meat/flake.nix

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

    flake-utils.url = "github:numtide/flake-utils";

    nh.url = "github:viperML/nh";

    lix = {
      url = "https://git.lix.systems/lix-project/lix/archive/main.tar.gz";
      flake = false;
    };

    lix-module = {
      url = "https://git.lix.systems/lix-project/nixos-module/archive/main.tar.gz";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.lix.follows = "lix";
    };
  };

  outputs = inputs @ {
    self,
    nixpkgs,
    flake-utils,
    ...
  }: let
    inherit (inputs) nixpkgs;
    lix-overlay = inputs.lix-module.overlays.default;
    lix-module = inputs.lix-module.nixosModules.default;
    nh-overlay = inputs.nh.overlays.default;
    version = builtins.toString self.lastModified;
  in
    flake-utils.lib.eachDefaultSystem (
      system: let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [
            lix-overlay
            nh-overlay
          ];
          modules = [lix-module];
          extra-substituters = "https://anmonteiro.nix-cache.workers.dev";
          extra-trusted-public-keys = "ocaml.nix-cache.com-1:/xI2h2+56rwFfKyyFVbkJSeGqSIYMC/Je+7XXqGKDIY=";
        };
        minimal = let
          inherit
            (pkgs.ocamlPackages)
            dune_3
            ocaml
            ;
        in [
          dune_3
          ocaml
        ];
        dev = let
          inherit
            (pkgs.ocamlPackages)
            utop
            ocaml-lsp
            ocamlformat
            ocamlformat-rpc-lib
            ;
        in [
          utop
          ocaml-lsp
          ocamlformat
          ocamlformat-rpc-lib
        ];
        inherit (pkgs) lix nh;
      in {
        devShells.default = let
          inherit (pkgs) mkShell;
        in
          mkShell {
            buildInputs = minimal ++ dev ++ [lix nh];
          };

        packages.default = pkgs.callPackage ./nix/default.nix {
          ocaml-deps = minimal;
          inherit version;
        };

        defaultPackage = self.packages.${system}.default;
      }
    )
    // {
      nixosModules.meat = import ./nix/module.nix {
        meatOverlays = [
          self.overlays.meat
          nh-overlay
        ];
        lixModule = lix-module;
      };

      overlays.meat = final: _prev: let
        ocaml-deps = let
          inherit
            (prev.ocamlPackages)
            dune_3
            ocaml
            ;
        in [
          dune_3
          ocaml
        ];
      in {
        meat = final.callPackage ./nix/default.nix {
          inherit ocaml-deps version;
        };
      };
    };
}