Hi Paul,

> On 15 Feb 2018, at 08:24, Paul Libbrecht <p...@hoplahup.net> wrote:
> Hello Vincent,
> On 15 Feb 2018, at 7:25, Vincent Massol wrote:
>>> having some experience with TeX I would implement CSS with 
>>> macro-definitions… Every element start would be a call to a macro that 
>>> would check for rules that would apply to its element, including passing 
>>> parameters of their ancestry.
>> Could you give an example of what you mean by macro-definitions? Is this 
>> something that exist in TeX?
> Definitely. The complete TeX is based on macros.
> Basic macros are created using the \def macro.
> See e.g. http://www.tex.ac.uk/FAQ-whatmacros.html
> Closer to the HTML world, there are the LaTeX environments. They are nestable 
> and extensible:  see http://www.tex.ac.uk/FAQ-whatenv.html
> This would be the way to create styles I think.
> Paths are not transported, as far as I know (would they be called maybe 
> environment stack?). That would need to be carried as an extra parameter 
> produced by the renderer. I would also think that recognising complex rules 
> with such as classes would need an amount of coding before the LaTeX is 
> processed.

Very useful thanks. I think this is the same as what I was mentioning using 
.sty files. You would put the defiinition of new environments/macros/etc inside 
this .sty file and then have the XWiki renderer output those new 
environments/macros, allowing the user to tune the .sty file he/she wants to 
use to get the right styling.

>>> However, I guess that your solution seems probably more ad hoc and more 
>>> practical.
>>> Is there any reason that you don’t use the XSL-FO renderer that use LaTeX? 
>>> I thought there were several of them.
>> Do you have a pointer? As I said in my original mail I tried to search for 
>> an XHTML to LaTeX converter/XSLT but couldn’t. If you know of one, I’ll 
>> gladly have a look.
> The world is thinner than I thought.
> The closest I could find are the TEI renderers:
>       http://www.tei-c.org/release/doc/tei-xsl/
>       https://www.tug.org/TUGboat/tb27-0/rahtz.pdf

This seems like the TEI XML format is meant to be used as the input and then 
transformed either to XHTML (web site) or to LaTeX/PDF for publishing. Googling 
quickly I couldn’t find a XHTML -> TEI XSL stylehseet.

> or DocBookLaTeX
>       https://sourceforge.net/projects/dblatex/

This is interesting but we would need to have a proper DocBook renderer. We 
have the start of one though but it would need to be improved a lot.

I’m a bit way of going through too many intermediate tool chain as every time 
you get some mismatch impedance that gets in the way. So I have the feeling 
that for the best result/control the solution would be to directly output LaTeX 
using custom XWiki environments/macros.

If you don’t need this level of control, XWiki users should simply use the PDF 

Now, I’ve just discovered TeX (typesetting engine) and LaTeX (“standard" macros 
on top of TeX) yesterday so this is still new to me and I’m likely to miss a 
lot of things at this stage :)

Opinions are more than welcome!

Thanks again for your help Paul, that’s great

> paul
>>> On 14 Feb 2018, at 21:01, Vincent Massol wrote:
>>>> Hi devs,
>>>> I’m currently working on improving our TeX renderer (which is really a POC 
>>>> ATM), in an effort to see if it could be used to generate nice PDF exports 
>>>> (you generate LaTeX and then you convert to PDF).
>>>> The main issue is that LaTeX doesn’t have any technology for applying 
>>>> style to it (like CSS has for HTML). In addition I wasn’t able to find any 
>>>> good HTML+CSS to TeX converter (as we have for PDFs with XSLT+FOP).
>>>> So right now my idea is to implement some default behavior in the Tex 
>>>> Renderer (that could be configured globally in xwiki.properties and/or in 
>>>> the Admin UI) and give the ability to override specifically in the content.
>>>> For example, imagine that you need to decide how to position table column 
>>>> content (left, centered, right) or whether the rows and/or columns of your 
>>>> table have vertical and horizontal lines (or other configs, autowrap, etc).
>>>> The idea is that the Tex Renderer would support some custom tex-specific 
>>>> parameters. For example:
>>>> (% tex-table-spec=“c | c | c" tex-table-floating="true" 
>>>> tex-table-caption="caption" %)
>>>> |=A|=B
>>>> (% tex-table-row-ending="\hline" %)|a|b
>>>> (by default the table spec would be left aligned with vertical lines, and 
>>>> rows would be separated by horizontal lines).
>>>> If you have some comments or ideas, please let me know.
>>>> Inventing a CSS-like mechanism would just be too hard to implement IMO.
>>>> Thanks
>>>> -Vincent
>>>> PS: If you want to see table options in LaTeX, see 
>>>> https://en.wikibooks.org/wiki/LaTeX/Tables

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