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112 lines
3.4 KiB
Go
112 lines
3.4 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package get
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import (
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"fmt"
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"os"
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"strings"
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"github.com/spf13/cobra"
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"k8s.io/cli-runtime/pkg/genericclioptions"
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"k8s.io/cli-runtime/pkg/genericclioptions/printers"
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"k8s.io/kubernetes/pkg/kubectl/scheme"
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)
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var columnsFormats = map[string]bool{
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"custom-columns-file": true,
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"custom-columns": true,
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}
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// CustomColumnsPrintFlags provides default flags necessary for printing
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// custom resource columns from an inline-template or file.
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type CustomColumnsPrintFlags struct {
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NoHeaders bool
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TemplateArgument string
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}
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func (f *CustomColumnsPrintFlags) AllowedFormats() []string {
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formats := make([]string, 0, len(columnsFormats))
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for format := range columnsFormats {
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formats = append(formats, format)
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}
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return formats
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}
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// ToPrinter receives an templateFormat and returns a printer capable of
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// handling custom-column printing.
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// Returns false if the specified templateFormat does not match a supported format.
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// Supported format types can be found in pkg/printers/printers.go
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func (f *CustomColumnsPrintFlags) ToPrinter(templateFormat string) (printers.ResourcePrinter, error) {
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if len(templateFormat) == 0 {
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return nil, genericclioptions.NoCompatiblePrinterError{}
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}
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templateValue := ""
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if len(f.TemplateArgument) == 0 {
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for format := range columnsFormats {
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format = format + "="
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if strings.HasPrefix(templateFormat, format) {
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templateValue = templateFormat[len(format):]
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templateFormat = format[:len(format)-1]
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break
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}
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}
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} else {
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templateValue = f.TemplateArgument
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}
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if _, supportedFormat := columnsFormats[templateFormat]; !supportedFormat {
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return nil, genericclioptions.NoCompatiblePrinterError{OutputFormat: &templateFormat, AllowedFormats: f.AllowedFormats()}
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}
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if len(templateValue) == 0 {
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return nil, fmt.Errorf("custom-columns format specified but no custom columns given")
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}
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// UniversalDecoder call must specify parameter versions; otherwise it will decode to internal versions.
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decoder := scheme.Codecs.UniversalDecoder(scheme.Scheme.PrioritizedVersionsAllGroups()...)
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if templateFormat == "custom-columns-file" {
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file, err := os.Open(templateValue)
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if err != nil {
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return nil, fmt.Errorf("error reading template %s, %v\n", templateValue, err)
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}
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defer file.Close()
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p, err := NewCustomColumnsPrinterFromTemplate(file, decoder)
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return p, err
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}
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return NewCustomColumnsPrinterFromSpec(templateValue, decoder, f.NoHeaders)
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}
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// AddFlags receives a *cobra.Command reference and binds
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// flags related to custom-columns printing
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func (f *CustomColumnsPrintFlags) AddFlags(c *cobra.Command) {}
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// NewCustomColumnsPrintFlags returns flags associated with
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// custom-column printing, with default values set.
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// NoHeaders and TemplateArgument should be set by callers.
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func NewCustomColumnsPrintFlags() *CustomColumnsPrintFlags {
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return &CustomColumnsPrintFlags{
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NoHeaders: false,
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TemplateArgument: "",
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}
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}
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