begin wiring printflags through set cmds

pkg/printers/flags.go

@@ -0,0 +1,85 @@
+/*
+Copyright 2018 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 printers
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+type NoCompatiblePrinterError struct {
+	options interface{}
+}
+
+func (e NoCompatiblePrinterError) Error() string {
+	return fmt.Sprintf("unable to match a printer suitable for the options specified: %#v", e.options)
+}
+
+func IsNoCompatiblePrinterError(err error) bool {
+	_, ok := err.(NoCompatiblePrinterError)
+	return ok
+}
+
+// PrintFlags composes common printer flag structs
+// used across all commands, and provides a method
+// of retrieving a known printer based on flag values provided.
+type PrintFlags struct {
+	JSONYamlPrintFlags *JSONYamlPrintFlags
+	NamePrintFlags     *NamePrintFlags
+
+	OutputFormat *string
+}
+
+func (f *PrintFlags) Complete(dryRun bool) error {
+	f.NamePrintFlags.DryRun = dryRun
+	return nil
+}
+
+func (f *PrintFlags) ToPrinter() (ResourcePrinter, error) {
+	outputFormat := ""
+	if f.OutputFormat != nil {
+		outputFormat = *f.OutputFormat
+	}
+
+	p, err := f.JSONYamlPrintFlags.ToPrinter(outputFormat)
+	if err == nil {
+		return p, nil
+	}
+
+	return f.NamePrintFlags.ToPrinter(outputFormat)
+}
+
+func (f *PrintFlags) AddFlags(cmd *cobra.Command) {
+	f.JSONYamlPrintFlags.AddFlags(cmd)
+	f.NamePrintFlags.AddFlags(cmd)
+
+	if f.OutputFormat != nil {
+		cmd.Flags().StringVarP(f.OutputFormat, "output", "o", *f.OutputFormat, "Output format. One of: json|yaml|wide|name|custom-columns=...|custom-columns-file=...|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=... See custom columns [http://kubernetes.io/docs/user-guide/kubectl-overview/#custom-columns], golang template [http://golang.org/pkg/text/template/#pkg-overview] and jsonpath template [http://kubernetes.io/docs/user-guide/jsonpath].")
+	}
+}
+
+func NewPrintFlags(operation string) *PrintFlags {
+	outputFormat := ""
+
+	return &PrintFlags{
+		OutputFormat: &outputFormat,
+
+		JSONYamlPrintFlags: NewJSONYamlPrintFlags(),
+		NamePrintFlags:     NewNamePrintFlags(operation, false),
+	}
+}