autoinst/index.js

Automatically install missing dependencies!

'use strict';

const fs = require('fs');
const path = require('path');
const cp = require('child_process');

const prefix = '[autoinst]';

const { cmd, installer } = (function () {
	let yarn;
	try {
		cp.execSync('yarn --version', { stdio: 'ignore' });
		yarn = true;
	} catch (err) {
		yarn = false;
	}
	return {
		cmd: yarn ? 'yarn add' : 'npm install',
		installer: yarn ? '[yarn]' : '[npm]'
	};
})();

const _require = require;

require = function require (dep) {
	if (!fs.existsSync(module.parent.paths[0])) {
		fs.mkdirSync(module.parent.paths[0]);
	}
	try {
		module.parent.require(dep);
	} catch (err) {
		console.error(`${prefix} ${err.name}: ${err.message}`);
		console.log(`${prefix} ${installer} installing: '${dep}'`);
		try {
			cp.execSync(`${cmd} ${dep}`, { stdio: 'ignore' });
		} catch (err) {
			console.error(`${prefix} ${installer} error: '${dep}'`);
			console.error(`${prefix} message: ${err.name}: ${err.message}`);
			console.error(`${prefix} exit code: ${err.status}`);
			process.exit();
		}
		console.log(`${prefix} ok: '${dep}'`);
		cp.spawnSync(
			process.argv[0], [
				...process.argv.slice(1),
				...process.execArgv
			], { stdio: 'inherit' });
		process.exit();
	}
	return module.parent.require(dep);
};

Object.keys(_require).forEach(key => {
	require[key] = typeof _require[key] === 'function' ? _require[key].bind(_require) : _require[key];
});

module.exports = require;