Change currentTiddler within macro based on macro input

[David Allen]

I do not want a new plugin, so please don't suggest one!

I have a macro as follows:

\define img_gallery2(target_tiddler)

<div style="width: 33%; float: right;">

<<single_image3>>

<<add_gallery2>>

</div>

\end

Right now, target_tiddler is not used.  single_image3 and add_gallery2 both use text references for the currentTiddler variable (such as {{!!images}} ).

I want to expand this macro to set currentTiddler to the value of target_tiddler only if target_tiddler is defined, but leave it alone otherwise.

Anyone have any suggestions?

I do not want a new plugin, so please don't suggest one!

[bimlas]

David Allen,

I think you need to use the Tiddler widget (https://tiddlywiki.com/#TiddlerWidget):

\define img_gallery2(target_tiddler)
  <$tiddler tiddler=<<__target_tiddler__>>>

    <div style="width: 33%; float: right;">
      <<single_image3>>
      <<add_gallery2>>
    <

/div>
  </$tiddler>
\end

[Mark S.]

Try

\define img_gallery2(target_tiddler)
<$list filter="[<__target_tiddler__>!is[missing]] ~[title<currentTiddler>]">

<div style="width: 33%; float: right;">
<<single_image3>>
<<add_gallery2>>
<

/div>
</$list>
\end

[David Allen]

Thank you! This is working now.  I didn't know the exact syntax for doing <<__parameter__>> inside a filter, so that helped.

Also, why is the ~ in front of the title<currentTiddler> again?

[Mark S.]

On Saturday, December 21, 2019 at 12:27:36 PM UTC-8, David Allen wrote:

Also, why is the ~ in front of the title<currentTiddler> again?

That means "else". So if the first run doesn't find the target tiddler, the second run will use the current tiddler.