Define own \rowfont (without using tabu)

Question

Since the future of tabu is not that safe I’m trying to define an own \rowfont macro. This is what I’ve got so far:

\documentclass{article}

\usepackage{array,tabularx}
\usepackage[table]{xcolor}
\usepackage{xparse,etoolbox}

\ExplSyntaxOn\makeatletter

\int_new:N \l_@@_last_rownum_int

\cs_new_nopar:Npn \@@_current_rowfont: { }

\NewDocumentCommand { \rowfont } { m } {
   \cs_gset_nopar:Npn \@@_current_rowfont: { #1 }
   #1
}

\newcolumntype { L } {
   >{
      \int_compare:nNnTF { \int_use:N \l_@@_last_rownum_int } = { \number \rownum } {
         \@@_current_rowfont:
      } {
         \cs_gset_nopar:Npn \@@_current_rowfont: { }
         \@@_current_rowfont:
      }
   }
   l
   <{
      \int_gset:Nn \l_@@_last_rownum_int { \number \rownum }
   }
}
\newcolumntype { x } {
   >{
      \int_compare:nNnTF { \int_use:N \l_@@_last_rownum_int } = { \number \rownum } {
         \@@_current_rowfont:
      } {
         \cs_gset_nopar:Npn \@@_current_rowfont: { }
         \@@_current_rowfont:
      }
   }
   X
   <{
      \int_gset:Nn \l_@@_last_rownum_int { \number \rownum }
   }
}

\rowcolors { 0 } { } { }

\ExplSyntaxOff\makeatother

\begin{document}
tabular:
\begin{tabular}{LLL}
   \rowcolor{black}\rowfont{\color{red}}
   1 & 2 & 3 \\
   1 & 2 & 3 \\
\end{tabular}

\bigskip

tabularx:
\begin{tabularx}{0.5\textwidth}{xxx}
   \rowcolor{black}\rowfont{\sffamily\footnotesize\color{red}}
   1 & 2 & 3 \\
   1 & 2 & 3 \\
\end{tabularx}
\end{document}

result

Problems

In {tabularx} the row using \rowfont gets enlarged when the argument of \rowfont contains \color.
It only works when using \rowcolors.
It can be used with special column types only.

Maybe it is possible to solve the problems with another definition …

I don't know why its future is unsafe but since it is LPPL licensed, why don't you just make a copy and rename it? Or just see how tabu codes it? I guess that I'm not understanding the question. Is the point to do this in l3 syntax because the current code will be incompatible with LaTeX 3? (This is just a guess which tries to make sense of the motivation for the question. If that's the case, doubtless others less ignorant than me will not need the clarification.) — cfr, May 13 '14 at 02:39
@cfr: The future is unsafe because there will be a new implementation incompatible with the old one (see http://tex.stackexchange.com/q/121841/4918). Sure I can duplicate the whole package but I’m interested in how a stand alone implementation works to improve my LaTeX skills further … copying the code form tabu is not easy, because it redefines the cell-handling by adding hooks for \rowfont — Tobi, May 13 '14 at 07:44

score 2 · Accepted Answer · answered Aug 02 '21 at 03:11

An an alternative to tabu package, tabularray package provides a easy way to set row fonts and colors:

\documentclass{article}
\usepackage{tabularray}
\usepackage{xcolor}
\begin{document}
\begin{tblr}{
   width = 0.5\textwidth, colspec = {X[1]X[2]X[3]}, hlines,
   row{1} = {bg=gray9, fg=red3, font=\sffamily\footnotesize},
}
   1 & 2 & 3 \\
   1 & 2 & 3 \\
\end{tblr}
\end{document}

Define own \rowfont (without using tabu)

1 Answers1