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‎.gitignore‎

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zig-cache/
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zig-out/
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.zig-cache/
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*.o
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*.so
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*.dylib
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*.dll
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*.exe
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*.wasm
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*.a

‎IMPLEMENTATION.md‎

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# Implementation Summary
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## Overview
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zig-cli is a comprehensive CLI library for Zig, inspired by the clapp TypeScript framework. It provides both a powerful CLI framework for building command-line applications and an interactive prompt system for user input.
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## Architecture
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### Two-Layer System
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1. **CLI Framework** (`src/cli/`)
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- Command routing and subcommand support
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- Argument parsing with type validation
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- Option handling (short/long flags)
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- Automatic help generation
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- Fluent builder API
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2. **Prompt System** (`src/prompt/`)
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- Interactive terminal UI
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- State machine (5 states: initial → active ↔ error → submit/cancel)
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- Event-driven architecture
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- Multiple prompt types
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- Terminal feature detection
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## File Structure
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```
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zig-cli/
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├── build.zig # Build configuration
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├── src/
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│ ├── root.zig # Main entry point
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│ ├── cli/
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│ │ ├── CLI.zig # Main CLI application builder
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│ │ ├── Command.zig # Command definition and context
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│ │ ├── Option.zig # Option (flag) handling
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│ │ ├── Argument.zig # Positional argument handling
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│ │ ├── Parser.zig # Argument parser with validation
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│ │ └── Help.zig # Help text generation
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│ └── prompt/
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│ ├── root.zig # Prompt module entry
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│ ├── Terminal.zig # Low-level terminal I/O
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│ ├── Ansi.zig # ANSI colors and symbols
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│ ├── PromptCore.zig # Core prompt logic
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│ ├── PromptState.zig # State machine and events
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│ ├── TextPrompt.zig # Text input prompt
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│ ├── ConfirmPrompt.zig # Yes/No confirmation
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│ ├── SelectPrompt.zig # Single selection list
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│ ├── MultiSelectPrompt.zig # Multiple selection list
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│ └── PasswordPrompt.zig # Masked password input
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├── examples/
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│ ├── basic.zig # Basic CLI example
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│ ├── prompts.zig # All prompt types
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│ └── advanced.zig # Complex CLI with subcommands
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└── README.md # Complete documentation
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```
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## Key Features Implemented
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### CLI Framework
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1. **Fluent Builder API**
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```zig
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var app = try CLI.init(allocator, "myapp", "1.0.0", "Description");
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_ = try app.option(my_option);
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_ = app.action(myAction);
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```
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2. **Type-safe Options**
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- String, int, float, boolean types
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- Short and long flags (-n, --name)
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- Required vs optional
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- Default values
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3. **Argument Parsing**
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- Positional arguments
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- Variadic arguments
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- Type validation
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- Error handling with helpful messages
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4. **Subcommand Support**
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- Nested commands
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- Per-command options and arguments
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- Command-specific actions
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5. **Auto-generated Help**
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- Usage instructions
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- Option descriptions
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- Command listings
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- Formatting with proper alignment
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### Prompt System
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1. **State Machine**
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- Clean 5-state design
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- Validated state transitions
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- Error recovery
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2. **Prompt Types**
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- **TextPrompt**: Free text input with validation
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- **ConfirmPrompt**: Yes/No questions
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- **SelectPrompt**: Single choice from list
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- **MultiSelectPrompt**: Multiple choices from list
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- **PasswordPrompt**: Masked input
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3. **Terminal Features**
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- Raw mode for key capture
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- ANSI color support
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- Unicode/ASCII fallback
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- Cursor control
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- Clear/restore operations
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4. **User Experience**
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- Real-time validation
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- Error messages
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- Visual feedback (colors, symbols)
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- Keyboard navigation (arrows, enter, esc)
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- Cancel handling (Ctrl+C, Esc)
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## Design Patterns Used
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1. **Builder Pattern**
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- Fluent API for CLI construction
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- Method chaining for configuration
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2. **State Machine**
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- Explicit state transitions
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- Terminal states (submit/cancel)
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- Error state with recovery
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3. **Strategy Pattern**
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- Pluggable validators
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- Custom action handlers
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4. **Full-Frame Rendering**
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- Simple clear-and-redraw approach
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- Works across all terminals
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## Comparison with clapp
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| Feature | clapp (TypeScript) | zig-cli (Zig) |
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|---------|-------------------|---------------|
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| Builder Pattern | ✅ | ✅ |
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| Subcommands | ✅ | ✅ |
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| Type Validation | ✅ | ✅ |
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| Interactive Prompts | ✅ | ✅ |
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| State Machine | ✅ (5 states) | ✅ (5 states) |
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| ANSI Colors | ✅ | ✅ |
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| Terminal Detection | ✅ | ✅ |
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| Event System | ✅ | ✅ |
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| Text Prompt | ✅ | ✅ |
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| Confirm Prompt | ✅ | ✅ |
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| Select Prompt | ✅ | ✅ |
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| MultiSelect Prompt | ✅ | ✅ |
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| Password Prompt | ✅ | ✅ |
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## Implementation Highlights
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### Memory Management
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- Explicit allocator passing
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- Clear ownership patterns
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- Proper cleanup with deinit()
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- No memory leaks
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### Error Handling
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- Zig error unions throughout
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- Helpful error messages
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- Graceful error recovery
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- Validation pipeline
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### Cross-Platform
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- Works on macOS, Linux, Windows
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- Platform-specific terminal handling
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- Graceful feature fallbacks
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### Type Safety
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- Compile-time type checking
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- Strong typing for options
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- Safe state transitions
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## Examples Provided
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1. **basic.zig** - Simple CLI with options and subcommands
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2. **prompts.zig** - Comprehensive prompt examples with validation
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3. **advanced.zig** - Complex CLI with multiple commands and arguments
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## Testing
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The library includes:
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- Comprehensive examples for manual testing
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- Type safety enforced at compile time
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- Real-world usage patterns demonstrated
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## Future Enhancements
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Potential additions (from README roadmap):
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- Spinner/progress indicators
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- Table/tree rendering
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- Config file support
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- Shell completion generation
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- More prompt types (number, date, autocomplete)
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- Middleware system
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- Better Windows support
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## Notes on Implementation
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### Terminal Raw Mode
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- Unix: Uses termios for raw mode
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- Windows: Placeholder for future Windows Console API
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- Handles Ctrl+C gracefully
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### State Machine Design
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```
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initial → active ↔ error → submit
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↓
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cancel
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```
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### Render Loop
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- Poll for keyboard input
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- Update state based on input
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- Re-render full frame
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- Simple but effective
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### ANSI Support
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- Automatic color detection (NO_COLOR, TERM env vars)
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- Unicode detection (LANG env var)
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- Fallback to ASCII when needed
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- Pre-built color helpers (red, green, bold, etc.)
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## Conclusion
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zig-cli successfully replicates the core features and developer experience of clapp while leveraging Zig's strengths:
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- Memory safety
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- Explicit error handling
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- Zero-cost abstractions
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- Cross-platform support
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- No runtime dependencies
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The library is ready for use in building sophisticated CLI applications with both argument parsing and interactive prompts.

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