Yes, thank you Tobias for understanding and formalizing my idea!
Should we open an issue about that?
On 06/11/15 16:31, Tobias Beer wrote:
Hi Erwan,
Steve I think that your use case is interesting because it shows a
limitation of sorting with TW filters (although imho in this
specific case the best solution would be to sort the list of tags
automatically every time a tag is added to a tiddler).
I think TiddlyWiki should *never* sort a list-field when adding or
removing an item, unless specifically instructed to do so via
something like Matabele's listops, the tags field being just a special
case of a generic list-field.
I think another case with the same limitation is when one wants to
sort a list of tiddlers by the number of times they are used as
tags (i.e. number of tiddlers tagged with them).
...
I wonder if it would be possible to implement new "sort" filter
operators which would allow the usage of a sub-filter like this
This sounds to me that -- for the purposes of sorting -- we wish for
something like a "virtual field", by which we can sort after we've
created it "in-memory". A *sortby* filter could "sort by the output of
filter expression evaluated against an item". This filter expression
could be passed to the operand as either a variable or text reference
as we'd have no other way to chuck a "subfilter" within a filter
expression, e.g.
|
<$vars sortfilter="[<currentTiddler>tagging[]]">
<<list-links filter:"[all[]sortby<sortfilter>]">>
</$vars>
|
'The above should cater for the OP's requirement, assuming the
*sortby* filter would:
1. evaluate each item in the input set against the specified filter
in the operand
2. sort the items in the input set with respect to whatever was returned
It could / perhaps should even be...
|
<<list-links filter:"[all[]sortby:nsort<sortfilter>]">>
|
...to avail any core sorting algorithms.
The count would be:
|
<$vars sortfilter="[<currentTiddler>tagging[]count[]]">
<<list-links filter:"[all[]sortby<sortfilter>]">>
</$vars>
|
...requiring, well, a nonexisting "count" filter.
Best wishes,
Tobias.
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