{
  pkgs,
  lib,
  config,
  self,
  ...
}:
let
  inherit (lib.options) types mkEnable mkOption;
  cfg = config.smooooth;
in
{
  options.programs.smooooth = {
    enable = mkEnable "the smooooth nixos hot reloader";
    blockers = mkOption {
      description = "Names of processes that may block reloading when holding a flake (sub)path open.";
      default = [
        "nano"
        "nvim"
        "vim"
        "vi"
        "hx"
      ];
      example = ''
        [ "hx" ]
      '';
      type = types.listOf types.str;
    };
    path = mkOption {
      description = "Path to the root of your flake.";
      type = types.str;
    };
    pollingRate = mkOption {
      description = "How frequently to poll for blockers when waiting on a reload.";
      default = 10;
      type = types.int;
    };
    preferredNix = mkOption {
      description = "Your preferred package that provides a nix-compatible executable.";
      default = pkgs.nix;
      type = types.package;
    };
  };

  config = lib.mkIf cfg.enable {
    systemd.user = {
      services.smooooth = {
        path = [ (self.packages.${pkgs.system}.smooooth cfg.preferredNix) ];
        serviceConfig = {
          Type = "oneshot";
          ExecStart =
            let
              blockers = builtins.concatStringsSep "|" cfg.blockers;
            in
            "smooooth ${cfg.path} ${blockers} ${toString cfg.pollingRate}";
        };
      };
      paths.smooooth = {
        pathConfig = {
          PathChanged = cfg.path;
          Unit = "smoooth.service";
          TriggerLimitIntervalSec = cfg.pollingRate * 2;
        };
      };
    };
  };
}