# Sesi Programming Language Roadmap ## Version 1.0 - Foundation (Complete) **Status**: Complete V1.0 implementation **Ready for**: Exploration, learning, building prototypes **Not ready for**: Production systems (until v2.0 with error handling) **Next milestone**: V1.1 ### Core Language Features ✅ - [x] Variables and bindings (let) (const is deprecated) - [x] Functions with parameters and types - [x] Control flow (if/else, while, for, try/catch) - [x] Operators (arithmetic, logical, comparison) - [x] Arrays and objects - [x] Type system with inference - [x] Comments (// and /\* \*/) - [x] String concatenation - [x] Error handling (try/catch blocks) ### Integrated Reasoning Features ✅ - [x] Prompt blocks - [x] Reasoning model calls (model()) - [x] Structured output (structured_output()) - [x] Tool calling (tool_call()) - [x] Stateful context management (memory) ### Built-in Functions ✅ - [x] show (renamed from now deprecated `print` in v1.8.5), type, str, num, bool - [x] len, push, pop, join, split - [x] range, keys, values - [x] read_file, write_file - [x] spawn, exec (Concurrency & Systems) - [x] time, random (Utilities) - [x] Array and object operations ### Tooling ✅ - [x] Lexer and parser - [x] Tree-walking interpreter (retained as fallback execution path) - [x] CLI executable (sesi) - [x] Examples (22 programs) - [x] Documentation ### Limitations - Interpreter is Single-threaded (use `spawn()` for concurrency) - No async/await - Blocking Reasoning calls - Limited error messages - No pattern matching - No generics or custom types --- ## Version 1.5 - Improvements (Complete) **Status**: Complete V1.5 implementation **Ready for**: File manipulation and process orchestration **Not ready for**: Massive-scale production (until v2.0 bytecode) **Next milestone**: V2.0 ### Improvements & Features ✅ - [x] Systems Builtins: `spawn`, `exec`, `time`, `random` - [x] Concurrency: Async polling via file locks for completion and MAX_TOKENS - [x] Image Generation primitive (`image`) and Config blocks (`ratio`, `size`) - [x] File Management Builtins: `list_dir`, `write_image` - [x] Documentation improvements (Extensive Markdown guides) - [x] Bug fixes (tool_call argument passing resolved) - [x] Simple error recovery (Parser synchronization) - [x] Implicit statement termination for blocks ending in `}` - [x] Temporal Context Injection for reasoning calls - [x] Concurrency capabilities (File-based lock pattern) - [x] API reference (`BUILTINS.md`) - [x] Tutorial: Getting started (`QUICKSTART.md`) - [x] Cookbook: Common patterns (`WRITING_SCRIPTS.md`) ### Deferred to V2.0 ⏳ - [x] Better error messages with line numbers and stack traces - [x] REPL (Read-Eval-Print Loop) - [x] String escape sequences & Multiline strings - [x] Comments preservation (for docs) - [x] Type hints in function signatures - [x] Performance optimizations - [x] Tutorial: Writing scripts --- ## Version 2.0 - Advanced Concurrency & Logic (In Progress) **Focus**: Advanced reasoning features and native concurrency ### Async/Await Support - [x] async/await syntax (language level) - [x] Parallel reasoning calls (native) - [x] Promise-like operations - [x] Concurrent execution (Multi-process via `spawn`) ### Advanced Features - [x] Streaming responses - [x] Extended thinking - [x] Multi-step workflows - [x] Tool composition and piping - [x] Custom tool definitions - [x] Function calling with automatic orchestration - [x] Web search grounding ### Memory System - [ ] Long-term memory with embeddings - [x] Memory search by similarity - [x] Context window management - [x] Automatic summarization - [x] Persistent storage (file-based) ### Error Handling - [x] finally blocks (try/catch completed in V1) - [x] Custom error types - [x] Error recovery strategies - [x] Retry logic with exponential backoff - [x] Timeout handling (`timeout(...)` helper and CLI `--timeout`) ### Performance - [x] Bytecode compilation (VM + compiler foundation: expressions, loops, functions, closures, try/catch, imports) - [x] Logic caching - [x] Token counting and cost estimation (`count_tokens`, explicit `estimate_tokens`, `estimate_cost`, and provider-backed `model_usage`) - [x] Lazy evaluation (`lazy(...)` / `force(...)` memoized delayed computations) ### New Built-ins - [x] String functions (to_upper, to_lower, trim, slice, swap) - [x] Array functions (map, filter, reduce, find, etc.) - [x] Math functions (sqrt, sin, cos, floor, ceil, etc.) - [x] Date/time functions - [x] JSON parsing and serialization - [x] HTTP client (get, post) ### Module System - [x] import/export statements - [x] Standard library modules (std/math, std/time, etc.) - [x] Third-party package management - [x] Lib support ### Tooling - [x] Debugger with breakpoints - [x] Profiler for performance analysis (`profile(...)`, manual sections, and CLI `--profile`) - [x] AST visualization - [x] Token stream visualization - [x] Type checking tool - [x] Linter and formatter (Native, no external dependencies) ### Examples - [x] Web scraper with reasoning analysis - [x] Command line utility expansion - [x] Chatbot with memory - [x] Data pipeline with reasoning - [x] API server (with async) --- ## Version 3.0 - Robust Logic Frameworks (2027) **Focus**: Complete language tooling ### Technical Frameworks - [ ] Advanced scripting definition models - [ ] Logic composition and chaining - [ ] Extended process collaboration - [ ] Communication protocols - [ ] Persistence layer ### Knowledge Base - [ ] Vector database integration - [ ] Semantic search - [ ] Knowledge graph support - [ ] RAG (Retrieval-Augmented Generation) - [ ] Document indexing ### Advanced Patterns - [ ] Sub-process execution workflows - [ ] Modular scripting decomposition - [ ] Retry safety check loops - [ ] Deep AST reflection - [ ] Human-in-the-loop prompts ### Ecosystem - [x] Package registry - [ ] Community extensions - [ ] Plugin system - [x] API server template - [ ] Dashboard/UI toolkit ### Examples - [ ] Automated code formatting process - [ ] Document processor (PDF, DOCX) - [ ] Code generation and testing - [ ] Data analysis pipeline - [ ] Multi-process reasoning debate --- ## Version 4.0+ - Vision (2027+) **Focus**: Maturity, optimization, and specialization ### Potential Features - [ ] Compilation to JavaScript/WASM - [ ] JIT compilation for hot paths - [ ] Distributed execution - [ ] Cross-model orchestration (Gemini, Claude, etc.) - [ ] Vision model integration - [ ] Audio processing - [ ] Real-time streaming - [ ] Genetic programming / AutoML - [ ] Formal verification - [ ] Type refinement system ### New Language Constructs - [ ] Pattern matching - [ ] Generics and templates - [ ] Traits/interfaces - [ ] Macros - [ ] DSL support - [ ] Concurrent primitives (channels, mutexes) ### Performance - [ ] LLVM backend option - [ ] WebAssembly compilation - [ ] GPU acceleration - [ ] Distributed computing --- ## Feature Priority Matrix | Feature | Priority | V1 | V2 | V3 | V4+ | | --------------- | --------- | --- | --- | --- | --- | | Basic syntax | 🔴 High | ✅ | | | | | Functions | 🔴 High | ✅ | | | | | Reasoning calls | 🔴 High | ✅ | | | | | Error handling | 🔴 High | ✅ | | | | | Async/await | 🔴 High | | ✅ | | | | Streaming | 🟡 Medium | | ✅ | | | | Process Logic | 🟡 Medium | | | ⏳ | | | Knowledge base | 🟡 Medium | | | ⏳ | | | Module system | 🟡 Medium | | ⏳ | | | | Debugger | 🟢 Low | | ⏳ | | | | Compilation | 🟢 Low | | | | ⏳ | | GPU support | 🟢 Low | | | | ⏳ | --- ## Release Timeline ``` 2026 Q2 └─ v5 - Polish & stabilize 2026 Q3-Q4 └─ v2.0 - Async & advanced APIs 2027 Q1-Q2 └─ v3.0 - Language Ecosystem 2027 Q3+ └─ v4.0+ - Mature compilation ``` --- ## Community & Contribution ### Planned Community Activities - [x] Public GitHub repository - [ ] Discord/Slack community - [ ] Monthly community calls - [ ] RFCs (Request for Comments) for major features - [x] Contribution guidelines - [ ] Code of conduct ### How to Help (When Open Source) - Test programs and report bugs - Contribute documentation - Submit examples - Propose language features - Implement built-in functions - Build tools and extensions --- ## Backwards Compatibility ### Stability Guarantee - **v1.x → v1.y**: Full backwards compatibility - **v1.x → v2.0**: Mostly compatible, deprecation warnings for breaking changes - **v2.x → v3.0**: New features, old syntax still works ### Deprecation Policy 1. Announce deprecation (1 version ahead) 2. Show warnings in compiler 3. Provide migration guide 4. Remove in next major version --- ## Open Questions & Design Discussions ### For the Community 1. Should we support object-oriented programming (classes, inheritance)? 2. Should we add pattern matching or keep it simple? 3. Should memory be file-based by default or in-memory? 4. How should we handle multi-model orchestration? 5. Should processes be stateful or functional? ### Technical Decisions - Type system: Gradual or strict? - Concurrency: Async/await or coroutines? - Module system: Centralized registry or decentralized? - Error handling: Exceptions or Result types? --- ## Performance Goals | Metric | V1 | V2 | V3 | | ---------------------- | ---------- | ------ | ------ | | Startup time | <100ms | <100ms | <50ms | | Simple expression eval | <1µs | <100ns | <10ns | | Function call overhead | <10µs | <1µs | <100ns | | Reasoning latency | 2-5s (API) | 2-5s | 2-5s | | Memory usage | <50MB | <50MB | <100MB | --- ## Inspiration & References ### Language Design - **Python**: Simplicity, readability - **Lua**: Lightweight, embeddable - **JavaScript**: Functions as first-class values - **Go**: Clear error handling - **Rust**: Type safety, memory safety ### Code Control - **CLI utilities**: Direct data piping - **Shell scripting**: Execution transparency - **Modern SDKs**: Model abstraction ### Community - **Rust community**: Welcoming, inclusive - **Python community**: Documentation focus - **Go community**: Simplicity first --- ## Conclusion Sesi is designed to evolve with reasoning needs. The roadmap balances: - **Simplicity** (v1: core features only) - **Power** (v2: advanced reasoning and extended functionality) - **Maturity** (v3: comprehensive libraries and frameworks) - **Scale** (v4+: production readiness and compilation) The journey from v1 (interpreter) to v4+ (distributed compiler) maintains backward compatibility while adding power where needed. **Current focus**: Ship v2.0 with native async/await and advanced reasoning patterns. --- ## See Also - [Quick Start Guide](../QUICKSTART.md) - [Language Specification](SPECIFICATION.md) - [Runtime Architecture](ARCHITECTURE.md) - [Built-in Functions Reference](BUILTINS.md) - [Command Line Interface (CLI) Reference](CLI.md) - [Tutorial: Writing Scripts](WRITING_SCRIPTS.md) - [Image Generation & Input](IMAGE_GENERATION.md) - [Compare to other languages](COMPARISON.md) - [Reasoning & Simple Logic](REASONING.md) - [Examples](../examples)