From 2406687ea0153b9c3c054f466e4c7a2013944542 Mon Sep 17 00:00:00 2001
From: Victor Chang <vicchang@nvidia.com>
Date: Mon, 13 Jan 2025 19:06:13 -0800
Subject: [PATCH] Prompt when input directory is empty

Signed-off-by: Victor Chang <vicchang@nvidia.com>
---
 pyproject.toml                            |  2 +-
 src/holoscan_cli/common/argparse_types.py |  4 ++++
 tests/unit/common/test_argparse_types.py  | 14 ++++++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/pyproject.toml b/pyproject.toml
index fbd76b8..160c8f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,11 +56,11 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Typing :: Typed",
 ]
-version = "0.0.0"
 
 # [tool.poetry.build]
 # script = "build.py"
 # generate-setup-file = false
+version = "0.0.0"
 
 [tool.poetry.dependencies]
 python = ">=3.9,<3.13"
diff --git a/src/holoscan_cli/common/argparse_types.py b/src/holoscan_cli/common/argparse_types.py
index f81398f..af4eed3 100644
--- a/src/holoscan_cli/common/argparse_types.py
+++ b/src/holoscan_cli/common/argparse_types.py
@@ -84,6 +84,10 @@ def valid_existing_path(path: str) -> Path:
     path = os.path.expanduser(path)
     file_path = Path(path).absolute()
     if file_path.exists():
+        if os.path.isdir(file_path):
+            if os.listdir(path):
+                return file_path
+            raise argparse.ArgumentTypeError(f"No such file/folder: '{file_path}'")
         return file_path
     raise argparse.ArgumentTypeError(f"No such file/folder: '{file_path}'")
 
diff --git a/tests/unit/common/test_argparse_types.py b/tests/unit/common/test_argparse_types.py
index 21c95d6..53a019c 100644
--- a/tests/unit/common/test_argparse_types.py
+++ b/tests/unit/common/test_argparse_types.py
@@ -93,6 +93,20 @@ def test_existing_path_not_exists(self, monkeypatch):
         with pytest.raises(argparse.ArgumentTypeError):
             valid_existing_path("this/is/some/path")
 
+    def test_empty_directory(self, monkeypatch):
+        monkeypatch.setattr(pathlib.Path, "exists", lambda x: True)
+        monkeypatch.setattr(os.path, "isdir", lambda x: True)
+        monkeypatch.setattr(os, "listdir", lambda x: [])
+        with pytest.raises(argparse.ArgumentTypeError):
+            valid_existing_path("this/is/some/path")
+
+    def test_non_empty_directory(self, monkeypatch):
+        monkeypatch.setattr(pathlib.Path, "exists", lambda x: True)
+        monkeypatch.setattr(os.path, "isdir", lambda x: True)
+        monkeypatch.setattr(os, "listdir", lambda x: ["/a"])
+        result = valid_existing_path("this/is/some/path")
+        assert type(result) is PosixPath
+
 
 class TestValidPlatforms:
     @pytest.mark.parametrize(