I’m trying to create something like <$let var=foo.{{!!bar}}.car>... so that if bar’s value is xxx, then var will be foo.xxx.car. I’m not able to do it. The attribute value is the literal above. If I put quotes it still is the literal. So, what is the way to achieve this?
You need to use the “filtered transclusion” syntax to construct the desired value, like this:
<$let var={{{ [[foo]] [{!!bar}] [[car]] +[join[.]] }}}>
enjoy
-e
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This is kind of verbose… is there a slimmer way?
Also, I just used dots for this example, in my real use case I the text between text references is different.
You could also do this using the $wikify widget, like this:
<$wikify name="var" text="foo.{{!!bar}}.car">
-e
It’s best practice. the wikify widget should be the last resort if there is no other way.
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You can changed the parameter of join[] to any text you like, or use it like this
<$let var={{{ [[foo.]] [{!!bar}] [[.car]] +[join[]] }}}>
where you can change the periods to anything you like, independent of each other.
It is indeed verbose and hard to follow. There is a proposal for a shortcut syntax for textual substitution: Add support for string literal attributes with textual substitution · Issue #6663 · Jermolene/TiddlyWiki5 · GitHub
With that proposal, your example would be:
<$let var=`foo.${ [{!!bar}] }$.car`>
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