Hi Tobias
> I was wondering how difficult it might be to extend the set widget so as > to allow a default value as a fallback for when the value is actually > undefined: > The trouble is that in many situations an empty string is a valid value that shouldn't be defaulted; what we really want here is a way to detect missing parameters. \define tagging(title) <$set name="tid" value=$title$ default="<<currentTiddler>>"> <$list filter="[[<<tid>>]tagging[]]"/> \end This example wouldn't work for a title containing spaces. Bear in mind that macro parameters are processed with text substitution, so passing "Hello There" as a title gives you value=Hello There, which won't work as expected. The fix is to use quotes; triple quotes are recommended because that allows titles to contain single or double quotes. <$set name="tid" value="""$title$"""> Best wishes Jeremy. > > \define tagging(title) > <$set name="tid" value=$title$ default="<<currentTiddler>>"> > <$list filter="[[<<tid>>]tagging[]]"/> > \end > > I am not sure if that would help or be the correct syntax, the latter > mostly thanks to me not quite being able to decipher the documentation for > variables on tiddlywiki.com. > > Best wishes, Tobias. > -- Jeremy Ruston mailto:[email protected] -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/d/optout.
