{ config, pkgs, ... }:

with pkgs.lib;

let

  cfg = config.services.gpm;

in

{

  ###### interface

  options = {

    services.gpm = {

      enable = mkOption {
        type = types.bool;
        default = false;
        description = ''
          Whether to enable GPM, the General Purpose Mouse daemon,
          which enables mouse support in virtual consoles.
        '';
      };

      protocol = mkOption {
        type = types.str;
        default = "ps/2";
        description = "Mouse protocol to use.";
      };

    };

  };


  ###### implementation

  config = mkIf cfg.enable {

    jobs.gpm =
      { description = "General purpose mouse";

        startOn = "started udev";

        exec = "${pkgs.gpm}/sbin/gpm -m /dev/input/mice -t ${cfg.protocol} -D &>/dev/null";
      };

  };

}