flake.nix

{
  description = "melange-fetch Nix Flake";

  inputs.nixpkgs.url = "github:nix-ocaml/nix-overlays";

  outputs = { self, nixpkgs }:
    let
      forAllSystems = f: nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (system:
        let
          pkgs = nixpkgs.legacyPackages.${system}.extend (self: super: {
            ocamlPackages = super.ocaml-ng.ocamlPackages_5_2;
          });
        in
        f pkgs);
    in
    {
      packages = forAllSystems (pkgs: {
        default = with pkgs.ocamlPackages; buildDunePackage {
          pname = "melange-fetch";
          version = "dev";

          src =
            let fs = pkgs.lib.fileset; in
            fs.toSource {
              root = ./.;
              fileset = fs.unions [
                ./dune-project
                ./melange-fetch.opam
                ./src
              ];
            };

          nativeBuildInputs = with pkgs.ocamlPackages; [ melange ];
          propagatedBuildInputs = with pkgs.ocamlPackages; [ melange ];
        };
      });

      devShells = forAllSystems (pkgs:
        let
          inherit (pkgs) nodejs_latest lib stdenv darwin;
          mkShell = { inputsFrom, buildInputs ? [ ] }: pkgs.mkShell {
            nativeBuildInputs = with pkgs; [
              yarn
              nodejs_latest
            ] ++ (with pkgs.ocamlPackages; [
              reason
              ocamlformat
              merlin
            ]);
            inherit inputsFrom buildInputs;
          };
        in
        {
          default = mkShell {
            inputsFrom = [ self.packages.${pkgs.system}.default ];
          };
          release = mkShell {
            inputsFrom = [ self.packages.${pkgs.system}.default ];
            buildInputs = with pkgs; [ cacert curl ocamlPackages.dune-release git ];
          };
        });
    };
}