messages: Process todo widgets.

Implement logic to display processed todo widgets in ZT.

zulipterminal/ui_tools/messages.py

@@ -33,7 +33,7 @@
 from zulipterminal.server_url import near_message_url
 from zulipterminal.ui_tools.tables import render_table
 from zulipterminal.urwid_types import urwid_MarkupTuple, urwid_Size
-from zulipterminal.widget import find_widget_type
+from zulipterminal.widget import find_widget_type, process_todo_widget
 
 
 if typing.TYPE_CHECKING:
@@ -733,6 +733,24 @@ def main_view(self) -> List[Any]:
         if self.message.get("submessages"):
             widget_type = find_widget_type(self.message.get("submessages"))
 
+            if widget_type == "todo":
+                title, tasks = process_todo_widget(self.message.get("submessages"))
+
+                todo_widget = f"<strong>{title}</strong>"
+
+                if tasks:
+                    for task_id, task_info in tasks.items():
+                        status = "[✔ ]" if task_info["completed"] else "[  ]"
+                        task_name = task_info["task"]
+                        task_description = task_info["desc"]
+
+                        if task_description == "":
+                            todo_widget += f"\n{status} <strong>{task_name}</strong>"
+                        else:
+                            todo_widget += f"\n{status} <strong>{task_name}</strong>: {task_description}"
+
+                self.message["content"] = todo_widget
+
         # Transform raw message content into markup (As needed by urwid.Text)
         content, self.message_links, self.time_mentions = self.transform_content(
             self.message["content"], self.model.server_url