system/modules/home-manager/configs/window-manager/xmonad/default.nix

{ config, pkgs, lib, ... }:

let
  cfg = config.local.window-manager.xmonad;
  themeCfg = config.local.themes."${config.local.theme.name}";

  projectType = with lib; types.submodule {
    options = {
      name = mkOption {
        type = types.str;
      };
      workdir = mkOption {
        type = types.str;
      };
      windowCount = mkOption {
        type = types.ints.positive;
        default = 1;
      };
      terminalCommands = mkOption {
        type = types.listOf types.str;
        default = [ ];
      };
      spawnPrograms = mkOption {
        type = types.listOf types.str;
        default = [ ];
      };
    };
  };

  mkXmonadProjectSpawnProgram = program:
    "spawn \"${program}\"";

  mkXmonadProjectTerminalCommand = command:
    "spawn $ terminal' workdir $ Just \"${command}\"";


  mkXmonadProject = { name, workdir, windowCount, spawnPrograms, terminalCommands }:
    ''
      Project {
        projectName = "${name}",
        projectStartHook =
          do
            let workdir = "${workdir}"
            ${lib.concatMapStringsSep "\n" mkXmonadProjectSpawnProgram spawnPrograms}
            ${lib.concatMapStringsSep "\n" mkXmonadProjectTerminalCommand terminalCommands}
            replicateM_ ${toString windowCount} $ spawn $ terminal workdir
      }
    '';

  xmonadProjects = lib.concatMapStringsSep "  , " mkXmonadProject cfg.projects;
in
{
  options.local.window-manager.xmonad = with lib; {
    enable = mkEnableOption "xmonad window manager";
    projects = mkOption {
      type = types.listOf projectType;
      default = [ ];
    };
  };

  config = lib.mkIf cfg.enable {
    home.packages = with pkgs; [
      xclip # access x clipboard from a console
      dmenu # menu for x window system
      nitrogen # wallpaper manager
    ];

    xsession = {
      enable = true;

      windowManager.xmonad = {
        enable = true;
        enableContribAndExtras = true;

        haskellPackages = pkgs.unstable.haskellPackages;
        extraPackages = (hp: [
          hp.dbus
          hp.monad-logger
        ]);

        config = pkgs.substituteAll {
          src = ./xmonad_config.hs;
          projects = "\n  " + xmonadProjects;
          inherit (themeCfg.bar) background mainText inactiveText;
          inherit (themeCfg.window) activeBorder inactiveBorder;
          inherit (themeCfg.highlights) critical warning success;
          inherit (themeCfg.syntax) mark1 mark2 mark3;
          kdbBrightnessScriptPath = "${../scripts/kdb_brightness.sh}";
        };
      };

      initExtra = ''
        ${pkgs.nitrogen}/bin/nitrogen --restore &
      '';
    };
  };
}