121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
/*
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Copyright 2017 the Heptio Ark contributors.
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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 output
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import (
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"bytes"
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"fmt"
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"sort"
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"strings"
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"text/tabwriter"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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type Describer struct {
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Prefix string
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out *tabwriter.Writer
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buf *bytes.Buffer
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}
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func Describe(fn func(d *Describer)) string {
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d := Describer{
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out: new(tabwriter.Writer),
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buf: new(bytes.Buffer),
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}
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d.out.Init(d.buf, 0, 8, 2, ' ', 0)
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fn(&d)
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d.out.Flush()
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return d.buf.String()
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}
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func (d *Describer) Printf(msg string, args ...interface{}) {
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fmt.Fprint(d.out, d.Prefix)
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fmt.Fprintf(d.out, msg, args...)
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}
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func (d *Describer) Println(args ...interface{}) {
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fmt.Fprint(d.out, d.Prefix)
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fmt.Fprintln(d.out, args...)
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}
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// DescribeMetadata describes standard object metadata in a consistent manner.
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func (d *Describer) DescribeMetadata(metadata metav1.ObjectMeta) {
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d.Printf("Name:\t%s\n", metadata.Name)
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d.Printf("Namespace:\t%s\n", metadata.Namespace)
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d.DescribeMap("Labels", metadata.Labels)
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d.DescribeMap("Annotations", metadata.Annotations)
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}
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// DescribeMap describes a map of key-value pairs using name as the heading.
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func (d *Describer) DescribeMap(name string, m map[string]string) {
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d.Printf("%s:\t", name)
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first := true
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prefix := ""
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if len(m) > 0 {
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keys := make([]string, 0, len(m))
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for key := range m {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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for _, key := range keys {
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d.Printf("%s%s=%s\n", prefix, key, m[key])
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if first {
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first = false
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prefix = "\t"
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}
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}
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} else {
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d.Printf("<none>\n")
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}
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}
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// DescribeSlice describes a slice of strings using name as the heading. The output is prefixed by
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// "preindent" number of tabs.
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func (d *Describer) DescribeSlice(preindent int, name string, s []string) {
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pretab := strings.Repeat("\t", preindent)
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d.Printf("%s%s:\t", pretab, name)
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first := true
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prefix := ""
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if len(s) > 0 {
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for _, x := range s {
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d.Printf("%s%s\n", prefix, x)
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if first {
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first = false
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prefix = pretab + "\t"
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}
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}
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} else {
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d.Printf("%s<none>\n", pretab)
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}
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}
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// BoolPointerString returns the appropriate string based on the bool pointer's value.
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func BoolPointerString(b *bool, falseString, trueString, nilString string) string {
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if b == nil {
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return nilString
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}
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if *b {
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return trueString
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}
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return falseString
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}
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