It's a shame that the intersection operator doesn't follow the rule of sets.
The intersection of the empty set with another set should be the empty set. So this should work: <$list filter="[all[current]!tag[Reaction]!has[a-actions]has[m-components]]+[!isblank[]list[!!m-components]count[]compare:number:eq[1]]" emptyMessage="NO ICON"> ICON 1 </$list> But it doesn't. It always wants to generate whatever happens after the + even though nothing that is generated following the + matches the first set. So instead you have to break it out into two list widgets: <$list filter="[all[current]!tag[Reaction]!has[a-actions]has[m-components]]" > <$list filter="[list[!!m-components]count[]compare:number:eq[1]]"> ICON 2 </$list> </$list> HTH On Wednesday, August 5, 2020 at 11:17:29 AM UTC-7, Mark Green wrote: > > Here's what I want to write in a filter: > > If the current tiddler > - doesn't have the "reaction" tag > - doesn't have an "a-actions" field > - has a "m-components" list with one member > - then display an extra icon. > > I originally wrote this as > > > [all[current]!tag[Reaction]!has[a-actions]list[!!m-components]count[]compare:number:eq[1]] > > But this does not work because list[] ignores its input, so even if it's > been emptied out by the earlier filters, it still displays the icon if > m-components has one member but the tiddler *does* have Reaction or > a-actions. > > I then tried using a set intersection: > > > [all[current]!tag[Reaction]!has[a-actions]]+[list[!!m-components]count[]compare:number:eq[1]] > > But this has the same problem and I'm not sure why, as the first set > should be empty. In fact looking at it if it's a set intersection, my > reasoning would have been that it would *never* trigger because the > second set can only be empty or contain "1", and so unless the tiddler was > named "1" that would not be present in the first set and the intersection > would be empty. But it seems intersections don't work that way? > > How do intersections correctly work and how can I do this? > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/da2df29e-ef67-4dee-acc1-0986eaa4127ao%40googlegroups.com.
