ratin 0.1.0

# ratin — Custom input field for Ratatui TUI

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Modular input field component for Ratatui terminal applications with character validation, cursor management, and customizable styling.

## 🚀 Quick Start

```toml
[dependencies]
ratin = "0.1.0"
```

```rust
use ratin::{InputField, CharValidator};

let validator = CharValidator::new()
    .allow_url_chars()
    .with_max_length(200);

let mut input = InputField::new()
    .with_validator(validator)
    .with_placeholder("Enter URL...")
    .with_max_length(100);
```

## 📋 Features

### Input Field

| Feature | Description |
|---------|-------------|
| `new()` | Create new input field |
| `with_placeholder()` | Set placeholder text |
| `with_block()` | Customize block widget |
| `with_max_length()` | Set maximum input length |
| `with_validator()` | Set character validator |
| `get_text()` | Get current input text |
| `clear()` | Clear input field |
| `set_processing()` | Set processing state (locks input) |
| `set_focused()` | Set focus state |
| `set_error()` | Set error message |

### Character Validator

| Method | Description |
|--------|-------------|
| `new()` | Create new validator |
| `with_allowed_chars()` | Set allowed characters (vector) |
| `allow_letters()` | Allow only letters A-Z, a-z |
| `allow_digits()` | Allow only digits 0-9 |
| `allow_alphanumeric()` | Allow letters and digits |
| `allow_url_chars()` | Allow URL-safe characters |
| `allow_email_chars()` | Allow email-safe characters |
| `with_case_sensitive()` | Toggle case sensitivity |

### Styling

| Method | Description |
|--------|-------------|
| `new()` | Create new style |
| `with_focused()` | Set focused border color |
| `with_error()` | Set error border color |
| `with_processing()` | Set processing border color |
| `with_text_color()` | Set text color |
| `with_placeholder_color()` | Set placeholder color |

## 🔧 Usage Examples

### Basic Input

```rust
use ratin::InputField;

let mut input = InputField::new()
    .with_placeholder("Enter your name...")
    .with_max_length(50);
```

### URL Input

```rust
use ratin::{InputField, CharValidator};

let validator = CharValidator::new()
    .allow_url_chars()
    .with_case_sensitive(false);

let mut input = InputField::new()
    .with_validator(validator)
    .with_placeholder("https://example.com...")
    .with_max_length(200);
```

### Numeric Input

```rust
use ratin::{InputField, CharValidator};

let validator = CharValidator::new()
    .allow_digits()
    .with_max_length(10);

let mut input = InputField::new()
    .with_validator(validator)
    .with_placeholder("Enter number...")
    .with_max_length(10);
```

### Custom Character Set

```rust
use ratin::{InputField, CharValidator};

let validator = CharValidator::new()
    .with_allowed_chars(vec!['a', 'b', 'c', '1', '2', '3']);

let mut input = InputField::new()
    .with_validator(validator)
    .with_placeholder("Enter a/b/c or 1/2/3...");
```

### Custom Styling

```rust
use ratin::{InputField, InputStyle};
use ratatui::style::Color;

let style = InputStyle::new()
    .with_focused(Color::Green)
    .with_error(Color::Red)
    .with_processing(Color::Yellow)
    .with_text_color(Color::White)
    .with_placeholder_color(Color::DarkGray);

let mut input = InputField::new()
    .with_style(style)
    .with_placeholder("Styled input...");
```

### Event Handling

```rust
use crossterm::event::{KeyCode};

loop {
    if let Event::Key(key) = event::read()? {
        if key.code == KeyCode::Enter {
            if let Err(e) = input.validate() {
                input.set_error(Some(e.to_string()));
            } else {
                let text = input.get_text();
                input.set_processing(true);
                // Process input...
            }
        } else if key.code == KeyCode::Esc {
            break;
        } else {
            input.handle_key(key.code, key.modifiers);
        }
    }
    
    terminal.draw(|f| {
        input.render(f, area);
    })?;
}
```

## 📦 Installation

### From crates.io

```bash
cargo add ratin
```

### From GitHub

```toml
[dependencies]
ratin = { git = "https://github.com/Fkernel653/ratin" }
```

## 🧩 Module Structure

```
ratin/
├── src/
│   ├── lib.rs          # Public API
│   ├── input.rs        # Main InputField logic
│   ├── style.rs        # Styling and themes
│   ├── validator.rs    # Character validation
│   └── error.rs        # Error types
```

## 🔌 Requirements

| Dependency | Version | Purpose |
|------------|---------|---------|
| [ratatui](https://github.com/ratatui-org/ratatui) | 0.24+ | TUI framework |
| [crossterm](https://github.com/crossterm-rs/crossterm) | 0.27+ | Terminal events |

## 🎯 Key Features

- **Character Validation** — Restrict input to specific characters
- **Cursor Management** — Full cursor control with arrow keys
- **Placeholder Support** — Show hints when empty
- **Processing State** — Lock input during async operations
- **Error Handling** — Visual error feedback
- **Max Length** — Prevent overflow
- **Case Sensitivity** — Optional case-sensitive validation
- **Clean API** — Builder pattern for configuration

## 📄 License

MIT License — [See License](LICENSE)

**Author:** [Fkernel653](https://github.com/Fkernel653)

**Project:** [GitHub](https://github.com/Fkernel653/ratin) • [Crates.io](https://crates.io/crates/ratin) • [Docs.rs](https://docs.rs/ratin)