v2.0.0 - Zig 0.15.1 update

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog,
and this project adheres to Semantic Versioning.

[2.0.0] - 2025-10-09

🚀 Compatibility & Tooling

Build System

• Reworked build.zig for Zig 0.15+: executables/tests/benchmarks now share helper-generated modules, and
  the static archive installs via b.addLibrary.
• Exported module name stays stable for dependents (@import("ohlcv")), removing the old lib/ohlcv.zig
  path requirement.
• zig build run, zig build test, and benchmark steps (zig build benchmark, zig build benchmark-streaming, etc.) stay available through new helper wiring.

HTTP & IO Updates

• HTTP data source now streams into a managed ArrayList writer adapted with writer.adaptToNewApi(...),
  passing the new response_writer on Zig 0.15’s std.http.Client.fetch.
• Demo stdout uses std.fs.File.stdout().writer(...) and guards against std.Io.Writer.Error.WriteFailed
  (common when piping output).

🧠 Library Improvements

Parsers & Time Series

• CSV parser, streaming parser, and time-series utilities now rely on std.array_list.Managed, preserving
  .init, .writer, and capacity helpers under Zig 0.15.
• Benchmarks allocate via the managed lists, matching parser semantics for non-streaming and streaming
  runs.

Consumer Experience

• README now highlights Zig 0.15+ support, with import instructions showing const ohlcv = @import("ohlcv");.
• Build instructions clarify dependency wiring:

  const ohlcv_dep = b.dependency("ohlcv", .{ .target = target, .optimize = optimize });
  exe.root_module.addImport("ohlcv", ohlcv_dep.module("ohlcv"));
  

✅ Verification

• Commands executed on macOS arm64 with Zig 0.15.1:
  • zig build
  • zig build test
  • zig build benchmark, zig build benchmark-streaming, zig build benchmark-performance
  • zig build profile-memory
• Downstream sample (rayzig) compiles once imports switch to @import("ohlcv") and zig fetch --save …
  refreshes the dependency.

Known Limitations

• Requires Zig 0.15.0 or higher.
• CSV dates before 1970 are skipped.
• Rows with zero values are filtered out.

v1.0.0 - Initial Release

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog,
and this project adheres to Semantic Versioning.

1.0.0 - 2025-08-18

🎉 Initial Release

Features

• 37 Technical Indicators - Complete suite of trading indicators:

  • Trend: SMA, EMA, WMA, ADX, DMI, Parabolic SAR
  • Momentum: RSI, MACD, Stochastic, Williams %R, ROC, TRIX, and more
  • Volatility: ATR, Bollinger Bands, Keltner Channels, Donchian Channels
  • Volume: OBV, MFI, CMF, Force Index, Accumulation/Distribution
  • Advanced: Ichimoku Cloud, Heikin Ashi, Pivot Points, Elder Ray, Aroon, Zig Zag

• High-Performance Parsing:

  • Standard CSV parser with 15,000+ rows/ms throughput
  • Streaming parser for processing gigabyte-sized files with constant 4KB memory
  • Optimized fast parser primitives with SIMD-aware line counting
  • Robust error handling (skips invalid rows automatically)

• Memory Management:

  • Memory pooling system for efficient allocation reuse
  • IndicatorArena for batch indicator calculations
  • Zero memory leaks verified across all components

• Data Sources:

  • HTTP data source for remote CSV files
  • File data source for local files
  • Memory data source for in-memory data
  • Preset sources: Bitcoin, S&P 500, Ethereum, Gold

• Time Series Operations:

  • Efficient slicing by time range
  • Filtering with custom predicates
  • Sorting and transformation operations
  • Zero-copy operations where possible

Performance

• Parser throughput: 15,000+ rows/millisecond
• SMA-20 calculation: <0.03ms for 1K data points
• Memory usage: ~47KB per 1K OHLCV rows
• Streaming mode: Constant 4KB regardless of file size

Infrastructure

• Comprehensive test suite with 100% indicator coverage
• GitHub Actions CI/CD pipeline (3 streamlined workflows)
• Automated daily market data updates
• Performance benchmarking suite
• Memory profiling tools

Documentation

• Complete API documentation
• Usage guide with examples
• Architecture documentation
• Performance monitoring guide

Known Limitations

• Requires Zig 0.14.0 or higher
• CSV dates before 1970 are skipped
• Rows with zero values are filtered out