<aspect>.<class> Transposition for Dendritic Nix#

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In aspect-oriented Dendritic setups, it is common to expose modules using the structure flake.modules.<class>.<aspect>.

However, for many users, a transposed attribute set, <aspect>.<class>, can be more intuitive. It often feels more natural to nest classes within aspects rather than the other way around.

This project provides a small, dependency-free transpose primitive that is powerful enough to implement cross-aspect dependencies for any Nix configuration class. It also includes a flake-parts module that transforms flake.aspects into flake.modules.

flake.aspects { vim-btw = { nixos = ...; darwin = ...; homeManager = ...; nixvim = ...; }; tiling-desktop = { nixos = ...; darwin = ...; }; macos-develop = { darwin = ...; hjem = ...; }; }

flake.modules { nixos = { vim-btw = ...; tiling-desktop = ...; }; darwin = { vim-btw = ...; tiling-desktop = ...; macos-develop = ...; }; homeManager = { vim-btw = ...; }; hjem = { macos-develop = ...; }; nixvim = { vim-btw = ...; }; }

Unlike flake.modules.<class>.<aspect> which is flat, aspects form a tree via provides (alias: _) and a graph via includes.

Quick Start#

# flake.nix
{
  inputs.flake-aspects.url = "github:vic/flake-aspects";
  outputs = { flake-parts, flake-aspects, nixpkgs, ... }@inputs:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [ flake-aspects.flakeModule ];
      flake.aspects = { aspects, ... }: {
        my-desktop = {
          nixos  = { };
          darwin = { };
          includes = [ aspects.my-tools ];
        };
        my-tools.nixos = { };
      };
    };
}

Also works without flakes via new-scope and lib.evalModules.

Documentation#

Full documentation

Testing#

nix run github:vic/checkmate#fmt --override-input target .
nix flake check github:vic/checkmate --override-input target . -L