Hi Jeremy,
Your example of a count filter operator is exactly what I'm looking for!
Looks like I'll just have to make do without this for now. Although I'm
excited to see that you're considering adding this. I'm assuming there must
be other cases that a count operator would be useful.
On Sunday, February 5, 2017 at 2:26:21 PM UTC-6, Jeremy Ruston wrote:
>
> Hi Jeff, Jed,
>
> > Is it possible to get the size of a list filter into a variable?
>
> Not currently, no. There’s an enhancement already in the 5.1.14 prerelease
> that provides part of the answer: filtered transcluded attributes. These
> are attributes that return the first entry of a filtered list. For example:
>
> <div data-my-value={{{ [<currentTiddler>get[document]] }}}>
> …
>
> The other part is that we need a “count” filter operator (at the moment,
> there’s only a count widget. The count filter operator would allow one to
> do things like:
>
> <table colspan={{{ [tag[special]count[]] }}}>
> …
>
> I think it’s worth adding a “count” filter; I’ve also come across cases
> where it would be useful.
>
> > The problem is that the list widget does everything. Almost every
> component of tiddlywiki that is displayed is displayed inside a list
> widget, from the order of the tiddlers in the story river to the buttons on
> each tiddler. Unfortunately this means that anything you do to the list
> widget has unintended consequences. a while ago Tobias made a modification
> to the list widget that would give you the index of the current item of the
> list. It was very useful, unfortunately it turns out that it also
> interferes with some of the optimisations needed to make tiddlywiki run
> reasonably.
>
> To clarify, Jed’s referring to the fact that we can’t extend the list
> widget to provide a variable with the count of the number of entries
> because it is optimised to re-use the widget and DOM trees of list entries
> through the insertion and deletion of entries.
>
> > Recently there has been some more discussion about this and I think that
> the current consensus is that we should just make another widget that does
> what the list widget does but without the optimisation so we can include
> things like giving a count of the number of things in a list. I think
> someone said they would work on it but I don't know if any progress has
> been made.
>
> Good idea. We need a name for the new widget; perhaps “repeat” or “loop”?
> (Possibly best discussed via a GitHub ticket, if there isn’t one already)
>
> Best wishes
>
> Jeremy.
>
>
>
> On 5 Feb 2017, at 20:09, Jed Carty <[email protected] <javascript:>>
> wrote:
>
> The problem is that the list widget does everything. Almost every
> component of tiddlywiki that is displayed is displayed inside a list
> widget, from the order of the tiddlers in the story river to the buttons on
> each tiddler. Unfortunately this means that anything you do to the list
> widget has unintended consequences. a while ago Tobias made a modification
> to the list widget that would give you the index of the current item of the
> list. It was very useful, unfortunately it turns out that it also
> interferes with some of the optimisations needed to make tiddlywiki run
> reasonably.
>
> Recently there has been some more discussion about this and I think that
> the current consensus is that we should just make another widget that does
> what the list widget does but without the optimisation so we can include
> things like giving a count of the number of things in a list. I think
> someone said they would work on it but I don't know if any progress has
> been made.
>
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