feat: add inputs' and self' aspects

[HeitorAugustoLN]

Adds inputs' and self' aspects

[Copilot]

Pull request overview

This PR adds support for inputs' and self' context variables throughout the module system without relying on specialArgs. The implementation uses the withSystem function to inject system-specific inputs and self references into module contexts.

• Introduces withSystem parameter to enable per-system context injection
• Wraps mainModule creation with withSystem to provide inputs' and self' from flake-parts
• Threads the new context variables through all dependency and integration functions

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
modules/options.nix	Adds withSystem parameter and passes it to _types.nix
modules/_types.nix	Wraps mainModule function with withSystem to inject inputs' and self' into aspect context
modules/aspects/provides/home-manager.nix	Updates homeManager function to accept and forward inputs' and self' parameters
modules/aspects/dependencies.nix	Updates all dependency functions (osDependencies, osUserDependencies, hmUserDependencies, hmStandaloneDependencies) to accept and propagate inputs' and self'

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[vic]

Hey, thanks for the PR!

• I'm currently trying to decouple as much as possible from flake-parts and trying to reduce dependencies on it and its idioms. In the future I'd like den to be able to work without flakes and without flake-parts, so people using den will be able to choose if using flake-parts, or just evalModules like dendritic-unflake does or falake.

• What is the specific use for self' or inputs' in this PR ? I mean, if people can use the module-system to have access both of them why should Den include them as this PR does?

I'm still working on decoupling flake-file from flakes (using unflake) but will keep this open and take a more deeper look later.

[vic]

Den has a test suite now, and each feature is tested. Could you provide a test that shows it is NOT possible to use inputs'/self' unless we merge this PR ?

[HeitorAugustoLN]

It is really not possible currently, but yeah, it won't be supported for configurations that aren't using flake-parts, so I will just use inputs.input.packages.${host.system}.package

[vic]

Can you show me an example of where you are trying to use it and are unable to ? How about using withSystem instead ?

We currently depend on withSystem, see

den/modules/config.nix

Line 31 in 3ec4327

withSystem home.system (

[HeitorAugustoLN]

Can you show me an example of where you are trying to use it and are unable to?

I can use it in perSystem or by using withSystem, so if I want to use it in an aspect I would have to use withSystem, but then it would be too verbose.

I currently have one use case that is basically importing my wrapped neovim from another flake with home.packages = [ inputs'.neovim.packages.default ];. since I haven't migrated yet to a dendritic approach, I use specialArgs in https://github.com/HeitorAugustoLN/nix-config/blob/1741a49777865cd1472ba3ad3d207b3dfe9c1abe/flake/configurations.nix#L139-L166

[vic]

I haven't tried it but if withSystem gives you access to inputs' could we have a simple aspect that just exposes it ?

I'd prefer if we made something like this possible:

{ withSystem, ... }: {
  den.aspects.provide-system-self = {
    _module.args.self' = (withSystem { self', ... }: self');
  };
}

But we extending a module that is included in all aspects, so all have access to this self' , what do you think ?

In other words: being able to contribute to a module that is part of all aspects ? Is it den.default ?

[HeitorAugustoLN]

Fixed the aspect issue, any thoughts on why it fails on darwin?

[HeitorAugustoLN]

Ok, I understood what went wrong, the host and home we are checking is x86_64-linux only, when we run it through perSystem it uses its respective system such as aarch64-darwin, but the host and home still uses the same system as before

[vic]

Awesome! I'm merging this!

Can I ask for another favor ? Please update the wiki documentation just so we have a way for people to discover den._.inputs' and den._.self'.

Thanks!

[HeitorAugustoLN]

Where is it?

[vic]

Here: https://github.com/vic/den/wiki (it was private haha)

[vic]

Get published on any file change at https://den.oeiuwq.com/

[HeitorAugustoLN]

Ok!

[HeitorAugustoLN]

I improved the descriptions of these aspects in #118, also I am not able to edit the wiki apparently

[vic]

Oh, Ok. I'll update then wiki tomorrow then. Thanks so much I'll also merge #118