helper/model: Add footer notification for message sent outside narrow.

This commit generalizes the code for footer notification when a message
is sent/edited outside the current narrow. This will give the user a pointer
as to why the message disappeared from the screen. The code is hooked to
the part where message request is sent to the server, hence preventing the
extra check for user_id being same as message_sender_id.

Tests amended.

Fixes #781.

tests/helper/test_helper.py

@@ -9,6 +9,7 @@
     hash_util_decode,
     index_messages,
     notify,
+    notify_if_message_sent_outside_narrow,
     powerset,
 )
 
@@ -309,6 +310,41 @@ def test_display_error_if_present(mocker, response, footer_updated):
         set_footer_text.assert_not_called()
 
 
+@pytest.mark.parametrize(['req', 'narrow', 'footer_updated'], [
+    ({'type': 'private', 'to': 'foo@gmail.com', 'content': 'bar'},
+     [['is', 'private']], False),
+    ({'type': 'private', 'to': 'user@abc.com, user@chat.com', 'content': 'Hi'},
+     [['pm_with', 'user@0abc.com']], True),
+    ({'type': 'private', 'to': 'bar-bar@foo.com', 'content': ':party_parrot:'},
+     [['pm_with', 'user@abc.com, user@chat.com, bar-bar@foo.com']], True),
+    ({'type': 'stream', 'to': 'ZT', 'subject': '1', 'content': 'foo'},
+     [['stream', 'ZT'], ['topic', '1']], False),
+    ({'type': 'stream', 'to': 'here', 'subject': 'pytest', 'content': 'py'},
+     [['stream', 'test here']], True),
+    ({'type': 'stream', 'to': '|new_stream|', 'subject': '(no topic)',
+      'content': 'Hi `|new_stream|`'}, [], False),
+    ({'type': 'stream', 'to': 'zulip-terminal', 'subject': 'issue#T781',
+      'content': 'Added tests'}, [['is', 'starred']], True),
+    ({'type': 'private', 'to': '2@aBd%8@random.com', 'content': 'fist_bump'},
+     [['is', 'mentioned']], True),
+    ({'type': 'stream', 'to': 'PTEST', 'subject': 'TEST', 'content': 'Test'},
+     [['stream', 'PTEST'], ['search', 'FOO']], True)
+])
+def test_notify_if_message_sent_outside_narrow(mocker, req, narrow,
+                                               footer_updated):
+    controller = mocker.Mock()
+    set_footer_text = controller.view.set_footer_text
+    controller.model.narrow = narrow
+
+    notify_if_message_sent_outside_narrow(req, controller)
+
+    if footer_updated:
+        set_footer_text.assert_called_once_with(
+            'Message is sent outside of current narrow.', 3)
+    else:
+        set_footer_text.assert_not_called()
+
+
 @pytest.mark.parametrize('quoted_string, expected_unquoted_string', [
     ('(no.20topic)', '(no topic)'),
     ('.3Cstrong.3Exss.3C.2Fstrong.3E', '<strong>xss</strong>'),

tests/model/test_model.py

@@ -23,6 +23,8 @@ def mock_external_classes(self, mocker: Any) -> None:
         mocker.patch('zulipterminal.model.Model._start_presence_updates')
         self.display_error_if_present = mocker.patch(
                             'zulipterminal.model.display_error_if_present')
+        self.notify_if_message_sent_outside_narrow = mocker.patch(
+            'zulipterminal.model.notify_if_message_sent_outside_narrow')
 
     @pytest.fixture
     def model(self, mocker, initial_data, user_profile,
@@ -481,6 +483,9 @@ def test_send_private_message(self, mocker, model,
         assert result == return_value
         self.display_error_if_present.assert_called_once_with(response,
                                                               self.controller)
+        if result == 'success':
+            self.notify_if_message_sent_outside_narrow.assert_called_once_with(
+                req, self.controller)
 
     def test_send_private_message_with_no_recipients(self, model,
                                                      content="hi!",
@@ -507,6 +512,10 @@ def test_send_stream_message(self, mocker, model,
         self.display_error_if_present.assert_called_once_with(response,
                                                               self.controller)
 
+        if result == 'success':
+            self.notify_if_message_sent_outside_narrow.assert_called_once_with(
+                req, self.controller)
+
     @pytest.mark.parametrize('response, return_value', [
         ({'result': 'success'}, True),
         ({'result': 'some_failure'}, False),
@@ -530,23 +539,38 @@ def test_update_private_message(self, mocker, model,
         ({'result': 'success'}, True),
         ({'result': 'some_failure'}, False),
     ])
-    @pytest.mark.parametrize('req', [
+    @pytest.mark.parametrize('req, old_topic, footer_updated', [
+        ({'message_id': 1, 'propagate_mode': 'change_one',
+          'content': 'hi!', 'topic': 'Some topic'}, 'Some topic', False),
         ({'message_id': 1, 'propagate_mode': 'change_one',
-          'content': 'hi!', 'topic': 'Some topic'}),
+          'topic': 'Topic change'}, 'Old topic', True),
+        ({'message_id': 1, 'propagate_mode': 'change_all',
+          'topic': 'Old topic'}, 'Old topic', False),
+        ({'message_id': 1, 'propagate_mode': 'change_later',
+          'content': ':smile:', 'topic': 'terminal'}, 'terminal', False),
         ({'message_id': 1, 'propagate_mode': 'change_one',
-          'topic': 'Topic change'}),
+          'content': 'Hey!', 'topic': 'grett'}, 'greet', True),
+        ({'message_id': 1, 'propagate_mode': 'change_all',
+          'content': 'Lets party!', 'topic': 'party'}, 'lets_party', True),
     ])
     def test_update_stream_message(self, mocker, model,
                                    response, return_value,
-                                   req):
+                                   req, old_topic, footer_updated):
         self.client.update_message = mocker.Mock(return_value=response)
+        model.index['messages'][req['message_id']]['subject'] = old_topic
 
         result = model.update_stream_message(**req)
 
         self.client.update_message.assert_called_once_with(req)
         assert result == return_value
         self.display_error_if_present.assert_called_once_with(response,
                                                               self.controller)
+        set_footer_text = model.controller.view.set_footer_text
+        if result and footer_updated:
+            set_footer_text.assert_called_once_with(
+                "You changed a message's topic.", 3)
+        else:
+            set_footer_text.assert_not_called()
 
     # NOTE: This tests only getting next-unread, not a fixed anchor
     def test_success_get_messages(self, mocker, messages_successful_response,

zulipterminal/helper.py

@@ -25,7 +25,7 @@
 import lxml.html
 from typing_extensions import Literal, TypedDict
 
-from zulipterminal.api_types import Message
+from zulipterminal.api_types import Composition, Message
 
 
 MACOS = platform.system() == "Darwin"
@@ -651,6 +651,31 @@ def display_error_if_present(response: Dict[str, Any], controller: Any
         controller.view.set_footer_text(response['msg'], 3)
 
 
+def check_narrow_and_notify(outer_narrow: List[Any],
+                            inner_narrow: List[Any],
+                            controller: Any) -> None:
+    current_narrow = controller.model.narrow
+
+    if (current_narrow != [] and current_narrow != outer_narrow
+            and current_narrow != inner_narrow):
+        controller.view.set_footer_text(
+            'Message is sent outside of current narrow.', 3)
+
+
+def notify_if_message_sent_outside_narrow(message: Composition,
+                                          controller: Any) -> None:
+    current_narrow = controller.model.narrow
+
+    if message['type'] == 'stream':
+        stream_narrow = [['stream', message['to']]]
+        topic_narrow = stream_narrow + [['topic', message['subject']]]
+        check_narrow_and_notify(stream_narrow, topic_narrow, controller)
+    elif message['type'] == 'private':
+        pm_narrow = [['is', 'private']]
+        pm_with_narrow = [['pm_with', ",".join(message['to'])]]
+        check_narrow_and_notify(pm_narrow, pm_with_narrow, controller)
+
+
 def hash_util_decode(string: str) -> str:
     """
     Returns a decoded string given a hash_util_encode() [present in

zulipterminal/model.py

@@ -43,6 +43,7 @@
     index_messages,
     initial_index,
     notify,
+    notify_if_message_sent_outside_narrow,
     set_count,
 )
 from zulipterminal.ui_tools.utils import create_msg_box_list
@@ -391,7 +392,12 @@ def send_private_message(self, recipients: List[str],
             )
             response = self.client.send_message(composition)
             display_error_if_present(response, self.controller)
-            return response['result'] == 'success'
+            message_was_sent = response['result'] == 'success'
+            if message_was_sent:
+                notify_if_message_sent_outside_narrow(
+                    composition, self.controller,
+                )
+            return message_was_sent
         else:
             raise RuntimeError('Empty recipients list.')
 
@@ -405,7 +411,10 @@ def send_stream_message(self, stream: str, topic: str,
         )
         response = self.client.send_message(composition)
         display_error_if_present(response, self.controller)
-        return response['result'] == 'success'
+        message_was_sent = response['result'] == 'success'
+        if message_was_sent:
+            notify_if_message_sent_outside_narrow(composition, self.controller)
+        return message_was_sent
 
     def update_private_message(self, msg_id: int, content: str) -> bool:
         request = {
@@ -429,6 +438,13 @@ def update_stream_message(self, topic: str, message_id: int,
 
         response = self.client.update_message(request)
         display_error_if_present(response, self.controller)
+        if response['result'] == 'success':
+            old_topic = self.index['messages'][message_id].get('subject', None)
+            new_topic = request['topic']
+            view = self.controller.view
+            if old_topic != new_topic:
+                view.set_footer_text("You changed a message's topic.", 3)
+
         return response['result'] == 'success'
 
     def fetch_custom_emojis(self) -> NamedEmojiData: