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# SilverBullet iCalendar Plug
`silverbullet-icalendar` is a [Plug](https://silverbullet.md/Plugs) for [SilverBullet](https://silverbullet.md/) which I made for my girlfriend.
It reads external [iCalendar](https://en.wikipedia.org/wiki/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](https://silverbullet.md/Space%20Config), short example:
```yaml
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](https://help.nextcloud.com/t/how-to-access-the-calendar-ics-file-via-url/7880)):
- 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](https://support.google.com/calendar/answer/37648?hl=en#zippy=%2Cget-your-calendar-view-only)):
- 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
![Screenshot of getting the URL from Nextcloud Calendar](./url-nextcloud.png)
## 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:
```md
${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