git ssb

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const xhr = require('xhr')
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patchworkDownloader()
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function patchworkDownloader () {
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  const platformEl = document.querySelector('main .platform')
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  const versionEl = document.querySelector('main .version')
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  const urlEl = document.querySelector('main .url')
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  const assetEl = document.querySelector('main .asset')
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  const platform = getPlatform(navigator.platform)
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  console.log('platform', platform)
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  platformEl.textContent = platform
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  getLatestRelease(function (err, release) {
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    if (err) throw err
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    console.log('release', release)
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    versionEl.textContent = release.version
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    urlEl.textContent = release.url
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    urlEl.href = release.url
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    assetEl.textContent = release.assets[platform]
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    assetEl.href = release.assets[platform]
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  })
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}
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function getPlatform (platform) {
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  if (platform.substring(0, 3).toUpperCase() === 'MAC')
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    return 'mac'
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  if (platform.substring(0, 3).toUpperCase() === 'WIN')
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    return 'windows'
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  if (platform.substring(0, 5).toUpperCase() === 'LINUX')
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    return 'linux'
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  return null
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}
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function getLatestRelease (options, cb) {
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  if (!cb) {
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    cb = options
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    options = {}
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  }
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  const {
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    base = 'https://api.github.com/repos/',
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    target = '/releases/latest',
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    owner = 'ssbc',
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    repo = 'patchwork'
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  } = options
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  xhr({
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    url: `${base}${owner}/${repo}${target}`,
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    responseType: 'json'
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  }, function (err, res, body) {
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    if (err) return cb(err)
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    const {
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      tag_name: version,
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      html_url: url
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    } = body
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    const assets = findAssetUrls(body.assets)
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    cb(null, {
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      version,
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      url,
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      assets
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    })
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  })
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}
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const executablesByPlatform = {
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  mac: [
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    'dmg'
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  ],
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  windows: [
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    'exe'
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  ],
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  linux: [
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    'AppImage'
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  ]
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}
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function findAssetUrls (assets) {
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  var urls = {}
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  assets.forEach(asset => {
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    const url = asset.browser_download_url
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    var extension = url.split('.')
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    extension = extension[extension.length - 1]
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    for (var platform in executablesByPlatform) {
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      if (~executablesByPlatform[platform].indexOf(extension)) {
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        urls[platform] = url
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        return
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      }
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    }
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  })
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  return urls
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}
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