[FEATURE REQUEST] Filtering of tasks according to boolean search terms

[wakatara]

Much like the taskpaper app does itself, would it be possible to implement a way of filtering tasks according to more complex search terms?

For example: @week(11) and not @done

This is the killer feature of Taskpaper in OSX (I find) and works well with the emacs version of Taskpaper.

I was thinking perhaps fzf could also be used for even rudimentary sorting, though of course, something which expanded to include search terms and boolean AND OR NOT would be incredible.

(and thank you for all your hard work on this plugin. It's much better than the other implementation of taskpaper I saw a couple years back. Well done!).