If you can call the filter as a macro, or call a macro to make the filter,
then this works:
\define compare(foo,bar)
<$list filter="[title[$foo$]regexp[^$bar$$]]" emptyMessage="no match">
Matches!
</$list>
\end
<<compare "stuff" "stuff">>
It needs to be set up as a macro so it can use regexp[^$bar$$] (or
regexp[^$(bar)$$] if passed as an environmental variable.
What I don't understand, is why THIS doesn't work:
<$vars foo="stuff" bar="stuff">
<$list filter="[title<foo>field:title<bar>]" >
Matches!
</$list>
</$vars>
I've looked over the spec.s for the field operator. It should select an
input title if an only it matches it's parameter. And the title operator
should generate a tiddler title to be matched. But it doesn't seem to work
that way. Instead, the field:title only returns the input title if the
input title actually exists as a tiddler. But the spec's don't say that.
Good luck!
Mark
On Sunday, August 27, 2017 at 12:45:22 PM UTC-7, Mat wrote:
>
> I often want to test if e.g a field or variable has a certain value. How
> do I best do this in a filter?
>
> [{foo!!bar}EQUALS[frotz]]
>
> ...what is "EQUALS" ?
>
> <:-)
>
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