[NTG-context] Tikz CD

[Aditya Mahajan <adityam@umich.edu>]

Hi,

There was a recent question about what appeared to be commutative diagrams, and I wanted to reply saying that one option is to use tikzcd module. However, testing showed that it fails.

This is what tikzlibrarycd.code.tex does:

% ConTeXt-specific stuff
\pgfutil@IfUndefined{starttikzpicture}{}{%
  \def\starttikzcd{\tikzcd}
  \def\stoptikzcd{\endtikzcd}
  \tikzcdset{
    every matrix/.append code={%
      \def\NC{\pgfmatrixnextcell}%
      \def\NR{\pgfmatrixendrow}}}
}


where 

\def\tikzcd@[#1]{%
  \tikzpicture[/tikz/commutative diagrams/.cd,every diagram,#1]%
  ...}

So, it fails because \tikzpicture is being called with wrong catcodes. It can be fixed in the same manner as we patched tikzpicture as shown by the following MWE:

\usemodule[tikz]
\usetikzlibrary[cd]

\permanent\protected\def\starttikzcd%
  {\starttikzinput
   \hcontainer\bgroup
   \tikzcd}

\permanent\protected\def\stoptikzcd
  {\endtikzcd
   \egroup
   \stoptikzinput}

\starttext
\startformula
  \starttikzcd
    x \arrow[d] \NC A \arrow[d] \NC D \NR
    y \NC B \NC D \NR
  \stoptikzcd
\stopformula
\stoptext


What is the best way to go about this? I can try to ask the 

Should we include a wrapper for tikzcd (as we do for circuitikz) or should I try to push a patch upstream. 

BTW, why do we need a \hcontainer in the above code?


Aditya


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