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";
      };
    };
    sddm = {
      backgroundImage = lib.mkOption {
        default = "${pkgs.sddm-sugar-dark}/usr/share/sddm/themes/sugar-dark/Background.jpg";
        description = "The background image to use with sddm-sugar-dark";
      };
      screenWidth = lib.mkOption {
        default = 1920;
        description = "Width of the screen";
      };
      screenHeight = lib.mkOption {
        default = 1080;
        description = "Width of the screen";
      };
    };
  };

  config = lib.mkIf cfg.enable {
    security.pam.services = {
      login.enableKwallet = true;
      greetd.enableKwallet = true;
    };
    services.xserver = {
      displayManager.sddm = let
        sddm-sugar-dark-configured = pkgs.sddm-sugar-dark.override {
          config = {
            General = {
              Background = "${cfg.sddm.backgroundImage}";
              ScaleImageCropped = true;
              ScreenWidth = builtins.toString cfg.sddm.screenWidth;
              ScreenHeight = builtins.toString cfg.sddm.screenHeight;

              MainColor = "navajowhite";
              AccentColor = "white";
              RoundCorners = 20;
              ScreenPadding = 0;
              Font = "Noto Sans";
              FontSize = "";

              Locale = "";
              HourFormat = "HH:mm";
              DataFormat = "dddd, d of MMMM";

              ForceLastUser = true;
              ForcePasswordFocus = true;
              ForceHideCompletePassword = true;
              ForceHideVirtualKeyboardButton = false;

              HeaderText = "Welcome!";
            };
          };
        };
      in {
        enable = true;
        autoNumlock = true;

        theme = "${sddm-sugar-dark-configured}/usr/share/sddm/themes/sugar-dark";
      };
      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 = lib.mkIf cfg.mobile.enable {
          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; [
          index-fm
          rsibreak
          kalendar
          kate
          okular

          # Some Gnome software
          gnome.totem
        ];
      in kdePackages ++ packages;
      sessionVariables = let
        askPass = "${pkgs.libsForQt5.ksshaskpass}/bin/ksshaskpass";
      in {
        SSH_ASKPASS = askPass;
        SSH_ASKPASS_REQUIRE = "prefer";
        GIT_ASKPASS = askPass;
      };
    };
  };
}