Re: multiple EXPORT_LATEX_HEADER lines

[Nick Dokos]

Dominik Schrempf <dominik.schrempf@gmail.com> writes:

> Hello,
>
> are you looking for, e.g.,
>
> #+latex_header: \addbibresource{bibliography.bib}
> #+latex_header_extra: do some stuff
> #+latex_header_extra: and even more
>
> I don't use the EXPORT keyword at the beginning, I am not sure if it is 
> needed.
>
> Best,
> Dominik

Just as a clarification: the "_extra" here does not mean "append to previous 
value".

The only difference between "#+latex_header: " and #+latex_header_extra: " is
that anything specified in the former is *also* used when constructing the 
header
for the LaTeX file for previewing LaTeX fragments, whereas anything specified 
in the
latter is only used when exporting: it is not used when previewing.

See

    (info "(org) LaTeX header and sectioning")

which says:

,----
|    The LaTeX export back-end appends values from ‘LATEX_HEADER’ and
| ‘LATEX_HEADER_EXTRA’ keywords to the LaTeX header.  The docstring for
| ‘org-latex-classes’ explains in more detail.  Also note that LaTeX
| export back-end does not append ‘LATEX_HEADER_EXTRA’ to the header when
| previewing LaTeX snippets (see *note Previewing LaTeX fragments::).
`----

and the code in ox-latex.el:org-latex-make-preamble.

>
> Alan Schmitt <alan.schmitt@polytechnique.org> writes:
>
>> Hello,
>>
>> I would like to have a multi-line export header when exporting a
>> subtree. I tried this:
>>
>> :EXPORT_LATEX_HEADER: \makeatletter
>> :EXPORT_LATEX_HEADER+: \@setplength{refvpos}{\useplength{toaddrvpos}}
>> :EXPORT_LATEX_HEADER+: \makeatother
>>
>> The problem is that it's exported on a single line, and as such it does
>> not work. Is there a way to have the multiple properties exported as
>> multiple lines, or to specify in the property there is a line break?
>>
>> Thanks,
>>
>> Alan
>
>
>

-- 
Nick

"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler