def setup_app(main_func, min_params=0, help_txt=""):
global argc, argv, app
required_args = min_params + 1
if argc >= 2 and argv[1] in ["-h", "--help"]:
show_usage(help_txt)
exit()
if argc >= required_args:
args = argv[1:required_args] if required_args != 1 else argv[1:]
main_func(*args)
else:
show_usage(help_txt)
cerr("Error: need at least %d arguments" % min_params)
exit()
def show_usage(help_txt):
global argc, argv, app
cerr(("Usage: %s " + help_txt) % app)
