github.com/bishtawi/migrate/v4@v4.8.11/internal/url/url.go (about)

     1  package url
     2  
     3  import (
     4  	"errors"
     5  	"strings"
     6  )
     7  
     8  var errNoScheme = errors.New("no scheme")
     9  var errEmptyURL = errors.New("URL cannot be empty")
    10  
    11  // schemeFromURL returns the scheme from a URL string
    12  func SchemeFromURL(url string) (string, error) {
    13  	if url == "" {
    14  		return "", errEmptyURL
    15  	}
    16  
    17  	i := strings.Index(url, ":")
    18  
    19  	// No : or : is the first character.
    20  	if i < 1 {
    21  		return "", errNoScheme
    22  	}
    23  
    24  	return url[0:i], nil
    25  }