# 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

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**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.
