# @vue-tui/runtime

> **Early stage** — under active development. Bug reports welcome, but not recommended for production use yet.

Vue 3 terminal renderer with Yoga flexbox layout — build rich TUI apps with the same component model you use on the web.

[![npm version](https://img.shields.io/npm/v/@vue-tui/runtime?color=%2342b883)](https://www.npmjs.com/package/@vue-tui/runtime)
[![npm downloads](https://img.shields.io/npm/dm/@vue-tui/runtime)](https://www.npmjs.com/package/@vue-tui/runtime)

## Why

- **Vue SFC & JSX** — `<template>`, TSX, or render functions — your choice
- **Yoga flexbox** — the same layout engine behind React Native, not a CSS-subset hack
- **Built-in input system** — keyboard handling, focus management, Tab navigation
- **Terminal-native** — renders directly to stdout, purpose-built for CLI tools and AI agent interfaces

`@vue-tui/runtime` is a terminal platform renderer parallel to `@vue/runtime-dom`, comparable to [React Ink](https://github.com/vadimdemedes/ink) but adapted for Vue's reactivity model.

## Install

```bash
npm install @vue-tui/runtime vue
```

## Quick Start

```ts
// src/main.ts
import { createApp } from "@vue-tui/runtime";
import App from "./App.vue";

createApp(App).mount();
```

```vue
<!-- src/App.vue -->
<script setup lang="ts">
import { shallowRef } from "vue";
import { Box, Text, useInput } from "@vue-tui/runtime";

const count = shallowRef(0);

useInput((input) => {
  if (input === "+") count.value++;
  if (input === "-") count.value--;
});
</script>

<template>
  <Box>
    <Text>Count: </Text>
    <Text bold color="green">{{ count }}</Text>
    <Text dimColor> (+/- to change)</Text>
  </Box>
</template>
```

## Components

| Component     | Description                                                                                    |
| ------------- | ---------------------------------------------------------------------------------------------- |
| `<Box>`       | Flexbox container — direction, wrap, align, justify, gap, padding, margin, borders, background |
| `<Text>`      | Styled text — color, bold, italic, underline, strikethrough, dimColor, wrap/truncate modes     |
| `<Spacer>`    | Expands to fill available space (`flex-grow: 1`)                                               |
| `<Newline>`   | Inserts line breaks (configurable `count`)                                                     |
| `<Static>`    | Renders a list of items once, above the redrawn region                                         |
| `<Transform>` | Applies a string transform function to each rendered line                                      |

## Composables

| Composable                 | Description                                                           |
| -------------------------- | --------------------------------------------------------------------- |
| `useInput(handler, opts?)` | Keyboard input — `(input, key)` with modifier and arrow key detection |
| `useFocus(opts?)`          | Component-level focus — returns `{ isFocused, focus }`                |
| `useFocusManager()`        | App-level focus — `focusNext()`, `focusPrevious()`, `focus(id)`       |
| `useApp()`                 | App lifecycle — `{ exit(error?), waitUntilRenderFlush() }`            |
| `useTerminalSize()`        | Reactive terminal dimensions — `{ columns, rows }`                    |
| `useAnimation(opts?)`      | Frame-based animation loop — returns `{ frame, time, delta, reset }`  |
| `useBoxMetrics(ref)`       | Reactive layout metrics — `{ width, height, left, top, hasMeasured }` |
| `measureElement(node)`     | Imperative read of computed `{ width, height }` from a yoga node      |
| `useCursor()`              | Control terminal cursor visibility                                    |
| `usePaste(handler, opts?)` | Handle clipboard paste events                                         |
| `useStdin()`               | Access stdin stream and raw mode control                              |
| `useStdout()`              | Write directly to stdout                                              |
| `useStderr()`              | Write directly to stderr                                              |

## App Lifecycle

```ts
import { createApp } from "@vue-tui/runtime";

// Fire and forget (most common):
createApp(App).mount();

// Wait for the app to exit:
const app = createApp(App);
app.mount();
await app.waitUntilExit();

// Custom streams (for testing):
createApp(App).mount({ stdout, stdin, stderr });
```

## Links

- [vue-tui](https://github.com/vuejs-ai/vue-tui) — monorepo root
- [`@vue-tui/cli`](https://www.npmjs.com/package/@vue-tui/cli) — dev server with HMR
- [`@vue-tui/testing`](https://www.npmjs.com/package/@vue-tui/testing) — test harness for terminal components

## License

MIT