Hi Erwan,
I have a solution, but not a very elegant one :
\define myFilter()
a$(param)$ +[removesuffix[a]]
\end
<$set name="v" filter=<<myFilter>> value="default" emptyValue=<<param>>>
<$text text=<<v>>/>
</$set>
<$set name="param" value="myValue">
<$set name="v" filter=<<myFilter>> value="default" emptyValue=<<param>>>
<$text text=<<v>>/>
</$set></$set>
FrD
Le dimanche 25 octobre 2015 15:46:49 UTC+1, Erwan a écrit :
>
> Hi again everyone,
>
> use case: I want to build MyTemplate which shows a link to the current
> tiddler, with the text of the link being either a specific value given
> as parameter, or "title" by default.
>
> So I'm trying to assign a variable "v" with the value of variable
> "param" if "param" is defined, or some default value otherwise. I tried
> this:
>
> <$set name="param" value="myvalue">
> <$set name="v" filter="[<param>]" emptyValue="default">
> <$text text=<<v>>>
> </$set>
> </$set>
>
> but it doesn't work. I also tried various combinations like:
>
> <$set name="v" filter="[<param>]" value=<<param>> emptyValue="default">
>
> but that would assign either "myvalue" or nothing instead of
> "default"... I'm confused.
>
> I guess another way to phrase the question is: how can I check whether a
> variable has a value or not?
>
> Regards
> Erwan
>
>
>
>
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