Sebastian P. Luque writes:
> This is great, and very interesting to learn about the BIND keyword.
>
> Thank you,
You're welcome. Of course, if you use the filter very often, it is not
necessary to include it in a document or use the bind keyword. It
would be enough to add the function to your init and the line:
(add-to-list 'org-export-filter-final-output-functions #'caption-auto-width)
In a case like this, however, I would prefer to use the other function
in Lua within LuaTeX, since two commands could be defined: one to enable
the automatic caption width and one to disable it, throughout the
document. E.g.:
#+begin_src latex
\usepackage{luacode}
\begin{luacode*}
function caption_width ( text )
text = string.gsub ( text, "(\\includegraphics.+)", "\\sbox0{%1}")
text = string.gsub ( text, "(\\caption.+)",
"\\begin{minipage}{\\wd0}\\usebox0%1\\end{minipage}")
return text
end
\end{luacode*}
\newcommand\CaptionAutoWidthOn{\directlua{luatexbase.add_to_callback
( "process_input_buffer" , caption_width , "caption_width" )}}
\newcommand\CaptionAutoWidthOff{\directlua{luatexbase.remove_from_callback
( "process_input_buffer" , "caption_width" )}}
#+end_src
\CaptionAutoWidthOn
#+CAPTION: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec
hendrerit tempor tellus
#+ATTR_LaTeX: :width .3\linewidth
[[img.jpg]]
\CaptionAutoWidthOff
#+CAPTION: Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec
hendrerit tempor tellus
#+ATTR_LaTeX: :width .1\linewidth
[[img.jpg]]
