An immediate-mode TUI library for Odin. Pure Odin, no C, batteries included.
Documentation · Guide · Widgets · Examples

_{examples/demo: plasma, a shaded 3D torus on a braille canvas, live graphs and scripted input, at 60 fps in ~2 ms a frame.}

_{examples/monitor: a live system monitor reading /proc, in the Odlar Yurdu theme.}

Widgets tabs, lists, table, graphs, forms, modals, text area	Truecolor at 60 fps double-buffered diff, one write per frame	Text & markup wrapping by grapheme, [b red]markup[/]
Layout cuts, split, grid, center	Stateful widgets keyboard, mouse, focus	Input keys, modifiers, mouse, paste, focus

hnoss is a plain Odin package; there is no package manager, so add the repository to your project:

git submodule add https://github.com/Huseynteymurzade28/hnoss libs/hnoss   # inside a git repo (git init first)
# or, without git in your project:
git clone https://github.com/Huseynteymurzade28/hnoss libs/hnoss

Then import it by path, relative to the file that imports it (import hnoss "libs/hnoss"), or register a collection once and import it from anywhere in your project:

odin run . -collection:libs=libs      # import hnoss "libs:hnoss"

package main

import hnoss "libs/hnoss"

main :: proc() {
    term, _ := hnoss.init(hnoss.DEFAULT_OPTIONS + {.Mouse_Capture})
    defer hnoss.deinit(&term)           // the terminal is always restored, even on panic or Ctrl+C

    cities := []string{"Bakı", "Gəncə", "Şəki", "Lənkəran"}
    list: hnoss.List_State
    events: []hnoss.Event
    for {
        f := hnoss.begin_frame(&term)
        ui := hnoss.ui(f, events)
        inner := hnoss.box(ui, hnoss.inset(f.area, 1), "🇦🇿 [b]Cities[/]")
        hnoss.focus(ui, &list)
        hnoss.list(ui, inner, cities, &list)          // ↑↓, click, wheel

        for ev in hnoss.unhandled(ui) {
            if hnoss.is_char(ev, 'q') { return }
        }
        hnoss.end_frame(&term)                        // diff, one write
        free_all(context.temp_allocator)
        events = hnoss.poll_events(&term, -1)
    }
}

• Pure Odin. Only core: and base:; raw syscalls on Linux, core:sys/posix on macOS. No ncurses, no C.
• Immediate mode. Calling a widget draws it, handles its input and returns what happened.
• Fast. Only changed cells are written; a full 200×60 truecolor frame diffs in ~2 ms.
• Correct text. Unicode 16 widths and grapheme clusters: 世界, é, 👩‍💻, 🇦🇿.
• Safe. Raw mode, alt screen and cursor are restored on exit, panic and signals.

./build.sh                 # check + tests + all examples into bin/
./build.sh run demo        # or: showcase, monitor, plasma, text, layout, event_inspector, w_<widget>

Runs on Linux and macOS (Intel and Apple Silicon); CI builds and tests both. Windows is #5. examples/monitor reads /proc, so it is Linux-only.

MIT