feat(aws-codecommit): New method addToPipelineStage on Repository.

See aws#265 for the discussion about this feature.

packages/@aws-cdk/aws-codecommit/README.md

@@ -49,6 +49,15 @@ const sourceAction = new codecommit.PipelineSource(this, 'CodeCommit', {
 // use sourceAction.artifact as the inputArtifact to later Actions...
 ```
 
+You can also add the Repository to the Pipeline directly:
+
+```ts
+// equivalent to the code above:
+const sourceAction = repository.addToPipelineStage(sourceStage, 'CodeCommit', {
+    artifactName: 'SourceOutput',
+});
+```
+
 ### Events
 
 CodeCommit repositories emit CloudWatch events for certain activity.

packages/@aws-cdk/aws-codecommit/lib/pipeline-action.ts

@@ -3,20 +3,17 @@ import cdk = require('@aws-cdk/cdk');
 import { RepositoryRef } from './repository';
 
 /**
- * Construction properties of the {@link PipelineSource CodeCommit source CodePipeline Action}.
+ * Common properties for creating {@link PipelineSource} -
+ * either directly, through its constructor,
+ * or through {@link RepositoryRef#addToPipelineStage}.
  */
-export interface PipelineSourceProps extends codepipeline.CommonActionProps {
+export interface CommonPipelineSourceProps {
     /**
      * The name of the source's output artifact.
      * Output artifacts are used by CodePipeline as inputs into other actions.
      */
     artifactName: string;
 
-    /**
-     * The CodeCommit repository.
-     */
-    repository: RepositoryRef;
-
     /**
      * @default 'master'
      */
@@ -31,6 +28,16 @@ export interface PipelineSourceProps extends codepipeline.CommonActionProps {
     pollForSourceChanges?: boolean;
 }
 
+/**
+ * Construction properties of the {@link PipelineSource CodeCommit source CodePipeline Action}.
+ */
+export interface PipelineSourceProps extends CommonPipelineSourceProps, codepipeline.CommonActionProps {
+    /**
+     * The CodeCommit repository.
+     */
+    repository: RepositoryRef;
+}
+
 /**
  * CodePipeline Source that is provided by an AWS CodeCommit repository.
  */

packages/@aws-cdk/aws-codecommit/lib/repository.ts

@@ -1,6 +1,8 @@
+import actions = require('@aws-cdk/aws-codepipeline-api');
 import events = require('@aws-cdk/aws-events');
 import cdk = require('@aws-cdk/cdk');
 import { cloudformation, RepositoryArn, RepositoryName } from './codecommit.generated';
+import { CommonPipelineSourceProps, PipelineSource } from './pipeline-action';
 
 /**
  * Properties for the {@link RepositoryRef.import} method.
@@ -53,6 +55,14 @@ export abstract class RepositoryRef extends cdk.Construct {
         };
     }
 
+    public addToPipelineStage(stage: actions.IStage, name: string, props: CommonPipelineSourceProps): PipelineSource {
+        return new PipelineSource(this.parent!!, name, {
+            stage,
+            repository: this,
+            ...props,
+        });
+    }
+
     /**
      * Defines a CloudWatch event rule which triggers for repository events. Use
      * `rule.addEventPattern(pattern)` to specify a filter.

packages/@aws-cdk/aws-codepipeline/test/integ.pipeline-code-commit.ts

@@ -11,10 +11,8 @@ const repo = new codecommit.Repository(stack, 'MyRepo', { repositoryName: 'my-re
 const pipeline = new codepipeline.Pipeline(stack, 'Pipeline');
 
 const sourceStage = new codepipeline.Stage(pipeline, 'source', { pipeline });
-new codecommit.PipelineSource(stack, 'source', {
-    stage: sourceStage,
+repo.addToPipelineStage(sourceStage, 'source', {
     artifactName: 'SourceArtifact',
-    repository: repo,
 });
 
 const buildStage = new codepipeline.Stage(stack, 'build', { pipeline });