code: def cli(ctx, packages, all, list, force, platform):
      
  
      if packages:
          for package in packages:
              Installer(package, platform, force).install()
      elif all:  # pragma: no cover
          packages = Resources(platform).packages
          for package in packages:
              Installer(package, platform, force).install()
      elif list:
          Resources(platform).list_packages(installed=True, notinstalled=True)
      else:
          click.secho(ctx.get_help())
docs: Install packages.