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package main
import (
"errors"
"strings"
)
var errMultiStringSetEmptyValue = errors.New("value cannot be empty")
const defaultSeparator = ","
// MultiStringFlag implements the flag.Value interface and allows a string flag
// to be specified multiple times on the command line.
//
// e.g.: -listen-http 127.0.0.1:80 -listen-http [::1]:80
type MultiStringFlag struct {
value []string
separator string
}
// String returns the list of parameters joined with a commas (",")
func (s *MultiStringFlag) String() string {
return strings.Join(s.value, s.sep())
}
// Set appends the value to the list of parameters
func (s *MultiStringFlag) Set(value string) error {
if value == "" {
return errMultiStringSetEmptyValue
}
s.value = append(s.value, value)
return nil
}
// Split each flag
func (s *MultiStringFlag) Split() (result []string) {
for _, str := range s.value {
result = append(result, strings.Split(str, s.sep())...)
}
return
}
func (s *MultiStringFlag) sep() string {
if s.separator == "" {
return defaultSeparator
}
return s.separator
}
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