Re: [NTG-context] Is there a way to centrally add a list of indexed items to a sub category?

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

On 5/15/2023 3:37 AM, Joel via ntg-context wrote:
> 
> I have a document like this:
> 
>      \starttext
>          \index{dogs}
> 
>          \index{cats}
> 
>          \index{flowers}
> 
>          \index{snails}
> 
>          \index{trees}
> 
>          \placeindex
> 
>      \stoptext
> 
> As I understand, if you use \index{animals+dogs}, it will place dogs as 
> a sub-category of dogs.
> 
> Is there any way to control this centrally, for instance:
> 
> \addtosub[animals]{dogs, cats, snails}
> \addtosub[plants]{flowers, trees}
> 
> Such a way would make it so \index{dogs} places an entry for "dog" under 
> "d" and "animals --> dogs" under "a".
\starttexdefinition protected IndexA#1#2
     \index{#2}
     \doloopoverlist {#1} {
         \index{##1+#2}
     }
\stoptexdefinition

\starttexdefinition tolerant protected IndexB[#1]#:#*#2
     \index{#2}
     \doloopoverlist {#1} {
         \index{##1+#2}
     }
\stoptexdefinition

\starttext
     a\IndexA{animals}{dogs}
     a\IndexA{animals}{cats}
     a\IndexA{plants}{flowers}
     a\IndexA{animals,small}{snails}
     a\IndexA{plants,huge}{trees}
     \page
     b\IndexB[animals]      {dogs}
     b\IndexB[animals]      {cats}
     b\IndexB[plants]       {flowers}
     b\IndexB[animals,small]{snails}
     b\IndexB[plants,huge]  {trees}
     \page
     c\IndexB{dogs}
     c\IndexB{cats}
     c\IndexB{flowers}
     c\IndexB{snails}
     c\IndexB{trees}
     \page
     \placeindex
\stoptext



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