package logger

import (
	"bytes"
	"io"
	"regexp"
)

var regexpMultiWhitespace = regexp.MustCompile(`[\s\p{Zs}]{2,}`)

func peek(r io.Reader, n int64) (io.Reader, string, bool, error) {
	if n < 0 {
		n = 0
	}

	var buf bytes.Buffer
	_, err := io.CopyN(&buf, r, n+1)

	if err == io.EOF {
		return &buf, buf.String(), false, nil
	}

	if err != nil {
		return nil, "", false, err
	}

	s := buf.String()
	s = s[:len(s)-1]

	return io.MultiReader(&buf, r), s, true, nil
}