Command-line and Emacs Calendar Client
1- [x] list/search events 2- [x] add/remove events 3- [x] edit events 4- [x] timezones 5- [x] remove collection module 6 - ref [[https://github.com/ocaml-ppx/ppxlib/issues/481]] cc patrick 7- [ ] allow editing recurrence-ids 8- [ ] don't load all calendars into memory to show only one event 9- [ ] support specifying duration 10- [ ] better add/edit event datetime parsing 11 - day of the week 12 - month names 13 - allow editting date or time without touching the other 14- [x] diagnose events failing to parse [[https://github.com/robur-coop/icalendar/issues/14]] 15- [x] [[https://github.com/robur-coop/icalendar/pull/13][handle RECURRENCE-ID]] 16- [x] [[https://github.com/robur-coop/icalendar/issues/15][RRULE with local datetime]] 17- [ ] CalDAV syncing 18 - Currently, you can use [[https://github.com/pimutils/vdirsyncer][vdirsyncer]] 19- [ ] support querying times as well as dates 20- [ ] custom date/time formatting 21- [ ] support querying regex 22- [ ] support VTIMEZONE 23- [ ] support VALARMS 24- [ ] support VOTODS 25- [ ] support VCARDS 26- [ ] server mode 27 - and maybe hold =Event='s in-memory instead of parsing them for every =Query= 28- [ ] implement TUI front end with something like [[https://github.com/leostera/minttea][minttea]] 29- [ ] implement an emacs front end, like mu4e to mu 30- [ ] parallel queries