[tool] Proposal to multiple defines for --dart-define-from-file

packages/flutter_tools/lib/src/commands/assemble.dart

@@ -258,24 +258,8 @@ class AssembleCommand extends FlutterCommand {
       results[kExtraGenSnapshotOptions] = (argumentResults[FlutterOptions.kExtraGenSnapshotOptions] as List<String>).join(',');
     }
 
-    List<String> dartDefines = <String>[];
-    if (argumentResults.wasParsed(FlutterOptions.kDartDefinesOption)) {
-      dartDefines = argumentResults[FlutterOptions.kDartDefinesOption] as List<String>;
-    }
-    if (argumentResults.wasParsed(FlutterOptions.kDartDefineFromFileOption)) {
-      final String? configJsonPath = stringArg(FlutterOptions.kDartDefineFromFileOption);
-      if (configJsonPath != null && globals.fs.isFileSync(configJsonPath)) {
-        final String configJsonRaw = globals.fs.file(configJsonPath).readAsStringSync();
-        try {
-          (json.decode(configJsonRaw) as Map<String, dynamic>).forEach((String key, dynamic value) {
-            dartDefines.add('$key=$value');
-          });
-        } on FormatException catch (err) {
-          throwToolExit('Json config define file "--${FlutterOptions.kDartDefineFromFileOption}=$configJsonPath" format err, '
-              'please fix first! format err:\n$err');
-        }
-      }
-    }
+    final Map<String, Object>? defineConfigJsonMap = extractDartDefineConfigJsonMap();
+    final List<String> dartDefines = extractDartDefines(defineConfigJsonMap: defineConfigJsonMap);
     if(dartDefines.isNotEmpty){
       results[kDartDefines] = dartDefines.join(',');
     }

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -642,12 +642,14 @@ abstract class FlutterCommand extends Command<void> {
   }
 
   void useDartDefineConfigJsonFileOption() {
-    argParser.addOption(
+    argParser.addMultiOption(
       FlutterOptions.kDartDefineFromFileOption,
       help: 'The path of a json format file where flutter define a global constant pool. '
           'Json entry will be available as constants from the String.fromEnvironment, bool.fromEnvironment, '
-          'int.fromEnvironment, and double.fromEnvironment constructors; the key and field are json values.',
-      valueHelp: 'use-define-config.json'
+          'int.fromEnvironment, and double.fromEnvironment constructors; the key and field are json values.\n'
+          'Multiple defines can be passed by repeating "--${FlutterOptions.kDartDefineFromFileOption}" multiple times.',
+      valueHelp: 'use-define-config.json',
+      splitCommas: false,
     );
   }
 
@@ -1185,9 +1187,8 @@ abstract class FlutterCommand extends Command<void> {
       ? stringArgDeprecated(FlutterOptions.kPerformanceMeasurementFile)
       : null;
 
-    List<String> dartDefines = argParser.options.containsKey(FlutterOptions.kDartDefinesOption)
-        ? stringsArg(FlutterOptions.kDartDefinesOption)
-        : <String>[];
+    final Map<String, Object>? defineConfigJsonMap = extractDartDefineConfigJsonMap();
+    List<String> dartDefines = extractDartDefines(defineConfigJsonMap: defineConfigJsonMap);
 
     WebRendererMode webRenderer = WebRendererMode.autoDetect;
     if (argParser.options.containsKey(FlutterOptions.kWebRendererFlag)) {
@@ -1198,27 +1199,6 @@ abstract class FlutterCommand extends Command<void> {
       dartDefines = updateDartDefines(dartDefines, webRenderer);
     }
 
-    Map<String, Object>? defineConfigJsonMap;
-    if (argParser.options.containsKey(FlutterOptions.kDartDefineFromFileOption)) {
-      final String? configJsonPath = stringArg(FlutterOptions.kDartDefineFromFileOption);
-      if (configJsonPath != null && globals.fs.isFileSync(configJsonPath)) {
-        final String configJsonRaw = globals.fs.file(configJsonPath).readAsStringSync();
-        try {
-          defineConfigJsonMap = <String, Object>{};
-          // Fix json convert Object value :type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Map<String, Object>' in type cast
-          (json.decode(configJsonRaw) as Map<String, dynamic>).forEach((String key, dynamic value) {
-            defineConfigJsonMap?[key]=value as Object;
-          });
-          defineConfigJsonMap.forEach((String key, Object value) {
-            dartDefines.add('$key=$value');
-          });
-        } on FormatException catch (err) {
-          throwToolExit('Json config define file "--${FlutterOptions.kDartDefineFromFileOption}=$configJsonPath" format err, '
-              'please fix first! format err:\n$err');
-        }
-      }
-    }
-
     return BuildInfo(buildMode,
       argParser.options.containsKey('flavor')
         ? stringArgDeprecated('flavor')
@@ -1334,6 +1314,56 @@ abstract class FlutterCommand extends Command<void> {
     }
   }
 
+  List<String> extractDartDefines({Map<String, Object>? defineConfigJsonMap}) {
+    final List<String> dartDefines = <String>[];
+
+    if (argParser.options.containsKey(FlutterOptions.kDartDefinesOption)) {
+      dartDefines.addAll(stringsArg(FlutterOptions.kDartDefinesOption));
+    }
+
+    if (defineConfigJsonMap == null) {
+      return dartDefines;
+    }
+    defineConfigJsonMap.forEach((String key, Object value) {
+      dartDefines.add('$key=$value');
+    });
+
+    return dartDefines;
+  }
+
+  Map<String, Object>? extractDartDefineConfigJsonMap() {
+    final Map<String, Object> dartDefineConfigJsonMap = <String, Object>{};
+
+    if (argParser.options.containsKey(FlutterOptions.kDartDefineFromFileOption)) {
+      final List<String> configJsonPaths = stringsArg(
+          FlutterOptions.kDartDefineFromFileOption,
+      );
+
+      for (final String path in configJsonPaths) {
+        if (!globals.fs.isFileSync(path)) {
+          throwToolExit('Json config define file "--${FlutterOptions
+              .kDartDefineFromFileOption}=$path" is not a file, '
+              'please fix first!');
+        }
+
+        final String configJsonRaw = globals.fs.file(path).readAsStringSync();
+        try {
+          // Fix json convert Object value :type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Map<String, Object>' in type cast
+          (json.decode(configJsonRaw) as Map<String, dynamic>)
+              .forEach((String key, dynamic value) {
+            dartDefineConfigJsonMap[key] = value as Object;
+          });
+        } on FormatException catch (err) {
+          throwToolExit('Json config define file "--${FlutterOptions
+              .kDartDefineFromFileOption}=$path" format err, '
+              'please fix first! format err:\n$err');
+        }
+      }
+    }
+
+    return dartDefineConfigJsonMap;
+  }
+
   /// Updates dart-defines based on [webRenderer].
   @visibleForTesting
   static List<String> updateDartDefines(List<String> dartDefines, WebRendererMode webRenderer) {

packages/flutter_tools/test/commands.shard/hermetic/assemble_test.dart

@@ -291,6 +291,24 @@ void main() {
     });
   });
 
+  testUsingContext('test --dart-define-from-file option with err file format', () {
+    globals.fs.directory('config').createSync();
+    final CommandRunner<void> commandRunner = createTestCommandRunner(AssembleCommand(
+      buildSystem: TestBuildSystem.all(BuildResult(success: true)),
+    ));
+
+    expect(commandRunner.run(<String>['assemble',
+      '-o Output',
+      'debug_macos_bundle_flutter_assets',
+      '--dart-define=k=v',
+      '--dart-define-from-file=config']),
+        throwsToolExit(message: 'Json config define file "--dart-define-from-file=config" is not a file, please fix first!'));
+  }, overrides: <Type, Generator>{
+    Cache: () => Cache.test(processManager: FakeProcessManager.any()),
+    FileSystem: () => MemoryFileSystem.test(),
+    ProcessManager: () => FakeProcessManager.any(),
+  });
+
   testUsingContext('test --dart-define-from-file option with err json format', () async {
     await globals.fs.file('config.json').writeAsString(
         '''
@@ -317,6 +335,4 @@ void main() {
     FileSystem: () => MemoryFileSystem.test(),
     ProcessManager: () => FakeProcessManager.any(),
   });
-
-
 }