{
  config,
  inputs,
  lib,
  pkgs,
  ...
}:
{
  options.my.shell.exercism = {
    enable = lib.mkEnableOption "Exercism coding practice platform";
    users = lib.mkOption {
      type = lib.types.either lib.types.str (lib.types.listOf lib.types.str);
      default = config.my.toggleUsers.shell;
      merge = inputs.self.lib.mergeUsersOption lib;
      description = "Users to install Exercism for";
    };
  };
  config = lib.mkIf config.my.shell.exercism.enable {
    users.users =
      let
        packages = builtins.attrValues {
          inherit (pkgs)
            exercism # learn to code
            bats # testing system, required by Exercism
            ;
        };
      in
      inputs.self.lib.mkUserPackages lib config.my.shell.exercism.users packages;
  };
}