Delegate to launcher app on startup

Summary:
For the production version, if the Launcher is installed and no `--no-launcher` (note the double-negation) is supplied, then
let the launcher start the app instead.

The launcher will pass the `--no-launcher` option back to prevent this from looping.

Reviewed By: jknoxville

Differential Revision: D14066620

fbshipit-source-id: 27d305efac36005e5e1082076829f10ef14aba0d

static/setup.js

@@ -8,8 +8,37 @@
 const path = require('path');
 const os = require('os');
 const fs = require('fs');
+const {spawn} = require('child_process');
+
+const isProduction = () =>
+  !/node_modules[\\/]electron[\\/]/.test(process.execPath);
+
+const isLauncherInstalled = () => {
+  if (os.type() == 'Darwin') {
+    const receipt = 'com.facebook.flipper.launcher';
+    const plistLocation = '/Applications/Flipper.app/Contents/Info.plist';
+    return (
+      fs.existsSync(plistLocation) &&
+      fs.readFileSync(plistLocation).indexOf(receipt) > 0
+    );
+  }
+
+  return false;
+};
+
+const startLauncher = () => {
+  if (os.type() == 'Darwin') {
+    spawn('open', ['/Applications/Flipper.app']);
+  }
+};
 
 module.exports = function(argv) {
+  if (argv.launcher && isProduction() && isLauncherInstalled()) {
+    console.warn('Delegating to Flipper Launcher ...');
+    startLauncher();
+    process.exit(0);
+  }
+
   if (!process.env.ANDROID_HOME) {
     process.env.ANDROID_HOME = '/opt/android_sdk';
   }