core/helper: Suppress stderr and stdout for view_in_browser.

zulipterminal/core.py

@@ -11,7 +11,9 @@
 import zulip
 
 from zulipterminal.config.themes import ThemeSpec
-from zulipterminal.helper import MACOS, WSL, Message, asynch, near_message_url
+from zulipterminal.helper import (
+    MACOS, WSL, Message, asynch, near_message_url, suppress_output,
+)
 from zulipterminal.model import Model
 from zulipterminal.ui import Screen, View
 from zulipterminal.ui_tools.utils import create_msg_box_list
@@ -281,7 +283,9 @@ def view_in_browser(self, message: Message) -> None:
         self.message_url = near_message_url(self.model.server_url[:-1],
                                             message)
 
-        webbrowser.open(self.message_url)
+        with suppress_output():
+            # Suppress anything on stdout & stderr when opening the browser.
+            webbrowser.open(self.message_url)
 
     def _finalize_show(self, w_list: List[Any]) -> None:
         focus_position = self.model.get_focus_in_current_narrow()

zulipterminal/helper.py

@@ -5,13 +5,14 @@
 import time
 import urllib
 from collections import OrderedDict, defaultdict
+from contextlib import contextmanager
 from functools import wraps
 from itertools import chain, combinations
 from re import ASCII, match
 from threading import Thread
 from typing import (
-    Any, Callable, DefaultDict, Dict, FrozenSet, Iterable, List, Set, Tuple,
-    TypeVar, Union,
+    Any, Callable, DefaultDict, Dict, FrozenSet, Iterable, Iterator, List, Set,
+    Tuple, TypeVar, Union,
 )
 
 import lxml.html
@@ -650,3 +651,22 @@ def near_message_url(server_url: str, message: Message) -> str:
     else:
         url = near_pm_message_url(server_url, message)
     return url
+
+
+@contextmanager
+def suppress_output() -> Iterator[None]:
+    """
+    Context manager to redirect stdout and stderr to /dev/null.
+
+    Adapted from https://stackoverflow.com/a/2323563.
+    """
+    out = os.dup(1)
+    err = os.dup(2)
+    os.close(1)
+    os.close(2)
+    os.open(os.devnull, os.O_RDWR)
+    try:
+        yield
+    finally:
+        os.dup2(out, 1)
+        os.dup2(err, 2)