flake.nix

{
  inputs = {
    nixpkgs.url      = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
    flake-utils.url  = "github:numtide/flake-utils";
  };
  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        overlays = [ (import rust-overlay) ];
        pkgs = import nixpkgs {
          inherit system overlays;
        };

        rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
      in
      {

        devShells.default = pkgs.mkShell {
          nativeBuildInputs = with pkgs; [
            openssl
            pkg-config
            protobuf
          ];

          buildInputs = with pkgs; [
            rustToolchain
            clang
            rocksdb
          ] ++ lib.optionals stdenv.isDarwin [
            darwin.apple_sdk.frameworks.Security
          ];

          LIBCLANG_PATH = "${pkgs.llvmPackages.libclang.lib}/lib";
          PROTOC = "${pkgs.protobuf}/bin/protoc";
          ROCKSDB_LIB_DIR = "${pkgs.rocksdb}/lib";
        };
      }
    );
}