Re: dired-do-find-regexp failure with latin-1 encoding

[Eli Zaretskii <eliz@gnu.org>]

> Cc: stephen.berman@gmx.net, emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 29 Nov 2020 18:27:24 +0200
> 
> > How can --pre help?  It still cannot easily support different
> > encodings in the same command, right?
> 
> It can help by calling iconv with different arguments depending on the 
> contents of each file. Which is valuable, I think, because we're 
> normally not piping file contents to grep (or, potentially, rg), instead 
> we pass multiple file names to it using xargs.
> 
> That wouldn't be easy, but some script that performs conversion based on 
> file contents could work.

It could work in principle, but I think in practice it will not be
faster than doing everything in Emacs Lisp, because each file will
need to be read twice.

> > It would be brittle, unless that program actually reads the entire
> > file (which will be slow).
> 
> How does Emacs do it? Does it read until the end of the file?

No, just a small initial part of it.  That's one reason why the
results are not guaranteed to be correct.