Command-line and Emacs Calendar Client
1- [x] list/search events
2- [x] add/remove events
3- [x] edit events
4- [x] timezones
5- [ ] really stress test the timezone handling -- this is full of gotcha's
6- [ ] don't load all calendars into memory to show only one event
7- [ ] support specifying duration
8- [ ] diagnose events failing to parse
9 - [[https://github.com/robur-coop/icalendar/issues/14]]
10- [ ] [[https://github.com/robur-coop/icalendar/pull/13][handle RECURRENCE-ID]]
11- [ ] [[https://github.com/robur-coop/icalendar/issues/15][RRULE with local datetime]]
12- [ ] CalDAV syncing
13 - Currently, you can use [[https://github.com/pimutils/vdirsyncer][vdirsyncer]]
14- [ ] support querying times as well as dates
15- [ ] custom date/time formatting
16- [ ] support querying regex
17- [ ] support VTIMEZONE
18- [ ] support VALARMS
19- [ ] support VOTODS
20- [ ] support VCARDS
21- [ ] server mode
22 - and maybe hold =Event='s in-memory in a =Collection= instead of parsing them for every =Query=
23- [ ] implement TUI front end with something like [[https://github.com/leostera/minttea][minttea]]
24- [ ] implement an emacs client like mu4e
25- [ ] parallel queries
26- [ ] remove collection module
27 - ref [[https://github.com/ocaml-ppx/ppxlib/issues/481]] cc patrick