From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hartmut Goebel <h.goebel@crazy-compilers.com>
Subject: bug#27820: guix package -u: order of argument is significant
Date: Wed, 26 Jul 2017 10:28:01 +0200
Message-ID: <59785291.80904@crazy-compilers.com>
References: <5977294D.1020304@crazy-compilers.com> <87fudkb8zm.fsf@netris.org>
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To: Mark H Weaver <mhw@netris.org>
Cc: 27820@debbugs.gnu.org

Am 25.07.2017 um 21:40 schrieb Mark H Weaver:
> That's because "--fallback" was treated as the argument to -u, i.e. the=

> regexp specifying which packages to upgrade.  The few compiled packages=

> were needed to run the profile hooks.

I'm astound about this. Python's argparse library is handling this as
the user expects:

import argparse
parser =3D argparse.ArgumentParser()
parser.add_argument('-u', '--update', nargs=3D'?', const=3D42)
parser.add_argument('--fallback', action=3D"store_true")

print(parser.parse_args(['-u', '--fallback']))

print(parser.parse_args(['-u', 'xxx', '--fallback']))

prints

Namespace(fallback=3DTrue, update=3DNone)
Namespace(fallback=3DTrue, update=3D'xxx')

See https://docs.python.org/3/library/argparse.html#nargs

Isn't there a elaborated scheme/guile argparse library we can you? This
would/shouls/could also solve the issue that in guix we can not shortcut
options.

--=20
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |