eon/flake.nix at main · RyanGibb/eon · GitHub

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{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs";
    opam-nix.url = "github:tweag/opam-nix";
    flake-utils.url = "github:numtide/flake-utils";
    # we pin opam-nix's nixpkgs to follow the flakes, avoiding using two different instances
    opam-nix.inputs.nixpkgs.follows = "nixpkgs";

    # maintain a different opam-repository to those pinned upstream
    # opam-repository = {
    #   url = "github:ocaml/opam-repository";
    #   flake = false;
    # };
    # opam-nix.inputs.opam-repository.follows = "opam-repository";

    # deduplicate flakes
    opam-nix.inputs.flake-utils.follows = "flake-utils";
  };
  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
      opam-nix,
      ...
    }@inputs:
    # create outputs for each default system
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        package = "eon";
        pkgs = nixpkgs.legacyPackages.${system};
        opam-nix-lib = opam-nix.lib.${system};
        devPackagesQuery = {
          ocaml-lsp-server = "*";
          ocamlformat = "*";
          utop = "*";
        };
        query = {
          ocaml-base-compiler = "*";
        };
        scope =
          # recursive finds vendored dependancies in duniverse
          opam-nix-lib.buildOpamProject' { recursive = true; } ./. (query // devPackagesQuery);
      in
      {
        packages.default = scope.${package};
        defaultPackage = scope.${package};

        devShells.default =
          let
            devPackages = builtins.attrValues (pkgs.lib.getAttrs (builtins.attrNames devPackagesQuery) scope);
          in
          pkgs.mkShell {
            inputsFrom = [ scope.${package} ];
            buildInputs = devPackages;
          };
      }
    )
    // {
      nixosModules = {
        default.imports = [ (import ./module.nix self.packages) ];
        acme.imports = [ (import ./acme.nix self.packages) ];
      };

      formatter = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
        system: nixpkgs.legacyPackages.${system}.nixfmt
      );
    };
}