Moves conversation.getProps out of models

Co-authored-by: Scott Nonnenberg <scott@signal.org>

ts/util/getLastMessage.ts

@@ -0,0 +1,36 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { ConversationAttributesType } from '../model-types.d';
+import type { LastMessageType } from '../state/ducks/conversations';
+import { dropNull } from './dropNull';
+import { findAndFormatContact } from './findAndFormatContact';
+import { hydrateRanges } from '../types/BodyRange';
+import { stripNewlinesForLeftPane } from './stripNewlinesForLeftPane';
+
+export function getLastMessage(
+  conversationAttrs: ConversationAttributesType
+): LastMessageType | undefined {
+  if (conversationAttrs.lastMessageDeletedForEveryone) {
+    return { deletedForEveryone: true };
+  }
+  const lastMessageText = conversationAttrs.lastMessage;
+  if (!lastMessageText) {
+    return undefined;
+  }
+
+  const rawBodyRanges = conversationAttrs.lastMessageBodyRanges || [];
+  const bodyRanges = hydrateRanges(rawBodyRanges, findAndFormatContact);
+
+  const text = stripNewlinesForLeftPane(lastMessageText);
+  const prefix = conversationAttrs.lastMessagePrefix;
+
+  return {
+    author: dropNull(conversationAttrs.lastMessageAuthor),
+    bodyRanges,
+    deletedForEveryone: false,
+    prefix,
+    status: dropNull(conversationAttrs.lastMessageStatus),
+    text,
+  };
+}