[luatex] letterspacing in LuaTeX

[Ulrike Fischer]

Am Wed, 28 Jul 2010 07:17:00 +0200 schrieb Pablo Rodríguez:


>>> If the above document is supposed to work, I'm afraid it doesn't.

>> Well _this_ document is meant to work in the sense the \so doesn't
>> give an error. But it will not run unattended as it will stop at the
>> \showbox\z@ and wait that you hit "enter". And I also don't know
>> what removing the \tolerance setting means to soul. Probably it will
>> find less break points.
 
> Thanks for the reply, Ulrike.
 
> It doesn't work with Greek text and other non-ASCII characters.

I can't test greek here, but other non-ascii chars seems to work
fine if I set \SOUL at tt to a suitable mono font:


\documentclass[10pt]{book}
\usepackage{soul}
\usepackage{luaotfload}
\usepackage{fontspec}

\makeatletter
 \font\SOUL at tt="DejaVu Sans
Mono"\setbox\z@\hbox{\SOUL at tt-}\SOUL at ttwidth\wd\z@
\def\SOUL at doword{%
    \edef\x{\the\SOUL at word}%
    \ifx\x\empty
    \else
        \SOUL at buffer={}%
        \setbox\z@\vbox{%
            \SOUL at tt
            \hyphenchar\font`\-
            \hfuzz\maxdimen
            \hbadness\@M
            \pretolerance\m at ne
       %     \tolerance\@M %<--------------
            \leftskip\z@
            \rightskip\z@
            \hsize1sp
            \everypar{}%
            \parfillskip\z@\@plus1fil
            \hyphenpenalty-\@M
            \noindent
            \hskip\z@
            \relax
            \the\SOUL at word}%
        %\showbox\z@    %<------showbox 
        \let\SOUL at errmsg\SOUL at error
        \let\-\relax
        \count@\m at ne
        \SOUL at analyze
        \SOUL at word={}%
    \fi
}
\makeatother

\begin{document}
\so{a䀀€öü}
\end{document}

-- 
Ulrike Fischer