I am writing a macro with three parameters. If omitted, the third shall be
equal to the first one. This cannot be hardwired of course! So I need to
code it. With a filter.
As far as I have seen, only the "regexp" filter can be used.
Here is my code. I try to replace "excluding" argument by "rejecting"
variable in order to get things done. The "NO" and "YES" are juste here to
help going quick with the results.
\define itemlist2(tag:"thème", field:"theme", excluding)
<$set name="rejecting" filter="[$excluding$]+[regexp[^.]then[YES
$excluding$]else[NO $tag$]]">
tag=$tag$, field=$field$, excluding=$excluding$,
rejecting=<<rejecting>>.<br>
</$set>
\end
In a tiddler named "choix des critères du thème 5" I have the following
code:
<$set name=beg value="choix des critères du ">
<$set name=theme2 filter="[{!!title}removeprefix<beg>]">
<$wikify name=theme text=<<theme2>>>
<$macrocall $name=itemlist2 tag=<<theme-label>> field=criterion
excluding=<<theme>>/>
</$wikify></$wikify>
</$set></$set>
and I get
tag=tableaux, field=criterion, excluding=thème 5, rejecting=NO tableaux.
instead of
tag=tableaux, field=criterion, excluding=thème 5, rejecting=YES thème 5
Note as a side question that I had to use theme2 and theme to get the pure
text "thème 5" because theme2 would be a link!!! Why so ???
I have tried other regexp in my code, with eventually a negative logic. At
first, I would have thought that
regexp[^$]
would target only an empty string. but the overall result is the same. In
fact, my problem is really a problem of filtering empty strings.
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