gistfile1.txt

{ config, pkgs, callPackage, ... }: 

{
  ...
  environment.pathsToLink = [ "/libexec" ]; # links /libexec from derivations to /run/current-system/sw 
  ...
  services.xserver = {
    enable = true;

    desktopManager = {
      xterm.enable = false;
    };
   
    displayManager = {
        defaultSession = "none+i3";
    };

    windowManager.i3 = {
      enable = true;
      extraPackages = with pkgs; [
        dmenu #application launcher most people use
        i3status # gives you the default i3 status bar
        i3lock #default i3 screen locker
        i3blocks #if you are planning on using i3blocks over i3status
     ];
    };
  };
  ...
}