generate-authors.js

'use strict';
/*
 * Generate an AUTHOR file on the repo root and on each lerna package based on git log.
 *
 * Add / change aliases in .mailmap to avoid duplications and show the correct
 * names / emails.
 */
const { execSync } = require('child_process');
const path = require('path');
const fs = require('fs');
const packageRootPath = path.resolve(__dirname, '..');
function getAuthorsGitLog(packagePath) {
  return execSync(
    `git log --reverse --format='%aN <%aE>' --use-mailmap -- ${packagePath}`,
    { cwd: packageRootPath }
  )
    .toString()
    .trim()
    .split('\n');
}

function getAuthorsOrderedByFirstCommit(packagePath) {
  const alreadyAdded = new Set();
  const authors = [];
  for (const authorName of getAuthorsGitLog(packagePath)) {
    if (alreadyAdded.has(authorName)) {
      continue;
    }
    alreadyAdded.add(authorName);
    authors.push(authorName);
  }
  return authors.filter((authorName) => !authorName.includes('[bot]'));
}

function renderAuthorsFileContent(authors) {
  return `${authors.join('\n')}\n`;
}

fs.writeFileSync(
  path.resolve(packageRootPath, 'AUTHORS'),
  renderAuthorsFileContent(getAuthorsOrderedByFirstCommit('.'))
);