Termion

Termion is a pure Rust, bindless library for low-level handling, manipulating and reading information about terminals. This provides a full-featured alternative to Termbox.

Termion aims to be simple and yet expressive. It is bindless, meaning that it is not a front-end to some other library (e.g., ncurses or termbox), but a standalone library directly talking to the TTY.

Termion is quite convinient, due to its complete coverage of essential TTY features, providing one consistent API. Termion is rather low-level containing only abstraction aligned with what actually happens behind the scenes, for something more high-level, refer to inquirer-rs, which uses Termion as backend.

Termion generates escapes and API calls for the user. This makes it a whole lot cleaner to use escapes.

Supports Redox, Mac OS X, BSD, and Linux (or, in general, ANSI terminals).

Documentation. | Examples. | Changelog.

A note on stability

Although small breaking changes might happen, I will try my best to avoid them, and this crate can generally be considered stable.

Cargo.toml

[dependencies]
termion = "1.0.0"

0.1.0 to 1.0.0 guide

This sample table gives an idea of how to go bu converting to the new major version of Termion.

+------------------------------------------------------------

0.1.0	1.0.0
use termion::IntoRawMode	use termion::raw::IntoRawMode
stdout.color(color::Red);	write!(stdout, "{}", color::Fg(color::Red));
stdout.color_bg(color::Red);	write!(stdout, "{}", color::Bg(color::Red));
stdout.goto(x, y);	write!(stdout, "{}", cursor::Goto(x, y));
color::rgb(r, g, b);	color::Rgb(r, g, b) (truecolor)
x.with_mouse()	MouseTerminal::from(x)

Features

• Raw mode.
• TrueColor.
• 256-color mode.
• Cursor movement.
• Color output.
• Calculating ANSI escapes.
• Text formatting.
• Console size.
• Control sequences.
• Termios control.
• Password input.
• Redox support.
• Safe isatty wrapper.
• Panic-free error handling.
• Special keys events (modifiers, special keys, etc.).
• Allocation-free.
• Asynchronous key events.
• Mouse input
• Carefully tested.

and much more.

Examples

Style and colors.

extern crate termion;

use termion::{color, style};

use std::io;

fn main() {
    println!("{}Red", color::Fg(color::Red));
    println!("{}Blue", color::Fg(color::Blue));
    println!("{}Blue'n'Bold{}", style::Bold, style::Reset);
    println!("{}Just plain italic", style::Italic);
}

Moving the cursor

extern crate termion;

fn main() {
    print!("{}{}Stuff", termion::clear::All, termion::cursor::Goto(1, 1));
}

Mouse

extern crate termion;

use termion::event::{Key, Event, MouseEvent};
use termion::input::{TermRead, MouseTerminal};
use termion::raw::IntoRawMode;
use std::io::{Write, stdout, stdin};

fn main() {
    let stdin = stdin();
    let mut stdout = MouseTerminal::from(stdout().into_raw_mode().unwrap());

    write!(stdout, "{}{}q to exit. Click, click, click!", termion::clear::All, termion::cursor::Goto(1, 1)).unwrap();
    stdout.flush().unwrap();

    for c in stdin.events() {
        let evt = c.unwrap();
        match evt {
            Event::Key(Key::Char('q')) => break,
            Event::Mouse(me) => {
                match me {
                    MouseEvent::Press(_, x, y) => {
                        write!(stdout, "{}x", termion::cursor::Goto(x, y)).unwrap();
                    },
                    _ => (),
                }
            }
            _ => {}
        }
        stdout.flush().unwrap();
    }
}

Read a password

extern crate termion;

use termion::input::TermRead;
use std::io::{Write, stdout, stdin};

fn main() {
    let stdout = stdout();
    let mut stdout = stdout.lock();
    let stdin = stdin();
    let mut stdin = stdin.lock();

    stdout.write(b"password: ").unwrap();
    stdout.flush().unwrap();

    let pass = stdin.read_passwd(&mut stdout);

    if let Ok(Some(pass)) = pass {
        stdout.write(pass.as_bytes()).unwrap();
        stdout.write(b"\n").unwrap();
    } else {
        stdout.write(b"Error\n").unwrap();
    }
}

Usage

See examples/, and the documentation, which can be rendered using cargo doc.

For a more complete example, see a minesweeper implementation, that I made for Redox using termion.

License

MIT/X11.