Create 'private' feeds for free-busy info

[evert]

Many calendaring systems offer a 'private calendar' to publish freebusy information.

Instead of using the typical VFREEBUSY component, this feed is simply stripped of all private information and only keeps DTSTART/DTEND for every VEVENT and sets the SUMMARY to for example 'Busy'.

Even though this feature is non-standard, it would be nice to offer this.

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[Hywan]

With something like:

$document->makePrivate()

?

[evert]

@Hywan I think I would largely copy what FreeBusyGenerator has (or subclass) but simply change the output. The process would be mostly the same and any improvements FreeBusyGenerator gets in the future would also then apply to this new thing.

[Hywan]

Ok I see your approach.