Re: [Pre-PATCH] Overhaul of the LaTeX preview system

["K. Chousos" <K.Chousos@protonmail.com>]

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Hello Timothy.

First of all, thank you for your contribution. I use your fork for some days
now and I can verify that it is working correctly. I have only faced the following problems:

1. When a snippet contains a mistake, it correctly turns red, but no error message
   is shown when I hover my mouse over it. I have to switch to the *Org Preview LaTeX Output*
   to see the error.

2. Live previews do not work (like shown here https://tinyurl.com/5fu7z27w), although
   I am using the related options and use your branch up to the ---PATCH SET DIVIDER--- commit.

3. When using your version, the ox-hugo exporter no longer works when latex is involved.
   The error that appears is the following:
   org-html-format-latex: Invalid function: org-export-with-buffer-copy

4. Some key-binds (like C-c C-e to publish or C-c C-x C-l for latex-preview) do not work
   when the cursor is at the top of the file, before the first header.

In the attachments there are the diagnostics from the org-latex-preview-check-health
function and my relevant configuration.

Again, thank you for this amazing overhaul and I hope it won't be long till
we see it merged in the official Org branch.

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Your LaTeX preview process

Precompile with dvilualatex → LaTeX Compile with lualatex → Convert to SVG with dvisvgm

lualatex
This is LuaHBTeX, Version 1.15.0 (TeX Live 2022)
/usr/bin/lualatex

Warning: Precompilation not available with "lualatex"!

dvisvgm
dvisvgm 3.0.1
/usr/bin/dvisvgm

LaTeX preview options
• Precompilation           ON
• Equation renumbering     ON
• Caching with org-persist OFF

LaTeX preview sizing
• Page width  0.75   (display equation width in LaTeX)
• Scale       1.50  (PNG pixel density multiplier)
• Zoom        1.20  (display scaling factor)

LaTeX preview preamble
\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
[DEFAULT-PACKAGES]
[PACKAGES]
\usepackage{xcolor}

Diagnostic info (copied)

(:image-converters
 (("convert" "Version: ImageMagick 7.1.1-4 Q16-HDRI x86_64 20976 https://imagemagick.org" "/usr/bin/convert")
  ("dvisvgm" "dvisvgm 3.0.1" "/usr/bin/dvisvgm")
  ("dvipng" "This is dvipng 1.17 Copyright 2002-2015, 2019 Jan-Ake Larsson" "/usr/bin/dvipng"))
 :latex-processors
 (("lualatex" "This is LuaHBTeX, Version 1.15.0 (TeX Live 2022)" "/usr/bin/lualatex")
  ("xelatex" "XeTeX 3.141592653-2.6-0.999994 (TeX Live 2022)" "/usr/bin/xelatex")
  ("pdflatex" "pdfTeX 3.141592653-2.6-1.40.24 (TeX Live 2022)" "/usr/bin/pdflatex"))
 :interactive t :org-version "9.7-pre" :modified
 ((org-latex-preview-persist)
  (org-persist-after-read-hook org-element--cache-persist-after-read)
  (org-latex-preview-options :foreground auto :background "Transparent" :scale 1.5 :matchers
                             ("begin" "$1" "$" "$$" "\\(" "\\[")
                             :zoom 1.2)
  (org-latex-preview-preamble . "\\documentclass{article}\n\\usepackage{amsmath}\n\\usepackage{amssymb}\n\\usepackage{amsfonts}\n[DEFAULT-PACKAGES]\n[PACKAGES]\n\\usepackage{xcolor}")
  (org-latex-compiler . "lualatex")
  (org-latex-preview-width . 0.75)
  (org-latex-preview-numbered . t)
  (org-persist-before-read-hook org-element--cache-persist-before-read)
  (org-latex-format-drawer-function .
                                    #[514 "\207"
                                          []
                                          3 "\n\n(fn _ CONTENTS)"])
  (org-latex-format-headline-function . org-latex-format-headline-default-function)
  (org-latex-src-block-backend . minted)
  (org-latex-hyperref-template . "\\hypersetup{\npdfauthor={%a},\npdftitle={%t},\npdfkeywords={%k},\npdfsubject={%d},\npdfcreator={%c},\npdflang={%L},\ncolorlinks,\nlinkcolor=blue,\ncitecolor=red,\nurlcolor=blue}")
  (org-latex-format-inlinetask-function . org-latex-format-inlinetask-default-function)
  (org-persist-before-write-hook org-element--cache-persist-before-write)
  (org-latex-pdf-process "latexmk -output-directory=%o %f")
  (org-latex-preview-use-precompilation)))

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(setq org-latex-compiler "lualatex"
      org-latex-preview-auto-generate 'live
      org-latex-preview-persist nil
      org-latex-preview-processing-indicator 'fringe
      org-latex-preview-numbered t
      org-latex-preview-width 0.75
      org-latex-preview-use-precompilation nil
      ;; org-latex-preview-live-display-type 'eldoc
      org-startup-with-latex-preview t
      org-latex-preview-auto-generate t)

(setq org-latex-preview-preamble
      "\\documentclass{article}
\\usepackage{amsmath}
\\usepackage{amssymb}
\\usepackage{amsfonts}
[DEFAULT-PACKAGES]
[PACKAGES]
\\usepackage{xcolor}")

;; \\usepackage{polyglossia}  
;; \\setmainlanguage{greek}   
;; \\setotherlanguage{english}

(plist-put org-format-latex-options :zoom 1.2) ; Calibrated based on the TeX font and org-buffer font.

(add-hook 'org-mode-hook #'org-latex-preview-auto-mode)