Re: [PATCH] Latex Previewing process: imagemagick use pdflatex by default

[Rasmus <rasmus@gmx.us>]

Hi Feng,

"Feng Shu" <tumashu@163.com> writes:

> From 2cce55f48773f05f1aaeed31be8a53e3f59af312 Mon Sep 17 00:00:00 2001
> From: Feng Shu <tumashu@163.com>
> Date: Tue, 24 May 2016 12:06:41 +0800
> Subject: [PATCH] Latex Previewing process: imagemagick use pdflatex by default
>
> * org.el (org-preview-latex-process-alist):
> ---
>  lisp/org.el | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lisp/org.el b/lisp/org.el
> index 83ac51c..8056016 100644
> --- a/lisp/org.el
> +++ b/lisp/org.el
> @@ -4033,9 +4033,9 @@ All available processes and theirs documents can be found in
>       :image-input-type "pdf"
>       :image-output-type "png"
>       :image-size-adjust (1.0 . 1.0)
> -     :latex-compiler ("latex -interaction nonstopmode -output-directory %o %f")
> +     :latex-compiler ("pdflatex -interaction nonstopmode -output-directory %o %f")
>       :image-converter
> -     ("convert -density %S -trim -antialias %f -quality 100 %b.png")))
> +     ("convert -density %D -trim -antialias %f -quality 100 %b.png")))
>    "Definitions of external processes for LaTeX previewing.
>  Org mode can use some external commands to generate TeX snippet's images for
>  previewing or inserting into HTML files, e.g., \"dvipng\".  This variable tells
> -- 
> 2.1.4

Thanks for the patch.  It looks good.  Feel free to push.

* Aside 1

Re ‘org-preview-latex-process-alist’.

- It should be "you need to install the programs:..."
- :post-clean, it should consider ‘org-latex-logfiles-extensions’
- Note that you haven’t documented "%f" in the :latex-compiler.

* Aside 2

IMO the Correctᵀᴹ approach would be for Org to use the latex processor
specified by the document, when present.

E.g. \mathbb{1} typically requires unicode-math and hence requires
compilation with xelatex or lualatex.

Some things speak against this.

- :image-input-type would be "unpredictable" in the case of dvisvgm (dvi
  vs xdv), but both formats are supported.
- dvipng does not work with xelatex as it only support dvi up to format 2.

Thanks,
Rasmus

-- 
Don't slow down Johnny, leave the Cadillac runnin'