Hi all,

I have a macro “mogrify” that eats three tokens of a string and
treats them differently from the rest of the string. I can’t
however use it inside more complex macros. Is there a way out or
an alternative using macros? (No Lua.) Other formatting macros
work fine in the same place.

Any help will be greatly appreciated
Philipp

············· Example Code ············································
% macros=mkvi

\unprotect

\def\mogrify#content{%
  \begingroup
    \let\stopper\relax
    \def\get_first_three##1##2##3##4\stopper{%
      \def\first_three{##1##2##3}%
      \def\rest{##4}%
    }%
    \get_first_three#content\stopper%
    \colored[red]{\first_three}%
    \colored[green]{\rest}%
    \endgraf
  \endgroup%
}

\installnamespace {ww}
\installcommandhandler \????ww {ww} \????ww

\appendtoks
  \setuevalue{\currentww}{\wont_work[\currentww]}
\to \everydefineww

\unexpanded\def\wont_work[#id]{%
  \edef\current_wont_work{#id}%
  \dosingleempty\wont_work_indeed%
}

\def\wont_work_indeed[#setups]#content{%
  \iffirstargument\setupcurrentww[#setups]\fi
  %% here is the problem:
  \doifsomething{\wwparameter{param}}{\mogrify{\wwparameter{param}}}%
  \endgraf
  \framed{#content}%
}

\defineww[wontwork]

\protect

\starttext

\mogrify{foobar}\par%% the macro does work in isolation

\wontwork[param=whatever]{will it work?}
\wontwork[param=]        {this, however, does work}

\stoptext
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