Very nice solution Eric! One question:
Best wishes Mohammad On Mon, Aug 2, 2021 at 6:02 AM Eric Shulman <[email protected]> wrote: > On Sunday, August 1, 2021 at 9:48:12 AM UTC-7 Atronoush wrote: > >> I am sure this has been addressed before but I cannot find it in forum >> Assume you have a complex filter that results in an output containing few >> tiddlers. Then you want to show them with a delimiter e.g. pipe (|) >> One solution is below. I am looking for a more efficient solution! I >> assume here TW makes the search two times! I know we can use a $set widget >> here, but what better solution do you propose? >> > > Overall, an interesting challenge in TiddlyWiki filtering. > I had fun trying several approaches... > > The most efficient one is to use $set, as you suggested, like this: > <$set name="out" filter="[tag[HelloThere]] [tag[About]] [tag[Platforms]]"> > <$list filter="[enlist<out>butlast[]]"><$link/> | </$list> > <$list filter="[enlist<out>last[]] "><$link/> </$list> > </$set> > Is it possible to use *subfilter* instead of *enlist* here? Which is recommended? <$set name="out" filter="[tag[HelloThere]] [tag[About]] [tag[Platforms]]"> <$list filter="[subfilter<out>butlast[]]"><$link/> | </$list> <$list filter="[subfilter<out>last[]] "><$link/> </$list> </$set> > The improvement is that the filter is only evaluated once, with two > enlist[] operators added. Depending upon how many matching tiddlers are > found, and assuming a reasonably short list, the enlist[] operators are > likely to be more efficient than evaluating the filter twice. Also, note > the use of -[last[]] in your initial post is incorrect... it doesn't > actually remove the final item. The correct operator to use is butlast[], > as shown above. > > I also tried this: > <$set name=out filter="[tag[HelloThere]] [tag[About]] [tag[Platforms]]"> > <$vars last={{{ [enlist<out>last[]] }}}> > <$list filter="[enlist<out>]"><$link/> <$text text={{{ > [<currentTiddler>!match<last>then[|]] }}}/> </$list> > </$vars> > </$set> > The improvement here is the same as above, except that uses an extra > variable ("last") and an inline filter to decide when to insert the "|" > between items, so it's obviously a bit less efficient. > > Lastly, I tried this: > <$vars lb="[[" rb="]]"> > <$set name=out filter="[tag[HelloThere]] [tag[About]] [tag[Platforms]]"> > <$wikify name="out" text="""<$list > filter="[enlist<out>addprefix<lb>addsuffix<rb>join[ | ]trim[ | ]]" > ><$link/></$list>"""> > <<out>> > </$wikify> > </$set> > </$vars> > Of course, this is even less efficient than the previous solutions, as it > uses wikify to produce the output, and needs to explicitly add brackets > around the links. However, it does demonstrate the use of join[] and > trim[] to insert the "|" between items. > > -e > >> -- > 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/b1fc22c4-d4e7-4f45-a26a-7f0757618dd2n%40googlegroups.com > <https://groups.google.com/d/msgid/tiddlywiki/b1fc22c4-d4e7-4f45-a26a-7f0757618dd2n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CAAV1gMAxudxUB%2BQ2vfv3K1hcacPumDrSj3KiFZ0HBgrBPMRtvQ%40mail.gmail.com.
