Reduce disk usage for Microsoft Office 365 (Mac) by linking identical files

shrink-microsoft-office-for-mac.js

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

if (process.env.SUDO_UID === undefined) {
  console.log(`Permission denied
sudo required`)

  process.exit(1)
}

const getTarget = undef => {
  let target = process.argv.pop()
  if (target.endsWith('js')) {
    console.log("Target not defined")
    process.exit(2)
  }

  const lib = 'Excel PowerPoint Outlook OneNote'

  target = new RegExp(target, 'i').exec(lib)

  if (target === undef) {
    console.log("Target not found")
    process.exit(3)
  }
  
  if (!fs.existsSync(`/Applications/Microsoft ${target[0]}.app`)) {
    console.log(`${target[0]} not installed.`)
    process.exit(4)
  }
  return target[0]
}

let target = getTarget()

const appDir = (_, name, subDir) => {
  var out = `/Applications/Microsoft ${name}.app/Contents/Frameworks`

  if (subDir) {
    out += `/${subDir}`
  }

  return out
}

const appProofingDir = (_, name) => `/Applications/Microsoft ${name}.app/Contents/SharedSupport/Proofing Tools`

const dir = new Proxy({}, {
  get: (_, name) => new Promise((yes, no) => {
    fs.readdir(appDir`${name}`, (err, files, undef) => {
      (err === undef) ? no(err) : yes(files)
    })
  })
})

Promise.all([dir.Word, dir[target]])
.then(([word, excel]) => {
  let _in = []
  let _out = []


  excel.forEach(ex => (word.includes(ex) ? _in : _out).push(ex))

  return [_in, _out]
})
.then(([_in, _out]) => {
  let Word = "Word"
  _in.forEach(d => {
    console.log('Removing', appDir`${target}${d}`)
    child.execSync('rm -fr "' + appDir`${target}${d}` + '"')

    console.log('Linking', appDir`${target}${d}`)
    child.execSync('ln -fs "' + appDir`${Word}${d}` + '" "' + appDir`${target}${d}` + '"')
    
    console.log()
    
  })

  console.log('Removing', appProofingDir`${target}`)
  child.execSync('rm -fr "' + appProofingDir`${target}` + '"')

  console.log('Linking', appProofingDir`${target}`)
  child.execSync('ln -fs "' + appProofingDir`${Word}` + '" "' + appProofingDir`${target}` + '"')

  console.log()
  console.log('----')
})
.catch(console.error)