[help-texinfo] Determine if an argument was supplied to a macro

[Pantxo Diribarne]

Hello,

I'd like to define my own wrappers around @*ref macros so that they display differently for plaintext outputs (don't want to see "Note..." in a static text string).

My problem is to determine if a specific argument, among the 5 possible ones, has been supplied or not.

If I assume the first arg is always supplied and only want to display this one, this would be

@macro  myxref{arg1, arg2, arg3, arg4, arg5} 

@ifplaintext

\arg1\

@end ifplaintext

@ifnotplaintext

xref{\arg1\, \arg2\, \arg3\, \arg4\, \arg5\}

@end ifnotplaintext

@end macro

Now how would I go if I want to display the third argument in case it's supplied and the first in case arg3 is empty?

Thanks,

Pantxo