message: Add function to remove single newline in triple quoted string.

For multiline strings in triple quotes, a '\n' is included
at the end of each line.

Earlier, to skip '\n' we used to add an escape character '\'
at the end of each line.

This commit adds a function to avoid manually adding '\'.

zerver/lib/message.py

@@ -1,3 +1,4 @@
+import re
 from dataclasses import dataclass, field
 from datetime import datetime, timedelta
 from typing import (
@@ -1439,3 +1440,8 @@ def set_visibility_policy_possible(user_profile: UserProfile, message: Message)
         return False
 
     return True
+
+
+def remove_single_newlines(content: str) -> str:
+    content = content.strip("\n")
+    return re.sub(r"(?<!\n)\n(?!\n)", " ", content)

zerver/lib/onboarding.py

@@ -14,7 +14,7 @@ from zerver.actions.message_send import (
 )
 from zerver.actions.reactions import do_add_reaction
 from zerver.lib.emoji import get_emoji_data
-from zerver.lib.message import SendMessageRequest
+from zerver.lib.message import SendMessageRequest, remove_single_newlines
 from zerver.models import Message, Realm, UserProfile
 from zerver.models.users import get_system_bot
 
@@ -314,20 +314,22 @@ def send_initial_realm_messages(realm: Realm) -> None:
             start_topic_help_url="/help/starting-a-new-topic",
         )
 
-        content_of_zulip_update_announcements_topic_name = (
+        content_of_zulip_update_announcements_topic_name = remove_single_newlines(
+            (
                 _("""
-Welcome! To help you learn about new features and configuration options, \
+Welcome! To help you learn about new features and configuration options,
 this topic will receive messages about important changes in Zulip.
 
-You can read these update messages whenever it's convenient, or \
-[mute]({mute_topic_help_url}) this topic if you are not interested. \
-If your organization does not want to receive these announcements, \
+You can read these update messages whenever it's convenient, or
+[mute]({mute_topic_help_url}) this topic if you are not interested.
+If your organization does not want to receive these announcements,
 they can be disabled. [Learn more]({zulip_update_announcements_help_url}).
             """)
             ).format(
                 zulip_update_announcements_help_url="/help/configure-automated-notices#zulip-update-announcements",
                 mute_topic_help_url="/help/mute-a-topic",
             )
+        )
 
     welcome_messages: List[Dict[str, str]] = [
         {

zerver/lib/zulip_update_announcements.py

@@ -13,7 +13,7 @@ from zerver.actions.message_send import (
     internal_prep_huddle_message,
     internal_prep_stream_message,
 )
-from zerver.lib.message import SendMessageRequest
+from zerver.lib.message import SendMessageRequest, remove_single_newlines
 from zerver.models.realm_audit_logs import RealmAuditLog
 from zerver.models.realms import Realm
 from zerver.models.users import UserProfile, get_system_bot
@@ -30,12 +30,12 @@ class ZulipUpdateAnnouncement:
 zulip_update_announcements: List[ZulipUpdateAnnouncement] = [
     ZulipUpdateAnnouncement(
         level=1,
-        message="""\
-Zulip is introducing **Zulip updates**! To help you learn about new features and \
+        message="""
+Zulip is introducing **Zulip updates**! To help you learn about new features and
 configuration options, this topic will receive messages about important changes in Zulip.
 
-You can read these update messages whenever it's convenient, or [mute]({mute_topic_help_url}) \
-this topic if you are not interested. If your organization does not want to receive these \
+You can read these update messages whenever it's convenient, or [mute]({mute_topic_help_url})
+this topic if you are not interested. If your organization does not want to receive these
 announcements, they can be disabled. [Learn more]({zulip_update_announcements_help_url}).
 """.format(
             zulip_update_announcements_help_url="/help/configure-automated-notices#zulip-update-announcements",
@@ -52,7 +52,7 @@ def get_latest_zulip_update_announcements_level() -> int:
 
 def get_zulip_update_announcements_message_for_level(level: int) -> str:
     zulip_update_announcement = zulip_update_announcements[level - 1]
-    return zulip_update_announcement.message
+    return remove_single_newlines(zulip_update_announcement.message)
 
 
 def get_realms_behind_zulip_update_announcements_level(level: int) -> QuerySet[Realm]:
@@ -73,22 +73,22 @@ def internal_prep_group_direct_message_for_old_realm(
     with override_language(realm.default_language):
         topic_name = str(realm.ZULIP_UPDATE_ANNOUNCEMENTS_TOPIC_NAME)
     if realm.zulip_update_announcements_stream is None:
-        content = """\
-Zulip now supports [configuring]({organization_settings_url}) a stream where Zulip will \
-send [updates]({zulip_update_announcements_help_url}) about new Zulip features. \
-These notifications are currently turned off in your organization. If you configure \
+        content = """
+Zulip now supports [configuring]({organization_settings_url}) a stream where Zulip will
+send [updates]({zulip_update_announcements_help_url}) about new Zulip features.
+These notifications are currently turned off in your organization. If you configure
 a stream within one week, your organization will not miss any update messages.
 """.format(
             zulip_update_announcements_help_url="/help/configure-automated-notices#zulip-update-announcements",
             organization_settings_url="/#organization/organization-settings",
         )
     else:
-        content = """\
-Starting tomorrow, users in your organization will receive [updates]({zulip_update_announcements_help_url}) \
+        content = """
+Starting tomorrow, users in your organization will receive [updates]({zulip_update_announcements_help_url})
 about new Zulip features in #**{zulip_update_announcements_stream}>{topic_name}**.
 
-If you like, you can [configure]({organization_settings_url}) a different stream for \
-these updates (and [move]({move_content_another_stream_help_url}) any updates sent before the \
+If you like, you can [configure]({organization_settings_url}) a different stream for
+these updates (and [move]({move_content_another_stream_help_url}) any updates sent before the
 configuration change), or [turn this feature off]({organization_settings_url}) altogether.
 """.format(
             zulip_update_announcements_help_url="/help/configure-automated-notices#zulip-update-announcements",
@@ -97,7 +97,9 @@ configuration change), or [turn this feature off]({organization_settings_url}) a
             organization_settings_url="/#organization/organization-settings",
             move_content_another_stream_help_url="/help/move-content-to-another-stream",
         )
-    return internal_prep_huddle_message(realm, sender, content, recipient_users=administrators)
+    return internal_prep_huddle_message(
+        realm, sender, remove_single_newlines(content), recipient_users=administrators
+    )
 
 
 def is_group_direct_message_sent_to_admins_atleast_one_week_ago(realm: Realm) -> bool:

zerver/tests/test_zulip_update_announcements.py

@@ -5,6 +5,7 @@ import time_machine
 from django.conf import settings
 from django.utils.timezone import now as timezone_now
 
+from zerver.lib.message import remove_single_newlines
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.zulip_update_announcements import (
     ZulipUpdateAnnouncement,
@@ -152,3 +153,30 @@ class ZulipUpdateAnnouncementsTest(ZulipTestCase):
             f"#**{realm.zulip_update_announcements_stream}>{realm.ZULIP_UPDATE_ANNOUNCEMENTS_TOPIC_NAME}**",
             group_direct_message.content,
         )
+
+    def test_remove_single_newlines(self) -> None:
+        # single newlines and double newlines
+        input_text = "This is a sentence.\nThis is another sentence.\n\nThis is a third sentence."
+        expected_output = (
+            "This is a sentence. This is another sentence.\n\nThis is a third sentence."
+        )
+        self.assertEqual(remove_single_newlines(input_text), expected_output)
+
+        # single newline at the beginning
+        input_text = "\nThis is a sentence.\nThis is another sentence.\n\nThis is a third sentence."
+        expected_output = (
+            "This is a sentence. This is another sentence.\n\nThis is a third sentence."
+        )
+        self.assertEqual(remove_single_newlines(input_text), expected_output)
+
+        # single newline at the end
+        input_text = "This is a sentence.\nThis is another sentence.\n\nThis is a third sentence.\n"
+        expected_output = (
+            "This is a sentence. This is another sentence.\n\nThis is a third sentence."
+        )
+        self.assertEqual(remove_single_newlines(input_text), expected_output)
+
+        # only single newlines in the middle
+        input_text = "This is a sentence.\nThis is another sentence.\nThis is a third sentence.\nThis is a fourth sentence."
+        expected_output = "This is a sentence. This is another sentence. This is a third sentence. This is a fourth sentence."
+        self.assertEqual(remove_single_newlines(input_text), expected_output)