{
  config,
  lib,
  pkgs,
  ...
}:
# Rust tools for the primary user's shell environment.
let
  cfg = config.modules.shell.rust;
  user = config.user.name;
  toolchain = pkgs.symlinkJoin {
    name = "rust-toolchain";
    paths = with pkgs; [
      cargo
      clippy
      gcc
      rustc
      rustfmt
    ];
  };
in
{
  options.modules.shell.rust.enable = lib.mkEnableOption "Rust tools for the primary user's shell environment";

  config = lib.mkIf cfg.enable {
    registry.env-var.${config.networking.hostName}.RUST_TOOLCHAIN_ROOT = "${toolchain}";

    home-manager.users.${user} = {
      home.packages = [
        toolchain
        pkgs.rust-analyzer
      ];
    };
  };
}