> On 2 Nov 2024, at 20:02, Joel via ntg-context <ntg-context@ntg.nl> wrote:
>
> Suppose I have a macro like this:
>
>
> \define[1]\thisismylist{
>
> This list has n items.
>
> \startitemize
> #1
> \stopitemize
>
> }
>
> And in the document it might have this:
>
> \thisismylist{
> \item cat
> \item dog
> \item tree
> }
>
> How can I make n display three, as there are three items?
>
> "This list has 3 items:
>
> 1. cat
> 2. dog
> 3. tree
>
> I will use this as a means to check if the description before a list needs a
> plural or not:
>
> Read the prompts below:
>
> - Do you think cats should be banned from university dormitories?
> - Should public schools provide free breakfast?
>
> And that way, if there is only one prompt, it changes the instructions to be:
>
> Read the prompt below:
>
> - Do you think cats should be banned from university dormitories?
If your actual items are more complex than those in your example and Wolfgang’s
suggestion of iterating over a comma separated list won’t work then ...
The following code stores the length of each list in a dataset. The `delay`
option ensures the values retrieved are those from the completed run of the
document, and a unique id is assigned to each list so subsequent lists don’t
overwrite the length calculations for earlier ones.
\definecounter [MyItemsCounter]
\definecounter [MyItemsUniqueID] [way=bytext]
\setcounter [MyItemsUniqueID] [1]
\definedataset [MyItems] [delay=yes]
\defineitemgroup [MyItems]
\setupitemgroup [MyItems]
[ before={\setcounter[MyItemsCounter][1]},
inbetween={\incrementcounter[MyItemsCounter]},
after={\setdataset[MyItems][\rawcountervalue[MyItemsUniqueID]][count=\rawcountervalue[MyItemsCounter]]%
\incrementcounter[MyItemsUniqueID]},
]
\define\listLen{\datasetvariable{MyItems}{\rawcountervalue[MyItemsUniqueID]}{count}}
\define\itemOrItems{\doifelse{\datasetvariable{MyItems}{\rawcountervalue[MyItemsUniqueID]}{count}}{1}{item}{items}}
\starttext
This list has \listLen\ \itemOrItems.
\startMyItems
\item cat
\item dog
\item tree
\stopMyItems
\blank
This list has \listLen\ \itemOrItems.
\startMyItems
\item cow
\stopMyItems
\stoptext
Regards,
—
Bruce Horrocks
Hampshire, UK
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