[tool] Add check for blank lines in CHANGELOG lists

packages/google_fonts/CHANGELOG.md

@@ -306,7 +306,6 @@
   - `Wix Madefor Display`
   - `Wix Madefor Text`
   - `Ysabeau`
-
 - Removed fonts:
   - `Arima Madurai`
   - `Fredoka One`

packages/google_maps_flutter/google_maps_flutter/CHANGELOG.md

@@ -589,7 +589,6 @@ GoogleMapController is now uniformly driven by implementing `DefaultLifecycleObs
 ## 0.5.19
 
 * Adds support for toggling Indoor View on or off.
-
 * Allow BitmapDescriptor scaling override
 
 ## 0.5.18

packages/google_sign_in/google_sign_in/CHANGELOG.md

@@ -183,7 +183,6 @@ For every platform other than `web`, this version should be identical to `5.4.4`
 ## 5.1.0
 
 * Add reAuthenticate option to signInSilently to allow re-authentication to be requested
-
 * Updated Android lint settings.
 
 ## 5.0.7

packages/image_picker/image_picker/CHANGELOG.md

@@ -120,7 +120,6 @@
 ## 0.8.6+2
 
 * Updates `NSPhotoLibraryUsageDescription` description in README.
-
 * Updates minimum Flutter version to 3.0.
 
 ## 0.8.6+1

packages/video_player/video_player/CHANGELOG.md

@@ -593,14 +593,12 @@ DefaultHttpDataSourceFactory by default.
 ## 0.10.0+8
 
 * iOS: Fix an issue where the player sends initialization message incorrectly.
-
 * Fix a few other IDE warnings.
 
 
 ## 0.10.0+7
 
 * Android: Fix issue where buffering status in percentage instead of milliseconds
-
 * Android: Update buffering status everytime we notify for position change
 
 ## 0.10.0+6

packages/video_player/video_player_android/CHANGELOG.md

@@ -163,7 +163,6 @@
 ## 2.7.2
 
 * Updates minimum supported SDK version to Flutter 3.24/Dart 3.5.
-
 * Re-adds Impeller support.
 
 ## 2.7.1

script/tool/lib/src/version_check_command.dart

@@ -130,6 +130,10 @@ class VersionCheckCommand extends PackageLoopingCommand {
         hide: true);
   }
 
+  static final RegExp _blankLineInListRegex = RegExp(
+      r'(^[ \t]*[*+-]\s.*$\n)((^[ \t]*$\n)+)(^[ \t]*[*+-]\s.*$)',
+      multiLine: true);
+
   static const String _againstPubFlag = 'against-pub';
   static const String _prLabelsArg = 'pr-labels';
   static const String _checkForMissingChanges = 'check-for-missing-changes';
@@ -377,7 +381,8 @@ ${indentation}HTTP response: ${pubVersionFinderResponse.httpResponse.body}
 
     // get first version from CHANGELOG
     final File changelog = package.changelogFile;
-    final List<String> lines = changelog.readAsLinesSync();
+    final String changelogContent = changelog.readAsStringSync();
+    final List<String> lines = changelogContent.split('\n');
     String? firstLineWithText;
     final Iterator<String> iterator = lines.iterator;
     while (iterator.moveNext()) {
@@ -455,9 +460,37 @@ ${indentation}The first version listed in CHANGELOG.md is $fromChangeLog.
       }
     }
 
+    // Check for blank lines between list items in the version section.
+    final Match? blankLineMatch = _findBlankLineInList(changelogContent);
+    if (blankLineMatch != null) {
+      final String offendingLines = blankLineMatch
+          .group(0)!
+          .split('\n')
+          .map((String line) => '$indentation  $line') // Add extra indentation
+          .join('\n');
+
+      printError(
+          '${indentation}Blank lines found between list items in CHANGELOG.\n'
+          '${indentation}This creates multiple separate lists on pub.dev.\n'
+          '${indentation}Remove blank lines to keep all items in a single list.\n'
+          '${indentation}The problematic section found is:\n'
+          '$offendingLines');
+      return false;
+    }
+
     return true;
   }
 
+  /// Validates that there are no blank lines between list items within
+  /// the changelog using a regex.
+  ///
+  /// Returns the first invalid match found, or null if validation passes.
+  Match? _findBlankLineInList(String changelogContent) {
+    // If the regex finds a match, it means there is an error (a blank line
+    // between list items).
+    return _blankLineInListRegex.firstMatch(changelogContent);
+  }
+
   Pubspec? _tryParsePubspec(RepositoryPackage package) {
     try {
       final Pubspec pubspec = package.parsePubspec();

script/tool/pubspec.yaml

@@ -1,7 +1,7 @@
 name: flutter_plugin_tools
 description: Productivity and CI utils for flutter/packages
 repository: https://github.com/flutter/packages/tree/main/script/tool
-version: 1.0.0
+version: 1.0.1
 publish_to: none
 
 dependencies:

script/tool/test/version_check_command_test.dart

@@ -421,6 +421,83 @@ void main() {
       );
     });
 
+    test('Fail if CHANGELOG list items have a blank line', () async {
+      const String version = '1.0.1';
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, version: version);
+
+      // Blank line breaks the list items.
+      const String changelog = '''
+## $version
+* First item.
+
+* Second item.
+* Third item.
+''';
+      plugin.changelogFile.writeAsStringSync(changelog);
+      gitProcessRunner.mockProcessesForExecutable['git-show'] =
+          <FakeProcessInfo>[
+        FakeProcessInfo(MockProcess(stdout: 'version: 1.0.0')),
+      ];
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['version-check', '--base-sha=main'],
+          errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Running for plugin'),
+          contains('1.0.0 -> 1.0.1'),
+          contains('Blank lines found between list items in CHANGELOG.'),
+          contains('CHANGELOG.md failed validation.'),
+        ]),
+      );
+    });
+
+    test('Fail if CHANGELOG list items have a blank line with nested items',
+        () async {
+      const String version = '1.0.1';
+      final RepositoryPackage plugin =
+          createFakePlugin('plugin', packagesDir, version: version);
+
+      // Blank line in nested list items.
+      const String changelog = '''
+## $version
+* Top level item.
+  * Nested item A.
+
+  * Nested item B.
+* Another top level item.
+''';
+      plugin.changelogFile.writeAsStringSync(changelog);
+      gitProcessRunner.mockProcessesForExecutable['git-show'] =
+          <FakeProcessInfo>[
+        FakeProcessInfo(MockProcess(stdout: 'version: 1.0.0')),
+      ];
+      Error? commandError;
+      final List<String> output = await runCapturingPrint(
+          runner, <String>['version-check', '--base-sha=main'],
+          errorHandler: (Error e) {
+        commandError = e;
+      });
+
+      expect(commandError, isA<ToolExit>());
+      expect(
+        output,
+        containsAllInOrder(<Matcher>[
+          contains('Running for plugin'),
+          contains('1.0.0 -> 1.0.1'),
+          contains('Blank lines found between list items in CHANGELOG.'),
+          contains('CHANGELOG.md failed validation.'),
+        ]),
+      );
+    });
+    // END OF NEW TESTS
+
     test(
         'Fail if pubspec version only matches an older version listed in CHANGELOG',
         () async {