refactor: ui: Add semantic styles in set_footer_text().

This commit adds:
 * styling via a semantic parameter to the footer text in
   set_footer_text(). (default styling: "footer:neutral")
 * hooks to use to these semantic styles wherever reasonable.

Tests amended.
Fixes zulip#782.

tests/helper/test_helper.py

@@ -305,7 +305,8 @@ def test_display_error_if_present(mocker, response, footer_updated):
     display_error_if_present(response, controller)
 
     if footer_updated:
-        set_footer_text.assert_called_once_with(response['msg'], 3)
+        set_footer_text.assert_called_once_with(response['msg'],
+                                                'task:failure', 3)
     else:
         set_footer_text.assert_not_called()
 
@@ -340,7 +341,7 @@ def test_notify_if_message_sent_outside_narrow(mocker, req, narrow,
 
     if footer_updated:
         set_footer_text.assert_called_once_with(
-            'Message is sent outside of current narrow.', 3)
+            'Message is sent outside of current narrow.', 'task:success', 3)
     else:
         set_footer_text.assert_not_called()
 

tests/model/test_model.py

@@ -562,7 +562,7 @@ def test_update_stream_message(self, mocker, model,
         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)
+                "You changed a message's topic.", 'task:success', 3)
         else:
             set_footer_text.assert_not_called()
 

tests/ui/test_ui.py

@@ -76,7 +76,7 @@ def test_set_footer_text_with_duration(self, view, mocker,
                      return_value=['some help text'])
         mock_sleep = mocker.patch('time.sleep')
 
-        view.set_footer_text([custom_text], duration)
+        view.set_footer_text([custom_text], duration=duration)
 
         view._w.footer.set_text.assert_has_calls([
             mocker.call([custom_text]),

zulipterminal/helper.py

@@ -648,7 +648,7 @@ def notify(title: str, html_text: str) -> str:
 def display_error_if_present(response: Dict[str, Any], controller: Any
                              ) -> None:
     if response['result'] == 'error' and hasattr(controller, 'view'):
-        controller.view.set_footer_text(response['msg'], 3)
+        controller.view.set_footer_text(response['msg'], 'task:failure', 3)
 
 
 def check_narrow_and_notify(outer_narrow: List[Any],
@@ -659,7 +659,7 @@ def check_narrow_and_notify(outer_narrow: List[Any],
     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)
+            'Message is sent outside of current narrow.', 'task:success', 3)
 
 
 def notify_if_message_sent_outside_narrow(message: Composition,

zulipterminal/model.py

@@ -376,7 +376,8 @@ def session_draft_message(self) -> Optional[Composition]:
 
     def save_draft(self, draft: Composition) -> None:
         self._draft = deepcopy(draft)
-        self.controller.view.set_footer_text("Saved message as draft", 3)
+        self.controller.view.set_footer_text("Saved message as draft",
+                                             'task:success', 3)
 
     @asynch
     def toggle_message_star_status(self, message: Message) -> None:
@@ -474,7 +475,8 @@ def update_stream_message(self, topic: str, message_id: int,
             new_topic = request['topic']
             view = self.controller.view
             if old_topic != new_topic:
-                view.set_footer_text("You changed a message's topic.", 3)
+                view.set_footer_text("You changed a message's topic.",
+                                     'task:success', 3)
 
         return response['result'] == 'success'
 

zulipterminal/ui.py

@@ -78,12 +78,14 @@ def get_random_help(self) -> List[Any]:
 
     @asynch
     def set_footer_text(self, text_list: Optional[List[Any]]=None,
+                        theme: str='footer:neutral',
                         duration: Optional[float]=None) -> None:
         if text_list is None:
             text = self.get_random_help()
         else:
             text = text_list
         self._w.footer.set_text(text)
+        self._w.footer.set_attr_map({None: theme})
         self.controller.update_screen()
         if duration is not None:
             assert duration > 0
@@ -250,7 +252,7 @@ def keypress(self, size: Tuple[int, int], key: str) -> Optional[str]:
                 self.middle_column.set_focus('footer')
             else:
                 self.set_footer_text('No draft message was saved in'
-                                     ' this session.', 3)
+                                     ' this session.', 'task:failure', 3)
             return key
         elif is_command_key('ABOUT', key):
             self.controller.show_about()

zulipterminal/ui_tools/boxes.py

@@ -535,7 +535,8 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
                         )
                     else:
                         self.view.set_footer_text("Cannot send message without"
-                                                  " specifying recipients.", 3)
+                                                  " specifying recipients.",
+                                                  'task:failure', 3)
                         success = None
             if success:
                 self.msg_write_box.edit_text = ''
@@ -594,7 +595,8 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
                                             '_REVERSE'
                                         ))
                             )
-                            self.view.set_footer_text(invalid_stream_error, 3)
+                            self.view.set_footer_text(invalid_stream_error,
+                                                      'task:failure', 3)
                             return key
                         user_ids = self.model.get_other_subscribers_in_stream(
                                                     stream_name=stream_name)
@@ -625,7 +627,8 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
                     if invalid_emails:
                         invalid_emails_error = ('Invalid recipient(s) - '
                                                 + ', '.join(invalid_emails))
-                        self.view.set_footer_text(invalid_emails_error, 3)
+                        self.view.set_footer_text(invalid_emails_error,
+                                                  'task:failure', 3)
                         return key
                     users = self.model.user_dict
                     self.recipient_user_ids = [users[email]['user_id']
@@ -1509,12 +1512,13 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
         elif is_command_key('EDIT_MESSAGE', key):
             if self.message['sender_id'] != self.model.user_id:
                 self.model.controller.view.set_footer_text(
-                        " You can't edit messages sent by other users.", 3)
+                        " You can't edit messages sent by other users.",
+                        'task:failure', 3)
                 return key
             # Check if editing is allowed in the realm
             elif not self.model.initial_data['realm_allow_message_editing']:
                 self.model.controller.view.set_footer_text(
-                    " Editing sent message is disabled.", 3)
+                    " Editing sent message is disabled.", 'task:failure', 3)
                 return key
             # Check if message is still editable, i.e. within
             # the time limit.
@@ -1526,13 +1530,13 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
                 if self.message['type'] == 'private':
                     self.model.controller.view.set_footer_text(
                             " Time Limit for editing the message has"
-                            " been exceeded.", 3)
+                            " been exceeded.", 'task:failure', 3)
                     return key
                 elif self.message['type'] == 'stream':
                     self.model.controller.view.set_footer_text(
                             " Only topic editing allowed."
                             " Time Limit for editing the message body has"
-                            " been exceeded.", 3)
+                            " been exceeded.", 'task:warning', 3)
                     msg_body_edit_enabled = False
 
             if self.message['type'] == 'private':

zulipterminal/ui_tools/buttons.py

@@ -513,7 +513,7 @@ def handle_narrow_link(self) -> None:
         error = self._validate_narrow_link(parsed_link)
 
         if error:
-            self.view.set_footer_text(f" {error}", duration=3)
+            self.view.set_footer_text(f" {error}", 'task:failure', duration=3)
         else:
             self._switch_narrow_to(parsed_link)