On Mon, 2 Nov 2020 at 15:43, Eli Zaretskii <
eliz@gnu.org> wrote:
> From: Reuben Thomas <rrt@sc3d.org>
> Date: Mon, 2 Nov 2020 08:35:13 +0000
> Cc: dinkonin <dinkonin@gmail.com>, 44318@debbugs.gnu.org
>
> I believe that the ispell.el code (which I wrote) is buggy: it should not be incorporating warnings into its
> output.
>
> Also, the patch I offered is a simplification of the original code. So, I don't think we are losing here.
>
> Eli, I quite agree with your sentiment, and I would certainly not advocate installing a workaround in Emacs
> unless there were compelling reasons. However, I do not see this as a workaround, and as it is also a
> simplification, I don't see a problem.
I have a problem with ignoring stderr because it can provide some
useful information.
It is not so much a question of ignoring stderr (for example, this output could be shown to the Emacs user), it is a question of not treating it as part of the output of enchant-lsmod.
Moreover, no one said that some client of Enchant, current or future, won't decide to produce non-error output
on stderr.
I'm not sure what you mean here. "enchant-lsmod" simply queries its own providers (spelling back-ends). I maintain all the code involved (there are currently no third-party providers for Enchant that I'm aware of), and, for what it's worth, decide how it should work.
In this case, the providers should not be outputting anything, either to stderr or stdout, and indeed, they do not. It is enchant-lsmod that emits the warning when it cannot load a provider. This is a legitimate warning, but it does not form part of its output.
So I, as upstream maintainer, am telling you that indeed, it is not correct that Emacs should take enchant-lsmod's stderr as part of its output! (As I said above, it would be possible to capture stderr separately and display it to the user, though I don't recommend that currently, because the warnings are not written for users. Other programs that use Enchant do not show these warnings, they simply omit providers that do not load from the list of languages/spelling checkers that are available.)