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flag.go
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flag.go
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package version
import (
"fmt"
"os"
"strconv"
flag "github.com/spf13/pflag"
)
type versionValue bool
const (
VersionFalse versionValue = false
VersionTrue versionValue = true
)
func (v *versionValue) IsBoolFlag() bool {
return true
}
func (v *versionValue) Get() interface{} {
return v
}
func (v *versionValue) String() string {
return fmt.Sprintf("%v", bool(*v == VersionTrue))
}
func (v *versionValue) Set(s string) error {
boolVar, err := strconv.ParseBool(s)
if boolVar {
*v = VersionTrue
} else {
*v = VersionFalse
}
return err
}
func (v *versionValue) Type() string {
return "version"
}
const versionFlagName = "version"
var versionFLag = Version(versionFlagName, VersionFalse, "Print Version information and quit.")
func Version(name string, value versionValue, usage string) *versionValue {
p := new(versionValue)
*p = value
flag.Var(p, name, usage)
flag.Lookup(name).NoOptDefVal = "true"
return p
}
func PrintAndExitIfRequested() {
if *versionFLag == VersionTrue {
fmt.Printf("%s\n", Get())
os.Exit(0)
}
}