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.

[v0.2.2-rc1] - 2026年06月02日

Added

• -h / --help flag — shows CLI help (was missing, now works everywhere) (M1)
• lint - stdin support — pipe source directly to type-checker: echo 'let x = 1' | m4 lint - (M1)
• use fs module — file system operations: fs.read(path), fs.write(path, data), fs.exists(path), fs.delete(path) (S1)
• use str module — string utilities: str.len(s), str.slice(s, start, end) (C1)
• skills/m4-coder/SKILL.md — AI agent reference for writing correct m4 code (M5)
• Error codes r012 (Division by Zero) and r013 (Modulo by Zero)

Fixed

• Zig stack traces suppressed in CLI error output — users now see clean messages instead of internal file:line traces (M1)
• Division by zero returns Runtime error [r012]: division by zero instead of crashing with Zig panic (M1)
• Modulo by zero returns Runtime error [r013]: modulo by zero instead of crashing with Zig panic (M1)
• fsRead now validates ftell return value before casting to usize — prevents crash on unseekable files

Changed

• m4 explain exits cleanly without stack trace when called with no error code (M1)
• CLI help: --target flag deduplicated (was -target, --target), build flags integrated into flags section (C2)
• ROADMAP.md removed — self-hosting compiler plan condensed into AGENTS.md "Future Roadmap" section (M3)
• AGENTS.md, README, build.zig.zon bumped to v0.2.2-rc1 (M2)
• SPEC.md bumped to Draft v0.2.2, module list updated with str entry
• README synced with current CLI help output and stdlib module list (wsp-sync)

Removed

• ROADMAP.md — 312-line standalone file, key content absorbed into AGENTS.md (M3)

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Full Changelog: v0.2.1...v0.2.2-rc1

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.

[v0.2.1] - 2026年06月01日

Added

• lint subcommand replacing --check flag — m4 lint <file.m4> parses and type-checks without execution (M1)
• m4 <command> help [--zon|--json|--yaml] pattern for command-specific help on all subcommands (lint, build, explain, version)

Changed

• O(1) variable resolution in compiler via Locals wrapper (ArrayList + StringHashMap), replacing O(n) linear scans in ident and assign-target lookups
• QBE emitter fmt() now writes directly to output buffer instead of allocating and freeing an intermediate string per line
• QBE string collection uses getOrPut() single hash lookup instead of contains() + put() double lookup

Fixed

• m4 build --target cross-compilation now correctly passes target architecture to assembler (-arch) and compiler/linker (-target triple). arm64_apple ↔ amd64_apple cross-compilation verified.
• Native compilation on non-macOS platforms restored — assembler step falls back to plain as without -arch for native non-Apple targets
• buildSubcommandHelpInfo returns empty subcommands list for unrecognized names instead of silently returning full help

Removed

• --check global flag — replaced by lint subcommand

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Full Changelog: v0.1.2...v0.2.1

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.

[v0.2.0-rc2] - 2026年05月30日

Added

• m4 help subcommand with structured output support (--zon, --json, --yaml)
• m4 version subcommand with structured output support (--zon, --json, --yaml)
• src/cli_info.zig — serializable CLI metadata types (FlagInfo, SubcommandInfo,
  UsageMode, HelpInfo, VersionInfo) for structured help/version output
• buildHelpInfo() generates full CLI metadata (subcommands, flags, usage modes)
• runHelp() and runVersion() handlers for subcommand execution

Changed

• --help/-h and --version/-v flags replaced by m4 help and m4 version
  subcommands with optional structured output formatting
• Help text reorganized with explicit Commands section listing all subcommands
  (help, version, build, explain) and their flags
• REPL welcome text shortened to :h help, :q quit

Removed

• -h, --help flag — use m4 help instead
• -v, --version flag — use m4 version instead

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Full Changelog: v0.1.2...v0.2.0-rc2

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.

[v0.1.2] - 2026年05月26日

Added

• Benchmark suite for measuring compiler and VM performance
• async language feature support
• Error codes explainer with AI-friendly output formats

Changed

• Renamed language from "maple" to "m4" with corresponding .m4 file extension
• Updated build.zig.zon dependency fingerprint for the renamed package
• Compiler optimizations for faster compilation times

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Full Changelog: v0.1.1...v0.1.2

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.

[v0.1.0] - 2026年05月24日

Added

• Core language types: tokens, AST, runtime values (nil, bool, int, float, string,
  fn, vec, char), heap objects, bytecode opcodes, and type system
• Hand-written scanner with indentation tracking and recursive-descent Pratt parser
  with structured error collection (text + DiagnosticList)
• Single-pass bytecode compiler, type checker with scope chain environments, and
  register-based VM with call frames and native function dispatch
• Standard library with print/println native functions
• AST pretty-printer for canonical formatting
• Bytecode disassembler for debugging
• Structured error module with multi-format output (ZON, JSON, YAML)
• CLI entry point with REPL, source file execution, pipeline orchestration,
  --debug, --check, --format, and --error-format flags
• Module root re-exporting all public declarations for library consumers

Chores

• Project scaffolding with build.zig, Zig 0.16.0 minimum, and serde dependency

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