Wrap - takes a filename and wraps a directory with the same name (minus extension) around it and renames the file to index.md

wrap.js

#!/usr/bin/env node

// takes a filename and wraps a directory with the same name (minus extension) around it and renames the file to whatever you like
// all output is placed in a directory called 'output' in the directory the script is run in.

var fs = require('fs')
var path = require('path')

const searchRecursive = (dir, pattern) => {
  // This is where we store pattern matches of all files inside the directory
  let results = []

    // Read contents of directory
  fs.readdirSync(dir).forEach((dirInner) => {
    // Obtain absolute path
    dirInner = path.resolve(dir, dirInner)
    // Get stats to determine if path is a directory or a file
    const stat = fs.statSync(dirInner)

    // If path is a directory, scan it and combine results
    if (stat.isDirectory()) results = results.concat(searchRecursive(dirInner, pattern))

    // If path is a file and ends with pattern then push it onto results
    if (stat.isFile() && dirInner.endsWith(pattern)) results.push(dirInner)
  })

  return results
}

const library = path.resolve(__dirname, './')
const src = '/path/to/source/files'
const ext = '.extension'
const filename = 'index.md'

searchRecursive(library, '.md').map(dir => {
  const cleaned = dir.replace(src, '').replace(ext, '')
  const array = cleaned.split('/')
  // Creates a sub directory in the current directory so no original files are altered.
  const newdir = `./output/${array[0]}/${array[1]}`
  fs.mkdir(newdir, { recursive: true }, (err) => {
    fs.copyFile(dir, `${newdir}/${filename}`, (err) => {
      if (err) throw err;
      console.log('Wrapping', dir);
    });
  });
  
})