openzeppelin-contracts/scripts/release/update-comment.js

#!/usr/bin/env node

const fs = require('fs');
const glob = require('glob');
const proc = require('child_process');

const gitStatus = proc.execFileSync('git', ['status', '--porcelain', '-uno', 'contracts/**/*.sol']);

if (gitStatus.length > 0) {
  console.error('Contracts directory is not clean');
  process.exit(1);
}

const { version } = require('../../package.json');

const files = glob.sync('contracts/!(mocks)/**/*.sol');

for (const file of files) {
  const current = fs.readFileSync(file, 'utf8');
  const updated = current.replace(
    /(\/\/ SPDX-License-Identifier:.*)$(\n\/\/ OpenZeppelin Contracts v.*$)?/m,
    `$1\n// OpenZeppelin Contracts v${version} (${file.replace('contracts/', '')})`,
  );
  fs.writeFileSync(file, updated);
}

proc.execFileSync('git', ['add', '--update', 'contracts']);