feat/nix writer

[blaggacao]

• wip: impl nix expr writer

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This is a WIP patch implementing a nix writer.

I'd like to hear feedback on if we could come up with a suitable extension point that would allow maintaining this out of tree (as a plugin, maybe).

[lilydjwg]

I'm OK with adding more information to RichResult, but with regard to the nix part. Can it be done via reading the json log output? Or maybe by reading an extended format of newver file?

[blaggacao]

Absolutely! That's great news about the possibility to extend the RichResult. Other than that, I have no real intention to upstream a nix-specific functionality, but it's a great way to figure out the API.

This still relies on a layer violation, to urlquoteplus vslues that come from nvfetcjer_sources, so it needs more thought and refinememt.

I'll separate the RichResult enhancemsnts into a separate PR, and then iterate further. 👍

[lilydjwg]

This is intended to make updated items standout.

[blaggacao]

I see! In my use case scenario, it's the rule to only update a single item, hence users where suggesting to actually show something, because otherwise there wouldn't be any output, at all.

If not a single item is picked for update, this is less of a problem and it becomes clear that something had happened.

[lilydjwg]

Yes, but I didn't expect only one item is checked except for debugging. nvchecker was written with the goal to quickly check updates for thousands of items.

Maybe we can provide up-to-date feedback when --entry is used.

[blaggacao]

Good idea! I'll implement this! That makes a lot more sense!