros2 pkg create test_pkg --build-type ament_python --node-name test-node # breaks

Can you address this case too?

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Very good catch, I forgot about that 😅

# Running a via script 'ros2 run' with hyphens in the executable or package name
# results in errors.
return "Aborted since 'ament_python' packages can't include hyphens ('-') in " + \
"their name (refer to PEP-8). Please choose a different package name."
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(refer to PEP-8)

Nit: PEP-8 package and module names doesn't explicitly recommend against using hyphens, and no reasoning for this case is provided there either, so I don't know if this is helpful.

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krsche commented May 25, 2022

Thanks for your review, I'll address your points tomorrow.

Regarding the pep-8 reference - I thought of that while writing as well.. It's more complicated though because technically calling my_module = __import__('my-module') should work while import my-module doesn't. But I've never seen that explicit __import__(...) call anywhere so I'd still say forbid it.
Also it probably would require quite some adjustment in the cli to make it work with ros2 run...

Should I just remove the pep-8 reference then?

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Also it probably would require quite some adjustment in the cli to make it work with ros2 run...

True, and I don't think it's worth the time trying to make that pathological case work.

Should I just remove the pep-8 reference then?

👍

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krsche commented May 26, 2022

Ok, will do. I won't get to it until next week though

@clalancette clalancette added the more-information-needed Further information is required label Jun 9, 2022
@audrow audrow changed the base branch from master to rolling June 28, 2022 14:23
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pkg create --build-type ament_python should warn about hyphens in pkg-name
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