index.js

import path from 'path';
import { spawn } from 'child_process';
import { watchFile, unwatchFile } from 'fs';

import treeKill from './lib/tree-kill.js';

let activeProcess = null;

function start(file) {
	if (activeProcess) {
		treeKill(activeProcess.pid, 'SIGTERM', err => {
			if (err) {
				console.error('Error stopping process:', err);
			} else {
				console.log('Process stopped.');
				activeProcess = null;
				start(file);
			}
		});
	} else {
		console.log('Starting . . .');
		let args = [path.join(process.cwd(), file), ...process.argv.slice(2)];
		let p = spawn(process.argv[0], args, { stdio: ['inherit', 'inherit', 'inherit', 'ipc'] })
			.on('message', data => {
				console.log('[RECEIVED]', data);
				switch (data) {
					case 'reset':
						start(file);
						break;
					case 'uptime':
						p.send(process.uptime());
						break;
				}
			})
			.on('exit', code => {
				console.error('Exited with code:', code);
				if (Number(code) && code === 0) return;
				watchFile(args[0], () => {
					unwatchFile(args[0]);
					start(file);
				});
			});

		activeProcess = p;
	}
}

start('hisoka.js');