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// Copyright 2015 The etcd 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.
// copied from https://github.com/rkt/rkt/blob/master/rkt/help.go
package runner
import (
"bytes"
"fmt"
"io"
"os"
"strings"
"text/tabwriter"
"text/template"
"go.etcd.io/etcd/api/v3/version"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
var (
commandUsageTemplate *template.Template
templFuncs = template.FuncMap{
"descToLines": func(s string) []string {
// trim leading/trailing whitespace and split into slice of lines
return strings.Split(strings.Trim(s, "\n\t "), "\n")
},
"cmdName": func(cmd *cobra.Command, startCmd *cobra.Command) string {
parts := []string{cmd.Name()}
for cmd.HasParent() && cmd.Parent().Name() != startCmd.Name() {
cmd = cmd.Parent()
parts = append([]string{cmd.Name()}, parts...)
}
return strings.Join(parts, " ")
},
}
)
func init() {
commandUsage := `
{{ $cmd := .Cmd }}\
{{ $cmdname := cmdName .Cmd .Cmd.Root }}\
NAME:
{{ if not .Cmd.HasParent }}\
{{printf "\t%s - %s" .Cmd.Name .Cmd.Short}}
{{else}}\
{{printf "\t%s - %s" $cmdname .Cmd.Short}}
{{end}}\
USAGE:
{{printf "\t%s" .Cmd.UseLine}}
{{ if not .Cmd.HasParent }}\
VERSION:
{{printf "\t%s" .Version}}
{{end}}\
{{if .Cmd.HasSubCommands}}\
API VERSION:
{{printf "\t%s" .APIVersion}}
{{end}}\
{{if .Cmd.HasSubCommands}}\
COMMANDS:
{{range .SubCommands}}\
{{ $cmdname := cmdName . $cmd }}\
{{ if .Runnable }}\
{{printf "\t%s\t%s" $cmdname .Short}}
{{end}}\
{{end}}\
{{end}}\
{{ if .Cmd.Long }}\
DESCRIPTION:
{{range $line := descToLines .Cmd.Long}}{{printf "\t%s" $line}}
{{end}}\
{{end}}\
{{if .Cmd.HasLocalFlags}}\
OPTIONS:
{{.LocalFlags}}\
{{end}}\
{{if .Cmd.HasInheritedFlags}}\
GLOBAL OPTIONS:
{{.GlobalFlags}}\
{{end}}
`[1:]
commandUsageTemplate = template.Must(template.New("command_usage").Funcs(templFuncs).Parse(strings.Replace(commandUsage, "\\\n", "", -1)))
}
func etcdFlagUsages(flagSet *pflag.FlagSet) string {
x := new(bytes.Buffer)
flagSet.VisitAll(func(flag *pflag.Flag) {
if len(flag.Deprecated) > 0 {
return
}
var format string
if len(flag.Shorthand) > 0 {
format = " -%s, --%s"
} else {
format = " %s --%s"
}
if len(flag.NoOptDefVal) > 0 {
format = format + "["
}
if flag.Value.Type() == "string" {
// put quotes on the value
format = format + "=%q"
} else {
format = format + "=%s"
}
if len(flag.NoOptDefVal) > 0 {
format = format + "]"
}
format = format + "\t%s\n"
shorthand := flag.Shorthand
fmt.Fprintf(x, format, shorthand, flag.Name, flag.DefValue, flag.Usage)
})
return x.String()
}
func getSubCommands(cmd *cobra.Command) []*cobra.Command {
var subCommands []*cobra.Command
for _, subCmd := range cmd.Commands() {
subCommands = append(subCommands, subCmd)
subCommands = append(subCommands, getSubCommands(subCmd)...)
}
return subCommands
}
func usageFunc(cmd *cobra.Command) error {
subCommands := getSubCommands(cmd)
tabOut := getTabOutWithWriter(os.Stdout)
commandUsageTemplate.Execute(tabOut, struct {
Cmd *cobra.Command
LocalFlags string
GlobalFlags string
SubCommands []*cobra.Command
Version string
APIVersion string
}{
cmd,
etcdFlagUsages(cmd.LocalFlags()),
etcdFlagUsages(cmd.InheritedFlags()),
subCommands,
version.Version,
version.APIVersion,
})
tabOut.Flush()
return nil
}
func getTabOutWithWriter(writer io.Writer) *tabwriter.Writer {
aTabOut := new(tabwriter.Writer)
aTabOut.Init(writer, 0, 8, 1, '\t', 0)
return aTabOut
}
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