Need help in customising class ltxdoc. I would like to colour code macrocode environments so as to facilitate the visual distinction between package's macro code and it associated documentation.

I tried to create a new environment:


That failed with a capacity size exceeded (set for the occasion to 100000).

I had a look at ltxdoc.dtx to see if I could simply import the macrocode environment. But its implementation is too cryptic for me.

Thanks for any insight here :-)


You can use the environment hooks from the package etoolbox in the first part of the .dtx.


% \iffalse
% \fi
% \StopEventually{}
%This is a description of the code below.
%    \begin{macrocode}
  \mathchardef\implies="3221 \mathchardef\impliedby="3220 \mathchardef\Implies=%
"3229 \mathchardef\Impliedby="3228 \mathchardef\implic="2221 \mathchardef
\implicby="2220 \mathchardef\Implic="2229 \mathchardef\Implicby="2228 \let
%    \end{macrocode}
% \Finale

Result (with latex dtxcolor.dtx):

enter image description here

| improve this answer | |
  • When the macrocode environment is immediately preceded by with a \DescribeMacro{mymacro}, the mymacro in the margin gets coloured too. Adding some documentation text between \DescribeMacro{mymacro} and \begin{macrocode} resolves the colour issue. – JM. Marcastel Dec 6 '17 at 13:48
  • @JM.Marcastel you might be able to patch DescribeMacro as well (with pretocmd etc.), for example put \color{black} in front and \color{blue} at the end. – Marijn Dec 6 '17 at 14:23

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