GNU bug report logs - #46351
28.0.50; Add convenient way to bypass Eshell's own pipelining

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From: Sean Whitton <spwhitton <at> spwhitton.name>
To: Michael Albinus <michael.albinus <at> gmx.de>, Eli Zaretskii <eliz <at> gnu.org>, 46351 <at> debbugs.gnu.org
Subject: bug#46351: 28.0.50; Add convenient way to bypass Eshell's own pipelining
Date: Mon, 27 Dec 2021 12:21:53 -0700

Hello,

On Mon 27 Dec 2021 at 08:22PM +02, Eli Zaretskii wrote:

> The easiest way is to add a user option that would make every pipe use
> the external shell.

On Mon 27 Dec 2021 at 07:26PM +01, Michael Albinus wrote:

> One to rule them all. As soon there is one *|, *< or *> in the command
> line, everything is regarded external. Also commands like ls or cat,
> which behave then like *ls or *cat.

I see what you mean now, but I don't think either of these options would
be desirable.  It would mean that you can't combine Lisp functions with
external commands; for example

    my-lisp-function arg1 arg2 | my-cool-encoder *>output.ogg

In this case, the first | needs to use Eshell's own pipelining support.

Similarly something like

    buffer-string #<buffer ...> | my-cool-command *| other-cmd *>file

Does that make sense?  Would you agree that this new feature needs to
work only on individual pairs of commands?

-- 
Sean Whitton

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