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split home-manager into their own submodules

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Danilo Reyes
2026-03-16 15:49:43 -06:00
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# Playbook: Split a Mixed Module into NixOS and Home Manager
- Name: Split a feature module into `nixos.nix` and `home.nix`
- Purpose: Keep category-first organization while separating system concerns from Home Manager concerns for standalone homes and future Darwin usage.
- Prerequisites: Identify the feature path, current toggle shape under `my.*`, and whether the module has shared helpers that should stay adjacent or move into a factory.
- Inputs: Existing mixed module path, target category/name, host toggle impact, Home Manager consumers, secrets/proxy requirements.
- Steps:
1. Create `modules/<category>/<name>/nixos.nix` for NixOS-only concerns such as `users.users`, `environment.systemPackages`, `services.*`, `programs.*`, firewall rules, and SOPS-backed system resources.
2. Create `modules/<category>/<name>/home.nix` for Home Manager concerns such as `programs.*`, `xdg.*`, `home.file.*`, `services.*` within Home Manager, and per-user shell aliases/config files.
3. Keep the toggle namespace aligned across both files so the same feature name remains recognizable. During migration, duplicate the option schema if needed rather than keeping Home Manager logic embedded in the NixOS module.
4. If the feature has truly shared logic, extract it into a local helper file within the feature directory or promote it into `modules/factories/` when reused across features.
5. Remove the legacy flat module only after the paired files evaluate cleanly and all references are updated.
- Validation:
- `modules/modules.nix` discovers the feature’s `nixos.nix`.
- `config/base.nix` registers `modules/home-manager.nix` in `home-manager.sharedModules`, and that loader discovers the feature’s `home.nix`.
- System-only settings no longer reference `home-manager.users.*`.
- Home Manager settings no longer depend on `osConfig` unless that coupling is intentional and documented.
- Outputs: Split module directory, retained toggle shape, and updated docs if the feature introduces new structure patterns.
- References: `docs/constitution.md` (Repository Overview, Terminology and Naming Standards, Maintenance Triggers), `docs/reference/index.md` (Module Directories, Auto-Import Rules)