bug#72018: 30.0.60; [PATCH] Don't emit a prompt when a background Eshell process is killed

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 10 Jul 2024 09:16:11 -0700
> Cc: 72018@debbugs.gnu.org
> From: Jim Porter <jporterbugs@gmail.com>
> 
> On 7/10/2024 4:16 AM, Eli Zaretskii wrote:
> > 
> > I don't think I understand the essence of the change, and thus cannot
> > appreciate its effects enough to be able to answer this.  What is the
> > significance of '(car command)' in this hunk:
> 
> 'command' is a "command entry", and the result of 
> 'eshell-commands-for-process', which returns a list of elements of the form:
> 
>      (BACKGROUND FORM PROCESSES)
> 
> BACKGROUND is non-nil if the command is being run in the background.
> 
> >> +          ;; Reset the prompt if the command we just aborted was in the
> >> +          ;; foreground.
> >> +          (unless (car command)
> >> +            (declare-function eshell-reset "esh-mode" (&optional no-hooks))
> >> +            (eshell-reset)))))))
> > 
> > IOW, why '(car command)' is used as an indication of a fore/background
> > command?  Also, why does the comment say "foreground" while your text
> > says we don't want the prompt if the killed program was in the
> > background?
> 
> We want to reset the prompt (this just emits a new command prompt) for 
> foreground commands, but for background commands, we don't need to do 
> anything. Would it be clearer if I inverted the wording in the comment, 
> like, "Don't reset the prompt if the command we just aborted was in the 
> background"?

I think these subtleties just warrant more detailed comments, and then
we'll be fine.