nixpkgs/pkgs/by-name/co/comic-mandown/package.nix

{
  lib,
  python3Packages,

  withGUI ? true,
}:
let
  mandown' = python3Packages.mandown.overridePythonAttrs (prev: {
    dependencies = prev.dependencies ++ lib.optionals withGUI prev.optional-dependencies.gui;
  });
  mandownApp = python3Packages.toPythonApplication mandown';
in
mandownApp
// {
  meta = mandownApp.meta // {
    mainProgram = "mandown";
  };
}