GNU bug report logs - #57129
29.0.50; Improve behavior of conditionals in Eshell

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From: Jim Porter <jporterbugs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>, Paul Eggert <eggert <at> cs.ucla.edu>
Cc: larsi <at> gnus.org, 57129 <at> debbugs.gnu.org
Subject: bug#57129: 29.0.50; Improve behavior of conditionals in Eshell
Date: Sat, 20 Aug 2022 11:03:27 -0700

[Message part 1 (text/plain, inline)]

On 8/15/2022 11:58 AM, Eli Zaretskii wrote:
>> Cc: larsi <at> gnus.org, 57129 <at> debbugs.gnu.org
>> From: Jim Porter <jporterbugs <at> 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 (text/plain, attachment)]

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