scroll/src/common/main.ts

import { readKey } from './fns.ts';
import {
	getRuntime,
	logError,
	logWarning,
	node_process as process,
} from './runtime/mod.ts';
import Editor from './editor.ts';

export async function main() {
	const rt = await getRuntime();
	const { term } = rt;

	// Setup raw mode, and tear down on error or normal exit
	process.stdin.setRawMode(true);
	rt.onExit(() => {
		process.stdin.setRawMode(false);
	});

	// Setup error handler to log to file
	rt.onEvent('error', (error) => {
		process.stdin.setRawMode(false);
		logError(JSON.stringify(error, null, 2));
	});

	const terminalSize = await term.getTerminalSize();

	// Create the editor itself
	const editor = new Editor(terminalSize);

	// Process cli arguments
	if (term.argv.length > 0) {
		const filename = term.argv[0];
		if (filename.trim() !== '') {
			await editor.open(filename);
		}
	}

	editor.setStatusMessage(
		'HELP: Ctrl-S = save | Ctrl-Q = quit | Ctrl-F = find',
	);

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

	while (true) {
		for await (const char of term.inputLoop()) {
			const parsed = readKey(char);
			if (char.length === 0 || parsed.length === 0) {
				logWarning('Empty input returned from runtime input loop');

				return;
			}

			// Process input
			const shouldLoop = await editor.processKeyPress(parsed);
			if (!shouldLoop) {
				return;
			}

			// Render output
			await editor.refreshScreen();
		}
	}
}