[NTG-context] Why does \doifsomething think there is content?

Aditya Mahajan adityam at umich.edu
Sun Jan 15 18:51:56 CET 2023

On Sun, 15 Jan 2023, Joel via ntg-context wrote:

> I am creating a book that presents readers with a list of recommended materials.
> If materials are listed, then its displayed under the \subject{Materials} heading in a simple itemized list.
> I'm using \doifsomething{} to check if any items are listed.

Try \doiftext which typesets the material and checks its width.

> The problem I'm having is, when fed a blank macro, `\define\needsoven{}` it thinks there is content, so it displays the "Materials" heading, but an empty list. I have a custom macro that determins "if oven is needed" independent of these other items. So I need  `\define\needsoven{}` to be regarded as nothing.

\define\needsoven makes \needsoven non-expandable. You either need \defineexpandable\needsoven or use \doiftext


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