add example electron app

Author: juliangruber

.gitignore

@@ -1,2 +1,4 @@
 node_modules
 .nyc_output
+example/dist
+example/node_modules

README.md

@@ -12,4 +12,14 @@ WIP public electron update server.
 ```bash
 $ npm install
 $ npm start
+```
+
+To try with an actual electron app, run:
+
+```bash
+$ npm start &
+$ cd example
+$ npm install
+$ npm run build
+$ ./dist/mac/dat-desktop.app/Contents/MacOS/dat-desktop
 ```

example/index.js

@@ -0,0 +1,37 @@
+'use strict'
+
+const { autoUpdater } = require('electron')
+
+const server = 'http://localhost:3000'
+const feed = `${server}/dat-land/dat-desktop/${process.platform}/0.0.0`
+
+autoUpdater.setFeedURL(feed)
+autoUpdater.checkForUpdates()
+
+autoUpdater.on('checking-for-update', () => {
+  console.log('checking-for-update')
+})
+
+autoUpdater.on('update-available', () => {
+  console.log('update-available')
+})
+
+autoUpdater.on('update-not-available', () => {
+  console.log('update-not-available')
+})
+
+autoUpdater.on(
+  'update-downloaded',
+  (event, releaseNotes, releaseName, updateURL) => {
+    console.log('update-downloaded', {
+      event,
+      releaseNotes,
+      releaseName,
+      updateURL
+    })
+  }
+)
+
+autoUpdater.on('error', error => {
+  console.log('error', { error })
+})