Comprehensive Changes Since v0.2.1: Major Feature Expansion

Overview

This commit represents a massive expansion of sunsetr functionality since the initial separation of concerns in v0.2.1. The application has evolved from a basic day/night switcher to a sophisticated color temperature management system with smooth transitions, intelligent state management, and robust error handling.

Core Architecture Enhancements

🏗️ New Module Structure

• constants.rs - Centralized configuration defaults, validation limits, and operational constants
• startup_transition.rs - Smooth animated startup transitions with progress visualization
• process.rs - Complete hyprsunset process lifecycle management
• utils.rs - Interpolation, version comparison, and helper utilities
• Enhanced existing modules with significantly expanded functionality

🎯 Advanced State Management

• Transition States: Beyond simple day/night - now supports gradual transition states with progress tracking
• Startup Transitions: Configurable smooth animations from day values to current state on startup
• Sleep/Resume Detection: Handles system suspend/resume with automatic state recalculation
• Timing Consistency: Prevents state jumping during transition boundaries

Major Feature Additions

🌅 Sophisticated Transition System

• Dynamic Interpolation: Smooth temperature and gamma transitions between day/night values
• Configurable Durations: User-customizable transition timing (5-120 minutes)
• Multiple Transition Modes: "finish_by" mode ensures transitions complete at exact sunrise/sunset times
• Progress Tracking: Real-time transition progress with percentage completion
• Update Intervals: Configurable granularity for transition smoothness

🚀 Startup Transition System

• Animated Progress Bar: Visual feedback during startup transitions with live temp/gamma display
• Dynamic Target Tracking: Handles transitions that are ongoing when sunsetr starts
• Graceful Fallback: Falls back to immediate state application if startup transition fails
• Configurable Duration: 10-60 second startup transitions with 200ms update intervals

🔧 Process Management

• Automatic hyprsunset Startup: Can start and manage hyprsunset process lifecycle
• Conflict Detection: Prevents multiple hyprsunset instances with clear error messages
• Graceful Shutdown: Proper process termination and cleanup on exit
• Socket Validation: Verifies hyprsunset is responsive, not just that socket file exists

📊 Version Compatibility System

• Semantic Version Checking: Validates hyprsunset version compatibility
• Explicit Compatibility Lists: Maintains tested compatible versions
• Detailed Error Messages: Provides upgrade guidance for incompatible versions
• Graceful Degradation: Continues with functional testing if version parsing fails

🖥️ Enhanced User Interface

• Terminal Management: Hides cursor and suppresses control character echo for clean output
• Structured Logging: Hierarchical log formatting with pipes, blocks, and decoration
• Progress Visualization: Real-time progress bars with temperature/gamma display
• Context-Aware Messages: Different output styles for different types of operations

🔄 Robust Error Handling

• Connection Recovery: Automatic retry mechanisms for hyprsunset communication failures
• Lock File Management: Prevents multiple instances with proper cleanup
• Socket Resilience: Handles socket disappearance and reconnection scenarios
• Timeout Management: Prevents hanging on unresponsive hyprsunset connections

⚡ Performance & Reliability

• Intelligent Sleep Intervals: Dynamic sleep durations based on transition state
• Memory Efficient: Minimal resource usage during stable periods
• Signal Handling: Proper SIGINT/SIGTERM handling with cleanup
• Resource Cleanup: Automatic cleanup of processes, sockets, and lock files

Configuration System Overhaul

📝 Extended Configuration Options

# Basic timing (existing)
sunset = "19:00:00"
sunrise = "06:00:00"

# Color temperature control (enhanced)
night_temp = 3300      # Now defaults to 3300K (warmer)
day_temp = 6500        # New day temperature setting
night_gamma = 90.0     # Enhanced with better defaults
day_gamma = 100.0      # Existing

# Process management (new)
start_hyprsunset = true  # Now defaults to true

# Transition system (new)
transition_duration = 45              # minutes
update_interval = 60                  # seconds
transition_mode = "finish_by"         # timing mode

# Startup behavior (new)
startup_transition = true             # enable smooth startup
startup_transition_duration = 10      # seconds

🔍 Comprehensive Validation

• Range Validation: All numeric values validated against safe operational ranges
• Temperature Limits: 1000-20000K with clear error messages
• Gamma Limits: 0.0-100.0% with validation feedback
• Duration Limits: Prevents both too-fast and too-slow transitions
• Time Format Validation: Strict HH:MM:SS format enforcement

Advanced Functionality

🧮 Mathematical Interpolation System

• Linear Interpolation: Smooth transitions between temperature and gamma values
• Clamped Progress: Automatic bounds checking prevents invalid interpolation
• Type-Safe Operations: Separate u32/f32 interpolation functions with proper rounding
• Comprehensive Testing: Extensive test coverage for edge cases and extreme values

🕐 Intelligent Time Management

• Transition Detection: Automatically detects when transitions should start/stop
• Progress Calculation: Real-time progress tracking during ongoing transitions
• Event Scheduling: Calculates optimal sleep intervals until next state change
• Cross-Midnight Handling: Proper handling of transitions that cross midnight

🔌 Robust IPC Communication

• Socket Path Detection: Intelligent socket path resolution with HIS support
• Connection Management: Creates fresh connections per command with automatic cleanup
• Command Retry Logic: Fixed-delay retry attempts with error classification
• Error Recovery: Automatic reconnection attempts with configurable delays

🧪 Comprehensive Testing Framework

• Unit Tests: 54+ test functions covering critical functionality
• Property Tests: Mathematical validation of interpolation functions (with --features proptest)
• Integration Tests: End-to-end configuration and state management scenarios
• Error Case Testing: Comprehensive validation of error paths and edge cases

Technical Improvements

📚 Code Documentation

• Module Documentation: Comprehensive rustdoc for all modules
• Function Documentation: Detailed examples and parameter explanations
• Inline Comments: Extensive code comments explaining complex logic
• Architecture Docs: High-level documentation of system design

🔒 Type Safety & Memory Management

• Strong Typing: Leverages Rust's type system to prevent bugs
• RAII Patterns: Automatic resource cleanup via Drop implementations
• Atomic Operations: Thread-safe flag management for shutdown coordination
• Error Propagation: Comprehensive Result<> usage with context

🏃‍♂️ Performance Optimizations

• Lazy Evaluation: Only recalculates state when necessary
• Efficient Sleep: Uses appropriate sleep intervals to minimize CPU usage
• Fresh Connections: Creates new socket connections per command with immediate cleanup

Breaking Changes from v0.2.1

⚠️ Configuration Changes

• Default Values Updated: Some defaults changed for better user experience
• New Required Dependencies: Added regex crate for version parsing
• File Structure: Configuration validation is now more strict

🔄 API Changes

• Module Structure: Significant reorganization of internal APIs
• Function Signatures: Many internal functions have updated signatures
• Error Types: More specific error types with better context

Migration Notes

📦 Dependencies Added

regex = "1.0"           # For version string parsing
termios = "0.3"         # For terminal control

📋 Configuration Migration

Existing v0.2.1 configurations remain compatible, but users can benefit from:

• Setting start_hyprsunset = true for automatic hyprsunset management
• Adding day_temp = 6500 for full day/night temperature control
• Enabling startup_transition = true for smoother startup experience
• Configuring transition_duration = 45 for gradual day/night changes

Statistics

📊 Lines of Code Growth

• constants.rs: 97 lines (new) - Centralized configuration
• startup_transition.rs: 460 lines (new) - Startup animation system
• process.rs: 138 lines (new) - Process lifecycle management
• utils.rs: 296 lines (new) - Utility functions and interpolation
• Enhanced modules: Significant expansion of existing modules
• Total: ~5000+ lines of well-documented, tested code

🧪 Test Coverage

• Unit Tests: 54+ test functions covering critical functionality
• Property Tests: Mathematical validation of interpolation functions (with --features proptest)
• Integration Tests: End-to-end configuration and state management scenarios
• Error Case Testing: Comprehensive validation of error paths and edge cases

Future Compatibility

This release establishes a solid foundation for future enhancements:

• Plugin System Ready: Modular architecture supports future extensions
• Configuration Extensible: Easy to add new configuration options
• State System Scalable: Transition system can support additional states
• IPC Abstraction: hyprsunset communication can be adapted for other backends

This represents the most significant update to sunsetr since its inception, transforming it from a simple time-based switcher into a sophisticated color temperature management system with smooth transitions, intelligent state handling, and robust error recovery.