pi-tui
Build terminal UI with @mariozechner/pi-tui — component-based TUI with differential rendering. Use when creating TUI screens, input widgets, overlays, or keybindings.
What this skill does
# pi-tui — Component-Based Terminal UI
Component-based TUI framework with differential rendering and synchronized output for flicker-free terminals.
## Core Setup
```typescript
import { TUI, ProcessTerminal } from "@mariozechner/pi-tui";
const tui = new TUI(new ProcessTerminal());
tui.addChild(component); // any Component
tui.start(); // starts rendering loop
tui.stop(); // stops and drains input
```
## Built-in Components (13 total)
| Component | Purpose | Key Methods |
| ------------------------------ | ------------------------------ | ---------------------------------------- |
| `Container` | Holds child components | `addChild()`, `removeChild()`, `clear()` |
| `Text` / `TruncatedText` | Plain text display | `setText()` |
| `Input` | Single-line text input | `getValue()`, `setValue()` |
| `Editor` | Multi-line text editor | `setText()`, `getText()`, `getCursor()` |
| `Markdown` | Render markdown text | `setText()` |
| `SelectList` | Selectable list with filtering | `setFilter()`, `onSelect`, `onCancel` |
| `SettingsList` | Key-value settings editor | `updateValue()` |
| `Box` | Container with background | `setBgFn()` |
| `Spacer` | Vertical spacing | `setLines()` |
| `Loader` / `CancellableLoader` | Loading spinner | `start()`, `stop()`, `setMessage()` |
| `Image` | Render images (base64) | `getImageId()` |
Each component is its own file — import directly from the package, no barrel re-exports.
## Rendering Rules
Every `render(width)` line must not exceed `width` visible columns. Use `truncateToWidth()`, `wrapTextWithAnsi()`, or `visibleWidth()` to enforce this. Each rendered line gets a full SGR reset appended — styles do not carry across lines.
## Focusable Components
`Input`, `Editor` implement `Focusable`. Custom components with cursors must also implement `Focusable` and emit `CURSOR_MARKER` in render output when focused. When a container wraps an Input/Editor, propagate focus to the child for correct IME candidate window positioning.
## Keybindings & Key Detection
Use `matchesKey()` for raw detection: `matchesKey(data, Key.enter)`, `Key.ctrl("c")`, `Key.shift("tab")`. For user-customizable bindings, use the global `KeybindingsManager` via `getKeybindings()` — components like `Editor`, `Input`, `SelectList`, and `SettingsList` route input through named bindings.
## Overlays
```typescript
tui.showOverlay(component, options); // Position: absolute > percentage > anchor
handle.hide(); // Permanent
handle.setHidden(); // Temporary
```
Overlays support `nonCapturing` mode (no keyboard focus steal) and stack with z-ordering by `focusOrder`.
## Custom Components
Each custom component lives in its own file implementing `Component`. For caching, store `cachedLines` and `cachedWidth`, reset in `invalidate()`.
See references/ for complete API reference, custom component patterns, autocomplete providers, terminal image APIs, best practices, and anti-patterns.
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