This should do what you literally asked for ...
<$set name="my_tiddler" value="tiddler-X">
<$list filter="[tag[mytag]contains:my_tiddlers_list<my_tiddler>]" >
Tiddler <<currentTiddler>> has <<my_tiddler>> in field my_tiddlers_list
<br/>
</$list>
</$set>
Aside:
Some filter operators filter an existing title list. Others generate lists
without input. Filter operator "list" and "title" are in the latter
category.
On Saturday, October 16, 2021 at 10:35:00 AM UTC-7 CarloGgi wrote:
> it turns out that in any filter written as
>
> filter="[[whatever_selection_here]title[xyzxyz]]"
>
> all the selection preceding the step with tiddler's title is dropped and
> only that title is retained and passed on to the next step -if there is
> any. (And this wheter any xyzxyz tiddler exists or not by the way).
>
> so for example
>
> filter="[tag[bar]title[foo]]"
>
> outputs foo, even if tiddler foo has no 'bar' tag at all, and even if
> tiddler foo doesn't exist. This explains the apparently strange behavior
> above, and it is also quite counter-intuitive (one would intuitively expect
> the filter to output all the tiddlers -zero or one actually- that match
> title 'foo' and are tagged 'bar') so this behavior would deserve to be
> highlighted strongly in the documentation IMHO.
>
> On Saturday, October 16, 2021 at 7:01:53 PM UTC+3 CarloGgi wrote:
>
>> with reference to my previous post, no need to say neither this code
>> works for the inner filter:
>> <$set name='my_tiddler' value='tiddler-X'>
>> ...
>> filter="[enlist{!!my_tiddlers_list}<my_tiddler>]">
>>
>> nor this:
>>
>> <$set name='my_tiddler' value='tiddler-X'>
>> ...
>> filter="[[enlist{!!my_tiddlers_list}]<my_tiddler>]">
>>
>> they both always output the value of <<my_tiddler>>, whether it was
>> included in my_tiddlers_list or not.
>>
>> On Saturday, October 16, 2021 at 6:51:15 PM UTC+3 CarloGgi wrote:
>>
>>> Hallo again,
>>> I have some tiddlers with a special field, call it 'my_tiddlers_list'
>>> that stores, not hard to guess, a list of other tiddlers. By 'list' I mean
>>> to say the result of an <$action-listops xxx subfilter> widget, which is
>>> indeed some 'collection' of items separated by whitespace. I don't know if
>>> that's a 'list' in the sense of a type of variable (does TW have any
>>> variable types after all? It seems it doesn't).
>>> Anyway, how do I go to check if a given tiddler 'tiddler-X' is included
>>> in the list of tiddlers stored into field 'my_tiddlers_list' of a[ny]
>>> tiddler? When I transclude the reference to 'my_tiddlers_list' as in
>>> {{!!my_tiddlers_list}}what i get is a unique 'string'. How do I split it up
>>> into its single member items? And once split the string into tokens (its
>>> member items), ho do I perform the comparison check?
>>>
>>> So far, I came up with this very beginner-level code (I'm sure there are
>>> more elegant, concise ways to write it, merging the two filters into a
>>> single one and getting rid of one of the <$list> cycles) that tries to
>>> exploit 'enlist' operator. I leave some parts as 'pseudocode' because I
>>> don't know how to write them:
>>>
>>> <$set name='my_tiddler' value='tiddler-X'>
>>>
>>> <$list filter="[tag[mytag]has:field[my_tiddlers_list]]" >
>>> <$list
>>> filter="[enlist{!!my_tiddlers_list}canIDoTheComparisonHere?]">
>>> orShallICompareHere? AndIfSo,How?
>>> </$list>
>>> </$list>
>>>
>>> </$set>
>>>
>>> but have no clue if I'm going the right way and how to do the comparison
>>> check.
>>>
>>> Writing inner filter as filter="[enlist{!!my_tiddlers_list}[tiddler-X]]"
>>> doesn't work, nor does it work writing it as
>>> filter="[[enlist{!!my_tiddlers_list}][tiddler-X]]". In both cases I get
>>> <<currentTiddler>> valued as tiddler-X, regardless if it is included in
>>> my_tiddlers_list's list or not. For God's sake: why? And how do I write the
>>> check?
>>>
>>> Thanks for helping,
>>> CG
>>>
>>
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