List files recursively in nodejs then do some ad-hoc filtering and renaming

get-files-recursive-sync.js

const fs = require('fs')
const path = require('path')
const child_process = require('child_process')

function getFilesRecursiveSync(folder) {
  const fileContents = fs.readdirSync(folder)

  return fileContents.reduce(function(matches, fileName) {
    const filePath = path.join(folder, fileName)
    const stats = fs.lstatSync(filePath)

    if (stats.isDirectory()) {
      const subFolder = filePath
      const recurseReturn = matches.concat(getFilesRecursiveSync(subFolder))
      return recurseReturn
    } else {
      const concatReturn = matches.concat([path.join(folder, fileName)])
      return concatReturn
    }
  }, [])
}

function leftPadFile(f) {
  const { dir, name, ext } = path.parse(f)
  const newName = ('00' + name).slice(-2)
  return path.format({ dir, name: newName, ext })
}

const mdFiles = getFilesRecursiveSync('./articles').filter(f =>
  f.match(/\.md$/)
)
console.log({ mdFiles })

const newMdFiles = mdFiles.map(leftPadFile)
console.log({ newMdFiles })

// mdFiles.forEach(f => fs.renameSync(f, leftPadFile(f)))

mdFiles.forEach(mdFile => {
  const newMdFile = leftPadFile(mdFile)
  const gitOutput = child_process.execSync(`git mv -k ${mdFile} ${newMdFile}`)
  console.log(gitOutput)
})