nix-custom/flake.nix

{
  description = "Collection of custom Nix packages";

  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    wallpaper-engine-kde-plugin-lib = {
      flake = false;
      url = "git+https://github.com/catsout/wallpaper-engine-kde-plugin?submodules=1";
    };
    yorha-grub-theme = {
      flake = false;
      url = "github:OliveThePuffin/yorha-grub-theme";
    };
  };

  outputs = inputs@{ self, flake-utils, nixpkgs, ... }:
    let
      pkgDrvDir = ./packages;
      pkgDrvs = pkgs: pkgs.lib.attrsets.mapAttrs'
        (pkgDrv: _: rec {
          name = builtins.substring 0
            (
              builtins.sub (builtins.stringLength pkgDrv) 4
            )
            pkgDrv;
          value = import (pkgDrvDir + "/${pkgDrv}") { inherit inputs name pkgs; };
        })
        (builtins.readDir pkgDrvDir);
    in
    {
      overlay = _: prev: pkgDrvs prev;
    } // flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        packages = pkgDrvs pkgs;
      });
}