scroll/src/scroll.ts

/**
 * The starting point for running scroll
 */
import {
	Editor,
	getTermios,
	importDefaultForRuntime,
	importForRuntime,
} from './common/mod.ts';

const decoder = new TextDecoder();

export async function main() {
	const { inputLoop, getSize } = await importDefaultForRuntime(
		'terminal_io.ts',
	);
	const { onExit } = await importForRuntime('mod.ts');

	// Setup raw mode, and tear down on error or normal exit
	const t = await getTermios();
	t.enableRawMode();
	onExit(() => {
		console.log('Exit handler called, disabling raw mode\r\n');
		t.disableRawMode();
	});

	// Create the editor itself
	const editor = new Editor(getSize());
	await editor.refreshScreen();

	// The main event loop
	for await (const chunk of inputLoop()) {
		const char = String(decoder.decode(chunk));

		// Clear the screen for output
		await editor.refreshScreen();

		// Process input
		const shouldLoop = editor.processKeyPress(char);

		if (!shouldLoop) {
			return 0;
		}
	}

	return -1;
}

/**
 * Start the event loop
 */
await main();