flake.nix

{
  inputs = {
    nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-23.11";

    systems.url = "github:nix-systems/default";
    devenv = {
      url = "github:cachix/devenv";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  nixConfig = {
    extra-substituters = [
      "https://devenv.cachix.org"
    ];
    extra-trusted-public-keys = [
      "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw="
    ];
  };

  outputs = { self, nixpkgs, nixpkgs-stable, devenv, systems, ... } @ inputs:
    let
      forEachSystem = nixpkgs.lib.genAttrs (import systems);
    in
    {
      overlay = final: prev: {
        stable = import inputs.nixpkgs-stable {
          system = final.system;
          config.allowUnfree = true;
        };
      };
    } // {
      packages = forEachSystem (system: {
        devenv-up = self.devShells.${system}.default.config.procfileScript;
      });

      devShells = forEachSystem
        (system:
          let
            # pkgs = nixpkgs.legacyPackages.${system};
            pkgs = import nixpkgs {
              inherit system;

              overlays = [
                self.overlay
              ];
            };
          in
          {
            default = devenv.lib.mkShell {
              inherit inputs pkgs;
              modules = [
                ./devenv.nix
              ];
            };
          });
    };
}