nixos/xppen: init

Co-authored-by: yakrobat <yakrobat@protonmail.com>

nixos/doc/manual/release-notes/rl-2511.section.md

@@ -31,6 +31,8 @@
 
 - [Homebridge](https://github.com/homebridge/homebridge), a lightweight Node.js server you can run on your home network that emulates the iOS HomeKit API. Available as [services.homebridge](#opt-services.homebridge.enable).
 
+- [XPPen](https://www.xp-pen.com/), the official closed-source driver for XP Pen tablets. Available as [programs.xppen](#opt-programs.xppen.enable).
+
 - [LACT](https://github.com/ilya-zlobintsev/LACT), a GPU monitoring and configuration tool, can now be enabled through [services.lact.enable](#opt-services.lact.enable).
   Note that for LACT to work properly on AMD GPU systems, you need to enable [hardware.amdgpu.overdrive.enable](#opt-hardware.amdgpu.overdrive.enable).
 

nixos/modules/module-list.nix

@@ -357,6 +357,7 @@
   ./programs/xfconf.nix
   ./programs/xfs_quota.nix
   ./programs/xonsh.nix
+  ./programs/xppen.nix
   ./programs/xss-lock.nix
   ./programs/xwayland.nix
   ./programs/yazi.nix

nixos/modules/programs/xppen.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.programs.xppen;
+in
+
+{
+  options.programs.xppen = {
+    enable = lib.mkEnableOption "XPPen PenTablet application";
+    package = lib.mkPackageOption pkgs "xppen_4" {
+      example = "pkgs.xppen_3";
+      extraDescription = ''
+        Use xppen_4 for newer and xppen_3 for older tablets.
+        To check which version of the driver you need, go to
+        https://www.xp-pen.com/download/ then select your tablet
+        and look for the major version in the available files for Linux.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    hardware.uinput.enable = true;
+
+    environment.systemPackages = [ cfg.package ];
+
+    services.udev.packages = [ cfg.package ];
+
+    systemd.tmpfiles.rules = [
+      "d /var/lib/pentablet/conf/xppen 0777 - - -"
+    ];
+
+    systemd.services.xppen-create-config-dir = {
+      restartTriggers = [ cfg.package ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        Type = "oneshot";
+        TimeoutSec = 60;
+        ExecStart = pkgs.writeShellScript "xppen-create-config-dir" ''
+          readarray -d "" files < <(find ${cfg.package}/usr/lib/pentablet/conf -type f -print0)
+          for file in "''${files[@]}"; do
+            file_new="/var''${file#${cfg.package + "/usr"}}"
+            if [ ! -f $file_new ]; then
+              install -m 666 "''$file" "''$file_new"
+            fi
+          done
+        '';
+      };
+    };
+  };
+}