dream2nix/flake.nix

{
  description = "dream2nix: A generic framework for 2nix tools";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    npmlock2nix = { url = "github:nix-community/npmlock2nix"; flake = false; };
  };

  outputs = { self, nixpkgs, npmlock2nix }:
    let

      lib = nixpkgs.lib;

      supportedSystems = [ "x86_64-linux" ];

      forAllSystems = f: lib.genAttrs supportedSystems (system: f system);

      nixpkgsFor = forAllSystems (system: import nixpkgs {
        inherit system;
        overlays = [ self.overlay ];
      });

      dream2nixFor = forAllSystems (system: import ./src rec {
        pkgs = nixpkgsFor."${system}";
        inherit lib;
        externalSources = pkgs.runCommand "dream2nix-imported" {} ''
          mkdir -p $out/npmlock2nix
          cp ${npmlock2nix}/{internal.nix,LICENSE} $out/npmlock2nix/
        '';
      });

    in
      {
        overlay = curr: prev: {};

        lib.dream2nix = dream2nixFor;

        defaultApp = forAllSystems (system: self.apps."${system}".cli);

        apps = forAllSystems (system: {
          cli = {
            "type" = "app";
            "program" = builtins.toString (dream2nixFor."${system}".apps.cli);
          };
          install = {
            "type" = "app";
            "program" = builtins.toString (dream2nixFor."${system}".apps.install);
          };
        });

        devShell = forAllSystems (system: nixpkgsFor."${system}".mkShell {
          buildInputs = with nixpkgsFor."${system}"; [
            nixUnstable
          ];
          shellHook = ''
            export NIX_PATH=nixpkgs=${nixpkgs}
          '';
        });
      };
}