Hi
I don't know the reasons for the specific choice of output -- it seems,
however, that a more useful logic would have been:
"[has[F]]" -- those input tiddlers in which field F exists
"[!has[F]" -- those input tiddlers in which field F does not exist or has
an empty value
In which case "[has[F]] -[!has[F]]" -- would return those tiddlers with a
non-empty value for field F (the original output of "[has[F]]")
In the case that this introduces backward compatibility issues -- a suffix
option could be added for the has[] operator -- for any suffix:
i.e. "[has[F]]" -- those input tiddlers in which field F has a non-empty
value
"has:suffix[F]]" -- those input tiddlers in which field F exists
"[!has[F]]" -- those input tiddlers in which field F does not exist
or has an empty value
"[!has:suffix[F]" -- those input tiddlers in which field F does not
exist
regards
On Tuesday, 10 November 2015 20:02:29 UTC+2, Jeremy Ruston wrote:
>
> Hi Tobias
>
> It’s too late to change the semantics of the existing operator, but I’d
> certainly be interested in backwards compatible ways of addressing the
> problem in the original post.
>
> Best wishes
>
> Jeremy
>
>
> Best wishes,
>
> — tb
>
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