How can I pass the content of the TeX variable \jobname to a Lua variable?
(I am using LuaLaTeX with the luacode package.)
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2I'm not clear on what you want: Mico's answer seems sensible, but that seems almost trivially-obvious so I wonder if there is more to the question.– Joseph Wright ♦Aug 30, 2014 at 8:53
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Indeed, <code>\luadirect{p = \luastring{\jobname}}</code> does what I want. Many thanks to Mirco.– Primo PetriAug 30, 2014 at 9:38
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2 Answers
Since you're loading the luacode package, you could make use of its macro \luastring. (Yes, the name of the tex file in this example really is uvw.)
% !TEX TS-program = lualatex
\documentclass{article}
\usepackage{fontspec}
\usepackage{luacode}
\begin{luacode}
function foo(s) -- "s" is a variable
tex.sprint( s )
end
\end{luacode}
\begin{document}\pagestyle{empty}
The value of \verb+\jobname+ is \directlua{tex.sprint(\luastring{\jobname})}.
The value of \verb+\jobname+ is \texttt{\directlua{ foo(\luastring{\jobname})}}.
\end{document}
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@egreg - the macro
\luastring{...}creates a Lua variable, which gets operated on bytex.sprintin the MWE. I've modified the MWE to set up a function that explicitly operates on a variablesthat contains the value of\luastring{\jobname}.– MicoAug 30, 2014 at 9:52 -
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@koppor - Sure can! (a) Plunk the three lines of Lua code into an external file called, say,
myfile.lua. (b) Run\directlua{dofile("myfile.lua")}in the preamble. (c) RunThe value of \verb+\jobname+ is \texttt{\directlua{ foo(\luastring{\jobname})}}as in the example shown above. If this instruction needs to be run several times, create a shortcut LaTeX macro, e.g.,\newcommand\printjobname{\texttt{\directlua{foo(\luastring{\jobname})}}}in the preamble (and after runningdofile); then, just typeThe value of \verb+\jobname+ is \printjobnamein the body of the document. Cheers!– MicoMar 7, 2018 at 17:19 -
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An addition to Micos answer, you can also access the original \jobname, which was active at the start of LuaTeX: It is available as tex.jobname.
This will normally be the same as \jobname, except it doesn't change if \jobname is redefined:
% !TEX TS-program = lualatex
\documentclass{article}
\usepackage{fontspec}
\usepackage{luacode}
\begin{document}\pagestyle{empty}
The value of \verb+\jobname+ is \directlua{tex.sprint(\luastring{\jobname})}, the ``real'' jobname is \directlua{tex.sprint(tex.jobname)}.
\renewcommand\jobname{somename}
The value of \verb+\jobname+ is \directlua{tex.sprint(\luastring{\jobname})}, the ``real'' jobname is \directlua{tex.sprint(tex.jobname)}.
% Change back, otherwise LaTeX is unhappy
\edef\jobname{\directlua{tex.sprint(tex.jobname)}}
\end{document}
If the jobname is job, this will result in
answered Mar 7, 2018 at 17:51
