node-ignore stdin

ingore.js

#!/usr/bin/env node
import ignore from 'ignore';
/**
 * Filter stdin with script arguments as filter patterns
 *
 * Usage:
 * ```sh
 * git ls-files | node ingore.js '/ignore/me/*' '!/ignore/me/not'
 * find . -type f | cut -d/ -f2- | node ingore.js '/ignore/me/*' '!/ignore/me/not'
 * ```
 */
const filter = ignore().add(process.argv.slice(2).filter(Boolean)).createFilter();

function printLn(line) {
	process.stdout.write(line + '\n');
}

let buffer = '';

function flush() {
	buffer.split('\n').filter(Boolean).filter(filter).forEach(printLn);
	buffer = '';
}

process
	.openStdin()
	.on('data', function (chunk) {
		buffer += chunk;
		if (buffer.endsWith('\n')) flush();
	})
	.on('end', flush);