Setting that allows to specify sub directories as part of the same module

[ttytm]

Describe the feature

The FR is about adding the possibility that files in subdirectories can belong to one module.
It ties in with an announcement in conversation on discord some months ago: https://discord.com/channels/592103645835821068/592294828432424960/1096096129990533181

Use Case

• Visibility control, to create clear user APIs. I want an east way to keep private parts private. Having to set things to public that are intended for library internal usage just for the reason of organising files into directories feels like a better solution should be integrated.
• Falling back on a flat directory structure with prefixes can be a go-to solution - but this looks like a freaking Visual Basic project. Organization would become simpler and cleaner if things that belong to one module can still be organized into a subdir.

Proposed Solution

When Alex mentioned the integration would involve a setting in the v.mod file. I think the solution would look something like allowing to specify subdirectories that belong to a module in the v.mod file of that module. Then adding a check might not be too complicated that the module of the files in the subdir matches with that setting.

Other Information

The feature didn't receive attention since it was mentioned on discord. Back then I thought this is one of my personal most wanted features. It would make V better than Go in more aspects.

Putting it on the Roadmap would be a great first step.

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

0.4.3

Environment details (OS name and version, etc.)

any

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