playground/r/data-transfer/PROJECT_MILESTONES.md

Project Milestones

Dependencies and Crate Management

This section documents all external crates used in the project. We strictly avoid using multiple crates that provide the same core functionality to maintain a clean and maintainable dependency tree.

Core Dependencies

Crate	Version	Purpose	Rationale
clap	4.5.51	Command-line argument parsing	Industry-standard CLI framework with derive API support. Chosen for its ergonomic API, comprehensive feature set, and excellent documentation.
anyhow	1.0.100	Error handling and propagation	Provides simplified error handling for application-level code. Ideal for quickly propagating errors with context up the call stack.
thiserror	2.0.17	Custom error type definitions	Complementary to anyhow, used for defining library-level error types with derive macros. Provides clear error messages and seamless integration with Result types.

Dependency Selection Principles

1. Single Responsibility: Each dependency serves a distinct, non-overlapping purpose
2. Maturity: All selected crates are stable, well-maintained, and widely adopted in the Rust ecosystem
3. Minimal Overhead: Dependencies are lightweight and do not introduce unnecessary transitive dependencies
4. Compatibility: All dependencies work seamlessly together without version conflicts

Future Considerations

As new requirements emerge, the following types of crates may be considered:

• Serialization: serde, serde_json for data format handling
• HTTP Client: reqwest if network operations are needed
• Async Runtime: tokio if asynchronous operations become necessary
• Logging: tracing or log if advanced logging capabilities are required
• Configuration: config or figment if complex configuration management is needed

Version Contents

Version 0.1.0 (Current)

Release Date: November 5, 2025

Status: Initial Development

Features

• ✅ Project Foundation

  • Established modular project structure with clear separation of concerns
  • Implemented core modules: cli, config, error, commands
  • Set up Rust edition 2024 for latest language features
  • Configured dependencies using latest stable versions (clap 4.5.51, anyhow 1.0.100, thiserror 2.0.17)

• ✅ CLI Framework

  • Integrated clap for command-line argument parsing using derive API
  • Implemented verbose flag for detailed logging
  • Created extensible subcommand structure
  • Added help and version information display

• ✅ Error Handling System

  • Defined custom error types using thiserror
  • Implemented DataTransferError enum covering common error scenarios
  • Established Result<T> type alias for consistent error handling
  • Integrated anyhow for application-level error propagation

• ✅ Configuration Management

  • Created Config struct for application settings
  • Implemented configuration loading from CLI arguments
  • Added default configuration support

• ✅ Example Command

  • Implemented sample command as a template for future commands
  • Demonstrated proper error handling patterns
  • Included unit tests for command functionality

• ✅ Testing Infrastructure

  • Added unit tests for configuration module
  • Added unit tests for example command
  • Established testing patterns for future development

Architecture Highlights

1. High Cohesion, Low Coupling: Each module has a single, well-defined responsibility
2. Explicit Error Handling: No use of unwrap() or expect() in production code
3. Ownership Safety: Careful management of borrowing and lifetimes throughout
4. Documentation: Comprehensive inline documentation for all public APIs
5. Test Coverage: Unit tests for critical functionality

Known Limitations

• Currently contains only a placeholder example command
• No persistent configuration file support yet
• Limited logging infrastructure (only verbose flag)

Next Steps

The framework is now ready for feature implementation. Future versions will add:

1. Actual task automation commands based on user requirements
2. Enhanced configuration management (possibly file-based)
3. Improved logging with structured output
4. Integration tests for end-to-end command validation
5. Performance optimizations as needed

---

Note: This document will be updated as new features are implemented and new dependencies are added. All architectural decisions and dependency additions must be documented here to maintain project clarity and technical governance.