Enhance Error Handling and User Feedback for External Commands in `services.github` Module

[tawada]

The presented Python application aims to automate issue handling on GitHub, integrating various functionalities such as issue generation, code modification from issues, and project documentation updates. After a thorough review of the codebase, a critical observation concerns the lack of error handling and user feedback for external command executions within the services.github module.

In specific, operations such as cloning, pulling repository data, and branch checkout commands rely on the exec_command function, which executes shell commands. However, the current implementation might not provide sufficient feedback or handling for scenarios where these commands fail due to reasons like network issues, authentication errors, or incorrect repository/branch names. For example:

def exec_command(
        repo: str,
        command: List[str],
        capture_output: bool = False
) -> Union[None, subprocess.CompletedProcess]:
    ...
    try:
        complete_process = subprocess.run(
            command,
            ...
            check=True,
        )
        return complete_process
    except subprocess.CalledProcessError as err:
        ...
        # Generic error handling or re-try logic
        return None

In this snippet, if a command fails, the function logs an error and returns None, but crucially, it doesn't re-throw exceptions or specifically handle different failure types (e.g., authentication vs. connection issues). Consequently, the calling functions may continue execution without a clear understanding that an essential operation failed, potentially leading to further errors down the line that are more difficult to diagnose.

Enhancing the exec_command function and related routines to include more nuanced error handling, possibly even introducing retries for recoverable errors, could substantially improve the robustness and usability of the application. Furthermore, adding user feedback mechanisms to communicate the nature of these errors more explicitly can enhance the overall user experience, enabling quicker resolution of issues related to external Git and GitHub operations.