Add stub code for generator

angel_orm_generator/lib/src/orm_build_context.dart

@@ -21,7 +21,8 @@ Future<OrmBuildContext> buildOrmContext(
     bool autoIdAndDateFields,
     {bool heedExclude: true}) async {
   var buildCtx = await buildContext(clazz, annotation, buildStep, resolver,
-      autoSnakeCaseNames, autoIdAndDateFields);
+      autoSnakeCaseNames, autoIdAndDateFields,
+      heedExclude: heedExclude);
   var ormAnnotation = reviveORMAnnotation(annotation);
   var ctx = new OrmBuildContext(
       buildCtx,

angel_orm_generator/lib/src/orm_generator.dart

@@ -1,20 +1,41 @@
+import 'dart:async';
+
 import 'package:analyzer/dart/element/element.dart';
 import 'package:angel_orm/angel_orm.dart';
 import 'package:build/build.dart';
+import 'package:code_builder/code_builder.dart' hide LibraryBuilder;
 import 'package:source_gen/source_gen.dart';
 
+import 'orm_build_context.dart';
+
 Builder ormBuilder(_) {
   return new LibraryBuilder(new OrmGenerator(),
       generatedExtension: '.orm.g.dart');
 }
 
+/// Builder that generates `.orm.g.dart`, with an abstract `FooOrm` class.
 class OrmGenerator extends GeneratorForAnnotation<ORM> {
+  final bool autoSnakeCaseNames;
+  final bool autoIdAndDateFields;
+
+  OrmGenerator({this.autoSnakeCaseNames, this.autoIdAndDateFields});
+
   @override
-  generateForAnnotatedElement(
-      Element element, ConstantReader annotation, BuildStep buildStep) {
+  Future<String> generateForAnnotatedElement(
+      Element element, ConstantReader annotation, BuildStep buildStep) async {
     if (element is ClassElement) {
+      var ctx = await buildOrmContext(element, annotation, buildStep,
+          buildStep.resolver, autoSnakeCaseNames, autoIdAndDateFields);
+      var lib = buildOrmBaseLibrary(ctx);
+      return lib.accept(new DartEmitter()).toString();
     } else {
       throw 'The @Orm() annotation can only be applied to classes.';
     }
   }
+
+  Library buildOrmBaseLibrary(OrmBuildContext ctx) {
+    return new Library((lib) {
+
+    });
+  }
 }