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flag: add a Value example
Change-Id: I579cc9f4f8e5be5fd6447a99614797ab7bc53611 Reviewed-on: https://go-review.googlesource.com/120175 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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src/flag/example_value_test.go
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44
src/flag/example_value_test.go
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package flag_test
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import (
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"flag"
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"fmt"
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"net/url"
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)
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type URLValue struct {
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URL *url.URL
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}
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func (v URLValue) String() string {
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if v.URL != nil {
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return v.URL.String()
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}
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return ""
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}
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func (v URLValue) Set(s string) error {
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if u, err := url.Parse(s); err != nil {
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return err
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} else {
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*v.URL = *u
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}
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return nil
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}
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var u = &url.URL{}
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func ExampleValue() {
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fs := flag.NewFlagSet("ExampleValue", flag.ExitOnError)
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fs.Var(&URLValue{u}, "url", "URL to parse")
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fs.Parse([]string{"-url", "https://golang.org/pkg/flag/"})
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fmt.Printf(`{scheme: %q, host: %q, path: %q}`, u.Scheme, u.Host, u.Path)
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// Output:
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// {scheme: "https", host: "golang.org", path: "/pkg/flag/"}
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}
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