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I'm trying to patch \\ in tabular enviros using \@tabularcr as I've read that it uses it internally, and I'd like to simply add \midrule on each row (my real-life use is a bit more complex, but simplified here for MWE sake). I've tried \apptocmd as well but got a failure. Please see below. I don't get a failure for trying to patch it this way, but the midrules do not print.

\documentclass{article}
\usepackage{array}
\usepackage{booktabs}

%%% patching does not work
\makeatletter
\let\old@tabularcr@tabularcr
\def@tabularcr{\old@tabularcr\midrule}
\makeatother


\begin{document}


\begin{tabular}{l}


%%% patching in here doesn't work either
\makeatletter
\let\old@tabularcr@tabularcr
\def@tabularcr{\old@tabularcr\midrule}
\makeatother


Hello\
World\
\end{tabular}


\end{document}
likethevegetable
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  • you are using the array package, so you need to patch another command, see https://tex.stackexchange.com/questions/111668/tabular-with-automatic-hline – Ulrike Fischer Nov 27 '22 at 18:26
  • I see now tht \@arraycr is needed. – likethevegetable Nov 27 '22 at 18:27
  • @likethevegetable no, it isn't, and the suggestion to patch \@xarraycr in the linked question's answers will not lead to correct results as well (it will kill the optional argument of \\). Correct would be to patch both \@xargarraycr and \@yargarraycr. – Skillmon Nov 27 '22 at 18:44
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    @likethevegetable I've added my own code to patch tabular and array in the linked question (it does more than just patching \\ but I guess you could take a look). – Skillmon Nov 28 '22 at 19:57
  • Thanks for nothing that @Skillmon, some good ideas there. – likethevegetable Nov 29 '22 at 12:34

0 Answers0