/reply command with autocomplete.

chat/command.go

@@ -201,7 +201,7 @@ func InitCommands(c *Commands) {
 
 	c.Add(Command{
 		Prefix: "/quiet",
-		Help:   "Silence announcement-type messages (join, part, rename, etc).",
+		Help:   "Silence room announcements.",
 		Handler: func(room *Room, msg CommandMsg) error {
 			u := msg.From()
 			u.ToggleQuietMode()

chat/user.go

@@ -64,6 +64,16 @@ func (u *User) SetId(id Id) {
 	u.SetColorIdx(rand.Int())
 }
 
+// ReplyTo returns the last user that messaged this user.
+func (u *User) ReplyTo() *User {
+	return u.replyTo
+}
+
+// SetReplyTo sets the last user to message this user.
+func (u *User) SetReplyTo(user *User) {
+	u.replyTo = user
+}
+
 // ToggleQuietMode will toggle whether or not quiet mode is enabled
 func (u *User) ToggleQuietMode() {
 	u.Config.Quiet = !u.Config.Quiet
@@ -113,10 +123,13 @@ func (u *User) SetHighlight(s string) error {
 	return nil
 }
 
-func (u User) render(m Message) string {
+func (u *User) render(m Message) string {
 	switch m := m.(type) {
 	case *PublicMsg:
 		return m.RenderFor(u.Config) + Newline
+	case *PrivateMsg:
+		u.SetReplyTo(m.From())
+		return m.Render(u.Config.Theme) + Newline
 	default:
 		return m.Render(u.Config.Theme) + Newline
 	}

host.go

@@ -68,8 +68,6 @@ func (h Host) isOp(conn sshd.Connection) bool {
 // Connect a specific Terminal to this host and its room.
 func (h *Host) Connect(term *sshd.Terminal) {
 	id := NewIdentity(term.Conn)
-	term.AutoCompleteCallback = h.AutoCompleteFunction
-
 	user := chat.NewUserScreen(id, term)
 	user.Config.Theme = h.theme
 	go func() {
@@ -92,6 +90,7 @@ func (h *Host) Connect(term *sshd.Terminal) {
 
 	// Successfully joined.
 	term.SetPrompt(GetPrompt(user))
+	term.AutoCompleteCallback = h.AutoCompleteFunction(user)
 	user.SetHighlight(user.Name())
 	h.count++
 
@@ -159,8 +158,9 @@ func (h Host) completeCommand(partial string) string {
 	return ""
 }
 
-// AutoCompleteFunction is a callback for terminal autocompletion
+// AutoCompleteFunction returns a callback for terminal autocompletion
-func (h *Host) AutoCompleteFunction(line string, pos int, key rune) (newLine string, newPos int, ok bool) {
+func (h *Host) AutoCompleteFunction(u *chat.User) func(line string, pos int, key rune) (newLine string, newPos int, ok bool) {
+	return func(line string, pos int, key rune) (newLine string, newPos int, ok bool) {
 		if key != 9 {
 			return
 		}
@@ -179,6 +179,12 @@ func (h *Host) AutoCompleteFunction(line string, pos int, key rune) (newLine str
 		if isFirst && strings.HasPrefix(partial, "/") {
 			// Command
 			completed = h.completeCommand(partial)
+			if completed == "/reply" {
+				replyTo := u.ReplyTo()
+				if replyTo != nil {
+					completed = "/msg " + replyTo.Name()
+				}
+			}
 		} else {
 			// Name
 			completed = h.completeName(partial)
@@ -198,6 +204,7 @@ func (h *Host) AutoCompleteFunction(line string, pos int, key rune) (newLine str
 		ok = true
 		return
 	}
+}
 
 // GetUser returns a chat.User based on a name.
 func (h *Host) GetUser(name string) (*chat.User, bool) {
@@ -235,6 +242,28 @@ func (h *Host) InitCommands(c *chat.Commands) {
 		},
 	})
 
+	c.Add(chat.Command{
+		Prefix:     "/reply",
+		PrefixHelp: "MESSAGE",
+		Help:       "Reply with MESSAGE to the previous private message.",
+		Handler: func(room *chat.Room, msg chat.CommandMsg) error {
+			args := msg.Args()
+			switch len(args) {
+			case 0:
+				return errors.New("must specify message")
+			}
+
+			target := msg.From().ReplyTo()
+			if target == nil {
+				return errors.New("no message to reply to")
+			}
+
+			m := chat.NewPrivateMsg(strings.Join(args, " "), msg.From(), target)
+			room.Send(m)
+			return nil
+		},
+	})
+
 	// Op commands
 	c.Add(chat.Command{
 		Op:         true,