Re: [PATCH] Buffer-local process environments

[Eli Zaretskii]

> From: Arthur Miller <arthur.miller@live.com>
> Cc: Augusto Stoffel <arstoffel@gmail.com>,  michael.albinus@gmx.de,
>   monnier@iro.umontreal.ca,  emacs-devel@gnu.org
> Date: Sat, 28 Aug 2021 16:06:19 +0200
> 
> > And I'm not sure I understand the rationale, and you didn't describe
> > it.  Environment variables and PATH in particular are generally global
> > on the entire system, so what does this feature correspond to?
> > separate environment variables in each shell window?  Why would anyone
> > want to do that?  And why should we make it easier by providing
> > buffer-local values of those, instead of letting each Lisp program
> > that needs it let-bind the variables instead?
> 
> Excuse me if I ask here, it is probably more help than contribution to this
> discussion. Is it possible to let-bind environment variables so that a
> subprocess inherit those? 

Of course.  You let-bind process-environment, and then change the
local value.  We have a number of places where we do that.

> (defun emacs-vision--get-date ()
>   (let ((lang (concat "LANG=" emacs-vision-locale))
>         (lctime (concat "LC_TIME=" emacs-vision-locale)))
>     (with-temp-buffer
>       (insert
>        (shell-command-to-string
>         (concat lang lctime " date +'%A, %B %d'")))
>       (goto-char (- (point-max) 1))
>       (buffer-substring-no-properties
>        (line-beginning-position) (line-end-position)))))
> 
> Do I understand correctly, this patch will let me have separate process
> environment, so I could use separate environment variables in subprocess?

Yes, but that's not what you were asking about, I believe.