Ratatui - Hello World

---

Taken from the Hello world tutorial

• This example turns the terminal blue and writes some text on it.
• It waits till the user presses q and then quits.

examples/ratatui/hello-world/Cargo.toml

[package]
name = "hello-world"
version = "0.1.0"
edition = "2021"

[dependencies]
crossterm = "0.28.1"
ratatui = "0.29.0"

examples/ratatui/hello-world/src/main.rs

use std::io;

use ratatui::{
    crossterm::event::{self, KeyCode, KeyEventKind},
    style::Stylize,
    widgets::Paragraph,
    DefaultTerminal,
};

fn main() -> io::Result<()> {
    let mut terminal = ratatui::init();
    terminal.clear()?;
    let app_result = run(terminal);
    ratatui::restore();
    app_result
}

fn run(mut terminal: DefaultTerminal) -> io::Result<()> {
    loop {
        terminal.draw(|frame| {
            let greeting = Paragraph::new("Hello Ratatui! (press 'q' to quit)")
                .white()
                .on_blue();
            frame.render_widget(greeting, frame.area());
        })?;

        if let event::Event::Key(key) = event::read()? {
            if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
                return Ok(());
            }
        }
    }
}