feat: Use settings for feature control

Change-Type: minor

lib/gui/app/models/local-settings.js

@@ -36,10 +36,14 @@ const JSON_INDENT = 2
  * - `$XDG_CONFIG_HOME/etcher` or `~/.config/etcher` on Linux
  * - `~/Library/Application Support/etcher` on macOS
  * See https://electronjs.org/docs/api/app#appgetpathname
+ * NOTE: The ternary is due to this module being loaded both,
+ * in Electron's main and renderer processes
  * @constant
  * @type {String}
  */
-const USER_DATA_DIR = electron.remote.app.getPath('userData')
+const USER_DATA_DIR = electron.app
+  ? electron.app.getPath('userData')
+  : electron.remote.app.getPath('userData')
 
 /**
  * @summary Configuration file path
@@ -64,15 +68,21 @@ const CONFIG_PATH = path.join(USER_DATA_DIR, 'config.json')
  */
 const readConfigFile = (filename) => {
   return new Bluebird((resolve, reject) => {
-    fs.readFile(filename, (error, buffer) => {
+    fs.readFile(filename, { encoding: 'utf8' }, (error, contents) => {
+      let data = {}
       if (error) {
         if (error.code === 'ENOENT') {
-          resolve({})
+          resolve(data)
         } else {
           reject(error)
         }
       } else {
-        resolve(JSON.parse(buffer.toString()))
+        try {
+          data = JSON.parse(contents)
+        } catch(e) {
+          // ignore (?)
+        }
+        resolve(data)
       }
     })
   })

lib/gui/etcher.js

@@ -20,31 +20,29 @@ const electron = require('electron')
 const path = require('path')
 const EXIT_CODES = require('../shared/exit-codes')
 const buildWindowMenu = require('./menu')
+const settings = require('./app/models/settings')
+
+/* eslint-disable lodash/prefer-lodash-method */
+
+const config = settings.getDefaults()
 let mainWindow = null
 
-electron.app.on('window-all-closed', electron.app.quit)
-
-// Sending a `SIGINT` (e.g: Ctrl-C) to an Electron app that registers
-// a `beforeunload` window event handler results in a disconnected white
-// browser window in GNU/Linux and macOS.
-// The `before-quit` Electron event is triggered in `SIGINT`, so we can
-// make use of it to ensure the browser window is completely destroyed.
-// See https://github.com/electron/electron/issues/5273
-electron.app.on('before-quit', () => {
-  process.exit(EXIT_CODES.SUCCESS)
-})
-
-electron.app.on('ready', () => {
+/**
+ * @summary Create Etcher's main window
+ * @example
+ * electron.app.on('ready', createMainWindow)
+ */
+const createMainWindow = () => {
   mainWindow = new electron.BrowserWindow({
     width: 800,
     height: 380,
     useContentSize: true,
     show: false,
-    resizable: Boolean(process.env.ETCHER_FULLSCREEN),
+    resizable: Boolean(config.fullscreen),
     maximizable: false,
-    fullscreen: Boolean(process.env.ETCHER_FULLSCREEN),
-    fullscreenable: Boolean(process.env.ETCHER_FULLSCREEN),
-    kiosk: Boolean(process.env.ETCHER_FULLSCREEN),
+    fullscreen: Boolean(config.fullscreen),
+    fullscreenable: Boolean(config.fullscreen),
+    kiosk: Boolean(config.fullscreen),
     autoHideMenuBar: true,
     titleBarStyle: 'hidden-inset',
     icon: path.join(__dirname, '..', '..', 'assets', 'icon.png'),
@@ -57,7 +55,10 @@ electron.app.on('ready', () => {
   buildWindowMenu(mainWindow)
 
   // Prevent flash of white when starting the application
-  mainWindow.on('ready-to-show', mainWindow.show)
+  mainWindow.on('ready-to-show', () => {
+    console.timeEnd('ready-to-show')
+    mainWindow.show()
+  })
 
   mainWindow.on('closed', () => {
     mainWindow = null
@@ -81,4 +82,32 @@ electron.app.on('ready', () => {
   })
 
   mainWindow.loadURL(`file://${path.join(__dirname, 'app', 'index.html')}`)
+}
+
+electron.app.on('window-all-closed', electron.app.quit)
+
+// Sending a `SIGINT` (e.g: Ctrl-C) to an Electron app that registers
+// a `beforeunload` window event handler results in a disconnected white
+// browser window in GNU/Linux and macOS.
+// The `before-quit` Electron event is triggered in `SIGINT`, so we can
+// make use of it to ensure the browser window is completely destroyed.
+// See https://github.com/electron/electron/issues/5273
+electron.app.on('before-quit', () => {
+  process.exit(EXIT_CODES.SUCCESS)
 })
+
+settings.load().then((localSettings) => {
+  Object.assign(config, localSettings)
+}).catch((error) => {
+  // TODO: What do if loading the config fails?
+  console.error('Error loading settings:')
+  console.error(error)
+}).finally(() => {
+  if (electron.app.isReady()) {
+    createMainWindow()
+  } else {
+    electron.app.on('ready', createMainWindow)
+  }
+})
+
+console.time('ready-to-show')