_:{
  config,
  lib,
  options,
  pkgs,
  ...
}:
with lib; let
  cfg = config.services.sxhkd;
  keybindingsStr = concatStringsSep "\n" (mapAttrsToList (hotkey: command:
    optionalString (command != null) ''
      ${hotkey}
        ${command}
    '')
  cfg.keybindings);
  configFile = pkgs.writeText "sxhkdrc" (concatStringsSep "\n" [keybindingsStr cfg.extraConfig]);
in {
  options.services.sxhkd = {
    enable = mkEnableOption "simple X hotkey daemon";

    package = mkOption {
      type = types.package;
      default = pkgs.sxhkd;
      defaultText = "pkgs.sxhkd";
      description = "Package containing the <command>sxhkd</command> executable.";
    };
    extraOptions = mkOption {
      type = types.listOf types.str;
      default = [];
      description = "Command line arguments to invoke <command>sxhkd</command> with.";
      example = literalExpression ''[ "-m 1" ]'';
    };

    keybindings = mkOption {
      type = types.attrsOf (types.nullOr types.str);
      default = {};
      description = "An attribute set that assigns hotkeys to commands.";
      example = literalExpression ''
        {
          "super + shift + {r,c}" = "i3-msg {restart,reload}";
          "super + {s,w}"         = "i3-msg {stacking,tabbed}";
        }
      '';
    };

    extraConfig = mkOption {
      default = "";
      type = types.lines;
      description = "Additional configuration to add.";
      example = literalExpression ''
          super + {_,shift +} {1-9,0}
        i3-msg {workspace,move container to workspace} {1-10}
      '';
    };
  };
  config = mkIf cfg.enable {
    environment.systemPackages = [cfg.package];
    systemd.user.services.sxhkd = {
      description = "sxhkd hotkey daemon";
      wantedBy = ["graphical-session.target"];
      partOf = ["graphical-session.target"];
      serviceConfig = {
        ExecStart = "${cfg.package}/bin/sxhkd -c ${configFile} ${toString cfg.extraOptions}";
        RestartSec = 3;
        Restart = "always";
      };
    };
  };
}