Re: [NTG-context] Why does \doifsomething think there is content?
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
Aditya
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[NTG-context] Why does \doifsomething think there is content?
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.
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.
How can I get \doifsomething{} to think \define\needsoven{} is an empty value?
--Joel
My minimal working example is below:
\define\needsoven{}
\define[1]\materialsneeded{%
\doifsomething{#1}{
\subject{Materials}
\startitemize
#1
\stopitemize
}
}
\starttext
\chapter{Recipe 1}
\materialsneeded{\needsoven}
\subject{Instructions}
Spread peanut butter on sandwich.
\chapter{Recipe 2}
\materialsneeded{\item pizza cutter \item stove}
\subject{Instructions}
Preheat oven to 450 degrees F.
\stoptext
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