[output] define and use global TTY_STD... values

gallery_dl/extractor/common.py

@@ -11,7 +11,6 @@
 import os
 import re
 import ssl
-import sys
 import time
 import netrc
 import queue
@@ -23,7 +22,7 @@ import requests
 import threading
 from requests.adapters import HTTPAdapter
 from .message import Message
-from .. import config, text, util, cache, exception
+from .. import config, output, text, util, cache, exception
 urllib3 = requests.packages.urllib3
 
 
@@ -289,13 +288,8 @@ class Extractor():
 
     def _check_input_allowed(self, prompt=""):
         input = self.config("input")
-
         if input is None:
-            try:
+            input = output.TTY_STDIN
-                input = sys.stdin.isatty()
-            except Exception:
-                input = False
-
         if not input:
             raise exception.StopExtraction(
                 "User input required (%s)", prompt.strip(" :"))

gallery_dl/output.py

@@ -17,6 +17,22 @@ from . import config, util, formatter
 # --------------------------------------------------------------------
 # Globals
 
+try:
+    TTY_STDOUT = sys.stdout.isatty()
+except Exception:
+    TTY_STDOUT = False
+
+try:
+    TTY_STDERR = sys.stderr.isatty()
+except Exception:
+    TTY_STDERR = False
+
+try:
+    TTY_STDIN = sys.stdin.isatty()
+except Exception:
+    TTY_STDIN = False
+
+
 COLORS = not os.environ.get("NO_COLOR")
 COLORS_DEFAULT = {
     "success": "1;32",
@@ -323,7 +339,7 @@ def select():
 
     if mode is None or mode == "auto":
         try:
-            if sys.stdout.isatty():
+            if TTY_STDOUT:
                 output = ColorOutput() if ANSI else TerminalOutput()
             else:
                 output = PipeOutput()