pdf-officegen/lib/util.js

Converts one or more PDFs into a powerpoint or word document with one pdf page per slide/page

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

const {info} = require('./logger')

function getStagingDirectory (stagingDir) {
  return new Promise((resolve, reject) => {
    if (stagingDir) {
      fs.stat(stagingDir, (err, s) => {
        if (err || !s.isDirectory()) {
          info(this.options.jobId, 'staging directory:', stagingDir, 'does not exist, creating a new one')
          return this._createTempStagingDirectory()
        } else {
          _createImageDirectory(stagingDir, reject, resolve)
        }
      })
    } else {
      resolve(_createTempStagingDirectory())
    }
  })
}

function _createTempStagingDirectory () {
  return new Promise((resolve, reject) => {
    fs.mkdtemp(path.join(os.tmpdir(), 'pdf_ppt_'), (err, folder) => {
      if (err) reject(err)
      _createImageDirectory(folder, reject, resolve)
    })
  })
}

function _createImageDirectory (folder, reject, resolve) {
  fs.mkdir(path.resolve(folder, 'img'), (err) => {
    if (err) reject(err)
    fs.mkdir(path.resolve(folder, 'pdf'), (err) => {
      if (err) reject(err)
      resolve(folder)
    })
  })
}

function sortPages (imageFiles) {
  // Example: /var/folders/dr/f1q4znd96xv8wp82y4cfgg700000gn/T/pdf_ppt_5tz0dw/img/img-5-10.png
  // File = 5, Page = 10
  const rex = /.*(img|pdf)-(\d*)-(\d*).*/
  return imageFiles.sort((a, b) => {
    let aGrps = rex.exec(a)
    let bGrps = rex.exec(b)
    // PDF File Sequence + Page Sequence Comparison
    const fileGrp = 2
    const pageGrp = 3
    let fileComp = aGrps[fileGrp] - bGrps[fileGrp]
    if (fileComp === 0) {
      return aGrps[pageGrp] - bGrps[pageGrp]
    }
    return fileComp
  })
}

function nowInMillis () {
  return Date.now() // process.hrtime()[1] / 1000000
}

function elapsed (start) {
  return nowInMillis() - start
}

module.exports = {nowInMillis, elapsed, sortPages, getStagingDirectory}