[tw] Useful macro to build and display/act-on a "linked-list" of tiddlers
(too old to reply)
Diego Mesa
2018-02-12 18:14:42 UTC
Raw Message
Hey all,

While working on my Spaced Repetition/Anki system, I've developed this
general link-list macro which might be useful. Its purpose is to take a
subfilter, eg: "tag[Flash Card]", sort them someway, eg: created, an ending
link (eg: "Results"), and create a series of links from one tiddler to the
next, all the way to the end. The "next" tiddler in the link is saved in a
field, whose name you can also specify.

Right now, it also has the list navigation built in (action-navigate),
though Im sure we can just add an additional actions parameter to this
macro in the future.

\define createAndShowLinkedList(subfilter lastlink sortby:created
<!-- for the n many cards, we return n-1 -->
<$formula-vars counter="count([$subfilter$])-1">
<!-- iter goes from 0 to n-2 -->
<$list filter="[range<counter>butlast[]]" variable="iter">
<!-- arrays need to be accessed from 1 to n -->
<$formula-vars current="nth([$subfilter$sort[$sortby$]], <<iter>> +
1)" next="nth([$subfilter$sort[$sortby$]], <<iter>> + 2)">
<$action-setfield $tiddler=<<current>> $field=$linkfieldname$
<!--<Current: <<current>>, Next: <<next>> <br/> -->
<!-- take last element with no forward link -->
<$list filter="[range<counter>last[]]" variable="iter">
<$formula-vars current="nth([$subfilter$sort[$sortby$]], <<iter>> +
<$action-setfield $tiddler=<<current>> $field=$linkfieldname$

<!-- begin list navigation -->
<$list filter="[$subfilter$sort[$sortby$]first[]]">
<$action-navigate $to=<<currentTiddler>>/>

It currently uses Evan's excellent formula plugin. I'm pretty sure someone
could do all of the counting, adding, etc without it, but Im not sure how
to get the *range* using just core features. I was thinking of trying to
make this my first core PR, but I couldnt see a way around the use of range.

If anyone has any feedback, critcisms, etc please let me know!

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 tiddlywiki+***@googlegroups.com.
To post to this group, send email to ***@googlegroups.com.
Visit this group at https://groups.google.com/group/tiddlywiki.
To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/776d405c-c5e3-46a1-8318-1eb41cc2f623%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.