[NTG-context] number of chapters

[Taco Hoekwater]

> On 20 Jul 2022, at 09:40, Henning Hraban Ramm via ntg-context <ntg-context at ntg.nl> wrote:
> 
> Am 20.07.22 um 09:06 schrieb Henning Hraban Ramm via ntg-context:
>> Hi,
>> how do I access the current chapter number and the number of chapters (including appendixes; after the first run)?
>> I’d like to setup a chapter color like
>> \definecolor[ChapterColor][
>>   s=1,v=1,
>>   h=360*\namedstructurevariable{chapter}{number}/\numberofchapters,
>> ]
>> and use it for a thumb index...
>> (I can’t access the wiki ATM; downforeveryoneorjustme.com says it would be just me.)
> 
> Ok, I can access the wiki via Tor and found
> 
> \somenamedheadnumber{chapter}{current}
> \somenamedheadnumber{chapter}{last}

These are expandable

> 
> or
> 
> \someheadnumber[chapter][current]
> \someheadnumber[chapter][last]

These are not
> 
> What’s the difference?
> 
> And even if I use \definecolor within a setup, I get the same color for every chapter – how and where must I delay expansion?
> 
> \usemodule[visual]
> 
> \startsetups[MyChapterSetup]
> \definecolor[MyChapterColor][h={360*\somenamedheadnumber{chapter}{current}/\somenamedheadnumber{chapter}{last}},s=1,v=1]

\definecolor[MyChapterColor][h={\the\numexpr 360*\somenamedheadnumber{chapter}{current}/\somenamedheadnumber{chapter}{last}\relax},s=1,v=1]

Best wishes,
Taco

— 
Taco Hoekwater              E: taco at bittext.nl
genderfluid (all pronouns)