An example of parsing a repeated argument like '-vvv' with kingpin

kingpin_repeat_arg_example.go

package main

import (
    "fmt"

    "gopkg.in/alecthomas/kingpin.v2"
)

var (
    verbose = kingpin.Flag("verbose", "Enable verbose mode.").Short('v').Counter()
)

func main() {
    kingpin.Version("0.0.1")
    kingpin.Parse()
    fmt.Printf("verbose=%v\n", *verbose)
}

$ go run kingpin_repeat_arg_example.go
verbose=0
$ go run kingpin_repeat_arg_example.go -v
verbose=1
$ go run kingpin_repeat_arg_example.go -vv
verbose=2
$ go run kingpin_repeat_arg_example.go -vvv
verbose=3