Kingpin multiple filters

main.go

package main

import (
	"fmt"

  "github.com/davecgh/go-spew/spew"
  "gopkg.in/alecthomas/kingpin.v2"
)

type Config struct {
    filters ec2Filters
}

type filters []string

func (t *filters) Set(value string) error {
	*t = append(*t, value)
	return nil
}

func (t *filters) IsCumulative() bool {
  return true
}

func (t *filters) String() string {
	return fmt.Sprint([]string(*t))
}

func (t *filters) Type() string {
	return ""
}

func Filters(s Settings) (filters *[]string) {
  filters = make([]string, 0)
  s.SetValue((*ifilters)(filters))
  return
}

func main() {
	cfg := &Config{
        filters: Filters(kingpin.Arg("filters", "A set of filters."))
	}
	kingpin.UsageTemplate(kingpin.CompactUsageTemplate)
	kingpin.Parse()

	spew.Dump(cfg)
}