common.nix/flake.nix

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
  };

  outputs = { nixpkgs, ... }:
    let
      lib = nixpkgs.lib;

      # Stolen from https://github.com/divnix/digga/blob/main/src/importers.nix
      rakeLeaves = dirPath:
        let
          seive = file: type:
            # Only rake `.nix` files or directories
            (type == "regular" && lib.hasSuffix ".nix" file) || (type == "directory");

          collect = file: type: {
            name = lib.removeSuffix ".nix" file;
            value =
              let
                path = dirPath + "/${file}";
              in
              if
                (type == "regular")
                || (type == "directory" && builtins.pathExists (path + "/default.nix"))
              then path
              # recurse on directories that don't contain a `default.nix`
              else rakeLeaves path;
          };

          files = lib.filterAttrs seive (builtins.readDir dirPath);
        in
        lib.filterAttrs (n: v: v != { }) (lib.mapAttrs' collect files);
    in
    {
      nixosModules = rakeLeaves ./modules;
    };
}