Returning custom Exit Code from Iced application

[mayankjoshii]

I have a UI application written in iced, which performs various operation. To launch the UI I'm using run() method: UpdateDriver::run(Settings::default()) and currently this returns the exit code of type iced::Result, but I want the application to return custom exit code of type u8 based on the operation performed. Ex: 1(success), 2(failure), 3(reboot) etc.

I need help on how to do that.

Current WorkFlow

fn launch_ui_mode() -> iced::Result {
        UpdateDriver::run(Settings::default())
 }

Expectation:

fn launch_ui_mode() -> u8 {
        UpdateDriver::run(Settings::default())
 }

Main Function:

fn main() -> ExitCode {

    let retcode: u8;
    let exec_type = get_execution_mode();

    if exec_mode == UI{ 
        retcode = launch_ui_mode();  //This is iced::Result type, I need u8 type
    }
    else{
        retcode = launch_cli_mode();
    }

    return ExitCode::from(retcode);
}

My application runs in both CLI and UI mode, form CLI mode I'm directly returning the u8 type exit code, need to implement that for UI mode too.

So if something like this is not possible, what is the other way to return the exit-code from the UI. Should I add the global variable to store the exit code in UI part of code? Will it be safe?