electron/default_app/renderer.js

const {remote, shell} = require('electron')
const fs = require('fs')
const path = require('path')
const URL = require('url')
const electronPath = path.relative(process.cwd(), remote.process.execPath)

Array.from(document.querySelectorAll('a[href]')).forEach(link => {
  // safely add `?utm_source=default_app
  let url = URL.parse(link.getAttribute('href'), true)
  url.query = Object.assign(url.query, {utm_source: 'default_app'})
  url = URL.format(url)

  link.addEventListener('click', (e) => {
    e.preventDefault()
    shell.openExternal(url)
  })
})

document.querySelector('.electron-version').innerText = `Electron v${process.versions.electron}`
document.querySelector('.chrome-version').innerText = `Chromium v${process.versions.chrome}`
document.querySelector('.node-version').innerText = `Node v${process.versions.node}`
document.querySelector('.v8-version').innerText = `v8 v${process.versions.v8}`
document.querySelector('.command-example').innerText = `${electronPath} path-to-app`

function getOcticonSvg (name) {
  const octiconPath = path.resolve(__dirname, 'node_modules', 'octicons', 'build', 'svg', `${name}.svg`)
  if (fs.existsSync(octiconPath)) {
    const content = fs.readFileSync(octiconPath, 'utf8')
    const div = document.createElement('div')
    div.innerHTML = content
    return div
  }
  return null
}

function loadSVG (element) {
  for (const cssClass of element.classList) {
    if (cssClass.startsWith('octicon-')) {
      const icon = getOcticonSvg(cssClass.substr(8))
      if (icon) {
        icon.classList = element.classList
        element.parentNode.insertBefore(icon, element)
        element.remove()
        break
      }
    }
  }
}

for (const element of document.querySelectorAll('.octicon')) {
  loadSVG(element)
}