package cli

import (
	"fmt"
	"os"
	"strings"
)

type FlagStringArray []string

func (array *FlagStringArray) String() string {
	return strings.Join(*array, ", ")
}

func (array *FlagStringArray) Set(s string) error {
	*array = append(*array, s)
	return nil
}

type FileList FlagStringArray

func (fileList FileList) Strings() []string {
	return ([]string)(fileList)
}

func (fileList *FileList) String() string {
	return (*FlagStringArray)(fileList).String()
}

func (fileList *FileList) Set(s string) error {
	if _, err := os.Stat(s); os.IsNotExist(err) {
		return fmt.Errorf("file does not exist: %s", s)
	}
	return (*FlagStringArray)(fileList).Set(s)
}