feat: myvnc as nix module

cluster/myvnc.nix

@@ -0,0 +1,44 @@
+{ pkgs, lib, config, ... }:
+with lib;
+let
+  cfg = config.features.myvnc;
+
+  myvnc = pkgs.writeScriptBin "myvnc" ''
+    #!${pkgs.runtimeShell}
+
+    uid=`id -u`
+    port=$((9000+$uid))
+    shell=`getent passwd $(id -un) | awk -F : '{print $NF}'`
+    vnc=${pkgs.turbovnc}/bin/vncserver
+    # vnc=/nix/store/czp2b60dwk75widi8y287hr0xx1wgv2a-tigervnc-1.10.1/bin/vncserver
+
+    case $1 in
+    -p|--port) shift; port=$1 ;;
+    kill|stop)
+        display=$($vnc -list | sed  -n 's/^\(:[0-9]\+\).*/\1/p'| head -1)
+        $vnc -kill $display
+        exit 0
+        ;;
+    esac
+    ps ax | sed '/grep/d' | grep "Xvnc.*-rfbport $port" >/dev/null 2>&1
+    [ $? = 1 ] && $vnc -rfbport $port
+    echo "Xvnc server is running on port $port."
+    # exec $shell -i
+  '';
+
+  configuration = {
+      services.xserver.windowManager.fluxbox.enable = true;
+      environment.systemPackages = with pkgs; [
+          alacritty
+          myvnc
+      ];
+  };
+in {
+  options.features.myvnc = {
+    enable = mkEnableOption "Enable mynvc script";
+  };
+
+  config = mkMerge [
+    (mkIf config.features.myvnc.enable configuration)
+  ];
+}