Add command /clear.

client.go

@@ -1061,6 +1061,13 @@ func handleClientMessage(c *client, m clientMessage) error {
 		for _, cc := range clients {
 			cc.write(m)
 		}
+	case "clearchat":
+		c.group.clearChatHistory()
+		m := clientMessage{Type: "clearchat"}
+		clients := c.group.getClients(nil)
+		for _, cc := range clients {
+			cc.write(m)
+		}
 	case "op", "unop", "present", "unpresent":
 		if !c.permissions.Op {
 			c.error(userError("not authorised"))

group.go

@@ -361,6 +361,12 @@ func (g *group) Range(f func(c *client) bool) {
 
 const maxChatHistory = 20
 
+func (g *group) clearChatHistory() {
+	g.mu.Lock()
+	defer g.mu.Unlock()
+	g.history = nil
+}
+
 func (g *group) addToChatHistory(id, user, value string, me bool) {
 	g.mu.Lock()
 	defer g.mu.Unlock()

static/sfu.js

@@ -435,6 +435,9 @@ function serverConnect() {
             case 'chat':
                 addToChatbox(m.id, m.username, m.value, m.me);
                 break;
+            case 'clearchat':
+                resetChat();
+                break;
             case 'ping':
                 send({
                     type: 'pong',
@@ -750,6 +753,15 @@ function handleInput() {
             case '/leave':
                 socket.close();
                 return;
+            case '/clear':
+                if(!permissions.op) {
+                    displayError("You're not an operator");
+                    return;
+                }
+                send({
+                    type: 'clearchat',
+                });
+                return;
             case '/op':
             case '/unop':
             case '/kick':