Added quotes to names in address headers

Closes #23.

gomail.go

@@ -134,7 +134,12 @@ func (msg *Message) SetAddressHeader(field, address, name string) {
 
 // FormatAddress formats an address and a name as a valid RFC 5322 address.
 func (msg *Message) FormatAddress(address, name string) string {
-	return msg.encodeHeader(name) + " <" + address + ">"
+	n := msg.encodeHeader(name)
+	if n == name {
+		n = quote(name)
+	}
+
+	return n + " <" + address + ">"
 }
 
 // SetDateHeader sets a date to the given header field.
@@ -269,3 +274,16 @@ func (msg *Message) Embed(image ...*File) {
 
 // Stubbed out for testing.
 var readFile = ioutil.ReadFile
+
+func quote(text string) string {
+	buf := bytes.NewBufferString(`"`)
+	for i := 0; i < len(text); i++ {
+		if text[i] == '\\' || text[i] == '"' {
+			buf.WriteByte('\\')
+		}
+		buf.WriteByte(text[i])
+	}
+	buf.WriteByte('"')
+
+	return buf.String()
+}

gomail_test.go

@@ -21,6 +21,7 @@ func TestMessage(t *testing.T) {
 	msg := NewMessage()
 	msg.SetAddressHeader("From", "from@example.com", "Señor From")
 	msg.SetHeader("To", msg.FormatAddress("to@example.com", "Señor To"), "tobis@example.com")
+	msg.SetAddressHeader("Cc", "cc@example.com", "A, B")
 	msg.SetDateHeader("X-Date", stubNow())
 	msg.SetHeader("X-Date-2", msg.FormatDate(stubNow()))
 	msg.SetHeader("Subject", "¡Hola, señor!")
@@ -34,9 +35,11 @@ func TestMessage(t *testing.T) {
 		to: []string{
 			"to@example.com",
 			"tobis@example.com",
+			"cc@example.com",
 		},
 		content: "From: =?UTF-8?Q?Se=C3=B1or_From?= <from@example.com>\r\n" +
 			"To: =?UTF-8?Q?Se=C3=B1or_To?= <to@example.com>, tobis@example.com\r\n" +
+			"Cc: \"A, B\" <cc@example.com>\r\n" +
 			"X-Date: Wed, 25 Jun 2014 17:46:00 +0000\r\n" +
 			"X-Date-2: Wed, 25 Jun 2014 17:46:00 +0000\r\n" +
 			"X-Headers: Test, =?UTF-8?Q?Caf=C3=A9?=\r\n" +