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backend/venv/Lib/site-packages/hypothesis/utils/terminal.py

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+# This file is part of Hypothesis, which may be found at
+# https://github.com/HypothesisWorks/hypothesis/
+#
+# Copyright the Hypothesis Authors.
+# Individual contributors are listed in AUTHORS.rst and the git log.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/.
+
+import os
+
+
+def guess_background_color():
+    """Returns one of "dark", "light", or "unknown".
+
+    This is basically just guessing, but better than always guessing "dark"!
+    See also https://stackoverflow.com/questions/2507337/ and
+    https://unix.stackexchange.com/questions/245378/
+    """
+    django_colors = os.getenv("DJANGO_COLORS", "")
+    for theme in ("light", "dark"):
+        if theme in django_colors.split(";"):
+            return theme
+    # Guessing based on the $COLORFGBG environment variable
+    try:
+        fg, *_, bg = os.getenv("COLORFGBG").split(";")
+    except Exception:
+        pass
+    else:
+        # 0=black, 7=light-grey, 15=white ; we don't interpret other colors
+        if fg in ("7", "15") and bg == "0":
+            return "dark"
+        elif fg == "0" and bg in ("7", "15"):
+            return "light"
+    # TODO: Guessing based on the xterm control sequence
+    return "unknown"