LunarML setup with flake.nix

lunarml-flake.nix

{
  description = "A basic flake with a shell";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      nixpkgs,
      flake-utils,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
	lunarmlBin = pkgs.writeShellScriptBin "lunarml" ''
	  exec "${pkgs.lunarml}/bin/lunarml" -B "${pkgs.lunarml}/lib/lunarml" "$@"
	'';
      in
      {
        devShells.default =
          pkgs.mkShell {
	    packages = [
	      lunarmlBin
	    ];
	    env = {
	      SML_LIB = "${pkgs.lunarml}/lib/lunarml/ml";
	    };
          };
      }
    );
}