1 files changed, 21 insertions, 0 deletions
diff --git a/test/lib/ansible_test/_util/controller/sanity/code-smell/no-main-display.py b/test/lib/ansible_test/_util/controller/sanity/code-smell/no-main-display.py
new file mode 100644
index 0000000..eb5987d
--- /dev/null
+++ b/test/lib/ansible_test/_util/controller/sanity/code-smell/no-main-display.py
@@ -0,0 +1,21 @@
+"""Disallow importing display from __main__."""
+from __future__ import annotations
+
+import sys
+
+MAIN_DISPLAY_IMPORT = 'from __main__ import display'
+
+
+def main():
+    """Main entry point."""
+    for path in sys.argv[1:] or sys.stdin.read().splitlines():
+        with open(path, 'r', encoding='utf-8') as file:
+            for i, line in enumerate(file.readlines()):
+                if MAIN_DISPLAY_IMPORT in line:
+                    lineno = i + 1
+                    colno = line.index(MAIN_DISPLAY_IMPORT) + 1
+                    print('%s:%d:%d: Display is a singleton, just import and instantiate' % (path, lineno, colno))
+
+
+if __name__ == '__main__':
+    main()