Complete recurrence generation#45

Merged

aseigo merged 96 commits into

feature/full-recurrence

Apr 22, 2026

Commits on Apr 21, 2026

sort recurrence tests into serialization, deserialization, generation
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remove duplicates, sort for easier processing
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use 0 offsets, not nil
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normalize recurrece rule values after parsing
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improve typing accuracy
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small improvements in recurrence normalization
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`Reccurence.from_ics` convenience to parse recurrence from a string
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add a TODO for a future API-breaking release
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a handy little timer function; benchee_lite
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make the default weekday :default; works nicely with Date fns
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beginning of a full-featured recurrence calculator
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more tests
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fix test

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rename Recurrence.weekday to Recurrence.week_start_day

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move as_valid_datetime to ICal for reuse

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recurrences calc week numbers correctly, and correct application order of by*

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implement a very crude max searches to prevent non-halting

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another recurrence test, correct slicing to until date

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organize apply_by/3 by by_*, and add stubs for all missing impls

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spiff up by_* conditionals, add missing ones

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fixes to by_* conditionals

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refactor Recurrence.Generate for clarity and re-use of code behind all/2
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more refactoring: by -> modifier[s], generate_set/6
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wrap responses in :ok/:error tuples, introduce ICal.Recurrence.State
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add optional end and exclusionary dates
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port ICal.Recurrence.stream/2 to use ICal.Recurrence.Generate
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re-type recurrable component, formatting
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start handling rdates (TODO left in one case)
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allow processing recurrence rules without a component
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respect an optional list of other recurrences, update todos
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update docs for ICal.Recurrence.Stream/2
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strike this TODO as it is done
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more docs updates
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use ICal.Recurrence.apply/2
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update features in README
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dstart => dtstart
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do not jump the year if the months are equal
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move some types to Recurrence, start implementing by_day, more tests
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fix tests
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more tests from RFC5545
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def -> defp

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some TODO markers

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implement {:by_day, :expand_week}

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tidies

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use Logger

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more tests

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update the changelog
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track the initial starting date in Recurrence.State, exclude by it
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implement positive monthly-byday day offsets
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more tests
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add a days_in_month that is date type agnostic

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implement netagive monthly-byday day offsets

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remove some fluff
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implement expand/limit for time components
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move functions of same arity together
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fixes for offset weekdays in months
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update credo
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shift UNTIL dates into the tz of the starting date
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make timing configurable, default to false
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remove unused fn
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when shifting dates, do not touch the times, according to spec
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implement pos/neg by day year expansion
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reduce instead of flat_map, improve function name
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by_day limits on yearly recurrences when weekno is set
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simplify {:by_week_number, :expand}
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do not drop timezones when creating a range of datetimes
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keep tz in week_number_bookends, remove week_of_year as now unused
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fix {:by_day, :expand_month} for recurrences not first of the month
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finish out the yearly and weekly test suites
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Commits on Apr 22, 2026