Cursive

Cursive is a ncurses-based TUI (Text User Interface) library for rust. It is based on jeaye's ncurses-rs.

Documentation

It is designed to be safe and easy to use:

[dependencies]
cursive = "0.0.2"

(You will also need ncurses installed - if it isn't already, check in your package manager.)

extern crate cursive;

use cursive::Cursive;
use cursive::view::{TextView, Dialog};

fn main() {
    // Creates the cursive root - required for every application.
    let mut siv = Cursive::new();

    // Creates a dialog with a single "Quit" button
    siv.add_layer(Dialog::new(TextView::new("Hello Dialog!"))
                         .title("Cursive")
                         .button("Quit", |s| s.quit()));

    // Starts the event loop.
    siv.run();
}

(Colors may depend on your terminal configuration.)

Goals

• Ease of use. Simple apps should be simple. Complex apps should be manageable.
• Linux TTY Compatibility. Colors may suffer, and UTF-8 may be too much, but most features must work properly on a Linux TTY.
• Flexibility. This library should be able to handle simple UI scripts, complex real-time applications, or even games.
  • In particular, it tries to have enough features to recreate these kind of tools:
    • menuconfig
    • nmtui

Non-goals

• Extreme performance. This is a simple layout library, guys, not compiz piped into libcaca. Unless you are running it on your microwave's microcontroller, it's not going to be slow.
• Multi-threaded UI. Callback methods are blocking - careful what you're doing in there! Feel free to use threads on your side, though.
• Complete ncurses equivalent. You can access the underlying ncurses window when creating your own custom views, so you can do what you want with that, but the main library will probably only use a subset of the ncurses features.

Compatibility

First off, terminals are messy. A small set of features is standard, but beyond that, almost every terminal has its own implementation.

Output

• Colors: the basic 8-colors palette should be broadly supported. User-defined colors is not supported in the raw linux TTY, but should work in most terminals, although it's still kinda experimental.
• UTF-8: Currently Cursive really expects a UTF-8 locale. It may eventually get patched to support window borders on other locales, but it's not a priority. Also, Cursive currently expects every codepoint to be a one-column character, so some things may break with exotic characters...

Input

• The key_codes example can be a useful tool to see how the library reacts to various key presses.
• Keep in mind that if the terminal has shortcuts registered, they probably won't be transmitted to the app.
• UTF-8 input should work fine in a unicode-enabled terminal emulator, but raw linux TTY may be more capricious.

Here is the support table for input keys. Tested terminals are mostly Gnome terminal and Linux TTY, xterm, and a few others now and then.

	Key	Shift+Key	Ctrl+Key	Shift+Ctrl+Key
Letters	All	All	All (except c,z,q,s,i,h,m)	None
Numbers	All	All	None (can crash the app)	None
Punctuation	All	All	None (can crash the app)	None
Enter, Esc	All	None	None	None
Left, Right arrow keys	All	VTE+Xterm	VTE+Xterm	VTE+Xterm
Up, Down arrow keys	All	Xterm	VTE+Xterm	Xterm
Ins	All	None (paste clipboard)	Xterm	None
Del	All	VTE+Xterm	VTE+Xterm	VTE+Xterm
Home, End	All	Xterm	Xterm	Xterm
PageUp, PageDown	All	All	All	None
Fn keys: F1-F4	All	All except Konsole	Gnome+XTerm	Gnome+Xterm
Fn keys: F5-F8	All	All	All except TTY	All except TTY
Fn keys: F9-F12	All	All except TTY	All except TTY	All except TTY
PrtScn, ScrollLock	None	None	None	None
Window, Menu	None	None	None	None

Contribute

You want to help? Great! Here is a non-exhaustive list of things you could do:

• Provide example use-case: a good idea of application for existing or new components.
• Check compatibility: run the key_codes example on your favorite terminal, and report the results!
• Test and reports issues: a bug won't get fixed if we don't know it's there.
• Hack the code! If you feel confident with rust, pick an issue you like and hack away!