feat: implement generator di module

cherrypick_generator/lib/module_generator.dart

@@ -0,0 +1,60 @@
+// ... остальные импорты ...
+import 'package:analyzer/dart/element/element.dart';
+import 'package:build/build.dart';
+import 'package:source_gen/source_gen.dart';
+import 'package:cherrypick_annotations/cherrypick_annotations.dart' as ann;
+
+class ModuleGenerator extends GeneratorForAnnotation<ann.module> {
+  @override
+  String generateForAnnotatedElement(
+      Element element, ConstantReader annotation, BuildStep buildStep) {
+    if (element is! ClassElement) {
+      throw InvalidGenerationSourceError(
+        '@module() может быть применён только к классам.',
+        element: element,
+      );
+    }
+
+    final classElement = element;
+    final className = classElement.displayName;
+    final generatedClassName = r'$' + className;
+    final buffer = StringBuffer();
+
+    //buffer.writeln("part of '${buildStep.inputId.uri.pathSegments.last}';\n");
+    buffer.writeln('final class $generatedClassName extends $className {');
+    buffer.writeln('  @override');
+    buffer.writeln('  void builder(Scope currentScope) {');
+
+    for (final method in classElement.methods.where((m) => !m.isAbstract)) {
+      final hasSingleton = method.metadata.any(
+        (m) =>
+            m
+                .computeConstantValue()
+                ?.type
+                ?.getDisplayString(withNullability: false)
+                .toLowerCase()
+                .contains('singleton') ??
+            false,
+      );
+      if (!hasSingleton) continue;
+
+      final returnType =
+          method.returnType.getDisplayString(withNullability: false);
+      final methodName = method.displayName;
+      final args = method.parameters
+          .map((p) =>
+              "currentScope.resolve<${p.type.getDisplayString(withNullability: false)}>()")
+          .join(', ');
+
+      buffer.write('    bind<$returnType>()'
+          '.toProvide(() => $methodName($args))'
+          '.singleton();\n');
+    }
+
+    buffer.writeln('  }\n}');
+    return buffer.toString();
+  }
+}
+
+Builder moduleBuilder(BuilderOptions options) =>
+    PartBuilder([ModuleGenerator()], '.cherrypick.g.dart');