index-markdown.js

const fs = require('fs');
const path = require('path');
const sidebar = '_index.md';

function getMarkdownFiles(files = []) {
  return files.filter(file => file.endsWith('.md') && file !== sidebar && file !== '_navbar.md');
}

function getFileLinks(files) {
  return files.map(file => `- [${file.replace('.md', '')}](${file})`).join('\n');
}

function getSubDirLinks(files, directory) {
  const subDirs = files.filter(file => fs.statSync(path.join(directory, file)).isDirectory());
  const subDirsContainingMarkdown = subDirs.filter(subDir => fs.readdirSync(path.join(directory, subDir)).find(file => file.endsWith('.md'))
  );
  return subDirsContainingMarkdown.map(subDir => {
    const resource = fs.readdirSync(path.join(directory, subDir)).find(file => file.toLowerCase() === 'readme.md')
      ? 'README'
      : sidebar
    return `- [:file_folder: **${subDir}**](${subDir}/${resource})`;
  }).join('\n');
}

function getBreadCrumb(parentDir) {
  const homeLink = '[:house: **Home**](/README)';
  return parentDir ? `- ${homeLink}\n- [:arrow_heading_up: **Parent Directory**](${parentDir}${sidebar})` : '';
}

function createIndexes(directory, parentDir, title) {
  const basename = path.basename(directory);
  if (basename.startsWith('.')) {
    return;
  }

  title = title || basename;

  const files = fs.readdirSync(directory);
  const markdownFiles = getMarkdownFiles(files);

  if (markdownFiles.length > 0) {
    const subDirLinks = getSubDirLinks(files, directory);
    const fileLinks = getFileLinks(markdownFiles);
    const breadcrumb = getBreadCrumb(parentDir);

    fs.writeFileSync(path.join(directory, sidebar), `# ${title}\n${breadcrumb}\n${subDirLinks}\n${fileLinks}\n`);
  }

  files
    .filter(file => fs.statSync(path.join(directory, file)).isDirectory())
    .forEach(subDir => createIndexes(path.join(directory, subDir), parentDir ? path.join(parentDir, basename) + '/' : '/'));
}

createIndexes(process.cwd(), undefined, 'imdone-core');
console.log('Indexes created successfully!');