silverbullet-icalendar/conductor/tracks/rrule_generic_formatter_20260219/plan.md

Implementation Plan - Generic RRULE Formatter

Phase 1: Reproduction & Test Setup

• Task: Create reproduction test case for BYDAY object cfab0c3
  • Add a test in icalendar_test.ts mocking a BYDAY property as an array of objects (e.g. [{ day: 'MO' }]).
  • Run the test and confirm it fails with SyntaxError: Invalid weekday string: [object Object].
• Task: Conductor - User Manual Verification 'Reproduction & Test Setup' (Protocol in workflow.md)

Phase 2: Implementation

• Task: Implement Recursive Formatter
  • Update formatRRuleValue in icalendar.ts to be a recursive function.
  • Handle Arrays by joining elements with commas.
  • Handle Date objects using the existing iCal format.
  • Handle property objects (extract date, day, or value properties).
  • Run the reproduction test to confirm it passes.
• Task: Conductor - User Manual Verification 'Implementation' (Protocol in workflow.md)

Phase 3: Verification & Cleanup

• Task: Composite and Regression Testing
  • Add a complex test case containing both nested UNTIL dates and BYDAY arrays.
  • Run the full regression test suite in icalendar_test.ts.
• Task: Conductor - User Manual Verification 'Verification & Cleanup' (Protocol in workflow.md)