Add readme template

updateReadme.ts

@@ -0,0 +1,64 @@
+import * as mustache from 'mustache'
+
+import { readFileSync, writeFileSync } from 'fs'
+
+import axios from 'axios'
+
+interface Release {
+  name: string
+  assets: Asset[]
+}
+
+interface Asset {
+  name: string
+  browser_download_url: string
+}
+
+function createUrl(title: string, path: string) {
+  return `[${title}](${path})`
+}
+
+function fileExtension(file: string): string {
+  const match = file.match(/\.([a-zA-Z]+)$/)
+
+  return (match && match[1]) || ''
+}
+
+async function createReadme(): Promise<void> {
+  const release: Release = (await axios.get('https://api.github.com/repos/thomasnordquist/mqtt-explorer/releases/latest')).data
+
+  const linux64 = release.assets.filter(asset => /(x86_64|amd64)\.(AppImage|deb|rpm)$/.test(asset.name))
+  const windowsInstaller = release.assets.find(asset => /Setup-.+\.exe$/.test(asset.name))
+  const windowsPortable = release.assets.find(asset => /-(?!Setup).+\.exe$/.test(asset.name))
+  const macDmg = release.assets.find(asset => /\.dmg$/.test(asset.name))
+
+  if (linux64.length === 0 || !windowsInstaller || !windowsPortable || !macDmg) {
+    console.error('failed retrieving')
+    process.exit(1)
+    return
+  }
+
+  const linuxTargets = linux64
+    .map(item => createUrl(fileExtension(item.browser_download_url), item.browser_download_url))
+    .join(', ')
+
+  const windowsTargets = [
+    createUrl('portable', windowsPortable.browser_download_url),
+    createUrl('installer', windowsInstaller.browser_download_url),
+  ].join(', ')
+
+  const macTargets = [
+    createUrl('dmg', macDmg.browser_download_url),
+  ].join(', ')
+
+  const template = readFileSync('./Readme.tpl.md').toString()
+  const rendered = mustache.render(template, {
+    linuxTargets,
+    windowsTargets,
+    macTargets,
+    version: release.name,
+  })
+  writeFileSync('./Readme.md', rendered)
+}
+
+createReadme()