[luatex] letterspacing in LuaTeX

[Pablo Rodríguez]

On 07/26/2010 11:04 AM, Ulrike Fischer wrote:
> \documentclass[10pt]{book}
> \usepackage{soul}
> \makeatletter
> \showboxdepth=100
> \def\SOUL at analyze{{%
>      \setbox\z@\vbox{%
>          \unvcopy\z@
>          \unskip
>          \unpenalty
>         \global\setbox\@ne=\lastbox}%
>      \showbox\@ne  %show box @ne
>      \ifvoid\@ne
>      \else
>          \setbox\@ne\hbox{\unhbox\@ne}%
>          \SOUL at syllgoal=\wd\@ne
>          \showthe\SOUL at syllgoal %show goal
>          \advance\count@\@ne
>          \SOUL at analyze
>          \SOUL at syllwidth\z@
>          \SOUL at syllable={}%
>          \ifnum\count@>\z@
>              \advance\SOUL at syllgoal-\SOUL at ttwidth
>              \SOUL at dosyllable
>              \SOUL at getkern{\the\SOUL at lasttoken}{\SOUL at hyphkern}%
>                  {\SOUL at sethyphenchar}%
>              \SOUL at everyhyphen
>          \else
>              \SOUL at dosyllable
>          \fi
>      \fi
> }}
>
> \begin{document}
> This is only a \so{a}.
> \end{document}

Thanks for your in-depth explanation, Ulrike, but I'm afraid I don't 
understand a word (sorry, but it is too complicated for me).

My LuaTeX version is beta-0.60.2-2010071217 (TeX Live 2010) (rev 3736).

BTW, is the sample document above supposed to work. (I'm afraid it doesn't.)

Thanks for your help,


Pablo