Feature request: combining multiple RRULEs

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
ruby
Domain
backend

Research direction

The issue names no files, tests, or entry points. Start by locating the library's RRULE parsing and expansion API, then examine how enumerators are built; done means multiple RRULE properties can be combined while yielding distinct timestamps, with coverage for the payroll example.

Written by the indexing model from the issue text.

Description

Many calendar implementations support multiple RRULE properties. This is so that repetition rules that aren't possible to specify with one RRULE can be applied to an event.

For example, consider "Payroll is due twice a month, on the last weekday on or before the 15th and on the last weekday of the month".

A set of RRULE properties would look like this:

RRULE:FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYMONTHDAY=13,14,15;BYSETPOS=-1
RRULE:FREQ=MONTHLY;BYDAY=MO,TU,WE,TH,FR;BYSETPOS=-1

It would be awesome if the library supported combining multiple RRULE properties and returning a enumerator with the distinct timestamps generated by them. (One way to do this could be through operators that can add and subtract.)

Dominant language
Ruby
Stars
186
Forks
26
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