bug#57129: 29.0.50; Improve behavior of conditionals in Eshell

[Jim Porter]

On 8/15/2022 11:58 AM, Eli Zaretskii wrote:
> > Cc: larsi@gnus.org, 57129@debbugs.gnu.org
> > From: Jim Porter <jporterbugs@gmail.com>
> > Date: Mon, 15 Aug 2022 11:30:07 -0700
> >
> > The temp files are created by Eshell in lisp/eshell/esh-var.el in the
> > function 'eshell-parse-variable-ref', specifically in the part starting
> > with:
> >
> >     (eq (char-after) ?\<)
>
> Ah, okay.  It's a (mis)feature of Gnulib's gen_tempname function
> (which is the guts of make-temp-file) in its implementation for
> MS-Windows (and maybe other platforms?): it always begins from the
> same "random" characters in the file name, and only generates other
> random characters if there's already a file by that name.  So if you
> are careful and delete the temporary file each time after usage, and
> never need more than one temporary file at the same time, you will get
> the same name every call.

In addition to the changes to temporary file name generation, I think it 
would be useful for Eshell to kill the temporary buffer too. If you use 
this feature in Eshell a lot, the temporary buffers could pile up, 
consuming memory for no real benefit. (A user who wanted the buffer to 
stick around would probably redirect to a non-temporary file, or even 
just to a buffer.) Attached is a patch to do this.

0001-Kill-the-buffer-associated-with-a-temp-file-when-usi.patch
Description: Text document