TeX - LaTeX Asked on March 12, 2021
I would like to try to use lualatex in order to use as little as possible Tex code (mostly because it’s unreadable, and overcomplicated). I understand that, because some libraries are coded in Tex, I can’t avoid to write a few ‘tex.sprint’, but I’d like to use the fewer I can.
So here is what I’d like to do: define a function in lua that creates a tcolorbox
, and get on lua side the dimension of the box, in order to display, for example, a picture, or any code I’d have written in lua.
MWE:
test.tex
documentclass{article}
usepackage{lipsum}
usepackage[most]{tcolorbox}
begin{document}%
begin{tcolorbox}
directlua{dofile("file.lua")
displayPicInTCbox("simpson.jpg")
}
end{tcolorbox}
end{document}
file.lua
function displayPicInTCbox(filename)
tex.sprint([[begin{tcolorbox}]])
-- This works, but I'd like to use my own lua function, so can't use it
tex.sprint([[includegraphics[width=tcbtextwidth]{simpson.jpg}]])
img.write({ filename = "simpson.jpg";
-- This does not work
width=tex.dimen['tcbtextwidth']
-- Same problem
-- width="tcbtextwidth"
})
tex.sprint([[end{tcolorbox}]])
end
Thank you! By the way, if you have any advice to replace TeX with Lua, please tell me!
tcbtextwidth
is macro not a length. You can't access tex macros from inside lua, so you should either store it in a length (skip) or expand it before passing to lua:
documentclass{article}
usepackage{lipsum}
usepackage[most]{tcolorbox}
usepackage{luacode}
newlengthlualen{}
begin{luacode}
function insertimageA ()
img.write({ filename = "example-image-A.pdf",width=tex.skip['lualen'].width})
end
function insertimageB (imgwidth)
img.write({ filename = "example-image-A.pdf",width=imgwidth})
end
end{luacode}
begin{document}%
begin{tcolorbox}
setlengthlualen{tcbtextwidth}
directlua{insertimageA()}
directlua{insertimageB("tcbtextwidth")}
end{tcolorbox}
end{document}
Correct answer by Ulrike Fischer on March 12, 2021
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