Convert funcitonlogger to native null logger

src/xtgeo/common/__init__.py

@@ -5,20 +5,22 @@
 from xtgeo.common._xyz_enum import _AttrName, _AttrType, _XYZType
 from xtgeo.common.exceptions import WellNotFoundError
 from xtgeo.common.sys import _XTGeoFile, inherit_docstring
+from xtgeo.common.log import null_logger
 
 # flake8: noqa
 from xtgeo.common.xtgeo_dialog import XTGDescription, XTGeoDialog, XTGShowProgress
 from xtgeo.xyz._xyz_data import _XYZData
 
 __all__ = [
-    "_XYZData",
-    "_AttrName",
-    "_AttrType",
-    "_XYZType",
-    "WellNotFoundError",
-    "_XTGeoFile",
     "inherit_docstring",
+    "null_logger",
+    "WellNotFoundError",
     "XTGDescription",
     "XTGeoDialog",
     "XTGShowProgress",
+    "_AttrName",
+    "_AttrType",
+    "_XTGeoFile",
+    "_XYZData",
+    "_XYZType",
 ]

src/xtgeo/common/calc.py

@@ -7,12 +7,10 @@
 import numpy as np
 
 from xtgeo import XTGeoCLibError
-from xtgeo.common import XTGeoDialog
+from xtgeo.common import null_logger
 from xtgeo.cxtgeo import _cxtgeo
 
-xtg = XTGeoDialog()
-
-logger = xtg.functionlogger(__name__)
+logger = null_logger(__name__)
 
 
 def ib_to_ijk(

src/xtgeo/common/log.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+import logging
+
+def null_logger(name: str) -> logging.Logger:
+    """
+    Create and return a logger with a NullHandler.
+
+    This function creates a logger for the specified name and attaches a NullHandler to it. 
+    The NullHandler prevents logging messages from being automatically output to the console 
+    or other default handlers. This is particularly useful in library modules where you want 
+    to provide the users of the library the flexibility to configure their own logging behavior.
+
+    Args:
+        name (str): The name of the logger to be created. This is typically the name of the module 
+                    in which the logger is created (e.g., using __name__).
+
+    Returns:
+        logging.Logger: A logger object configured with a NullHandler.
+
+    Example:
+        # In a library module
+        logger = null_logger(__name__)
+        logger.info("This info won't be logged to the console by default.")
+    """
+
+    logger = logging.getLogger(name)
+    logger.addHandler(logging.NullHandler())
+    return logger