silverbullet-icalendar is a Plug for SilverBullet which I made for my girlfriend. It reads external iCalendar data, also known as iCal and .ics format, used in CalDAV protocol.

Note: This version (0.2.0+) is compatible with SilverBullet v2 only. For SilverBullet v1, use version 0.1.0.

Installation

Run the {[Library: Install]} command and paste the following URL: https://github.com/Maarrk/silverbullet-icalendar/blob/main/PLUG.md

Alternatively, you can use the older way with the {[Plugs: Add]} command: ghr:Maarrk/silverbullet-icalendar

Then run the {[Plugs: Update]} command and off you go!

Configuration

This plug is configured with Space Config, short example:

icalendar:
  # where to get the iCalendar data from
  sources:
  - url: https://example.com/calendar.ics
    # this will be set as sourceName on all results from this source
    name: Example calendar

Instructions to get the source URL for some calendar services:

Nextcloud (source):
- Edit calendar (pencil icon to the right of the name)
- Share calendar link
- Details (three dots icon), copy subscription link
- Verify that the link ends with ?export
Google Calendar (source):
- Calendar settings (pencil icon to the right of the name)
- Settings and Sharing, scroll down to Integrate calendar
- Copy the link for Secret address in iCal format

Usage

After configuration, run the {[iCalendar: Sync]} command to synchronize calendar events. The plug will cache the results for 6 hours by default (configurable via cacheDuration in config).

To bypass the cache and force an immediate sync, use the {[iCalendar: Force Sync]} command.

To completely clear all indexed events and cache (useful for troubleshooting), use the {[iCalendar: Clear All Events]} command.

Events are indexed with the tag ical-event and can be queried using Lua Integrated Query (LIQ).

Examples

Select events that start on a given date:

```md
${query[[
  from index.tag "ical-event" 
  where start:startsWith "2024-01-04"
  select {summary=summary, description=description}
]]}
```

Get the next 5 upcoming events:

${query[[
  from index.tag "ical-event"
  where start > os.date("%Y-%m-%d")
  order by start
  limit 5
]]}


## Roadmap

- Cache the calendar according to `REFRESH-INTERVAL` or `X-PUBLISHED-TTL`
- More indexed object types:
  - `ical-todo` for `VTODO` components
  - `ical-calendar` showing information about configured calendars
- Support `file://` URL scheme (use an external script or filesystem instead of authentication on CalDAV)

## Contributing

Pull requests with short instructions for various calendar services are welcome.
If you find bugs, report them on the [issue tracker on GitHub](https://github.com/Maarrk/silverbullet-icalendar/issues).

### Building from source

To build this plug, you need [Deno](https://deno.land/) installed. Then, build the plug with:

```shell
deno task build
```

Or to watch for changes and rebuild automatically:

```shell
deno task watch
```

The compiled plug will be written to `icalendar.plug.js`. This file is tracked by Git in this repository to allow for easy installation via the `PLUG.md` file.

## License

MIT, following SilverBullet