A rich, performant TUI library for Rust.

Features

• Layout: Flexbox, grids, splits, and virtualized lists, all with min, max, and preferred-size constraints.
• Images: Kitty with sixel and half-block fallbacks, all working over SSH and tmux passthrough.
• Input: Iterator-based extensible text input with vi, emacs, modern, and custom bindings.
• Harmonious: Generated 256-color palette, consistent with user's base16 theme, zero config.
• Chords: Construct and match on human readable inputs: chord!(Ctrl + Arrow(Up | Down))
• Async: Timers and async callbacks with support for any async runtime.
• Performance: Per subtree/widget/cell dirty tracking, batched queries, shared memory graphics, packed structs.
• GUI: Optionally run as a GUI with box-drawing, smooth scrolling.

Getting started

Install:

cargo add tuie --features=harmonious

Write your main:

use tuie::prelude::*;
use std::process::ExitCode;

fn main() -> std::io::Result<ExitCode> {
    let root = Pane::new()
        .border(Border::SINGLE)
        .child(Text::new().content("hello world"));
    tuie::start_tui(root)
}

Run:

Constructing widgets

Chain builders to create a simple widget tree:

fn greeting(name: String) -> Box<Pane> {
    Pane::new()
        .border(Border::SINGLE)
        .child(Text::new().content(format!("hello {name}")))
}

Or compose widgets together for something more complicated:

struct Greeting {
    root: Box<Pane>,
    text_id: WidgetId<Text>,
}

impl Greeting {
    fn new(name: &str) -> Box<Self> {
        let mut text_id = WidgetId::EMPTY;
        let root = Pane::new().border(Border::SINGLE).child(
            Text::new().content(format!("hello {name}")).id(&mut text_id)
        );
        Box::new(Self { root, text_id })
    }

    fn set_name(&mut self, name: &str) {
        if let Some(text) = self.root.get_widget_mut(self.text_id) {
            text.set_content(format!("hello {name}"));
        }
    }
}

impl DelegateWidget for Greeting {
    tuie::delegate_widget!(root);

    fn override_on_input(&mut self, queue: &mut InputQueue) -> InputResult {
        // you can override or react to your root widget's events and methods
        // using after_* and override_*.
        return self.root.on_input(queue);
    }
}

You can also impl Widget yourself, which is how all of the default widgets are implemented.

Examples

• tuie-demo: discoverable, interactive reference covering most widgets and features.
• fz: fuzzy finder built on tuie, a real-world example of a non-trivial application.

Feature flags

• harmonious — enables Lab-space palette generation from the terminal's base16 colors.
• images — enables the Image widget and ImageConfig/ImageProtocol/ImageSource types; pulls in the image crate.
• gui — enables start_gui and the gui module; pulls in winit, wgpu, pollster, fontdb, and freetype-rs (plus objc2 on macOS). Implies harmonious.