$ show ical-org/ical.net
This repository is a .NET library (Ical.Net) that implements the iCalendar specification (RFC 5545) for parsing, manipulating, and serializing calendar data in the ICS format. It provides core types such as Calendar, CalendarEvent, Todo, Journal, FreeBusy, VTimeZone, and Alarm, along with comprehensive support for recurrence rules (RRULE, RDATE, EXDATE), time zone handling via NodaTime, and free/busy computation. The architecture follows an object-oriented design with clear separation of concerns: data types (e.g., CalDateTime, Period, RecurrenceRule), calendar components, serializers (e.g., CalendarSerializer, PropertySerializer), and an evaluation engine for expanding recurring occurrences. The library is production-grade, with extensive test coverage (including a large corpus of ICS fixture files and regression tests for bug fixes), benchmarks for performance, and a logging abstraction. It is not a standalone application but a library designed to be consumed by .NET applications that need iCalendar functionality.
The LLM identified 2 files worth highlighting for reuse:
A utility class that rents a char array from System.Buffers.ArrayPool and provides a disposable wrapper for efficient string building. It is self-contained (no internal dependencies beyond standard .NET), demonstrates non-obvious skill in memory optimization, and could be extracted into any .NET project needing high-performance, low-allocation string accumulation.
Provides generic collection utilities including order-independent equality checks (for comparing sets) and a streaming ordered merge of multiple sorted sequences (OrderedMergeMany) with an optional distinct filter. These are isolated static methods that rely only on standard interfaces (IComparer, IEqualityComparer, IEnumerable) and can be reused in any C# project for efficient set operations and merging sorted data streams.