Move first pieces of functionality of Electron

Summary: Started abstraction some Electron specific APIs away, like process id, select directory dialogs etc.

Reviewed By: timur-valiev, aigoncharov

Differential Revision: D31827016

fbshipit-source-id: e835ac9095e63d7ea79dd0eaf7f2918ac8d09994

desktop/app/src/init.tsx

@@ -50,13 +50,15 @@ import {CopyOutlined} from '@ant-design/icons';
 import {getVersionString} from './utils/versionString';
 import {PersistGate} from 'redux-persist/integration/react';
 // eslint-disable-next-line flipper/no-electron-remote-imports
-import {ipcRenderer, remote} from 'electron';
+import {ipcRenderer, remote, SaveDialogReturnValue} from 'electron';
 import {
   setLoggerInstance,
   setUserSessionManagerInstance,
   GK as flipperCommonGK,
 } from 'flipper-common';
 import {internGraphPOSTAPIRequest} from './fb-stubs/user';
+import {setRenderHostInstance} from './RenderHost';
+import {clipboard} from 'electron';
 
 if (process.env.NODE_ENV === 'development' && os.platform() === 'darwin') {
   // By default Node.JS has its internal certificate storage and doesn't use
@@ -187,6 +189,7 @@ function setProcessState(store: Store) {
 }
 
 function init() {
+  initializeFlipperForElectron();
   // TODO: centralise all those initialisations in a single configuration call
   flipperCommonGK.get = (name) => GK.get(name);
   const store = getStore();
@@ -262,3 +265,37 @@ const CodeBlock = styled(Input.TextArea)({
   ...theme.monospace,
   color: theme.textColorSecondary,
 });
+
+function initializeFlipperForElectron() {
+  setRenderHostInstance({
+    processId: remote.process.pid,
+    readTextFromClipboard() {
+      return clipboard.readText();
+    },
+    selectDirectory(defaultPath = path.resolve('/')) {
+      return remote.dialog
+        .showOpenDialog({
+          properties: ['openDirectory', 'showHiddenFiles'],
+          defaultPath,
+        })
+        .then((result: SaveDialogReturnValue & {filePaths: string[]}) => {
+          if (result.filePath) {
+            return result.filePath.toString();
+          }
+          // Electron typings seem of here, just in case,
+          // (can be tested with settings dialog)
+          // handle both situations
+          if (result.filePaths) {
+            return result.filePaths[0];
+          }
+          return undefined;
+        });
+    },
+    registerShortcut(shortcut, callback) {
+      remote.globalShortcut.register(shortcut, callback);
+    },
+    hasFocus() {
+      return remote.getCurrentWindow().isFocused();
+    },
+  });
+}