An OSX parser for `ioreg` that will get you vendor/device ID and name of devices on PCI bus

lspci_osx.js

const { spawn } = require('child_process')
const Xml = require('xml-stream')
const fetch = require('node-fetch')
const cheerio = require('cheerio')

// apple returns IDs in funny order
const unmangleID = string => {
  if (string) {
    const s = string.split('').slice(0, 4)
    return `${s[2]}${s[3]}${s[0]}${s[1]}`
  }
}

const getDevices = () => new Promise((resolve, reject) => {
  const plist = spawn('ioreg', ['-c', 'IOPCIDevice', '-a'])
  const xml = new Xml(plist.stdout)
  xml.on('error', reject)
  const out = []
  xml.on('end', () => { resolve(out) })
  xml.preserve('dict', true)
  xml.on('endElement: dict', item => {
    if (item.$children) {
      item.$children.forEach(c => {
        if (c.$text === 'IOPCIDevice') {
          const info = item.$children.filter(cc => cc && cc.$text && cc.$text.trim() !== '')
          let vendor
          let device
          let subsystem
          let subsystemVendor
          info.forEach((iv, ii) => {
            if (iv.$text === 'vendor-id') {
              vendor = unmangleID(Buffer.from(info[ii + 1].$text, 'base64').toString('hex'))
            }
            if (iv.$text === 'device-id') {
              device = unmangleID(Buffer.from(info[ii + 1].$text, 'base64').toString('hex'))
            }
            if (iv.$text === 'subsystem-vendor-id') {
              subsystemVendor = unmangleID(Buffer.from(info[ii + 1].$text, 'base64').toString('hex'))
            }
            if (iv.$text === 'subsystem-id') {
              subsystem = unmangleID(Buffer.from(info[ii + 1].$text, 'base64').toString('hex'))
            }
          })
          if (subsystem) {
            out.push(`${vendor}:${device} - ${subsystemVendor} ${subsystem}`)
          } else {
            out.push(`${vendor}:${device}`)
          }
        }
      })
    }
  })
})

// use pci-ids.ucw.cz to lookup vendor/device IDs
const lookup = async () => {
  const devices = await getDevices()
  console.log(await Promise.all(devices.map(d => {
    const [ vendor, device ] = d.split(' - ')[0].split(':')
    return fetch(`https://pci-ids.ucw.cz/read/PC/${vendor}/${device}`)
      .then(r => r.status === 200 && r.text())
      .then(b => b && cheerio.load(b)('.name').text().replace('Name: ', ''))
      .then(name => {
        if (name) {
          return `${d} | ${name}`
        } else {
          return d
        }
      })
  })))
}

lookup()