Improve integration with Task Widget (GNOME extension) - or resurrect the official GTG extension

[digitalethics]

Task Widget is a new extension to display tasks next to GNOME's calendar widget. Relevant issue raised with Task Widget to track progress on mutual integration if necessary.

[diegogangl]

AFAIK that extension uses Evolution Data Server, so we should have a backend for EDS to support it. Several Gnome apps including Calendar use it too, so we should implement it eventually.

[nekohayo]

I don't really know, but I'm not sure EDS actually supports the amount of complexity, metadata and features inherent in GTG & LibLarch's design for handling task dependencies and whatnot. Otherwise, I'd have thought the previous maintainers would have started with EDS from day one, back in 2009 (@ploum probably knows). My hunch is that this would be impossible without turning EDS' task management into GTG's.

[jmiskinis]

EDS stores its tasks as VTODO components of iCalendar media type. The specification allows the use of non-standard properties (e.g. X-GTG-TAGS) so in theory you should be able to store as much of custom metadata as desired. Task dependencies can be handled using the RELATED-TO property, RRULE stores data for recurrences. I'd say It's quite a robust format and EDS provides required methods to interact with it.

[bepolymathe]

Would be great...

[nekohayo]

Alternatively someone could resurrect/update https://github.com/getting-things-gnome/gtg-gnome-shell-extension too (see getting-things-gnome/gtg-gnome-shell-extension#11)... in any case, we need someone new to come forward and do this!