[TW5] Question about the filter operator: list

[Alberto Molina]

Hi,

If I write the following in a new tiddler on tiddlywiki.com

<$list filter="[[HelloThere]tags[]]">
{{!!list}}
</$list>

I get, as expected, the contents of the list field of the tiddlers which are used as tags of [[HelloThere]]. In this case, its the contents of the list field of the tiddler [[introduction]].

But if I write:

<$list filter="[[HelloThere]tags[]list[]]"/>

I do not get the same results. The above code shows the contents of the list field of [[HelloThere]] instead of [[introduction]]. Why?

Am I wrong expecting the same results or is there something wrong in the code?

Alberto

[Jeremy Ruston]

Hi Alberto

The "list" filter operator replaces the current list with the content of the list field of its operand. See:

http://tiddlywiki.com/#FilterOperator%3A%20list

If the tiddler title is omitted from the operand then it defaults to the current tiddler.

Stephan has also pointed out that the semantics of the `list` operator are unexpected and not very useful. At this point I'd rather add improved filter operators and then deprecate 'list', rather than changing the existing implementation.

Best wishes

Jeremy

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[Alberto Molina]

Thanks Jeremy!

I saw http://tiddlywiki.com/#FilterOperator%3A%20list but didn’t understood.

Alberto

[Stephan Hradek]

Let's try again. Last time my post appeared twice and when deleting one, both were gone.

This is what I understood from the descreption.

Imagin your current filter came to the point where it had these tiddler names:

A B C D E F G

Now you have in your current tiddler a field called "list" containing

E F G H I J

list[] -> E F G  I J

!list[] -> A B C D

if  you have in the tiddler "Z" a field "mylist" containing A C E G you will get this

list[Z!!mylist] -> A C E G

!list[Z!!mylist] -> B D F

[Stephan Hradek]

@Jeremy

Am Sonntag, 15. Juni 2014 09:47:24 UTC+2 schrieb Jeremy Ruston:

Hi Alberto

The "list" filter operator replaces the current list with the content of the list field of its operand. See:

http://tiddlywiki.com/#FilterOperator%3A%20list

 
I have the feeling, the consistency is lost here.

To my understanding

[list[HelloThere!!mylist]]

Should be

[list{HelloThere!!mylist}]

While

[list[something somethingelse athirdthing]]


Should be the fixed list of the 3 elements listed.

So your example should be interpreted as  a list with one element named "HelloThere!!mylist".



[Jeremy Ruston]

Hi Stephan

> I have the feeling, the consistency is lost here.

The "list" operator was implemented back before the filter syntax allowed indirect operands.

As I said above, I agree that the `list` filter operator is broken. However we need to fix it by introducing a new filter operator, rather than breaking backwards compatibility of the existing operator.

Best wishes

Jeremy.

[Danielo Rodríguez]

Hello,

I hope it is ok to write in and old topic, but I think the title fits perfectly.

I would like to write this:

<$list filter="[list[!!related]]"> <$link>{{!!title}}</$link></$list>

in an easier form like this:

{{{[list[!!related]]}}

What is the problem? In the second option all the links appears together. There is no space between them. And that's the only problem. What about a new filter operand, or something else, that specifies how results should be separated?

[PMario]

On Friday, August 29, 2014 10:02:37 AM UTC+2, Danielo Rodríguez wrote:

in an easier form like this:

{{{[list[!!related]]}}

What is the problem? In the second option all the links appears together. There is no space between them. And that's the only problem. What about a new filter operand, or something else, that specifies how results should be separated?

imo you need to add a template
http://tiddlywiki.com/#Transclusion%20in%20WikiText

eg:
<ul>
{{{ [list[!!related]] || xview }}}
</ul>

xview

<li><$view field=title /></li>

The <ul> or <ol> tags are neded, to get a proper html structure for styling.
If you don't like to type much, create a macro that uses parameters for ol, ul, fieldname ....

have fun!
mario