bug#63778: [PATCH] Use comint-pager in eshell

[Morgan Smith <Morgan.J.Smith@outlook.com>]

This is my very official petition to change gnus defaults.  I have added
this to my config to avoid future mess-ups.

(keymap-set gnus-summary-mode-map "R" #'gnus-summary-very-wide-reply-with-original)

Morgan Smith <Morgan.J.Smith@outlook.com> writes:

> Jim Porter <jporterbugs@gmail.com> writes:
>
>> On 5/28/2023 3:45 PM, Morgan Smith wrote:
>>> I know many people set PAGER=cat for eshell so I wanted to add support
>>> to eshell for this recent feature that was added (comint-pager).
>>
>> Thanks for the patch. While I'd use this myself, I'm not sure it should be the
>> default though. Eshell lets you define visual commands
>> ('eshell-visual-commands', 'eshell-visual-subcommands') that will open up in
>> M-x term. That way, you can use "less" (or whatever your default pager is) as
>> usual. If you set PAGER to "cat" or something similar, then you likely wouldn't
>> get the benefit of this visual command support.
>>
>> Maybe we could do something where we set PAGER like in your patch, but only if
>> Eshell doesn't think the command is visual? Perhaps you could keep the
>> definition of PAGER in esh-var.el as you've done here, but then in em-term.el,
>> add an appropriate override for it? That way, a user who disables the
>> eshell-term module will always get PAGER=cat. Users who do use eshell-term
>> would get a behavior compatible with visual commands.
>>
>
> I haven't the time left in the day to investigate the conflict between
> visual commands and this patch (which I will do) but I would like to
> comment that I believe most users will use one or the other, not both.
> Unless pagers offer features I'm unaware of, I believe it is a better
> user experience to simply dump everything into the current buffer and
> use Emacs as a pager.  For very visual command like pulsemixer that use
> ncurses stuff I don't believe having $PAGER set would really affect
> anything.  So I would like to ask, does anyone actually want to use the
> visual command stuff just for paging stuff?
>
> I would also like to point out that the default value for comint-pager
> is nil so people would have to turn this on manually.  If the usecase
> for comint-pager is significantly different between eshell and other
> comint stuff we could consider a new variable specifically for eshell.
> Personally I don't see a big difference between say ielm and eshell so I
> would like to avoid this but I'll bring it up regardless.