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# ical/fs todo
## Next
- **rsvp**. `partstat` is not yet in the tree. It should be writable, and
the write should be the whole user interface: `echo ACCEPTED
>/mnt/pim/events/uuid/<uid>/partstat`. Transport stays inside the server --
iMIP mail via `upas/marshal` for the ics backend, a JMAP method call
for `jmap/fs`. `pim/rsvp` writes the file and knows nothing else.
- **plumb port for alarms**, following `seemail`. The blocking `alarm`
file is one-to-one; a plumb port gives fan-out so `pim/alertcat`, a
bell and a logger can all see the same alarm.
- **`pim/next`** -- print the next event, one line, for a window label.
- **the slug is lossy**. `Go Home LTD & Kissinger -> API` becomes
`Go-Home-LTD-_-Kissinger--_-API`; every non-alphanumeric collapses to
`_`, so names are ugly and not reversible. The summary is intact inside
the file, but the filename could be kinder.
- **`pim/free`** -- free/busy over a range.
- **plumb rules** -- click a date, `agenda` opens that day.
## Backends
- `jmap/fs` against Fastmail. JSCalendar is JSON, so no parser; the work
is OAuth2 and the method surface. No Go library implements JMAP
calendars -- `rockorager/go-jmap` is core+mail only.
- `caldav/fs` via `emersion/go-webdav`. Untested on plan9, but its
transport is `net/http`, which is verified working.
## Known gaps
- Absolute VALARM triggers (`TRIGGER;VALUE=DATE-TIME`) are ignored; only
relative ones fire. `RELATED=END`, `DURATION`+`REPEAT` unhandled.
Note Google's `basic.ics` exports **no VALARM at all**, so alarms need a
backend that carries them.
- Embedded `VTIMEZONE` definitions are ignored. `TZID=` is resolved by
IANA name through Go's `time/tzdata` instead, which is correct for
Google (`America/New_York`) but will fail on a server that emits
Windows-style zone names or a zone not in the IANA database.
- Only `STATUS:CANCELLED` cancels an occurrence. `METHOD:CANCEL` is not
handled.
- The whole tree is rebuilt on refresh. Fine at this size, not forever.
- Directory listing order from go9p is non-deterministic (it iterates a
map to build the child list). `ls` sorts, so it does not show, but do
not depend on order.
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