Support 'Narrow to current compose box recipient'.

docs/hotkeys.md

@@ -80,6 +80,7 @@
 |Save current message as a draft|<kbd>meta</kbd> + <kbd>s</kbd>|
 |Autocomplete @mentions, #stream_names, :emoji: and topics|<kbd>ctrl</kbd> + <kbd>f</kbd>|
 |Cycle through autocomplete suggestions in reverse|<kbd>ctrl</kbd> + <kbd>r</kbd>|
+|Narrow to compose box message recipient|<kbd>meta</kbd> + <kbd>.</kbd>|
 |Jump to the beginning of line|<kbd>ctrl</kbd> + <kbd>a</kbd>|
 |Jump to the end of line|<kbd>ctrl</kbd> + <kbd>e</kbd>|
 |Jump backward one word|<kbd>meta</kbd> + <kbd>b</kbd>|

tests/helper/test_helper.py

@@ -5,6 +5,7 @@
 from pytest_mock import MockerFixture
 
 from zulipterminal.api_types import Composition
+from zulipterminal.config.keys import primary_key_for_command
 from zulipterminal.helper import (
     Index,
     canonicalize_color,
@@ -428,8 +429,10 @@ def test_notify_if_message_sent_outside_narrow(
     notify_if_message_sent_outside_narrow(req, controller)
 
     if footer_updated:
+        key = primary_key_for_command("NARROW_MESSAGE_RECIPIENT")
         report_success.assert_called_once_with(
-            "Message is sent outside of current narrow."
+            f"Message is sent outside of current narrow. Press [{key}] to narrow to conversation.",
+            duration=6,
         )
     else:
         report_success.assert_not_called()

zulipterminal/config/keys.py

@@ -164,6 +164,11 @@ class KeyBinding(TypedDict, total=False):
         'help_text': 'Narrow to the topic of the current message',
         'key_category': 'msg_actions',
     }),
+    ('NARROW_MESSAGE_RECIPIENT', {
+        'keys': ['meta .'],
+        'help_text': 'Narrow to compose box message recipient',
+        'key_category': 'msg_compose',
+    }),
     ('TOGGLE_NARROW', {
         'keys': ['z'],
         'help_text':

zulipterminal/helper.py

@@ -26,6 +26,7 @@
 from typing_extensions import TypedDict
 
 from zulipterminal.api_types import Composition, EmojiType, Message
+from zulipterminal.config.keys import primary_key_for_command
 from zulipterminal.config.regexes import (
     REGEX_COLOR_3_DIGIT,
     REGEX_COLOR_6_DIGIT,
@@ -652,7 +653,12 @@ def check_narrow_and_notify(
         and current_narrow != outer_narrow
         and current_narrow != inner_narrow
     ):
-        controller.report_success("Message is sent outside of current narrow.")
+        key = primary_key_for_command("NARROW_MESSAGE_RECIPIENT")
+
+        controller.report_success(
+            f"Message is sent outside of current narrow. Press [{key}] to narrow to conversation.",
+            duration=6,
+        )
 
 
 def notify_if_message_sent_outside_narrow(

zulipterminal/ui_tools/boxes.py

@@ -773,6 +773,27 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
                 if self.msg_edit_state is not None:
                     self.keypress(size, primary_key_for_command("GO_BACK"))
                     assert self.msg_edit_state is None
+        elif is_command_key("NARROW_MESSAGE_RECIPIENT", key):
+            if self.compose_box_status == "open_with_stream":
+                self.model.controller.narrow_to_topic(
+                    stream_name=self.stream_write_box.edit_text,
+                    topic_name=self.title_write_box.edit_text,
+                    contextual_message_id=None,
+                )
+            elif self.compose_box_status == "open_with_private":
+                self.recipient_emails = [
+                    self.model.user_id_email_dict[user_id]
+                    for user_id in self.recipient_user_ids
+                ]
+                if self.recipient_user_ids:
+                    self.model.controller.narrow_to_user(
+                        recipient_emails=self.recipient_emails,
+                        contextual_message_id=None,
+                    )
+                else:
+                    self.view.controller.report_error(
+                        "Cannot narrow to message without specifying recipients."
+                    )
         elif is_command_key("GO_BACK", key):
             self.send_stop_typing_status()
             self._set_compose_attributes_to_defaults()