Katherine Meerburg

It looks like Tana does support more than simple fixed values via the "formula" method @Julien France pointed out; I did a bit more poking and was able to get some more out of it:

https://ktemk.in/post/tana-formulae/

Things formulas can do, from what I'm looking at, while live updating:

• Use field values given anything you can craft a search query for (using e.g findInstance, filter, and lookup)
• Use field values for a particular field in parent/child nodes
• Use field values on any node that is used itself as a field value
• Basic math (add, subtract, multiply, divide, average, min, max, count, rounding) on node contents / field values
• Filter out duplicate references
• Parse and format dates, to a degree
• Get the first and last N items returned by a search
• Combine disparate searches
• Move up and down the parent/child tree
• Count the length of a string or the number of emojis in it (???)

... and that's about it. There doesn't seem to be a way to get a substring, or choose based on conditions, or anything like that.

edit: now, if there was the ability to specify an arbitrary javascript function to run instead of these preselected few, that would be