func GenFromURL(urlstr string) func(*URL) (string, error) {
	z, err := url.Parse(urlstr)
	if err != nil {
		panic(err)
	}

	return func(u *URL) (string, error) {
		opaque := z.Opaque
		if u.Opaque != "" {
			opaque = u.Opaque
		}

		user := z.User
		if u.User != nil {
			user = u.User
		}

		host, port := hostname(z.Host), hostport(z.Host)
		if h := hostname(u.Host); h != "" {
			host = h
		}
		if p := hostport(u.Host); p != "" {
			port = p
		}
		if port != "" {
			host += ":" + port
		}

		path := z.Path
		if u.Path != "" {
			path = u.Path
		}

		rawPath := z.RawPath
		if u.RawPath != "" {
			rawPath = u.RawPath
		}

		q := z.Query()
		for k, v := range u.Query() {
			q.Set(k, strings.Join(v, " "))
		}

		fragment := z.Fragment
		if u.Fragment != "" {
			fragment = u.Fragment
		}

		y := &url.URL{
			Scheme:   z.Scheme,
			Opaque:   opaque,
			User:     user,
			Host:     host,
			Path:     path,
			RawPath:  rawPath,
			RawQuery: q.Encode(),
			Fragment: fragment,
		}

		return y.String(), nil
	}
}
func GenFromURL(urlstr string) func(*URL) (string, error) {
	z, err := url.Parse(urlstr)
	if err != nil {
		panic(err)
	}

	return func(u *URL) (string, error) {
		opaque := z.Opaque
		if u.Opaque != "" {
			opaque = u.Opaque
		}

		user := z.User
		if u.User != nil {
			user = u.User
		}

		host, port := hostname(z.Host), hostport(z.Host)
		if h := hostname(u.Host); h != "" {
			host = h
		}
		if p := hostport(u.Host); p != "" {
			port = p
		}
		if port != "" {
			host += ":" + port
		}

		path := z.Path
		if u.Path != "" {
			path = u.Path
		}

		rawPath := z.RawPath
		if u.RawPath != "" {
			rawPath = u.RawPath
		}

		q := z.Query()
		for k, v := range u.Query() {
			q.Set(k, strings.Join(v, " "))
		}

		fragment := z.Fragment
		if u.Fragment != "" {
			fragment = u.Fragment
		}

		y := &url.URL{
			Scheme:   z.Scheme,
			Opaque:   opaque,
			User:     user,
			Host:     host,
			Path:     path,
			RawPath:  rawPath,
			RawQuery: q.Encode(),
			Fragment: fragment,
		}

		return y.String(), nil
	}
}
func GenFromURL ( urlstr string ) func ( * URL ) ( string , error ) { z , err := url . Parse ( urlstr ) if err != nil { panic ( err ) } return func ( u * URL ) ( string , error ) { opaque := z . Opaque if u . Opaque != " " { opaque = u . Opaque } user := z . User if u . User != nil { user = u . User } host , port := hostname ( z . Host ) , hostport ( z . Host ) if h := hostname ( u . Host ) ; h != " " { host = h } if p := hostport ( u . Host ) ; p != " " { port = p } if port != " " { host += " " + port } path := z . Path if u . Path != " " { path = u . Path } rawPath := z . RawPath if u . RawPath != " " { rawPath = u . RawPath } q := z . Query ( ) for k , v := range u . Query ( ) { q . Set ( k , strings . Join ( v , " " ) ) } fragment := z . Fragment if u . Fragment != " " { fragment = u . Fragment } y := & url . URL { Scheme : z . Scheme , Opaque : opaque , User : user , Host : host , Path : path , RawPath : rawPath , RawQuery : q . Encode ( ) , Fragment : fragment , } return y . String ( ) , nil } }
// GenFromURL returns a func that generates a DSN using urlstr as the default
// URL parameters, overriding the values only if when in the passed URL.
GenFromURL returns a func that generates a DSN using urlstr as the default URL parameters overriding the values only if when in the passed URL .