feat: promisify app.dock.show() (#16904)

* feat: promisify app.dock.show

* add a spec

atom/browser/browser.h

@@ -171,7 +171,7 @@ class Browser : public WindowListObserver {
 
   // Hide/Show dock.
   void DockHide();
-  void DockShow();
+  v8::Local<v8::Promise> DockShow(v8::Isolate* isolate);
   bool DockIsVisible();
 
   // Set docks' menu.

atom/browser/browser_mac.mm

@@ -11,6 +11,7 @@
 #include "atom/browser/window_list.h"
 #include "atom/common/application_info.h"
 #include "atom/common/platform_util.h"
+#include "atom/common/promise_util.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
@@ -338,7 +339,8 @@ bool Browser::DockIsVisible() {
           NSApplicationActivationPolicyRegular);
 }
 
-void Browser::DockShow() {
+v8::Local<v8::Promise> Browser::DockShow(v8::Isolate* isolate) {
+  scoped_refptr<util::Promise> promise = new util::Promise(isolate);
   BOOL active = [[NSRunningApplication currentApplication] isActive];
   ProcessSerialNumber psn = {0, kCurrentProcess};
   if (active) {
@@ -357,11 +359,14 @@ void Browser::DockShow() {
       dispatch_after(one_ms, dispatch_get_main_queue(), ^{
         [[NSRunningApplication currentApplication]
             activateWithOptions:NSApplicationActivateIgnoringOtherApps];
+        promise->Resolve();
       });
     });
   } else {
     TransformProcessType(&psn, kProcessTransformToForegroundApplication);
+    promise->Resolve();
   }
+  return promise->GetHandle();
 }
 
 void Browser::DockSetMenu(AtomMenuModel* model) {

docs/api/app.md

@@ -1295,13 +1295,11 @@ Hides the dock icon.
 
 ### `app.dock.show()` _macOS_
 
-Shows the dock icon.
+Returns `Promise<void>` - Resolves when the dock icon is shown.
 
 ### `app.dock.isVisible()` _macOS_
 
 Returns `Boolean` - Whether the dock icon is visible.
-The `app.dock.show()` call is asynchronous so this method might not
-return true immediately after that call.
 
 ### `app.dock.setMenu(menu)` _macOS_
 

spec/api-app-spec.js

@@ -1110,17 +1110,29 @@ describe('app module', () => {
     })
   })
 
-  describe('dock.setMenu', () => {
-    before(function () {
-      if (process.platform !== 'darwin') {
-        this.skip()
-      }
+  describe('dock APIs', () => {
+    describe('dock.setMenu()', () => {
+      it('keeps references to the menu', function () {
+        if (process.platform !== 'darwin') this.skip()
+
+        app.dock.setMenu(new Menu())
+        const v8Util = process.atomBinding('v8_util')
+        v8Util.requestGarbageCollectionForTesting()
+      })
     })
 
-    it('keeps references to the menu', () => {
-      app.dock.setMenu(new Menu())
-      const v8Util = process.atomBinding('v8_util')
-      v8Util.requestGarbageCollectionForTesting()
+    describe('dock.show()', () => {
+      before(function () {
+        if (process.platform !== 'darwin') this.skip()
+      })
+
+      it('returns a Promise', () => {
+        expect(app.dock.show()).to.be.a('promise')
+      })
+
+      it('eventually fulfills', () => {
+        expect(app.dock.show()).to.be.eventually.fulfilled()
+      })
     })
   })
 
@@ -1131,7 +1143,7 @@ describe('app module', () => {
 
     it('becomes fulfilled if the app is already ready', () => {
       expect(app.isReady()).to.be.true()
-      return expect(app.whenReady()).to.be.eventually.fulfilled
+      expect(app.whenReady()).to.be.eventually.fulfilled()
     })
   })