From 810644614022d8835b7d78d1afe074387605e1a3 Mon Sep 17 00:00:00 2001
From: Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>
Date: Wed, 16 Mar 2022 19:27:15 -0500
Subject: postpone referencing sys.modules["__main"] in
 click.utils._detect_program_name

---
 src/click/utils.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/click/utils.py b/src/click/utils.py
index 467b7b6..8283788 100644
--- a/src/click/utils.py
+++ b/src/click/utils.py
@@ -475,7 +475,7 @@ class PacifyFlushWrapper:
 
 
 def _detect_program_name(
-    path: t.Optional[str] = None, _main: ModuleType = sys.modules["__main__"]
+    path: t.Optional[str] = None, _main: t.Optional[ModuleType] = None
 ) -> str:
     """Determine the command used to run the program, for use in help
     text. If a file or entry point was executed, the file name is
@@ -497,6 +497,9 @@ def _detect_program_name(
 
     :meta private:
     """
+    if _main is None:
+        _main = sys.modules["__main__"]
+
     if not path:
         path = sys.argv[0]
 
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