A shell script that finds files in a specified directory and returns the instances it is used within another directory. Used to find files that weren't ever required in another file in a repository

find-obsolete.js

#!/usr/bin/env node

const shell = require('child_process');
const path = require('path')

if (process.argv.length <= 3) {
	console.log(`Usage: ${__filename} path/to/directory/with/needles path/to/haystack`);
	process.exit(-1);
}

const filesToCheck = process.argv[2];
const haystack = process.argv[3];

const toShortname = filePath => path.parse(filePath).name;

shell.exec(`find ${filesToCheck} -type f`, (error, stdout) => {
	const needles = stdout.split('\n')
		.filter(n => n)

	const notUsed = [];

	Promise.all(
		needles.map(file => {
			const command = `grep  -Rn --exclude-dir={node_modules,.git,public,views} "${toShortname(file)}'" ${haystack}`;
			return new Promise((resolve) => {
				shell.exec(command, (error, stdout) => {
					const results = stdout.split('\n')
						.filter(line => line.includes('import') || line.includes('require'))
						.filter(n => n)
						.map(line => line
							.split(':')
							.splice(0, 2)
							.join(':')
						)

					console.log('\x1b[36m', file, '\x1b[0m');
					if (!results.length) {
						notUsed.push(file)
						console.log('\x1b[31m', 'Not Found', '\x1b[0m')
					} else {
						results.forEach(match => console.log(match))
					}
					console.log('\n');
					resolve(stdout)
				});
			})
		})
	)
	.then(() => {
		if (notUsed.length) {
			console.log('\x1b[31m', 'These files were not used anywhere', '\x1b[0m')

			notUsed.forEach(file => console.log(file))
		} else {
			console.log('\x1b[32m', 'All good!', '\x1b[0m')
		}

	})
});