docs: def usage(repo):
      """Usage: slpkg [COMMANDS|OPTIONS] {repository|package...}
  
               Commands:
               [update, --only=[...]]
               [upgrade, --only=[...]]
               [repo-add [repository name] [URL]]
               [repo-remove [repository]]
               [repo-enable]
               [repo-list]
               [repo-info [repository]]
               [update [slpkg]]
               [health, --silent]
               [deps-status, --tree, --graph=[type]]
               [new-config]
  
               Optional arguments:
               [-h] [-v]
               [-a [script] [sources...]]
               [-b [package...] --add, --remove,
                   [list]]
               [-q [package...] --add, --remove,
                   [list, build, install, build-install]]
               [-g [print, edit, reset]]
               [-l [repository], --index, --installed, --name]
               [-c [repository], --upgrade, --rebuild, --skip=[...],
                                 --resolve-off, --checklist]
               [-s [repository] [package...], --rebuild, --reinstall,
                                              --resolve-off, --download-only,
                                              --directory-prefix=[dir],
                                              --case-ins, --patches]
               [-t [repository] [package], --check-deps, --graph=[type],
                                           --case-ins]
               [-p [repository] [package], --color=[]]
               [-n [SBo package], --checklist, --case-ins]
               [-F [package...], --case-ins]
               [-f [package...], --case-ins]
               [-i [options] [package...]]
               [-u [options] [package...]]
               [-r [options] [package...], --deps, --check-deps, --tag,
                                           --checklist]
               [-d [package...]]
               """
      if repo and repo not in _meta_.repositories:
          error_repo = ""
          all_repos = RepoList().all_repos.keys()
          del RepoList().all_repos
          if repo in all_repos:
              error_repo = ("slpkg: Error: Repository '{0}' is not activated"
                            "\n".format(repo))
          else:
              error_repo = ("slpkg: Error: Repository '{0}' does not exist"
                            "\n".format(repo))
          print("\n" + error_repo)
          raise SystemExit(1)
      print(usage.__doc__)
      print("For more information try 'slpkg -h, --help' or view manpage\n")