split setup

Summary:
`static/index.js` is called by Electron's main process, it does the setup required to run Flipper. However, some of this setup is electron specific, other is not. This moves all non-Electron specific code into `setup.js` which later can be called from node, too. All Electron specific stuff is still in `static/index.js`.

On a side note, this remove the renaming from `.sonar` to `.flipper` config folder, as I think most users should have been migrated by now, users that are not yet migrated will lose their settings, which isn't too much of an issue as our settings are very minimal anyways.

Reviewed By: passy

Differential Revision: D13638253

fbshipit-source-id: 22ab2a65ffec87b40bd86899630d582d9dc5d05c

static/index.js

@@ -15,20 +15,11 @@ const fs = require('fs');
 const {exec} = require('child_process');
 const compilePlugins = require('./compilePlugins.js');
 const os = require('os');
+const setup = require('./setup');
 
 // disable electron security warnings: https://github.com/electron/electron/blob/master/docs/tutorial/security.md#security-native-capabilities-and-your-responsibility
 process.env.ELECTRON_DISABLE_SECURITY_WARNINGS = true;
 
-if (!process.env.ANDROID_HOME) {
-  process.env.ANDROID_HOME = '/opt/android_sdk';
-}
-
-// emulator/emulator is more reliable than tools/emulator, so prefer it if
-// it exists
-process.env.PATH = `${process.env.ANDROID_HOME}/emulator:${
-  process.env.ANDROID_HOME
-}/tools:${process.env.PATH}`;
-
 if (process.platform === 'darwin') {
   // If we are running on macOS and the app is called Flipper, we add a comment
   // with the old name, to make it findable via Spotlight using its old name.
@@ -44,29 +35,7 @@ if (process.platform === 'darwin') {
   }
 }
 
-// ensure .flipper folder and config exist
+let {config, configPath, flipperDir} = setup();
-const sonarDir = path.join(os.homedir(), '.sonar');
-const flipperDir = path.join(os.homedir(), '.flipper');
-if (fs.existsSync(flipperDir)) {
-  // nothing to do
-} else if (fs.existsSync(sonarDir)) {
-  // move .sonar to .flipper
-  fs.renameSync(sonarDir, flipperDir);
-} else {
-  fs.mkdirSync(flipperDir);
-}
-
-const configPath = path.join(flipperDir, 'config.json');
-let config = {pluginPaths: [], disabledPlugins: [], lastWindowPosition: {}};
-
-try {
-  config = {
-    ...config,
-    ...JSON.parse(fs.readFileSync(configPath)),
-  };
-} catch (e) {
-  fs.writeFileSync(configPath, JSON.stringify(config));
-}
 
 const pluginPaths = config.pluginPaths
   .concat(

static/setup.js

@@ -0,0 +1,43 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+const path = require('path');
+const os = require('os');
+const fs = require('fs');
+
+module.exports = function() {
+  if (!process.env.ANDROID_HOME) {
+    process.env.ANDROID_HOME = '/opt/android_sdk';
+  }
+
+  // emulator/emulator is more reliable than tools/emulator, so prefer it if
+  // it exists
+  process.env.PATH = `${process.env.ANDROID_HOME}/emulator:${
+    process.env.ANDROID_HOME
+  }/tools:${process.env.PATH}`;
+
+  // ensure .flipper folder and config exist
+  const flipperDir = path.join(os.homedir(), '.flipper');
+  if (!fs.existsSync(flipperDir)) {
+    fs.mkdirSync(flipperDir);
+  }
+
+  const configPath = path.join(flipperDir, 'config.json');
+  let config = {pluginPaths: [], disabledPlugins: [], lastWindowPosition: {}};
+
+  try {
+    config = {
+      ...config,
+      ...JSON.parse(fs.readFileSync(configPath)),
+    };
+  } catch (e) {
+    // file not readable or not parsable, overwrite it with the new config
+    fs.writeFileSync(configPath, JSON.stringify(config));
+  }
+
+  return {config, configPath, flipperDir};
+};