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verflag.go
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verflag.go
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package verflag
import (
"fmt"
"os"
"strconv"
flag "github.com/spf13/pflag"
"github.com/clusterpedia-io/clusterpedia/pkg/version"
)
// copy from k8s.io/component-base/version/verflag/verflag.go
type versionValue int
const (
VersionFalse versionValue = 0
VersionTrue versionValue = 1
VersionRaw versionValue = 2
)
const strRawVersion string = "raw"
func (v *versionValue) IsBoolFlag() bool {
return true
}
func (v *versionValue) Get() interface{} {
return versionValue(*v)
}
func (v *versionValue) Set(s string) error {
if s == strRawVersion {
*v = VersionRaw
return nil
}
boolVal, err := strconv.ParseBool(s)
if boolVal {
*v = VersionTrue
} else {
*v = VersionFalse
}
return err
}
func (v *versionValue) String() string {
if *v == VersionRaw {
return strRawVersion
}
return fmt.Sprintf("%v", bool(*v == VersionTrue))
}
// The type of the flag as required by the pflag.Value interface
func (v *versionValue) Type() string {
return "version"
}
func VersionVar(p *versionValue, name string, value versionValue, usage string) {
*p = value
flag.Var(p, name, usage)
// "--version" will be treated as "--version=true"
flag.Lookup(name).NoOptDefVal = "true"
}
func Version(name string, value versionValue, usage string) *versionValue {
p := new(versionValue)
VersionVar(p, name, value, usage)
return p
}
const versionFlagName = "version"
var (
programName = "Clusterpedia"
versionFlag = Version(versionFlagName, VersionFalse, "Print version information and quit")
)
func AddFlags(fs *flag.FlagSet) {
fs.AddFlag(flag.Lookup(versionFlagName))
}
func PrintAndExitIfRequested() {
switch *versionFlag {
case VersionRaw:
fmt.Printf("%#v\n", version.Get())
case VersionTrue:
fmt.Printf("%s %s\n", programName, version.Get())
default:
return
}
os.Exit(0)
}