package dsnet

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

func check(e error) {
    if e != nil {
        panic(e)
    }
}

func MustPromptString(prompt string, required bool) string {
	reader := bufio.NewReader(os.Stdin)
	var text string
	var err error

	for text == "" {
		fmt.Printf("%s: ", prompt)
		text, err = reader.ReadString('\n')
		check(err)
		text = strings.TrimSpace(text)
	}
	return text
}

func ExitFail(format string, a ...interface{}) {
	fmt.Fprintf(os.Stderr, "\033[31m"+format+"\033[0m\n", a...)
	os.Exit(1)
}

func ConfirmOrAbort(format string, a ...interface{}) {
	fmt.Fprintf(os.Stderr, format+" [y/n] ", a...)

	reader := bufio.NewReader(os.Stdin)

	input, err := reader.ReadString('\n')
	if err != nil {
		panic(err)
	}

	if input == "y\n" {
		return
	} else {
		ExitFail("Aborted.")
	}
}