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verflag.go
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verflag.go
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// Package verflag defines utility functions to handle command line flags
package verflag
import (
"fmt"
"os"
"strconv"
flag "github.com/spf13/pflag"
"github.com/bingo-project/component-base/version"
)
type versionValue int
// Define some const.
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 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))
}
// Type of the flag as required by the pflag.Value interface.
func (v *versionValue) Type() string {
return "version"
}
// VersionVar defines a flag with the specified name and usage string.
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"
}
// Version wraps the VersionVar function.
func Version(name string, value versionValue, usage string) *versionValue {
p := new(versionValue)
VersionVar(p, name, value, usage)
return p
}
const versionFlagName = "version"
var versionFlag = Version(versionFlagName, VersionFalse, "Print version information and quit.")
// AddFlags registers this package's flags on arbitrary FlagSets, such that they point to the
// same value as the global flags.
func AddFlags(fs *flag.FlagSet) {
fs.AddFlag(flag.Lookup(versionFlagName))
}
// PrintAndExitIfRequested will check if the -version flag was passed
// and, if so, print the version and exit.
func PrintAndExitIfRequested() {
if *versionFlag == VersionRaw {
fmt.Printf("%#v\n", version.Get())
os.Exit(0)
} else if *versionFlag == VersionTrue {
fmt.Printf("%s\n", version.Get())
os.Exit(0)
}
}