Re: [ELPA] New package: dired-duplicates

[Eli Zaretskii]

> From: Visuwesh <visuweshm@gmail.com>
> Cc: Philip Kaludercic <philipk@posteo.net>,  h.judt@gmx.at,
>   emacs-devel@gnu.org
> Date: Wed, 01 Nov 2023 19:23:32 +0530
> 
> [புதன் நவம்பர் 01, 2023] Eli Zaretskii wrote:
> 
> >> From: Philip Kaludercic <philipk@posteo.net>
> >> Cc: emacs-devel@gnu.org
> >> Date: Tue, 31 Oct 2023 12:21:51 +0000
> >> 
> > What I would like to ask is whether Harald tried to calculate SHA256
> > using Emacs's own primitives, instead of relying on an external
> > program, which may or may not be installed.
> 
> >From OP,
> 
>     The only external requirement is a checksum program like md5 or
>     sha256sum that generates a hash value from the contents of a file used
>     for comparison, because Emacs cannot do that in a performance-efficient
>     way.
> 
> So I guess the answer is no.

I'd like to see the numbers which led to the conclusion that
performance was prohibitive.

And even if the performance is indeed much worse, it could be a
fallback in case the program is not available -- which would IMO be
much better than simply failing to provide the functionality in that
case.