merge API: return if the branch is deleted (#701)

app/api/controller/pullreq/merge.go

@@ -247,6 +247,7 @@ func (c *Controller) Merge(
 		SourceSHA:   mergeOutput.HeadSHA,
 	})
 
+	var branchDeleted bool
 	if ruleOut.DeleteSourceBranch {
 		errDelete := c.gitRPCClient.DeleteBranch(ctx, &gitrpc.DeleteBranchParams{
 			WriteParams: sourceWriteParams,
@@ -255,11 +256,14 @@ func (c *Controller) Merge(
 		if errDelete != nil {
 			// non-critical error
 			log.Ctx(ctx).Err(errDelete).Msgf("failed to delete source branch after merging")
+		} else {
+			branchDeleted = true
 		}
 	}
 
 	return types.MergeResponse{
 		SHA:            sha,
+		BranchDeleted:  branchDeleted,
 		RuleViolations: violations,
 	}, nil
 }

types/pullreq.go

@@ -140,6 +140,7 @@ type PullReqFileView struct {
 
 type MergeResponse struct {
 	SHA            string           `json:"sha,omitempty"`
+	BranchDeleted  bool             `json:"branch_deleted"`
 	ConflictFiles  []string         `json:"conflict_files,omitempty"`
 	RuleViolations []RuleViolations `json:"rule_violations,omitempty"`
 }