Re: Native OS pipelines in eshell and Emacs

[Dmitry Gutov <dmitry@gutov.dev>]

On 28/05/2024 17:42, Spencer Baugh wrote:
> This same ability would be useful for project.el, where it would be nice
> for the output of project-files (e.g. "git ls-files") to be piped
> directly to xargs grep for commands like project-find-regexp, instead of
> sending the data through Emacs which makes it substantially slower.

I have indeed been considering something like that for project-files -> 
xref-matches-in-files. But mostly in broad strokes.

> Specifically, the new feature would be something like an :stdin argument
> to make-process which allows a make-pipe-process (or other process) to
> be passed as stdin, and grabs the output file descriptor from that
> process (what Emacs would normally read) and passes it down as stdin for
> the new process instead.

It would be doubly interesting if we manage to implement it so that 
Tramp would be able to connect two processes directly without 
round-tripping the i/o from the remote host to local and back to remote. 
That's a major source of latency in project-find-regexp on remote.