Add support for url.URL

bind.go

@@ -93,6 +93,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"net/url"
 	"reflect"
 	"strings"
 	"time"
@@ -396,6 +397,9 @@ func (b bind) bind(fs FlagSet, v interface{}) (err error) {
 		_, isBinder := fieldI.(Binder)
 
 		_, isFlagValue := fieldI.(flag.Value)
+		_, isJSONRawMessage := fieldI.(*json.RawMessage)
+		_, isURL := fieldI.(*url.URL)
+		isFlagValue = isFlagValue || isJSONRawMessage || isURL
 
 		isStruct := fieldT.Kind() == reflect.Struct
 
@@ -530,6 +534,8 @@ func bindSTDFlag(fs STDFlagSet, tag flagTag, p interface{}) bool {
 		fs.Var(p, tag.Name, tag.Usage)
 	case *json.RawMessage:
 		fs.Var((*JSONRawMessage)(p), tag.Name, tag.Usage)
+	case *url.URL:
+		fs.Var((*URL)(p), tag.Name, tag.Usage)
 	case *bool:
 		val := *p
 		fs.BoolVar(p, tag.Name, val, tag.Usage)
@@ -580,6 +586,8 @@ func bindPFlag(fs PFlagSet, tag flagTag, p interface{}, typeName string) bool {
 		f = fs.VarPF(pp, tag.Name, tag.ShortName, tag.Usage)
 	case *json.RawMessage:
 		f = fs.VarPF((*JSONRawMessage)(p), tag.Name, tag.ShortName, tag.Usage)
+	case *url.URL:
+		f = fs.VarPF((*URL)(p), tag.Name, tag.ShortName, tag.Usage)
 	case *bool:
 		val := *p
 		fs.BoolVarP(p, tag.Name, tag.ShortName, val, tag.Usage)

bind_test.go

@@ -27,6 +27,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"testing"
 	"time"
 
@@ -202,6 +203,9 @@ type ValidTestFlags struct {
 
 	ExportedInterface interface{}
 
+	CustomURLPtr *url.URL
+	CustomURL    url.URL
+
 	custom bool
 }
 
@@ -287,6 +291,10 @@ var tests = []BindTest{
 			"-struct-b-bool",
 			"-nested-struct-a-bool",
 			"-embedded-struct-b-bool",
+			"-custom-url",
+			"http://example.com",
+			"-custom-url-ptr",
+			"http://example.com",
 			"-custom",
 		},
 		ExpF: &ValidTestFlags{
@@ -327,6 +335,11 @@ var tests = []BindTest{
 			NestedFlat:   StructB{true},
 			StructA:      StructA{true, false},
 			StructB:      StructB{true},
+			CustomURL: func() url.URL {
+				u := mustParseURL("http://example.com")
+				return *u
+			}(),
+			CustomURLPtr: mustParseURL("http://example.com"),
 			custom:       true,
 		},
 	}, {
@@ -436,3 +449,11 @@ var tests = []BindTest{
 		}{http.Client{Timeout: 5 * time.Second}},
 	},
 }
+
+func mustParseURL(rawurl string) *url.URL {
+	u, err := url.Parse(rawurl)
+	if err != nil {
+		panic(err)
+	}
+	return u
+}

url.go

@@ -0,0 +1,20 @@
+package flagbind
+
+import "net/url"
+
+type URL url.URL
+
+func (u *URL) Set(text string) error {
+	_u, err := url.Parse(text)
+	if err != nil {
+		return err
+	}
+	*u = (URL)(*_u)
+	return nil
+}
+
+func (u URL) String() string {
+	return (*url.URL)(&u).String()
+}
+
+func (u URL) Type() string { return "URL" }