Improve CLI usability, update help, and reach 100% test coverage

- Default CLI to show current task when no command is given
- Update CLI help message to reflect default behavior
- Add automated test for CLI default behavior
- Exclude setup.py from coverage measurement
- Achieve 100% test coverage on application code

Author: decodingchris

.coveragerc

@@ -5,6 +5,7 @@ omit =
     */test_*.py
     */__pycache__/*
     */site-packages/*
+    setup.py
 
 [report]
 exclude_lines =

main.py

@@ -151,8 +151,11 @@ def reopen_task(self, task_id: int) -> None:
 
 def main() -> None:
     """Handle CLI commands and execute appropriate actions."""
-    parser = argparse.ArgumentParser(description='TaskNow - Minimalist Task Manager')
-    subparsers = parser.add_subparsers(dest='command', required=True)
+    parser = argparse.ArgumentParser(
+        description='TaskNow - Minimalist Task Manager',
+        epilog='If no command is provided, defaults to showing the current task.'
+    )
+    subparsers = parser.add_subparsers(dest='command')
 
     # Show current task
     subparsers.add_parser('show', help='Show current task')
@@ -184,6 +187,8 @@ def main() -> None:
     edit_parser.add_argument('new_description', nargs='*', help='New task description')
 
     args = parser.parse_args()
+    if args.command is None:
+        args.command = 'show'
     manager = TaskManager()
 
     try:

test_main.py

@@ -350,4 +350,23 @@ def test_cli_exception_handling(capsys):
 
     captured = capsys.readouterr()
     combined_output = captured.out + captured.err
-    assert "Error: Simulated error" in combined_output
+    assert "Error: Simulated error" in combined_output
+
+
+def test_cli_default_to_show(capsys, tmp_path):
+    """Test CLI defaults to showing current task when no command is given."""
+    # Patch TASKS_FILE to use a temp file
+    temp_file = tmp_path / "tasks.json"
+    with patch('main.TASKS_FILE', str(temp_file)):
+        from main import TaskManager, main as cli_main
+
+        # Add a task so there is something to show
+        manager = TaskManager()
+        manager.add_task("Default show task")
+
+        # Simulate running CLI with no arguments
+        with patch('sys.argv', ['main.py']):
+            cli_main()
+
+        captured = capsys.readouterr()
+        assert "Current task: Default show task" in captured.out