refactor: Identifier.SetID -> Identifier.SetName

Identifier.ID() is now read-only and derived from name.

.gitignore

@@ -1,4 +1,5 @@
 /build
+/vendor
 host_key
 host_key.pub
 ssh-chat

chat/command.go

@@ -156,10 +156,10 @@ func InitCommands(c *Commands) {
 			}
 
 			oldID := member.ID()
-			member.SetID(SanitizeName(args[0]))
+			member.SetName(args[0])
 			err := room.Rename(oldID, member)
 			if err != nil {
-				member.SetID(oldID)
+				member.SetName(oldID)
 				return err
 			}
 			return nil

chat/member.go

@@ -13,9 +13,9 @@ type roomMember struct {
 
 type Member interface {
 	ID() string
-	SetID(string)
 
 	Name() string
+	SetName(string)
 
 	Config() message.UserConfig
 	SetConfig(message.UserConfig)

chat/message/identity.go

@@ -3,8 +3,8 @@ package message
 // Identifier is an interface that can uniquely identify itself.
 type Identifier interface {
 	ID() string
-	SetID(string)
 	Name() string
+	SetName(string)
 }
 
 // SimpleID is a simple Identifier implementation used for testing.
@@ -15,12 +15,12 @@ func (i SimpleID) ID() string {
 	return string(i)
 }
 
-// SetID is a no-op
-func (i SimpleID) SetID(s string) {
-	// no-op
-}
-
 // Name returns the ID
 func (i SimpleID) Name() string {
 	return i.ID()
 }
+
+// SetName is a no-op
+func (i SimpleID) SetName(s string) {
+	// no-op
+}

chat/message/user.go

@@ -65,8 +65,8 @@ func (u *User) SetConfig(cfg UserConfig) {
 }
 
 // Rename the user with a new Identifier.
-func (u *User) SetID(id string) {
-	u.Identifier.SetID(id)
+func (u *User) SetName(name string) {
+	u.Identifier.SetName(name)
 	u.setColorIdx(rand.Int())
 }
 

identity.go

@@ -30,12 +30,8 @@ func (i Identity) ID() string {
 	return i.id
 }
 
-func (i *Identity) SetID(id string) {
-	i.id = id
-}
-
 func (i *Identity) SetName(name string) {
-	i.SetID(name)
+	i.id = chat.SanitizeName(name)
 }
 
 func (i Identity) Name() string {