nixos-config/modules/desktop/plasma.nix

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

let
  cfg = config.ptw.programs.plasma;
in {
  options.ptw.programs.plasma = {
    enable = lib.mkEnableOption "Enable KDE Plasma";
    mobile = {
      enable = lib.mkEnableOption "Enable Plasma Mobile";
    };
    wayland = {
      enable = lib.mkOption {
        default = true;
        description = "Ignore NixOS 'recommendations' and use the Wayland session by default";
      };
    };
  };

  config = lib.mkIf cfg.enable {
    security.pam.services = {
      login.enableKwallet = true;
      greetd.enableKwallet = true;
    };
    services.xserver = {
      displayManager.sddm = {
        enable = true;
        autoNumlock = true;
      };
      desktopManager.plasma5 = {
        enable = true;
        runUsingSystemd = true;
        supportDDC = true;
        mobile.enable = cfg.mobile.enable;

        kdeglobals = lib.mkIf cfg.mobile.enable {
          KDE = {
            StartDragDist = "10";
            LookAndFeelPackage = "org.kde.plasma.phone";
          };

          Icons = {
            Theme = "breeze";
          };

          General = {
            ColorScheme = "breeze";
            Name = "breeze";
            XftHintStyle = "none";
            XftSubPixel = "none";
            shadeSortColumn = "true";
          };
        };

        kwinrc = {
          Plugins = {
            "org.kde.phone.multitaskingEnabled" = "false";
            "kwin4_effect_eyeonscreenEnabled" = "false";
            "kwin4_effect_windowapertureEnabled" = "false";
            blurEnabled = "false";
            contrastEnabled = "false";
          };

          Windows = {
            Placement = "Maximizing";
          };

          TabBox = {
            TouchBorderActive = "9";
            TouchBorderAlternativeActive = "9";
            BorderActivate = "9";
          };

          "Effect-PresentWindows" = {
            BorderActivateAll = "9";
          };

          "org.kde.kdecoration2" = {
            NoPlugin = "true";
          };

          TouchEdges = {
            Left = "None";
            Right = "None";
          };

          Wayland = {
            InputMethod = "${pkgs.maliit-keyboard}/usr/share/applications/com.github.maliit.keyboard.desktop";
          };
        };
      };

      # See https://github.com/NixOS/nixpkgs/commit/a506f9c79700255c215dddb53455d5e2bed6c1af
      displayManager = {
        defaultSession = lib.mkIf cfg.wayland.enable "plasmawayland";
        #sessionPackages = lib.mkIf cfg.mobile.enable [ pkgs.libsForQt5.plasma5.plasma-mobile ];
      };
    };

    xdg.portal = {
      enable = true;
      extraPortals = [ pkgs.xdg-desktop-portal-kde ];
    };
    
    environment.systemPackages = let
      plasmaMobilePackages = with pkgs.libsForQt5; with plasma5; with kdeApplications; with kdeFrameworks; [
        plasma-mobile
        plasma-nano
        pkgs.maliit-framework
        pkgs.maliit-keyboard
      ];
      kdePackages = with pkgs.libsForQt5; [
        okular
        kdeconnect-kde
        breeze-gtk
        bismuth
        gwenview
        yakuake
      ] ++ lib.optionals cfg.mobile.enable plasmaMobilePackages;
      packages = with pkgs; [
        #kde-rounded-corners
        index-fm
        rsibreak
        kalendar
        kate
        okular

        # Some Gnome software
        gnome.totem
      ];
    in kdePackages ++ packages;
  };
}