Nix development flake for Rust (WIP)

rust-flake.nix

{
  description = "Rust development environment";

  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;
        };
      in {
        devShells.default = with pkgs;
          mkShell {
            buildInputs =
              [
                pkg-config
                openssl
              ]
              ++ lib.optionals pkgs.stdenv.isDarwin [
                pkgs.libiconv
                pkgs.darwin.apple_sdk.frameworks.Security
                pkgs.darwin.apple_sdk.frameworks.CoreFoundation
                pkgs.darwin.apple_sdk.frameworks.SystemConfiguration
                pkgs.darwin.apple_sdk.frameworks.Carbon
                pkgs.darwin.apple_sdk.frameworks.WebKit
              ];
            shellHook = ''
              exec zsh
            '';
          };
      }
    );
}