make .prompt() async (#94067)

dev/conductor/core/lib/src/context.dart

@@ -28,7 +28,7 @@ abstract class Context {
   ///
   /// The default implementation reads from STDIN. This can be overriden in UI
   /// implementations that capture user interaction differently.
-  bool prompt(String message) {
+  Future<bool> prompt(String message) async {
     stdio.write('${message.trim()} (y/n) ');
     final String response = stdio.readLineSync().trim();
     final String firstChar = response[0].toUpperCase();

dev/conductor/core/lib/src/next.dart

@@ -141,7 +141,7 @@ class NextContext extends Context {
               '${state.engine.checkoutPath} before proceeding.\n');
         }
         if (autoAccept == false) {
-          final bool response = prompt(
+          final bool response = await prompt(
             'Are you ready to push your engine branch to the repository '
             '${state.engine.mirror.url}?',
           );
@@ -167,7 +167,7 @@ class NextContext extends Context {
         ].join('\n'));
         if (autoAccept == false) {
           // TODO(fujino): actually test if binaries have been codesigned on macOS
-          final bool response = prompt(
+          final bool response = await prompt(
             'Has CI passed for the engine PR and binaries been codesigned?',
           );
           if (!response) {
@@ -274,7 +274,7 @@ class NextContext extends Context {
         }
 
         if (autoAccept == false) {
-          final bool response = prompt(
+          final bool response = await prompt(
             'Are you ready to push your framework branch to the repository '
             '${state.framework.mirror.url}?',
           );
@@ -308,7 +308,7 @@ class NextContext extends Context {
         );
         final String headRevision = await framework.reverseParse('HEAD');
         if (autoAccept == false) {
-          final bool response = prompt(
+          final bool response = await prompt(
             'Are you ready to tag commit $headRevision as ${state.releaseVersion}\n'
             'and push to remote ${state.framework.upstream.url}?',
           );
@@ -343,7 +343,7 @@ class NextContext extends Context {
               dryRun: true,
           );
 
-          final bool response = prompt('Are you ready to publish this release?');
+          final bool response = await prompt('Are you ready to publish this release?');
           if (!response) {
             stdio.printError('Aborting command.');
             updateState(state, stdio.logs);
@@ -363,7 +363,7 @@ class NextContext extends Context {
             '\t$kLuciPackagingConsoleLink',
         );
         if (autoAccept == false) {
-          final bool response = prompt('Have all packaging builds finished successfully?');
+          final bool response = await prompt('Have all packaging builds finished successfully?');
           if (!response) {
             stdio.printError('Aborting command.');
             updateState(state, stdio.logs);

dev/conductor/core/lib/src/start.dart

@@ -447,7 +447,7 @@ class StartContext extends Context {
       candidateBranch,
       FrameworkRepository.defaultBranch,
     );
-    final bool response = prompt(
+    final bool response = await prompt(
       'About to tag the release candidate branch branchpoint of $branchPoint '
       'as $requestedVersion and push it to ${framework.upstreamRemote.url}. '
       'Is this correct?',

dev/conductor/core/test/next_test.dart

@@ -1055,7 +1055,7 @@ void main() {
   });
 
   group('prompt', () {
-    test('can be overridden for different frontend implementations', () {
+    test('can be overridden for different frontend implementations', () async {
       final FileSystem fileSystem = MemoryFileSystem.test();
       final Stdio stdio = _UnimplementedStdio.instance;
       final Checkouts checkouts = Checkouts(
@@ -1070,7 +1070,7 @@ void main() {
         stateFile: fileSystem.file('/statefile.json'),
       );
 
-      final bool response = context.prompt(
+      final bool response = await context.prompt(
         'A prompt that will immediately be agreed to',
       );
       expect(response, true);
@@ -1149,9 +1149,9 @@ class _TestNextContext extends NextContext {
   );
 
   @override
-  bool prompt(String message) {
+  Future<bool> prompt(String message) {
     // always say yes
-    return true;
+    return Future<bool>.value(true);
   }
 }