Source File
	url.go

Belonging Package
	github.com/golang-migrate/migrate/v4/internal/url

package url

import (
	"errors"
	"strings"
)

var errNoScheme = errors.New("no scheme")
var errEmptyURL = errors.New("URL cannot be empty")

func SchemeFromURL(url string) (string, error) {
	if url == "" {
		return "", errEmptyURL
	}

	i := strings.Index(url, ":")

	if i < 1 {
		return "", errNoScheme
	}

	return url[0:i], nil

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