Fix issue displaying missing action errors when --help is specified (…

…linode#662)

Co-authored-by: ykim-1 <ykim@akamai.com>

linodecli/__init__.py

@@ -230,4 +230,5 @@ def main():  # pylint: disable=too-many-branches,too-many-statements
         if parsed.help:
             print_help_action(cli, parsed.command, parsed.action)
             sys.exit(ExitCodes.SUCCESS)
+
         cli.handle_command(parsed.command, parsed.action, args)

linodecli/cli.py

@@ -208,7 +208,7 @@ def find_operation(self, command, action):
                 return op
 
         # Fail if no matching alias was found
-        raise ValueError(f"No action {action} for command {command}")
+        raise ValueError(f"Action not found for command {command}: {action}")
 
     @property
     def user_agent(self) -> str:

linodecli/exit_codes.py

@@ -20,3 +20,4 @@ class ExitCodes(IntEnum):
     KUBECONFIG_ERROR = 6
     ARGUMENT_ERROR = 7
     FILE_ERROR = 8
+    UNRECOGNIZED_ACTION = 9

linodecli/help_pages.py

@@ -15,9 +15,10 @@
 from rich.table import Column, Table
 from rich.text import Text
 
-from linodecli import plugins
 from linodecli.baked import OpenAPIOperation
 from linodecli.baked.request import OpenAPIRequestArg
+from linodecli.exit_codes import ExitCodes
+from linodecli.plugins import plugins
 
 HELP_ENV_VARS = {
     "LINODE_CLI_TOKEN": "A Linode Personal Access Token for the CLI to make requests with. "
@@ -181,8 +182,9 @@ def print_help_action(
     """
     try:
         op = cli.find_operation(command, action)
-    except ValueError:
-        return
+    except ValueError as exc:
+        print(exc, file=sys.stderr)
+        sys.exit(ExitCodes.UNRECOGNIZED_ACTION)
 
     console = Console(highlight=False)
 

tests/unit/test_cli.py

@@ -73,7 +73,7 @@ def test_find_operation(
         with pytest.raises(ValueError, match=r"Command not found: *"):
             mock_cli.find_operation("bad", "list")
 
-        with pytest.raises(ValueError, match=r"No action *"):
+        with pytest.raises(ValueError, match=r"Action not found for command *"):
             mock_cli.find_operation("foo", "cool")
             mock_cli.find_operation("cool", "cool")
 

tests/unit/test_help_pages.py

@@ -1,7 +1,11 @@
+import contextlib
 from io import StringIO
 from types import SimpleNamespace
 
-from linodecli import help_pages
+import pytest
+
+from linodecli import CLI, help_pages
+from linodecli.baked import OpenAPIOperation
 from tests.unit.conftest import assert_contains_ordered_substrings
 
 
@@ -100,7 +104,7 @@ def test_help_with_ops(self, capsys, mocked_config):
 
     def test_help_with_ops_with_plugins(self, capsys, mocker, mocked_config):
         mocker.patch(
-            "linodecli.arg_helpers.plugins.available",
+            "linodecli.help_pages.plugins.available",
             return_value=["testing.plugin"],
         )
         help_pages.print_help_plugins(mocked_config)
@@ -120,10 +124,28 @@ def test_help_topics(self, capsys):
             assert topic in captured.out
 
     # arg_helpers.print_help_action(cli, command, action)
-    def test_action_help_value_error(self, capsys, mock_cli):
-        help_pages.print_help_action(mock_cli, None, None)
-        captured = capsys.readouterr()
-        assert not captured.out
+    def test_action_help_value_error(
+        self, capsys, mock_cli: CLI, create_operation: OpenAPIOperation
+    ):
+        mock_cli.ops = {
+            "foo": {
+                "bar": create_operation,
+            }
+        }
+
+        stderr_buf = StringIO()
+
+        with pytest.raises(SystemExit), contextlib.redirect_stderr(stderr_buf):
+            help_pages.print_help_action(mock_cli, "fake", "fake")
+
+        assert "Command not found: fake" in stderr_buf.getvalue()
+
+        stderr_buf = StringIO()
+
+        with pytest.raises(SystemExit), contextlib.redirect_stderr(stderr_buf):
+            help_pages.print_help_action(mock_cli, "foo", "fake")
+
+        assert "Action not found for command foo: fake" in stderr_buf.getvalue()
 
     def test_action_help_post_method(self, capsys, mocker, mock_cli):
         mocked_ops = mocker.MagicMock()