When I use the code given, it compiles and displays fine. But when I try replacing \everypar with \EveryPar, it halts during compiling with this complaint:
"A number should have been here; I inserted '0'. (If you can't figure out why I
needed to see a number, look up 'weird error' in the index to The TeXbook.)
mtx-context | fatal error: return code: 1
"
On Monday, October 10, 2022 at 09:58:11 PM MDT, Wolfgang Schuster
Hi Joel,
On Mon, 2022-10-10 at 12:46 +0000, Joel wrote:
Hello Max, It is preferred if the solution is just three lines per paragraph, rather than some content parallel to the text A Lua callback solution:
[...]
An \everypar solution:
\appendtoks% \vbox to 0pt{% \dorecurse{3}{% \rlap{% \hskip\dimexpr\hsize+1em% \vrule height 0.4pt width 3cm% \relax% }% }% }% \to\everypar
You can use the \EveryPar register but \everypar is off limits. Wolfgang