packer-cn/helper/flag-kv/flag.go

30 lines
514 B
Go

package kvflag
import (
"fmt"
"strings"
)
// Flag is a flag.Value implementation for parsing user variables
// from the command-line in the format of '-var key=value'.
type Flag map[string]string
func (v *Flag) String() string {
return ""
}
func (v *Flag) Set(raw string) error {
idx := strings.Index(raw, "=")
if idx == -1 {
return fmt.Errorf("No '=' value in arg: %s", raw)
}
if *v == nil {
*v = make(map[string]string)
}
key, value := raw[0:idx], raw[idx+1:]
(*v)[key] = value
return nil
}