I have an existing macro that I'd like to extend.
The current definition is \define[3]\mycommand{...} which I'd like to extend to
take an optional 4th parameter plus an optional setup parameter.
Thus I currently invoke it as:
\mycommand{aa}{bb}{cc}
and I'd like to be able to extend it so that any of the following can be used:
\mycommand{aa}{bb}{cc}
\mycommand{aa}{bb}{cc}{dd}
\mycommand{aa}{bb}{cc}{dd}[ee]
or
\mycommand[ee]{aa}{bb}{cc}{dd} % if this is more the ConTeXt way
where {dd} is the optional extra parameter and, if it is present, then [ee] can
also be optionally added (because it controls how {dd} is printed).
If it helps, the actual body of the macro can easily be a call to Lua so it's
fine if the function takes 5 params where 4 and 5 can be nil or empty strings.
I've trawled through syst-aux.mkiv but it only covers optional numbers of [ ]
or { } but not combinations of both (which given the vast numbers of
combinations is perhaps not surprising!). Have I missed something obvious that
would help me?
Regards,
—
Bruce Horrocks
Hampshire, UK
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