bug#46351: 28.0.50; Add convenient way to bypass Eshell's own pipelining

[Sean Whitton <spwhitton@spwhitton.name>]

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