Re: [patch] ox-latex.el: Add `LATEX_PRE_HEADER' keyword

[Ihor Radchenko <yantar92@posteo.net>]

Juan Manuel Macías <maciaschain@posteo.net> writes:

> Rationale for this patch: in certain cases, in a LaTeX document, it is
> necessary to add code before the class declaration (\documentclass...).
> For example, commands like \PassOptionsToPackage, \DocumentMetadata{ },
> etc.; or certain packages that should be loaded first using
> \RequirePackage{}; and other miscellaneous cases[1]. I think that by
> defining a new keyword `latex_pre_header', which behaves the same as
> latex_header but concatenated before the class, these situations can be
> resolved from Org.

Thanks for the patch!
It looks reasonable.

> https://gnutas.juanmanuelmacias.com
> From ac6b743a4489f7bc8ab1cdae7ffd3b36e5f3c1d2 Mon Sep 17 00:00:00 2001
> From: Juan Manuel Macias <maciaschain@posteo.net>
> Date: Sat, 16 Sep 2023 19:22:39 +0200
> Subject: [PATCH] lisp/ox-latex.el (latex): Add `LATEX_PRE_HEADER' keyword
>
> * (org-latex-make-preamble): In some cases it is necessary to add code
> before the `\documentclass' line. `LATEX_PRE_HEADER' behaves the same as
> `LATEX_HEADER', except that it is concatenated before the class.

I think that you do not need to `quote' LATEX_PRE_HEADER - it is not a
lisp symbol.

Also, the new keyword should be documented in the manual.

> -	      (user-error "Unknown LaTeX class `%s'" class))))
> +	      (user-error "Unknown LaTeX class `%s'" class)))
> +         (pre-header (mapconcat
> +		      #'org-element-normalize-string
> +		      (list (plist-get info :latex-pre-header) ""))))

mapconcat is redundant here.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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