Tabularray: expand multiple macros with background color

Question

I'm trying to expand in tabularry multiple macros to automatically add different background colors, but the color is not taken into account:

\documentclass{memoir}
\usepackage{tabularx}
\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{booktabs}
\NewExpandableDocumentCommand{\yes}{O{Yes}m}{\SetCell{bg=green9} #1}
\NewExpandableDocumentCommand{\no}{O{No}m}{\SetCell{bg=red8} #1}
\begin{document}
\begin{tblr}[expand=\expandafter]{cc}
  What I want & is below\
  \SetCell{bg=green9} Yes & \SetCell{bg=red8} No\
  \SetCell{bg=green9} Great & \SetCell{bg=red8} Bad\
  What I get & is below\
  \expandafter\empty\yes{} & \expandafter\empty\no{}\
  \expandafter\empty\yes[Great]{} & \expandafter\empty\no[Bad]{}
\end{tblr}
\end{document}

Related, but don't fix my issue: tabulararray: can't use def to set cell properties? tabularray: Expand multiple macros

expandable doesn't mean "expands in one step" (as you would need for \expandafter). Beside this: even if it would expand to \SetCell, it wouldn't work as there is still the \empty before, and something like \empty\SetCell{bg=green9} Yes doesn't work. — Ulrike Fischer, Feb 15 '23 at 14:48
@UlrikeFischer I see thanks… so there is no way to achieve what I want to do? — tobiasBora, Feb 15 '23 at 16:46
Do you need any text inside these macros or just to adjust the color? — Udi Fogiel, Feb 15 '23 at 17:28

egreg · Answer 1 · 2023-02-16T00:11:49.900

From the manual of tabularray:

So, NO optional argument. That's not possible. And only one macro can be expanded.

\documentclass{memoir}
\usepackage{tabularx}
\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{booktabs}
\newcommand{\yn}[2]{\SetCell{bg=\if#1ygreen9\else red8\fi}#2}
\begin{document}
\begin{tblr}[expand=\yn]{cc}
  What I want & is below\
  \SetCell{bg=green9} Yes & \SetCell{bg=red8} No\
  \SetCell{bg=green9} Great & \SetCell{bg=red8} Bad\
  What I get & is below\
  \yn{y}{Yes} & \yn{n}{No}\
  \yn{y}{Great} & \yn{n}{Bad}
\end{tblr}
\end{document}

A possibly better definition of \yn is

\ExplSyntaxOn
\cs_new:Npn \yn #1 #2
 {
  \SetCell{bg=\str_case:nn {#1}{{y}{green9}{n}{red8}}}#2
 }
\ExplSyntaxOff

With standard methods:

\documentclass{memoir}
\usepackage[table]{xcolor}
\usepackage{ninecolors}
\NewExpandableDocumentCommand{\yes}{O{Yes}m}{\cellcolor{green9}#1}
\NewExpandableDocumentCommand{\no}{O{No}m}{\cellcolor{red8}#1}
\begin{document}
\begin{tabular}{cc}
  First & Second \
  \yes{} & \no{}\
  \yes[Great]{} & \no[Bad]{}
\end{tabular}
\end{document}

Thanks… but actually lvjr found a solution based on \expanded (I created a new answer below) — tobiasBora, Feb 16 '23 at 07:37

Udi Fogiel · Answer 2 · 2023-02-15T18:43:01.873

If you don't need any text inside the commands, and just want a shorter macro name for \SetCell{bg=red8}, tabularray has the command \NewTableCommand for that (see section 3.6 and subsection 3.2.3 of the documentation):

\documentclass{memoir}
\usepackage{tabularx}
\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{booktabs}
\NewTableCommand\yes{\SetCell{bg=green9}}
\NewTableCommand\no{\SetCell{bg=red8}}
\begin{document}
\begin{tblr}{cc}
    What I want &amp; is below\\
    \SetCell{bg=green9} Yes &amp; \SetCell{bg=red8} No\\
    \SetCell{bg=green9} Great &amp; \SetCell{bg=red8} Bad\\
    What I get &amp; is below\\
     \yes Yes &amp; \no No\\
    \yes Great &amp; \no Bad
\end{tblr}

\end{document}

Thanks for this trick! (+1) But ideally I'd love to be able to add text as well. — tobiasBora, Feb 15 '23 at 19:11

tobiasBora · Answer 3 · 2023-02-16T07:42:20.950

That's the great answer of lvjr (here, feel free to write your own answer if you want me to accept it), whose trick is to use \expanded:

\documentclass{memoir}
\usepackage{xcolor}
\usepackage{tabularray}
\NewExpandableDocumentCommand{\yes}{O{Yes}m}{\SetCell{bg=green9}#1}
\NewExpandableDocumentCommand{\no}{O{No}m}{\SetCell{bg=red8}#1}
\begin{document}
\begin{tblr}[expand=\expanded]{cc}
  What I want               & is below              \
  \SetCell{bg=green9} Yes   & \SetCell{bg=red8} No  \
  \SetCell{bg=green9} Great & \SetCell{bg=red8} Bad \
  What I get                & is below              \
  \expanded{\yes{}}         & \expanded{\no{}}      \
  \expanded{\yes[Great]{}}  & \expanded{\no[Bad]{}}
\end{tblr}
\end{document}

Note that you need to protect fragile commands (if any) inside them with \unexpanded command.

Tabularray: expand multiple macros with background color

3 Answers3

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