rust.nix

{
  description = "Dev Env";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    utils.url = "github:numtide/flake-utils";
    fenix = {
      url = "github:nix-community/fenix";
      # The `follows` keyword in inputs is used for inheritance.
      # Here, `inputs.nixpkgs` of sops-nix is kept consistent with the `inputs.nixpkgs` of
      # the current flake, to avoid problems caused by different versions of nixpkgs.
      inputs = { nixpkgs.follows = "nixpkgs"; };
    };
  };

  outputs = { self, nixpkgs, fenix, utils }:
    utils.lib.eachDefaultSystem (system:
      let
        overlays = [ (fenix.overlays.default) ];
        pkgs = import nixpkgs { inherit system overlays; };
        default = fenix.packages.${system}.default;
        complete = fenix.packages.${system}.complete;
      in with pkgs; {
        devShells.default = mkShell {
          buildInputs = [
            (fenix.packages.${system}.fromToolchainFile {
              dir = ./relaychain;
              sha256 = "sha256-2eFldKtzWbd8S3AU9pgqR/6wRQS4OHPW2bqtznu/X/Q=";
            })
            # (with fenix.packages.${system}; combine [ complete.rust-src ])
            rust-analyzer-nightly
            gcc
            zlib
            libgit2
            protobuf
            # rust-wasm
            pkg-config
            llvmPackages_15.libcxxClang
            zstd
          ];
          shellHook = "  echo \"hello\"\n";
          LIBCLANG_PATH = "${llvmPackages_15.clang-unwrapped.lib}/lib";
        };
      });
}