{ config, pkgs, lib, optionalString, ... }:

let
  inherit (pkgs.lib) optionalString;

  # not having the attribute users means
  # we cannot change the default shell (e.g. this is not a NixOS host)
  exec_zsh = ''
    if [ -f "$HOME/.bashrc" ]; then
      . "$HOME/.bashrc"
    fi

    exec ${pkgs.zsh}/bin/zsh
  '';

  nix_run_fn = ''
    function _nr {
      if [ "$#" -lt 1 ]; then
        echo "Usage: _nr <pkg>"
        return
      fi

      quoted_args=()
      local pkg=$1
      shift 1
      
      for a in "$@"; do
        quoted_args+=("\"$a\"")
      done

      echo ''${quoted_args[@]}

#      `nix run nixpkgs#$pkg -- ''${quoted_args[@]}`
      exec nix run nixpkgs#$pkg "$@"
    }
  '';
in
{
  programs.zsh = {
    enable = true;

    oh-my-zsh = {
      enable = true;
      plugins = [ "git" "sudo" "docker" "docker-compose" "adb" "systemd" ];
      theme = "bira";
    };
  };

  home.file.".bashrc".text = ''
    ${nix_run_fn}
        
    ${optionalString (!builtins.hasAttr "users" config) "${exec_zsh}"}
  '';

  home.file.".zshrc".text = nix_run_fn;
}