Hi Andrew,
I was wondering if you might know how to use the double bars || to declare
> in a macro something like...
If you mean the {{||some-template}} syntax you can sure use that in a
macro, e.g.
\define some-macro(x,y)
<$list filter="[all[current]has[$x$]]">
{{$x$||some-template}}
</$list>
<$list filter="[all[current]!has[$x$]]">
{{$y$||some-template}}
</$list>
\end
The thing with this is:
I want to set the value of $c$ to the value of $a$ if $s$ is null or empty.
...so long as I have trouble understanding what you're eventually trying to
achieve,
it is difficult to evaluate whether using a dynamically defined variable
"$c$" makes sense and how.
You see, I would not use "$s$" as a parameter if it was a field.
Also, how to you mean "set $c$" ...for which context?
Where is $c$ and its value to take effect?
Let me explain...
\define some-macro(some-tiddler,some-field,some-variable,some-value)
<$list filter="[<$some-tiddler$>has[$some-field$]">
<$set name="""$some-variable$""" value="$some-value$""">
what you actually want to do needs to be here, inside the $set, e.g.
{{||some-template}}
</$set>
</$list>
\end
...what in all of the above actually needs to be a paramater and what
doesn't or why, I would not know.
I would encourage you to follow slightly more specific goals that achieve
something tangible that you're after. Exploring all that is possible sure
is a good exercise and fruitful. However, on an as abstract level as this,
it is hard to imagine anything, to decipher what you're going for, because
the why and what is a wee blurry... unless you're that kind of artist that
just swings that brush and sees what comes out of it all later. :D
Best wishes,
— tb
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