Prompt when input directory is empty

Signed-off-by: Victor Chang <[email protected]>

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"

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}'")
 

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(