diff --git a/conservancy_beancount/cliutil.py b/conservancy_beancount/cliutil.py
index 58340e72de2ebc23f38cf892ae5b085f543af305..9f960cb987082f217f8de5832f58a5fabb5d6748 100644
--- a/conservancy_beancount/cliutil.py
+++ b/conservancy_beancount/cliutil.py
@@ -18,6 +18,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>."""
 
 import argparse
 import enum
+import inspect
 import logging
 import operator
 import os
@@ -133,6 +134,11 @@ def add_version_argument(parser: argparse.ArgumentParser) -> argparse.Action:
         help="Show program version and license information",
     )
 
+def is_main_script() -> bool:
+    """Return true if the caller is the "main" program."""
+    stack = inspect.stack(context=False)
+    return len(stack) <= 3 and stack[-1].function.startswith('<')
+
 def setup_logger(logger: Union[str, logging.Logger]='',
                  loglevel: int=logging.INFO,
                  stream: TextIO=sys.stderr,