devlopment branch (#1736)

vendor/k8s.io/kubectl/pkg/cmd/get/skip_printer.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package get
+
+import (
+	"io"
+
+	metav1beta1 "k8s.io/apimachinery/pkg/apis/meta/v1beta1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/cli-runtime/pkg/printers"
+)
+
+// skipPrinter allows conditionally suppressing object output via the output field.
+// table objects are suppressed by setting their Rows to nil (allowing column definitions to propagate to the delegate).
+// non-table objects are suppressed by not calling the delegate at all.
+type skipPrinter struct {
+	delegate printers.ResourcePrinter
+	output   *bool
+}
+
+func (p *skipPrinter) PrintObj(obj runtime.Object, writer io.Writer) error {
+	if *p.output {
+		return p.delegate.PrintObj(obj, writer)
+	}
+
+	table, isTable := obj.(*metav1beta1.Table)
+	if !isTable {
+		return nil
+	}
+
+	table = table.DeepCopy()
+	table.Rows = nil
+	return p.delegate.PrintObj(table, writer)
+}