added ingresses-only flag

cmd/print.go

@@ -57,6 +57,9 @@ type PrintRunner struct {
 
 	// providers indicates which providers are used to execute convert action.
 	providers []string
+
+	// ingressesOnly indicates whether only the converted Ingresses should be printed.
+	ingressesOnly bool
 }
 
 // PrintGatewaysAndHTTPRoutes performs necessary steps to digest and print
@@ -76,8 +79,11 @@ func (pr *PrintRunner) PrintGatewaysAndHTTPRoutes(cmd *cobra.Command, _ []string
 	if err != nil {
 		return err
 	}
-
-	pr.outputResult(httpRoutes, gateways)
+	if pr.ingressesOnly {
+		pr.outputResult(httpRoutes, nil)
+	} else {
+		pr.outputResult(httpRoutes, gateways)
+	}
 
 	return nil
 }
@@ -92,10 +98,12 @@ func (pr *PrintRunner) outputResult(httpRoutes []gatewayv1beta1.HTTPRoute, gatew
 		return
 	}
 
-	for i := range gateways {
-		err := pr.resourcePrinter.PrintObj(&gateways[i], os.Stdout)
-		if err != nil {
-			fmt.Printf("# Error printing %s HTTPRoute: %v\n", gateways[i].Name, err)
+	if pr.ingressesOnly == false {
+		for i := range gateways {
+			err := pr.resourcePrinter.PrintObj(&gateways[i], os.Stdout)
+			if err != nil {
+				fmt.Printf("# Error printing %s HTTPRoute: %v\n", gateways[i].Name, err)
+			}
 		}
 	}
 
@@ -182,6 +190,7 @@ if specified with --namespace.`)
 	cmd.Flags().StringSliceVar(&pr.providers, "providers", i2gw.GetSupportedProviders(),
 		fmt.Sprintf("If present, the tool will try to convert only resources related to the specified providers, supported values are %v", i2gw.GetSupportedProviders()))
 
+	cmd.Flags().BoolVar(&pr.ingressesOnly, "ingresses-only", false, "If present, the tool will only print the converted Ingresses.")
 	cmd.MarkFlagsMutuallyExclusive("namespace", "all-namespaces")
 	return cmd
 }