Group sequential messages from same sender

Name and date are not repeated anymore.

web-chat/src/ChatList.tsx

@@ -1,6 +1,11 @@
 import { useEffect, useRef } from 'react';
 import { ChatMessage } from '../../build/main/chat/chat_message';
-import { Message, MessageText, MessageGroup } from '@livechat/ui-kit';
+import {
+  Message,
+  MessageText,
+  MessageGroup,
+  MessageList,
+} from '@livechat/ui-kit';
 
 interface Props {
   messages: ChatMessage[];
@@ -9,7 +14,10 @@ interface Props {
 export default function ChatList(props: Props) {
   const messages = props.messages;
 
-  const listItems = messages.map((currentMessage) => (
+  const messagesGroupedBySender = groupMessagesBySender(props.messages).map(
+    (currentMessageGroup) => (
+      <MessageGroup onlyFirstWithMeta>
+        {currentMessageGroup.map((currentMessage) => (
           <Message
             // We assume that the same user is not sending two messages in the same second
             key={currentMessage.timestamp.toString() + currentMessage.nick}
@@ -18,16 +26,38 @@ export default function ChatList(props: Props) {
           >
             <MessageText>{currentMessage.message}</MessageText>
           </Message>
-  ));
+        ))}
-
-  return (
-    <MessageGroup>
-      {listItems}
-      <AlwaysScrollToBottom messages={messages} />
       </MessageGroup>
+    )
   );
 
-  function formatDisplayDate(message: ChatMessage) {
+  return (
+    <MessageList active containScrollInSubtree>
+      {messagesGroupedBySender}
+      <AlwaysScrollToBottom messages={messages} />
+    </MessageList>
+  );
+}
+
+function groupMessagesBySender(messageArray: ChatMessage[]): ChatMessage[][] {
+  let currentSender = -1;
+  let lastNick = '';
+  let messagesBySender: ChatMessage[][] = [];
+  let currentSenderMessage = 0;
+
+  for (let currentMessage of messageArray) {
+    if (lastNick !== currentMessage.nick) {
+      currentSender++;
+      messagesBySender[currentSender] = [];
+      currentSenderMessage = 0;
+      lastNick = currentMessage.nick;
+    }
+    messagesBySender[currentSender][currentSenderMessage++] = currentMessage;
+  }
+  return messagesBySender;
+}
+
+function formatDisplayDate(message: ChatMessage): string {
   return message.timestamp.toLocaleString([], {
     month: 'short',
     day: 'numeric',
@@ -36,7 +66,6 @@ export default function ChatList(props: Props) {
     hour12: false,
   });
 }
-}
 
 const AlwaysScrollToBottom = (props: Props) => {
   const elementRef = useRef<HTMLDivElement>();

web-chat/src/Room.tsx

@@ -5,7 +5,7 @@ import { ChatContentTopic } from './App';
 import ChatList from './ChatList';
 import MessageInput from './MessageInput';
 import { useWaku } from './WakuContext';
-import { TitleBar, MessageList } from '@livechat/ui-kit';
+import { TitleBar } from '@livechat/ui-kit';
 
 interface Props {
   lines: ChatMessage[];
@@ -23,9 +23,7 @@ export default function Room(props: Props) {
       style={{ height: '98vh', display: 'flex', flexDirection: 'column' }}
     >
       <TitleBar title="Waku v2 chat app" />
-      <MessageList active containScrollInSubtree>
       <ChatList messages={props.lines} />
-      </MessageList>
       <MessageInput
         messageHandler={setMessageToSend}
         sendMessage={