Setup Zsh + Oh-my-zsh + PowerLevel10K - NixOS (without Home-manager)

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I’ve finally found a way (probably not the best, but enough for now I guess)!

Here’s the corresponding NixOS configuration :

{ pkgs, ... }:
{
  environment.systemPackages = with pkgs; [
    zsh-powerlevel10k
    meslo-lgs-nf
  ];

  environment.etc."powerlevel10k/p10k.zsh".source = ./p10k.zsh;

  environment.shellAliases = {
    nshell = "nix-shell --run $SHELL"
  };

  programs.zsh = {
    enable = true;
    enableCompletion = true;
    enableBashCompletion = true;
    autosuggestions.enable = true;
    syntaxHighlighting.enable = true;
    histSize = 10000;
    promptInit = ''
      # this act as your ~/.zshrc but for all users (/etc/zshrc)
      source ${pkgs.zsh-powerlevel10k}/share/zsh-powerlevel10k/powerlevel10k.zsh-theme
      source /etc/powerlevel10k/p10k.zsh

      # Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
      # Initialization code that may require console input (password prompts, [y/n]
      # confirmations, etc.) must go above this block; everything else may go below.
      # double single quotes ('') to escape the dollar char
      if [[ -r "''${XDG_CACHE_HOME:-''$HOME/.cache}/p10k-instant-prompt-''${(%):-%n}.zsh" ]]; then
        source "''${XDG_CACHE_HOME:-''$HOME/.cache}/p10k-instant-prompt-''${(%):-%n}.zsh"
      fi

      # uncomment if you want to customize your LS_COLORS
      # https://manpages.ubuntu.com/manpages/plucky/en/man5/dir_colors.5.html
      #LS_COLORS='...'
      #export LS_COLORS
    '';
  };

  users.defaultUserShell = pkgs.zsh;
  system.userActivationScripts.zshrc = "touch .zshrc"; # to avoid being prompted to generate the config for first time
  environment.shells = pkgs.zsh; # https://wiki.nixos.org/wiki/Zsh#GDM_does_not_show_user_when_zsh_is_the_default_shell
  environment.loginShellInit = ''
    # equivalent to .profile
    # https://search.nixos.org/options?show=environment.loginShellInit
  '';
};

:warning: Don’t forget to provide your custom p10k.zsh file (here, at the same level of the current file, place it wherever you want as long as the .source + programs.zsh.promptInit source point to it) :bulb:

Just wanted to share it here, in case someone else wants to achieve the same thing. If ever think there’s some improvements to be done in the above config, please let me know as I’m eager to learn :v:

Cheers!