Rename autoupdate -> auto_update, remove redundancy

app/auto_update.js

@@ -0,0 +1,63 @@
+const autoUpdater = require('electron-updater').autoUpdater
+const { dialog } = require('electron');
+
+const config = require('./config');
+const locale = require('./locale');
+const windowState = require('./window_state');
+
+const hour = 60 * 60;
+const autoUpdaterInterval = hour * 1000;
+
+const RESTART_BUTTON = 0;
+const LATER_BUTTON = 1;
+
+function autoUpdateDisabled() {
+  return process.mas || config.get('disableAutoUpdate');
+}
+
+function checkForUpdates() {
+  autoUpdater.checkForUpdates();
+}
+
+function showUpdateDialog() {
+  const options = {
+    type: 'info',
+    buttons: [
+      locale.messages.autoUpdateRestartButtonLabel.message,
+      locale.messages.autoUpdateLaterButtonLabel.message
+    ],
+    title: locale.messages.autoUpdateNewVersionTitle.message,
+    message: locale.messages.autoUpdateNewVersionMessage.message,
+    detail: locale.messages.autoUpdateNewVersionInstructions.message,
+    defaultId: RESTART_BUTTON,
+    cancelId: LATER_BUTTON
+  }
+
+  dialog.showMessageBox(options, function(response) {
+    if (response == RESTART_BUTTON) {
+      windowState.markShouldQuit();
+      autoUpdater.quitAndInstall();
+    }
+  });
+}
+
+function onError(error) {
+  console.log("Got an error while updating: ", error.stack);
+}
+
+function initialize() {
+  if (autoUpdateDisabled()) {
+    return;
+  }
+
+  autoUpdater.addListener('update-downloaded', showUpdateDialog);
+  autoUpdater.addListener('error', onError);
+
+  checkForUpdates();
+
+  setInterval(checkForUpdates, autoUpdaterInterval);
+}
+
+module.exports = {
+  initialize
+};