From: Bruce Horrocks via ntg-context <ntg-context@ntg.nl>
To: ntg-context mailing list <ntg-context@ntg.nl>
Cc: Bruce Horrocks <ntg@scorecrow.com>
Subject: How to extend an existing macro to take optional parameters?
Date: Sun, 12 Mar 2023 13:24:51 +0000 [thread overview]
Message-ID: <FA67C545-4984-4545-B39F-AA931DEDD178@scorecrow.com> (raw)
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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next reply other threads:[~2023-03-12 13:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-12 13:24 Bruce Horrocks via ntg-context [this message]
2023-03-13 21:39 ` Hans Hagen via ntg-context
2023-03-14 2:08 ` Alan Braslau via ntg-context
2023-03-15 1:32 ` Bruce Horrocks via ntg-context
2023-03-15 1:27 ` Bruce Horrocks via ntg-context
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