3

I am setting a macro in lualatex, and would like to use ~ as a non-breaking space character. However, it produces a new line between first and last.

\documentclass{scrartcl}
\usepackage{luacode}
\begin{document}
    Note tilde is fine in luacode*.\\
    \begin{luacode*}
        token.set_macro('NAME','First~Last','global')
    \end{luacode*}
    \NAME
\end{document}
likethevegetable
  • 1,474
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    This is not supported by token.set_macro. Just use something along the lines of tex.sprint("\\gdef\\NAME{First~Last}"). – Henri Menke Oct 12 '21 at 16:48

1 Answers1

4

This is possibly a luatex feature...

If I use plain text and \directlua primitive to avoid any interference from macro packages then



\directlua{
        token.set_macro('NAME','First\string~Last','global')
}
\show    \NAME


\def\zz#1{\show#1\ifx!#1\else\expandafter\zz\fi}


\expandafter\zz\NAME!


\bye

where the \show\NAME shows ~1 instead of just ~ where the ~1 produces a line break.

> \NAME=macro:
->First~1Last.
l.6 \show    \NAME

The loop then shows each token and you get:

> the letter F.
> the letter i.
> the letter r.
> the letter s.
> the letter t.
> [unknown command code! (13, -1113986)].
> the letter L.
> the letter a.
> the letter s.
> the letter t.

So basically the token library hasn't wanted to add the active character.

David Carlisle
  • 757,742
  • 1
    See Marcel's comment here https://chat.stackexchange.com/transcript/message/59327212#59327212 I think basically this isn't supported you need to add \nobreak\space rather than the active ~ or in latex use \nobreakspace – David Carlisle Oct 08 '21 at 23:19
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    I would even call this a duplicate of https://tex.stackexchange.com/questions/519954/backslashes-in-macros-defined-in-lua-code. See in particular my “answer” over there. – Henri Menke Oct 12 '21 at 16:46