From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#36594: No hint for missing argument
Date: Thu, 11 Jul 2019 22:40:58 +0200
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References: <C500F9C2-AEBB-4FE7-A826-A4A75E280031@lepiller.eu>
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In-Reply-To: <C500F9C2-AEBB-4FE7-A826-A4A75E280031@lepiller.eu> (Julien
 Lepiller's message of "Thu, 11 Jul 2019 11:49:45 +0200")
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To: Julien Lepiller <julien@lepiller.eu>
Cc: 36594@debbugs.gnu.org

Julien Lepiller <julien@lepiller.eu> skribis:

> When you type an option that requires an argument, but don't provide one,=
 you get an error message that says there is a missing argument. There shou=
ld brobably be a hint on what values are acceptable. For instance, there is=
 no way to know from "guix package -v" or "guix package --help" what values=
 are accepted. In other cases, there is a --list-something option.
>
> Maybe -v is the only case where it would be useful to do something, becau=
se you could guess its existence and not use a verbosity level. Maybe fixin=
g the help message to say --verbosity=3D[0-5] is enough?

Currently it says:

--8<---------------cut here---------------start------------->8---
$ guix build --help | grep -e -verbo
  -v, --verbosity=3DLEVEL  use the given verbosity LEVEL
--8<---------------cut here---------------end--------------->8---

We could add =E2=80=9Can integer between 0 and 2=E2=80=9D, but this was left
non-explicit in case we eventually extend it to -7 to +42.

Maybe there=E2=80=99s a limit on what we can do to help users?  :-)

Ludo=E2=80=99.