Persist settings in ${XDG_CONFIG_HOME}/flipper/settings

Summary:
Moves the settings state from electron local storage into a json file in the users configured config location.
Unless modified by the user, this will usually be `~/.config/flipper/settings.json`

Settings will now persist across re-installs, and can now be easily inspected and backed up.

Reviewed By: passy

Differential Revision: D17712687

fbshipit-source-id: 1e778063e41d0a1a86145817b9797bf0458121da

src/reducers/index.tsx

@@ -27,11 +27,14 @@ import plugins, {
   Action as PluginsAction,
 } from './plugins';
 import settings, {
-  State as SettingsState,
+  Settings as SettingsState,
   Action as SettingsAction,
 } from './settings';
 import user, {State as UserState, Action as UserAction} from './user';
-
+import JsonFileStorage from '../utils/jsonFileReduxPersistStorage';
+import os from 'os';
+import {resolve} from 'path';
+import xdg from 'xdg-basedir';
 import {persistReducer, PersistPartial} from 'redux-persist';
 
 import {Store as ReduxStore, MiddlewareAPI as ReduxMiddlewareAPI} from 'redux';
@@ -61,6 +64,14 @@ export type State = {
 export type Store = ReduxStore<State, Actions>;
 export type MiddlewareAPI = ReduxMiddlewareAPI<Dispatch<Actions>, State>;
 
+const settingsStorage = new JsonFileStorage(
+  resolve(
+    ...(xdg.config ? [xdg.config] : [os.homedir(), '.config']),
+    'flipper',
+    'settings.json',
+  ),
+);
+
 export default combineReducers<State, Actions>({
   application: persistReducer<ApplicationState, Actions>(
     {
@@ -101,7 +112,7 @@ export default combineReducers<State, Actions>({
     user,
   ),
   settingsState: persistReducer(
-    {key: 'settings', storage, whitelist: ['settings']},
+    {key: 'settings', storage: settingsStorage},
     settings,
   ),
 });