BauCH :o)

bauch.go

package main

import (
	"fmt"
	"math/rand"
	"os"
	"strings"
	"time"
	"unicode"
)

const maxLen = 4

func main() {
	rand.Seed(int64(time.Now().Nanosecond()))
	if len(os.Args) < 2 {
		fmt.Println("uSAgE: bauch Nachricht in Nicht-Bauch-Format")
		os.Exit(2)
	}
	input := strings.Join(os.Args[1:], " ")
	output := make([]rune, len(input))
	nUpper := 0
	i := -1
	for _, c := range input {
		i++
		if !unicode.IsLetter(c) {
			output[i] = c
			continue
		}
		if rand.Intn(2*maxLen) > maxLen+nUpper {
			output[i] = unicode.ToUpper(c)
			if nUpper >= 0 {
				nUpper++
			} else {
				nUpper = 0
			}
		} else {
			output[i] = unicode.ToLower(c)
			if nUpper <= 0 {
				nUpper--
			} else {
				nUpper = 0
			}
		}
	}
	output = output[:i+1]
	fmt.Println(string(output), ":o)")
}