From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Lepiller <julien@lepiller.eu>
Subject: bug#36594: No hint for missing argument
Date: Thu, 11 Jul 2019 23:45:19 +0200
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 36594@debbugs.gnu.org

Le Thu, 11 Jul 2019 22:40:58 +0200,
Ludovic Court=C3=A8s <ludo@gnu.org> a =C3=A9crit :

> Julien Lepiller <julien@lepiller.eu> skribis:
>=20
> > 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 should 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,
> > because you could guess its existence and not use a verbosity
> > level. Maybe fixing the help message to say --verbosity=3D[0-5] is
> > enough? =20
>=20
> Currently it says:
>=20
> --8<---------------cut here---------------start------------->8---
> $ guix build --help | grep -e -verbo
>   -v, --verbosity=3DLEVEL  use the given verbosity LEVEL
> --8<---------------cut here---------------end--------------->8---
>=20
> We could add =E2=80=9Can integer between 0 and 2=E2=80=9D, but this was l=
eft
> non-explicit in case we eventually extend it to -7 to +42.
>=20
> Maybe there=E2=80=99s a limit on what we can do to help users?  :-)
>=20
> Ludo=E2=80=99.

If users have no idea what value to use though, they just won't use the
feature...