main.go

package main

import (
	"crypto/rand"
	"encoding/base64"
	"errors"
	"flag"
	"fmt"
	"strings"
)

var prefix = flag.String("prefix", "hackDalton", "used as the prefix for the flag")
var mapVowels = flag.Bool("mapVowels", true, "determines if vowels are mapped to numbers.")

var vowelMap = map[string]string{
	"a": "4",
	"e": "3",
	"i": "1",
	"o": "0",
}

func main() {
	flag.Parse()

	if flag.NArg() < 1 {
		panic(errors.New("Invalid arguments"))
	}

	description := flag.Arg(0)

	fmt.Println(GenerateFlag(description, *prefix, *mapVowels))
}

// GenerateFlag generates a flag with the given description
func GenerateFlag(description, prefix string, mapvowels bool) string {
	description = strings.ToLower(description)
	description = strings.ReplaceAll(description, " ", "_")

	if *mapVowels {
		for oldChar, newChar := range vowelMap {
			description = strings.ReplaceAll(description, oldChar, newChar)
		}
	}

	str, err := generateRandomString(10)
	if err != nil {
		panic(err)
	}

	return prefix + "{" + description + "_" + str + "}"
}

func generateRandomBytes(n int) ([]byte, error) {
	b := make([]byte, n)
	_, err := rand.Read(b)
	// Note that err == nil only if we read len(b) bytes.
	if err != nil {
		return nil, err
	}

	return b, nil
}

func generateRandomString(s int) (string, error) {
	b, err := generateRandomBytes(s)
	return base64.URLEncoding.EncodeToString(b)[:s], err
}