Doc light-theme vars

Zac-HD · Zac-HD · commit 3ffecc1f396d · 2021-11-29T17:17:40.000+11:00
diff --git a/hypothesis-python/src/hypothesis/extra/ghostwriter.py b/hypothesis-python/src/hypothesis/extra/ghostwriter.py
@@ -53,6 +53,11 @@
       -e, --except OBJ_NAME      dotted name of exception(s) to ignore
       -h, --help                 Show this message and exit.
 
+.. tip::
+
+    Using a light theme?  Hypothesis respects `NO_COLOR <https://no-color.org/>`__
+    and :envvar:`DJANGO_COLORS=light <django:DJANGO_COLORS>`.
+
 .. note::
 
     The ghostwriter requires :pypi:`black`, but the generated code only
diff --git a/hypothesis-python/src/hypothesis/utils/terminal.py b/hypothesis-python/src/hypothesis/utils/terminal.py
@@ -23,6 +23,9 @@ def guess_background_color():
     See also https://stackoverflow.com/questions/2507337/ and
     https://unix.stackexchange.com/questions/245378/
     """
+    django_colors = os.getenv("DJANGO_COLORS")
+    if django_colors in ("light", "dark"):
+        return django_colors
     # Guessing based on the $COLORFGBG environment variable
     try:
         fg, *_, bg = os.getenv("COLORFGBG").split(";")
