Select among three tiddlers with priority

[Mohammad]

How to select among three tiddlers in below priority?

- if tid1, tid2, and tid3 are existed then return tid1

-if tid2, and tid3 are existed return tid2

-if tid1 and tid2 are NOT existed then return tid3

Note the first two tiddlers come from a filter result and we don not know their name in advance like

• [tag[a]] for tid1
• [tag[b]] for tid2

I thought the below code may work, what do you propose?

<$list filter="[tag[a]] [tag[b]] +[limit[1]]" emptyMessage="tid3">
<<currentTiddler>>
</$list>

--Mohammad

[TonyM]

Mohammad,

Am I correct restating your requirement that "given three tiddlers select the first one you find?"

I would think this works, if not your own example

<$list filter="[tag[a]] [tag[b]] [[tid3]] +[limit[1]]">

<<currentTiddler>>
</$list>

Tony

[Mohammad]

Yes, seems your solution also works!

I am trying to use this for tiddler overloading like the one is found for shadow tiddlers!

So, tid2 is required to overload if tid1 exist! If none exist TW should use a default tiddler called tid3 here!

One use case:

1. Display a tiddler using template tid2 (the one tagged with b)
2. If user supplied its own template use user template here is tid1 (the one tagged with a)
3. If not supplied tid1 nor tid2 use a default template called tid3

--Mohammad 

[TonyM]

Mohammad,

The word is perhaps overiding rather than overloading.

There are a number way to do this that I use for this. I will share some.

Tony

[Xavier Cazin]

Hi Mohammad,

For your use case, here is a typical use of the ~ operator (aka "else") on filter runs :

<$list variable=template filter="[tag[a]] ~[tag[b]] ~[[tid3]]">
<$transclude mode=block tiddler=<<template>> />
</$list>

Best regards,

Xavier.

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[Mohammad]

Yep, this is a smart solution and more semantic than my solution!

Thanks Xavier!

--Mohammad

On Wednesday, December 4, 2019 at 1:12:22 PM UTC+3:30, Xavier wrote:

Hi Mohammad,

For your use case, here is a typical use of the ~ operator (aka "else") on filter runs :

<$list variable=template filter="[tag[a]] ~[tag[b]] ~[[tid3]]">
<$transclude mode=block tiddler=<<template>> />
</$list>

Best regards,

Xavier.

On Wed, Dec 4, 2019 at 8:02 AM Mohammad <mohamma...@gmail.com> wrote:

Yes, seems your solution also works!

I am trying to use this for tiddler overloading like the one is found for shadow tiddlers!

So, tid2 is required to overload if tid1 exist! If none exist TW should use a default tiddler called tid3 here!

One use case:

1. Display a tiddler using template tid2 (the one tagged with b)
2. If user supplied its own template use user template here is tid1 (the one tagged with a)
3. If not supplied tid1 nor tid2 use a default template called tid3

--Mohammad 

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