Add workflow run query builder for specific workflow

Author: HerrDerb

src/main/java/org/kohsuke/github/GHWorkflow.java

@@ -156,6 +156,16 @@ public PagedIterable<GHWorkflowRun> listRuns() {
         return new GHWorkflowRunsIterable(owner, root().createRequest().withUrlPath(getApiRoute(), "runs"));
     }
 
+    /**
+     * Workflow run query builder for this workflow.
+     *
+     * @return the GHWorkflowRunQueryBuilder instance for querying runs
+     */
+    public GHWorkflowRunQueryBuilder queryRuns() {
+        return new GHWorkflowRunQueryBuilder(this);
+
+    }
+
     private String getApiRoute() {
         if (owner == null) {
             // Workflow runs returned from search to do not have an owner. Attempt to use url.

src/main/java/org/kohsuke/github/GHWorkflowRunQueryBuilder.java

@@ -11,6 +11,7 @@
  * @see GHRepository#queryWorkflowRuns()
  */
 public class GHWorkflowRunQueryBuilder extends GHQueryBuilder<GHWorkflowRun> {
+    private final GHWorkflow ghWorkflow;
     private final GHRepository repo;
 
     /**
@@ -22,6 +23,19 @@ public class GHWorkflowRunQueryBuilder extends GHQueryBuilder<GHWorkflowRun> {
     GHWorkflowRunQueryBuilder(GHRepository repo) {
         super(repo.root());
         this.repo = repo;
+        this.ghWorkflow = null;
+    }
+
+    /**
+     * Instantiates a new GH workflow run query builder for a specific workflow.
+     *
+     * @param ghWorkflow
+     *            the ghWorkflow
+     */
+    GHWorkflowRunQueryBuilder(GHWorkflow ghWorkflow) {
+        super(ghWorkflow.getRepository().root());
+        this.repo = ghWorkflow.getRepository();
+        this.ghWorkflow = ghWorkflow;
     }
 
     /**
@@ -133,7 +147,12 @@ public GHWorkflowRunQueryBuilder headSha(String headSha) {
      */
     @Override
     public PagedIterable<GHWorkflowRun> list() {
-        return new GHWorkflowRunsIterable(repo, req.withUrlPath(repo.getApiTailUrl("actions/runs")));
+        if (ghWorkflow != null) {
+            req.withUrlPath(repo.getApiTailUrl("actions/workflows"), String.valueOf(ghWorkflow.getId()), "runs");
+        } else {
+            req.withUrlPath(repo.getApiTailUrl("actions/runs"));
+        }
+        return new GHWorkflowRunsIterable(repo, req);
     }
 
     /**