meta/meeting-notes/2025-04-16_development-notes.md

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Attendees: @kiara @fricklerhandwerk
- adapted semantics of JSON schema conversion to the module system: https://git.clan.lol/clan/clan-core/pulls/3335
- fixed some build issues in https://git.fediversity.eu/Fediversity/Fediversity/pulls/307
- got form rendering to work again in https://git.fediversity.eu/Fediversity/Fediversity/pulls/285
- also minor cleanups on the way to getting it mergeable
- discussed considerations of mapping NixOS modules to UI elements
- problem: NixOS modules don't have a notion of field label (important for forms) and the best we can currently do is derive it from the attribute name (meh)
- related work by @hsjobeki:
- https://discourse.nixos.org/t/zurich-24-11-zhf-hackathon-report/59250#p-197228-on-user-interfaces-for-nixos-configurations-6
- https://github.com/NixOS/nixpkgs/pull/341199
- @fricklerhandwerk: not convinced that adding more hard-coded fields to module options is the right way
- it's ad hoc, where does it end?
- the problem statement is relevant though, we need to somehow annotate presentation aspects
- @kiara: https://rjsf-team.github.io/react-jsonschema-form/ implements these annotations
- @fricklerhandwerk: textual references are a maintenance burden; opportunity for human error
- sketched an idea for structural annotations using a module system wrapper:
```nix
let
fancy-wrapper = go-wild (
{ lib, ... }:
let
inherit (lib) mkOption types;
in
{
options = {
initialUser = mkOption {
type = types.submodule {
options = {
displayName = mkOption {
type = types.str;
description = "Display name of the user";
meta.ui = lib.mkOptionMeta {
type = types.uiSchema;
value = {
title = "Display name";
};
};
};
};
});
in
{
module-options = fancy-wrapper.module;
annotations = fancy-wrapper.annotations;
}
```
The `fancy-wrapper` would inject a custom `lib` where module-system-related functions will essentially act as `id` to preserve the information passed to them. On its outputs it will
- reconstruct the module specification, throwing away the `meta` annotations
- splice out the `meta` annotations and convert them to regular modules with the appropriate fields
Then, the value of `fancy-wrapper.annotations` would mirror the stuctrue of the module in the example be equivalent to something along the lines of:
```nix
{ lib, ... }
let
inherit (lib) mkOption types;
in
{
options = {
initialUser = {
displayName = mkOption {
type = types.uiSchema;
default = {
label = "Display name";
};
};
};
};
}
```
Matching up the string identifiers could then be done programmatically by a function (supplied with the fancy wrapper library for use within the Nix language), so humans would be out of the loop.