{ config, lib, pkgs, flakeRoot, inputs, ... }:
let
  packagesConfPath = flakeRoot.outPath + "/assets/conf/apps/packages.conf";
  raw = builtins.readFile packagesConfPath;
  # IMPORTANT: explicit "\n" so we never accidentally split into characters
  rawLines = lib.splitString "\n" raw;
  # Guard: if we accidentally split into characters, rawLines length ~= stringLength raw
  _guard = assert !(
  builtins.stringLength raw > 1 &&
  builtins.length rawLines == builtins.stringLength raw
  ); true;
  cleanLine = l:
  let
  noCR = lib.replaceStrings [ "\r" ] [ "" ] l;
  noInlineComment = lib.head (lib.splitString "#" noCR);
  in
  lib.strings.trim noInlineComment;
  entries =
  builtins.filter (l: l != "")
  (map cleanLine rawLines);
  resolvePkg = name:
  let
  parts = lib.splitString "." name;
  found = lib.attrByPath parts null pkgs;
  in
  if found == null then
    throw ''
    install_packages.nix: package not found in pkgs
    Token    : ${builtins.toJSON name}
    packages.conf   : ${toString packagesConfPath}
    Hint     : check the attribute name on search.nixos.org/packages
    ''
  else
    found;
  packages = builtins.seq _guard (map resolvePkg entries);
  zenBrowser =
  inputs.zen-browser.packages.${pkgs.stdenv.hostPlatform.system}.default;
in
{
  environment.systemPackages =
  packages
  ++ [ zenBrowser ];
}