package loop

import (
	"bufio"
	"fmt"
	"io"
)

type PromptReader interface {
	Read() (string, error)
}

type IOReaderPromptReader struct {
	s *bufio.Scanner
}

func NewIOReaderPromptReader(r io.Reader) *IOReaderPromptReader {
	return &IOReaderPromptReader{
		s: bufio.NewScanner(r),
	}
}

func (r IOReaderPromptReader) Read() (string, error) {
	if !r.s.Scan() {
		return "", fmt.Errorf("done")
	}
	return r.s.Text(), nil
}