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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package flag_test
import (
"flag"
"fmt"
"net/url"
)
type URLValue struct {
URL *url.URL
}
func (v URLValue) String() string {
if v.URL != nil {
return v.URL.String()
}
return ""
}
func (v URLValue) Set(s string) error {
if u, err := url.Parse(s); err != nil {
return err
} else {
*v.URL = *u
}
return nil
}
var u = &url.URL{}
func ExampleValue() {
fs := flag.NewFlagSet("ExampleValue", flag.ExitOnError)
fs.Var(&URLValue{u}, "url", "URL to parse")
fs.Parse([]string{"-url", "https://golang.org/pkg/flag/"})
fmt.Printf(`{scheme: %q, host: %q, path: %q}`, u.Scheme, u.Host, u.Path)
// Output:
// {scheme: "https", host: "golang.org", path: "/pkg/flag/"}
}
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