{ config, pkgs, ... }:
let
  # https://nixos.wiki/wiki/Zsh
  zsh-config = {
    enable = true;
    autosuggestion.enable = true;
    syntaxHighlighting.enable = true;
    shellAliases = {
      #ll = "ls -l";
      #update = "sudo nixos-rebuild switch";
    };

    # Keep a detailed history to analyse it later:
    # https://github.com/bamos/zsh-history-analysis/blob/master/README.md
    #
    # View tail of history:
    #   history -i -10
    #
    # Keep a long history (for later analysis).
    history.size = 100000;
    # Record datetime time of commands (for later analysis).
    # Instead of just `ls`, this will store e.g. `: 1736166069:0;ls`.
    history.extended = true;
    # Do not record an event that was just recorded again.
    history.ignoreDups = false;
    # Delete an old recorded event if a new event is a duplicate.
    history.ignoreAllDups = false;
    # Do not record if first char is space.
    history.ignoreSpace = true;
    # Share between sessions.
    history.share = true;
    # Don't record commands if they match the ignore pattern.
    history.ignorePatterns = [ "history *" ];

    oh-my-zsh = {
      enable = true;
      plugins = [
        # Provides many aliases and a few useful functions.
        #"git"
        # Easily prefix your current or previous commands with sudo by pressing `esc` twice.
        #"sudo"
      ];
      #theme = "robbyrussell";
      theme = "agnoster";
    };
  };
in
{
  # https://nixos.wiki/wiki/Command_Shell
  # When adding a new shell, always enable the shell system-wide, even if it's already enabled in your Home Manager configuration, otherwise it won't source the necessary files.
  programs.zsh.enable = true;
  users.defaultUserShell = pkgs.zsh;

  # Inside the following Home Manager configuration block,
  # `config` refers to Home Manager configuration.
  home-manager.users.yoda = { osConfig, config, pkgs, ... }: {
    programs.zsh = zsh-config // {
      # nix-repl: config.home-manager.users.yoda.programs.zsh.history.path
      # -> ~/.local/share/.histfile
      history.path = "${config.xdg.dataHome}/.histfile";
    };
  };
  home-manager.users.root = { osConfig, config, pkgs, ... }: {
    programs.zsh = zsh-config // {
      history.path = "${config.xdg.dataHome}/.histfile";
    };
  };
}